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Average NO2, SO2, benzene and particulates emissions concentration as a proportion of the national standard levels for each pollutant (2010)

dark brown  >36%

brown 27% - 36%

mid brown 24.2% - 27%

light brown 22.4% - 24.2%

pale brown 20.8% - 22.4%

very pale brown 18.2% - 20.8%

white <18.2%

Areas with the worst air quality in England are generally concentrated in the large metropolitan areas such as London and the Thames estuary, Birmingham, Leicester, Nottingham, Manchester, Hull, Southampton and Portsmouth.