Upper exposure limit or “standard” | ||
---|---|---|
Pollutant | Concentration | Measured as |
Benzene | 5 ppb | Running annual mean |
1,3-Butadiene | 1 ppb | Running annual mean |
Carbon monoxide | 10 ppm (10 000 ppb) | Running 8 h mean |
Lead | 0.5 μg/m3 | Annual mean |
Nitrogen dioxide | 150 ppb | 1 h mean |
21 ppb | Annual mean | |
Ozone | 50 ppb | Running 8 h mean |
Fine particles (PM10) | 50 μg/m3 | Running 24 h mean |
Sulphur dioxide | 100 ppb | 15 min mean |