ANNEX II Assessment thresholds

Pollutant

Assessment threshold (annual mean, unless specified)

PM2,5

5 μg/m3

PM10

15 μg/m3

Nitrogen dioxide (NO2)

10 μg/m3

Sulphur dioxide (SO2)

40 μg/m3 (24-hour mean)(1)

Benzene

1,7  μg/m3

Carbon monoxide (CO)

4 mg/m3 (24-hour mean)(1)

Lead (Pb)

0,25  μg/m3

Arsenic (As)

3,0 ng/m3

Cadmium (Cd)

2,5 ng/m3

Nickel (Ni)

10 ng/m3

Benzo(a)pyrene

0,30 ng/m3

Ozone (O3)

100 μg/m3 (maximum 8-hour mean) (1)

Pollutant

Assessment threshold (annual mean, unless specified)

Sulphur dioxide (SO2)

8 μg/m3 (average between 1 October and 31 March)

Oxides of nitrogen (NOx)

19,5 μg/m3