(12)As set out in a note for guidancenote presented to the competent authorities of the Member States for the implementation of Regulation (EU) No 528/2021 in June 2021, the Commission considers that, for reasons of coherence with the approach followed for the technical equivalence assessment with regard to PBT and/or vPvB properties of impurities under Regulation (EU) No 528/2012 and for determining whether constituents, impurities and additives are relevant for the PBT/vPvB assessment under Regulation (EC) No 1907/2006, the same concentration limit of 0,1 % (w/w) should be applied to determine whether a substance identified as having PBT and/or vPvB properties in accordance with Annex XIII to Regulation (EC) No 1907/2006 and contained in a biocidal product, is a substance of concern. This implies that a substance identified as having PBT and/or vPvB properties and contained in a biocidal product should be considered as substance of concern if its concentration is higher than or equal to 0,1 % (w/w) in the biocidal product. Where the biocidal product contains multiple substances identified as having PBT and/or vPvB properties in individual amounts of less than 0,1 % (w/w), the concentration limit should be considered to apply for the group of substances. The competent authorities agreed with the Commission’s position.