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.

Sulphur dioxide

EC / List no: 231-195-2 CAS no: 7446-09-5
Critical Level
20 ug/m3
Upper assessment threshold
12 ug/m3
Lower assessment threshold
8 ug/m3
Tolerance margin
0 %
Protection of vegetation
Average sampling duration
15 month
XIII,II (Section A1)
23 The averaging period referes to Calendar year and winter (1 October to 31 March)

27 The upper and lower assessment thresholds correspond to 60% and 40% respectively of winter critical level

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