39Those considerations show that the REACH Regulation seeks to reserve the authorisation procedure to certain substances, identified as being of very high concern, not only on account of the seriousness of their dangerous effects on health or on the environment, but also having regard to other factors. The latter may include, apart from the probability that the serious effects of a substance may occur under the normal conditions of use of that substance, the difficulty of adequately assessing the risks posed by those substances when it is impossible to determine, with the necessary certainty, a derived no-effect level or a predicted no-effect concentration, or indeed the level of concern that those substances engender in the public, the number of persons affected, and the impact of those effects on the lives, and in particular, the professional lives, of the persons affected.
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