# Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe, Division 3: Particulate matter (PM10/PM2,5)

Extent: E+W+S+N.I.

The upper assessment threshold and the lower assessment threshold for PM2,5 do not apply to the measurements to assess compliance with the PM2,5 exposure reduction target for the protection of human health.
24-hour average PM10
Annual average PM10
Annual average PM2,5
Upper assessment threshold
70 % of limit value (35 μg/m3, not to be exceeded more than 35 times in any calendar year)
70 % of limit value (28 μg/m3)
70 % of limit value (17 μg/m3)
Lower assessment threshold
50 % of limit value (25 μg/m3, not to be exceeded more than 35 times in any calendar year)
50 % of limit value (20 μg/m3)
50 % of limit value (12 μg/m3)

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Source: https://www.legislation.gov.uk/eudr/2008/50/annex/II/division/A/division/3 (the official version)
Page: https://openlegislation.uk/eu-directive-2008-50/annex-II/division-A/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.