EU reference value | WHO AQGs | |
PM2.5 | 25 µg·m−3 annual mean | 10 µg·m−3 annual mean 25 µg·m−3 24-h mean |
PM10 | 40 µg·m−3 annual mean 50 µg·m−3 24-h mean (not to be exceeded on >35 days per year) | 20 µg·m−3 annual mean 50 µg·m−3 24-h mean |
NO2 | 40 µg·m−3 annual mean 200 µg·m−3 1-h mean | 40 µg·m−3 annual mean 200 µg·m−3 1-h mean |
O3 | 120 µg·m−3 8-h mean | 100 µg·m−3 8-h mean |
SO2 | 125 µg·m−3 24-h mean (not to be exceeded on >3 days per year) | 20 µg·m−3 24-h mean 500 µg·m−3 10-min mean |
BaP | 1 ng·m−3 annual mean |
PMx: particles with a 50% cut-off aerodynamic diameter of x µm; NO2: nitrogen dioxide; O3: ozone; SO2: sulfur dioxide; BaP: benzo[a]pyrene.