Limit values are: PM10– 50 µg/m3 24-hour average not to be exceeded for more than 35 days; NO2 – 40 µg/m3 annual average; SO2 – 125 µg/m3 24-hour average not to be exceeded for more than four days; O3 – 120 µg/m3 8-hour daily maximum not to be exceeded for more than 25 days averaged over three years.

References and footnotes