- acceptable means of compliance (AMC)
means non-binding standards adopted by the Agency to illustrate means to establish compliance with Regulation (EC) No 216/2008 and its implementing rules;
- aerial work
means an aircraft operation in which an aircraft is used for specialised services such as agriculture, construction, photography, surveying, observation and patrol, search and rescue or aerial advertisement;
- aerodrome climatological summary
means a concise summary of specified meteorological elements at an aerodrome, based on statistical data;
- aerodrome climatological table
means a table providing statistical data on the observed occurrence of one or more meteorological elements at an aerodrome;
- aerodrome control tower
means a unit established to provide air traffic control service to aerodrome traffic;
- aerodrome elevation
means the elevation of the highest point of the landing area;
- aerodrome flight information service (AFIS)
means flight information service for aerodrome traffic provided by a designated air traffic services provider;
- aerodrome mapping data
means data collected for the purpose of compiling aerodrome mapping information;
- aerodrome mapping database (AMDB)
means a collection of aerodrome mapping data organised and arranged as a structured data set;
- aerodrome meteorological office
means an office responsible for providing meteorological service for an aerodrome;
- aerodrome traffic
means all traffic on the manoeuvring area of an aerodrome and all aircraft flying in the vicinity of an aerodrome.
- aerodrome traffic circuit
means the specified path to be flown by aircraft operating in the vicinity of an aerodrome;
- aerodrome warning
means information issued by an aerodrome meteorological office concerning the occurrence or expected occurrence of meteorological conditions which could adversely affect aircraft on the ground, including parked aircraft and the aerodrome facilities and services;
- aeronautical data
means a representation of aeronautical facts, concepts or instructions in a formalised manner suitable for communication, interpretation or processing;
- aeronautical database
means a collection of aeronautical data organised and arranged as a structured data set, stored electronically on systems, which is valid for a dedicated period and may be updated;
- aeronautical fixed service (AFS)
means a telecommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficient and economical operation of air services;
- aeronautical fixed station
means a station in the aeronautical fixed service;
- aeronautical fixed telecommunication network (AFTN)
means a worldwide system of aeronautical fixed circuits provided, as part of the AFS, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics;
- aeronautical ground light
means any light specially provided as an aid to air navigation, other than a light displayed on an aircraft;
- aeronautical information
means information resulting from the assembly, analysis and formatting of aeronautical data;
- aeronautical information circular (AIC)
means a notice containing information that does not qualify for the origination of a NOTAM or for inclusion in the aeronautical information publication, but which relates to flight safety, air navigation, technical, administrative or legislative matters;
- aeronautical information management (AIM)
means the dynamic, integrated management of aeronautical information through the provision and exchange of quality-assured digital aeronautical data in collaboration with all parties;
- aeronautical information product
means aeronautical data and aeronautical information provided either as digital data sets or as a standardised presentation in paper or electronic media.
- aeronautical information publication (AIP)
means a publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air navigation;
- aeronautical information regulation and control
(AIRAC) means a system aimed at advance notification, based on common effective dates, of circumstances that necessitate significant changes in operating practices;
- aeronautical meteorological station
means a station making observations and meteorological reports for use in air navigation;
- aeronautical mobile service
means a mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate;
- aeronautical station
means a land station in the aeronautical mobile service.
- aeronautical telecommunication station
means a station in a telecommunication service provided for any aeronautical purpose;
- air traffic advisory service
means a service provided within an airspace of defined dimensions, or a designated route (advisory airspace) to ensure separation, in so far as practical, between aircraft which are operating on instrument flight rules (IFR) flight plans;
- air traffic safety electronics personnel (ATSEP)
means any authorised personnel who are competent to operate, maintain, release from, and return into operations equipment of the functional system;
- air-ground communication
means two-way communication between aircraft and stations or locations on the surface of the earth;
- air-report
means a report from an aircraft in flight prepared in conformity with the requirements for position and operational and/or meteorological reporting;
- airborne collision avoidance system (ACAS)
means an aircraft system based on secondary surveillance radar (SSR) transponder signals which operates independently of ground-based equipment to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders’;
- aircraft
means any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth's surface;
- aircraft identification
means a group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the aircraft call sign to be used in air-ground communications, and which is used to identify the aircraft in ground-ground air traffic service communications;
- AIRMET
means information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of low-level aircraft operations and of the development of those phenomena in time and space, and which was not already included in the forecast issued for low-level flights in the flight information region concerned or sub-area thereof;
- alert phase
means a situation wherein apprehension exists as to the safety of an aircraft and its occupants;
- alerting service
means a service provided to notify appropriate organisations regarding aircraft in need of search and rescue aid, and assist such organisations as required;
- alternate aerodrome
means an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing where the necessary services and facilities are available, where aircraft performance requirements can be met and which is operational at the expected time of use;
- alternative means of compliance (AltMOC)
means those means of compliance that propose an alternative to an existing AMC or those that propose new means to establish compliance with Regulation (EC) No 216/2008 and its Implementing Rules for which no associated AMC have been adopted by the Agency;
- altitude
means the vertical distance of a level, a point, or an object considered as a point, measured from mean sea level;
- ancillary activities
means, for the purposes of point ATM/ANS.OR.B.015 of Annex III, activities that support or enable the provision of ATM/ANS and:
- approach control unit
means a unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes;
- approach procedure with vertical guidance (APV)
means a performance-based navigation (PBN) instrument approach procedure designed for 3D instrument approach operations Type A.
- area control centre (ACC)
means a unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction;
- area forecast for low-level flights
means a forecast of weather phenomena for a flight information region or sub-area thereof, issued to cover the layer below flight level 100 (or below flight level 150 in mountainous areas, or higher, where necessary);
- area navigation (RNAV)
means a method of navigation which permits aircraft operation on any desired flight path within the coverage of ground- or space-based navigation aids or within the limits of the capability of self-contained aids, or a combination of them;
- area navigation route
means an ATS route established for the use of aircraft capable of employing area navigation;
- argument
means a claim that is supported via inferences by a body of evidence;
- ASHTAM
means a special series of NOTAM notifying by means of a specific format of a change in the activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations;
- assemble
means a process of merging data from multiple sources into a database and establishing a baseline for subsequent processing;
- audit
means a systematic, independent and documented process for obtaining evidence and evaluating it objectively to determine the extent to which requirements are complied with;
- authoritative source
means:
- automatic dependent surveillance – broadcast (ADS-B)
means a means by which aircraft, aerodrome vehicles and other objects can automatically transmit or receive, or transmit and receive data such as identification, position and additional data, as appropriate, in a broadcast mode via a data link;
- automatic dependent surveillance – contract (ADS-C)
means a means by which the terms of an ADS-C agreement will be exchanged between the ground system and the aircraft, via a data link, specifying under what conditions ADS-C reports would be initiated, and what data would be contained in the reports;
- automatic observing system
means an observing system that measures, derives and reports all required elements without human interaction;
- automatic terminal information service (ATIS)
means the automatic provision of current, routine information to arriving and departing aircraft throughout 24 hours a day or a specified portion thereof;
- aviation undertaking
means an entity, person or organisation, other than the service providers regulated by this Regulation, that is affected by or affects a service delivered by a service provider;
- boundary
means a lateral or vertical plane delineating the airspace in which an ATC unit provides air traffic services;
- break
means a period of time within the duty period when an air traffic controller is not required to perform duties, for recuperation purposes;
- broadcast
means a transmission of information relating to air navigation that is not addressed to a specific station or stations;
- ceiling
means the height above the ground or water of the base of the lowest layer of cloud below 6000 m (20000 ft) covering more than half of the sky;
- certified aircraft application
means a software application approved by the Agency as part of aircraft subject to Article 4 of Regulation (EC) No 216/2008;
- clearance limit
means the point to which an aircraft is granted an ATC clearance;
- cloud base
means the height of the base of the lowest observed or forecast cloud element in the vicinity of an aerodrome or operating site or within a specified area of operations, normally measured above aerodrome elevation or, in the case of offshore operations, above mean sea level;
- cloud of operational significance
means a cloud with the height of cloud base below 5000 ft or below the highest minimum sector altitude, whichever is greater, or a cumulonimbus cloud or a towering cumulus cloud at any height;
- commercial air transport
means any aircraft operation involving the transport of passengers, cargo or mail for remuneration or other valuable consideration;
- common information service
means a service consisting in dissemination of static and dynamic data to enable the provision of U-space services for the management of traffic of unmanned aircraft;
- completeness
means, in relation to data, the degree of confidence that all data needed to support the intended use is provided;
- conference communications
means communication facilities whereby direct speech conversation may be conducted between three or more locations simultaneously;
- confidence level
means the probability that the true value of a parameter is within a certain interval around the estimate of its value;
- control area
means a controlled airspace extending upwards from a specified limit above the earth;
- control zone
means a controlled airspace extending upwards from the surface of the Earth to a specified upper limit;
- controlled aerodrome
means an aerodrome at which air traffic control service is provided to aerodrome traffic;
- controlled airspace
means an airspace of defined dimensions within which air traffic control service is provided in accordance with the airspace classification;
- controlled flight
means any flight which is subject to an ATC clearance;
- controller-pilot data link communications (CPDLC)
means a means of communication between air traffic controller and pilot, using data link for ATC communications;
- conventional navigation route
means an ATS route established by reference to ground navigation aids;
- coordination data
means data of interest to operational staff in connection with the process of notification, coordination and transfer of flights, and with the process of civil-military coordination;
- coordination point
(COP) means a point on or adjacent to the boundary used by the ATC units and referred to in coordination processes;
- critical area
means an area of defined dimensions extending around the ground equipment of a precision instrument approach within which the presence of vehicles or aircraft will cause unacceptable disturbance of the guidance signals;
- critical incident stress
means the manifestation of unusual and/or extreme emotional, physical and/or behavioural reactions of an individual following an event or incident;
- cruising level
means a level maintained during a significant portion of a flight;
- cyclic redundancy check (CRC)
means a mathematical algorithm applied to the digital expression of data that provides a level of assurance against loss or alteration of data;
- danger area
means an airspace of defined dimensions within which activities dangerous to the flight of aircraft may exist at specified times;
- data accuracy
means a degree of conformance between the estimated or measured value and the true value;
- data collection surface
means a defined surface intended for the purpose of collecting obstacle or terrain data;
- data integrity
means a degree of assurance that aeronautical data and its value has not been lost or altered since the data origination or authorised amendment;
- data item
means a single attribute of a complete data set, which is allocated a value that defines its current status;
- data link communications
means a form of communication intended for the exchange of messages via a data link;
- data link service
means a set of related air traffic management transactions, supported by air-ground data link communications, which have a clearly defined operational goal and begin and end on an operational event;
- data link-automatic terminal information service (D-ATIS)
means the provision of ATIS via data link;
- data link-VOLMET (D-VOLMET)
means the provision of aerodrome routine meteorological report (METAR), aerodrome special meteorological report (SPECI), TAF, SIGMET, special air-reports not covered by a SIGMET and, where available, AIRMET via data link;
- data origination
means the creation of a new data item with its associated value, the modification of the value of an existing data item or the deletion of an existing data item;
- data product specification
means a detailed description of a data set or a collection of data sets together with additional information that will enable it to be created, supplied to and used by another party;
- data quality
means a degree or level of confidence that the provided data meets the user's data requirements in terms of accuracy, resolution, integrity (or equivalent assurance level), traceability, timeliness, completeness, and format;
- data quality requirements (DQRs)
means a specification of the characteristics of data (i.e. accuracy, resolution, integrity (or equivalent assurance level), traceability, timeliness, completeness and format) to ensure that the data is compatible with its intended use;
- data services provider (DAT provider)
means an organisation, which is:
- data set
means an identifiable collection of data;
- datum
means any quantity or set of quantities that may serve as a reference or basis for the calculation of other quantities;
- destination alternate
means an alternate aerodrome at which an aircraft would be able to land should it become either impossible or inadvisable to land at the aerodrome of intended landing;
- distress phase
means a situation wherein there is reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger or require immediate assistance;
- downstream clearance
means a clearance issued to an aircraft by an air traffic control unit that is not the current controlling authority of that aircraft;
- duty
means any task that an air traffic controller is required to perform by the air traffic control service provider;
- duty period
means a period which starts when an air traffic controller is required by the air traffic control service provider to report for or be available for or to commence duty and ends when the air traffic controller is free from duty;
- dynamic airspace reconfiguration
means the temporary modification of the U-space airspace in order to accommodate short-term changes in manned traffic demand, by adjusting the geographical limits of that U-space airspace;
- elevation
means the vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level;
- eligible interrogator code
means any code among the II codes and the SI codes, except:
- eligible Mode S interrogator
means a Mode S interrogator for which at least one of the following conditions is satisfied:
- en-route alternate
means an alternate aerodrome at which an aircraft would be able to land in the event that a diversion becomes necessary while en-route;
- essential local traffic
means any aircraft, vehicle or personnel on or near the manoeuvring area, or traffic in the take-off and climb-out area or the final approach area, which may constitute a hazard to the aircraft concerned;
- essential traffic
means controlled traffic to which the provision of separation by air traffic control service is applicable, but which, in relation to a particular controlled flight is not, or will not be, separated from other controlled traffic by the appropriate separation minimum;
- estimate data
means the coordination point, the estimated time of an aircraft and the expected flight level of the aircraft at the coordination point;
- estimated time of arrival
means:
- fatigue
means a physiological state of reduced mental or physical performance capability resulting from sleep loss or extended wakefulness, circadian phase or workload (mental or physical activity, or both) that can impair an individual's alertness and ability to safely perform his/her tasks;
- feature
means an abstraction of real world phenomena;
- feature attribute
means a characteristic of a feature that has a name, a data type and a value domain associated with it;
- feature type
means a class of real world phenomena with common properties, which forms the basic level of classification in a feature catalogue;
- final approach
means that part of an instrument approach procedure which:
- flight documentation
means documents, including charts or forms, containing meteorological information for a flight;
- flight information centre (FIC)
means a unit established to provide flight information service and alerting service;
- flight information region (FIR)
means an airspace of defined dimensions within which flight information service and alerting service are provided;
- flight information zone
means an airspace of defined dimension within which aerodrome flight information service and alerting service for aerodrome traffic are provided;
- flight level (FL)
means a surface of constant atmospheric pressure which is related to a specific pressure datum, 1013,2 hectopascals (hPa), and is separated from other such surfaces by specific pressure intervals;
- flight plan
means specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft;
- flight procedure
means a set of predetermined flight manoeuvres intended to be followed by a pilot, published by electronic, printed or digital means, or both.
- flight procedure design services
means services for the design, documentation, validation, maintenance and periodic review of flight procedures necessary for the safety, regularity and efficiency of air navigation;
- flight procedure designer
means a qualified person who performs design, documentation, validation, continuous maintenance, and periodic review of flight procedures;
- flight test
means a flight for the development phase of a new design (aircraft, propulsion systems, parts and appliances), a flight to demonstrate compliance to certification basis or to type design for aircraft coming from the production line, a flight intended to experiment new design concepts, requiring unconventional manoeuvres or profiles for which it could be possible to exit the already approved envelope of the aircraft or a training flight to perform either of those flights;
- flight visibility
means the visibility forward from the cockpit of an aircraft in flight;
- forecast
means a statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace;
- forecast for take-off
means a forecast for a specified period of time, prepared by an aerodrome meteorological office, which contains information on expected conditions over the runways complex in regard to surface wind direction and speed and any variations thereof, temperature, pressure (QNH) and any other element as agreed locally;
- format
means, in relation to data, a structure of data items, records and files arranged to meet standards, specifications or data quality requirements;
- functional system
means a combination of procedures, human resources and equipment, including hardware and software, organised to perform a function within the context of ATM/ANS and other ATM network functions;
- general aviation
means any civil aircraft operation other than aerial work or commercial air transport;
- Geography Markup Language (GML)
means an encoding standard of the Open Geospatial Consortium (OGC);
- geoid
means the equipotential surface in the gravity field of the Earth which coincides with the undisturbed mean sea level (MSL) extended continuously through the continents;
- geoid undulation
means the distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid;
- glide path
means a descent profile determined for vertical guidance during a final approach;
- grid point data in digital form
means computer-processed meteorological data for a set of regularly spaced points on a chart, for transmission from a meteorological computer to another computer in a code form suitable for automated use;
- gridded global forecasts
means forecasts of expected values of meteorological elements on a global grid with a defined vertical and horizontal resolution;
- ground visibility
means the visibility at an aerodrome, as reported by an accredited observer or by automatic systems;
- guidance material
means non-binding material developed by the Agency that helps to illustrate the meaning of a requirement or specification and is used to support the interpretation of Regulation (EC) No 216/2008, its implementing rules and AMC;
- harmful interference
means interference that prevents the performance requirements from being achieved;
- hazard
means any condition, event, or circumstance which could induce a harmful effect;
- heading
means the direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from North (true, magnetic, compass or grid);
- height
means the vertical distance of a level, a point or an object considered as a point, measured from a specified datum;
- heliport
means an aerodrome or a defined area on a structure intended to be used wholly or in part for the arrival, departure and surface movement of helicopters;
- holding fix
means a geographical location that serves as a reference for a holding procedure;
- holding procedure
means a predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance;
- identification
means the situation which exists when the position indication of a particular aircraft is seen on a situation display and positively identified;
- implementation sequence
means the time-bounded sequence of implementation of interrogator code allocations with which Mode S operators need to comply to avoid temporary interrogator code conflicts;
- instrument approach operations
means an approach and landing using instruments for navigation guidance based on an instrument approach procedure.
- instrument approach procedure (IAP)
means a series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply.
- instrument meteorological conditions (IMC)
means meteorological conditions expressed in terms of visibility, distance from cloud, and ceiling, less than the minima specified for visual meteorological conditions;
- integrity classification
means, in relation to aeronautical data, a classification based upon the potential risk resulting from the use of corrupted data, defining routine, essential and critical data;
- international NOTAM office (NOF)
means an office designated by a Member State for the exchange of NOTAM internationally;
- interrogator code allocation plan
means the most recently approved complete set of interrogator code allocations.
- local routine report
means a meteorological report issued at fixed time intervals, intended only for dissemination at the aerodrome of origin where the observations were made;
- local special report
means a meteorological report issued in accordance with the criteria established for special observations, intended only for dissemination at the aerodrome of origin where the observations were made;
- low-visibility operations (LVOs)
means approach or take-off operations on a runway with a runway visual range (RVR) of less than 550 m or with a decision height (DH) of less than 200 ft;
- low-visibility procedures
means procedures applied at an aerodrome for the purpose of ensuring safety during low-visibility operations;
- manoeuvring area
means that part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, excluding aprons;
- metadata
means data about data;
- meteorological bulletin
means a text comprising meteorological information preceded by an appropriate heading;
- meteorological information
means meteorological report, analysis, forecast, and any other statement relating to existing or expected meteorological conditions;
- meteorological observation
means the measurement and/or evaluation of one or more meteorological elements;
- meteorological report
means a statement of observed meteorological conditions related to a specified time and location;
- meteorological satellite
means an artificial Earth satellite making meteorological observations and transmitting these observations to Earth;
- meteorological watch office (MWO)
means an office monitoring meteorological conditions affecting flight operations and providing information concerning the occurrence or expected occurrence of specified en-route weather and other phenomena in the atmosphere which may affect the safety of aircraft operations within its specified area of responsibility;
- minimum sector altitude (MSA)
means the lowest altitude which may be used which will provide a minimum clearance of 300 m (1000 ft) above all objects located in an area contained within a sector of a circle of 46 km (25 NM) radius centred on a significant point, the aerodrome reference point (ARP) or the heliport reference point (HRP);
- Mode S interrogator
means a system, composed of antenna and electronics, which supports the addressing of individual aircraft through the Mode Select (‘Mode S’);
- Mode S operator
means a person, organisation or enterprise that operates or offers to operate a Mode S interrogator, including:
- mode Secondary Surveillance Radar (SSR)
means the conventional identifier related to specific functions of the interrogation signals transmitted by an SSR interrogator.
- movement area
means that part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, consisting of the manoeuvring area and the apron;
- movements
means, in a given year, the average over the previous three years of the total number of take-offs and landings.
- navigation aid
means a facility or system external to the aircraft, which generates electro-magnetic signals to be used by aircraft navigation systems for position determination or flight path guidance;
- near-parallel runways
means non-intersecting runways whose extended centre lines have an angle of convergence/divergence of 15 degrees or less;
- Network Manager
means the body entrusted with the tasks necessary for the execution of the functions referred to in Article 6 of Regulation (EC) No 551/2004;
- non-precision approach (NPA) procedure
means an instrument approach procedure designed for 2D instrument approach operations Type A.
- NOTAM
means a notice distributed by means of telecommunication containing information concerning the establishment, condition, or change in any aeronautical facility, service, procedure, or hazard, the timely knowledge of which is essential to personnel concerned with flight operations;
- notified unit
means the ATC unit that has received the notification information;
- obstacle
means all fixed (whether temporary or permanent) and mobile objects, or parts thereof, that:
- operation with operational credits
means an operation using specific aircraft or ground equipment, or a combination of aircraft and ground equipment which allows any of the following elements:
- OPMET
means operational meteorological information for use in preparatory or in-flight planning of flight operations;
- pan-European service
means an activity which is designed and established for users within most or all Member States and which may also extend beyond the airspace of the territory to which the Treaty applies;
- pilot-in-command
means the pilot designated by the operator, or in the case of General Aviation, the owner, as being in command and charged with the safe conduct of a flight;
- position
means, in a geographical context, a set of coordinates (latitude and longitude) referenced to the mathematical reference ellipsoid, which define the position of a point on the surface of the Earth;
- position indication
means the visual indication, in non-symbolic or symbolic form, or both, on a situation display, of the position of an aircraft, aerodrome vehicle or other object;
- pre-eruption volcanic activity
means an unusual and/or increasing volcanic activity which could presage a volcanic eruption;
- precision approach (PA) procedure
means an instrument approach procedure based on navigation systems (ILS, MLS, GLS and SBAS Cat I) designed for 3D instrument approach operations Type A or B;]
- pressure-altitude
means an atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the Standard Atmosphere;
- prevailing visibility
means the greatest visibility value, observed in accordance with the definition of ‘visibility’, which is reached within at least half the horizon circle or within at least half of the surface of the aerodrome.
- primary radar
means a radar system which uses reflected radio signals;
- printed communications
means communications which automatically provide a permanent printed record at each terminal of a circuit of all messages which pass over such circuit;
- problematic use of psychoactive substances
means the use of one or more psychoactive substances by an individual, in a way that:
- prognostic chart
means a forecast of (a) specified meteorological element(s) for a specified time or period and a specified surface or portion of airspace, depicted graphically on a chart;
- prohibited area
means an airspace of defined dimensions, above the land areas or territorial waters of a Member State, within which the flight of aircraft is prohibited;
- psychoactive substances
means alcohol, opioids, cannabinoids, sedatives and hypnotics, cocaine, other psychostimulants, hallucinogens, and volatile solvents, whereas caffeine and tobacco are excluded;