Annexes II VII XI XII XIII XIV - Assessment Thresholds & Limit Values

This list contains the Limit, Critical, Target and Long-term Values on ambient air for protection of human health and vegetation. It also contains the Alert, Information and Upper and Lower Assessment thresholds for sulphur dioxide, nitrogen dioxide, benzene, carbon monoxide, lead, PM2.5, PM10 and ozone.


EC / List no: 200-753-7 CAS no: 71-43-2
Upper assessment threshold
3.5 ug/m3
Lower assessment threshold
2 ug/m3
Average limit
5 ug/m3
Tolerance margin
0 %
Protection of Human Health
Average sampling duration
1 year
XI (Section B),II (Section A5)
01 Without prejudice to Annex I, the criteria for 'Required proportion of valid data' shall be used for checking validity when aggregating data and calculating statistical parameters

06 Margin of tolerance: 5 µg/m3 (100 %) on 13 December 2000, decreasing on 1 January 2006 and every 12 months thereafter by 1 µg/m3 to reach 0 % by 1 January 2010

08 Date by which limit value is to be met: 1 January 2010

09 'Year' in Averaging period referes to 'calendar year'

22 The required proportion of valid data for the Limit Value refers to the one hour values or (if not available) 24-hour values over the year

15 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

30 Average Limit is the Limit Value, a level fixed with the aim of avoiding, preventing or reducing harmful effects on human health and/or the environment and not to be exceeded once attained

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