Appendix E: Summary of air quality objectives in England Table E.1 Air Quality Objectives in England – Air quality objective Pollutant Concentration Measured as 200 µg/m3 not to be exceeded more Nitrogen Dioxide 1-hour mean than 18 times a year (NO2) 40 µg/m3 Annual mean 50 µg/m3, not to be exceeded more Particulate Matter 24-hour mean than 35 times a year (PM10) 40 µg/m3 Annual mean 350 µg/m3, not to be exceeded more 1-hour mean than 24 times a year Sulphur Dioxide 125 µg/m3, not to be exceeded more 24-hour mean (SO2) than 3 times a year 266 µg/m3, not to be exceeded more 15-minute mean than 35 a year
Appendix E: Summary of air quality objectives in England Table E.1 – Air Quality Objectives in England Pollutant Air quality objective Concentration Measured as Nitrogen Dioxide (NO2) 200 µg/m3 not to be exceeded more than 18 times a year 1-hour mean 40 µg/m3 Annual mean Particulate Matter (PM10) 50 µg/m3, not to be exceeded more than 35 times a year 24-hour mean 40 µg/m3 Annual mean Sulphur Dioxide (SO2) 350 µg/m3, not to be exceeded more than 24 times a year 1-hour mean 125 µg/m3, not to be exceeded more than 3 times a year 24-hour mean 266 µg/m3, not to be exceeded more than 35 a year 15-minute mean