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.

Nitrogen dioxide

EC / List no: 233-272-6 CAS no: 10102-44-0
Alert Threshold
400 ug/m3
Upper assessment threshold
140 ug/m3
Lower assessment threshold
100 ug/m3
Average limit
200 ug/m3
Tolerance margin
0 %
Protection of Human Health
Average sampling duration
1 hour
XI (Section B),XII (Section A),II (Section A2)
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

04 Limit value not to be exceeded more than 18 times a calendar year

05 Margin of tolerance: 50 % on 19 July 1999, decreasing on 1 January 2001 and every 12 months thereafter by equal annual percentages to reach 0 % by 1 January 2010

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

29 Alert thresholds: To be measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller

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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