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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 · European Union

Parameter | Required proportion of valid data One hour values | 75 % (i.e. 45 minutes) Eight hours values | 75 % of values (i.e. 6 hours) Maximum daily 8-hour mean | 75 % of the hourly running eight hour averages (i.e. 18 eight hour averages per day) 24-hour values | 75 % of the hourly averages (i.e. at least 18 hour values) Annual mean | 90 % (1) of the one hour values or (if not available) 24-hour values over the year (1) The requirements for the calculation of annual mean do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation.

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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2015-09-18; changes after this date are not shown.