From: Urban population exposure to air pollution in Europe over the last decades
Air pollutant | EU limit and target value (threshold in µg m−3) | WHO AQG (threshold in µg m−3) |
---|---|---|
PM10 a | Annual mean (40) | Annual mean (20) |
PM10 a | Number of exceedance of 24-h mean (50) | Number of exceedance of 24-h mean (50) |
PM2.5 b | Annual mean (25) | Annual mean (10) |
PM2.5 b | – | Number of exceedance of 24-h mean (25) |
O3 c | Number of exceedance of maximum daily 8-h mean (120) | Number of exceedance of maximum daily 8-h mean (100) |
NO2 d | Annual mean (40) | Annual mean (40) |
NO2 d | Number of exceedance of 1-h mean (200) | Number of exceedance of 1-h mean (200) |
SO2 e | Number of exceedance of 24-h mean (125) | Number of exceedance of 24-h mean (20) |
COf | Maximum daily 8-h (10,000) | Maximum daily 8-h (10,000) |