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Nitrogen dioxide emissions concentration as a proportion of the national standard level (2010)

dark brown  >70%

brown 53% - 70%

mid brown 46% - 53%

light brown 41% - 46%

pale brown 35% - 41%

very pale brown 29% - 35%

white <29%

Areas with the highest levels of nitrogen dioxide emissions in England are metropolitan areas such as London and the Thames estuary, the West Midlands, Leicester, Nottingham, Derby, Manchester, Liverpool and Newcastle upon Tyne.