2.

Member States shall ensure that measuring stations to supply data on concentrations of PM2,5 are installed and operated. Each Member State shall choose the number and the siting of the stations at which PM2,5 is to be measured as representative of concentrations of PM2,5 within that Member State. Where possible sampling points for PM2,5 shall be co-located with sampling points for PM10. Within nine months of the end of each year Member States shall send the Commission the arithmetic mean, the median, the ninety-eighth percentile and the maximum concentration calculated from measurements of PM2,5 over any twenty-four hours within that year. The ninety-eighth percentile shall be calculated in accordance with the procedure laid down in Section 4 of Annex I to Council Decision 97/101/EC of 27 January 1997 establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States(6).

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.