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

dark brown  >8.3%

brown 5.7% - 8.3%

mid brown 5.1% - 5.7%

light brown 4.5% - 5.1%

pale brown 4% - 4.5%

very pale brown 3.4% - 4%

white <3.4%

Areas with the highest levels of sulphur dioxide emissions in England include the north of England from Merseyside to Humberside incorporating the cities of Liverpool, Manchester, Leeds and Sheffield, Teesside, the West Midlands, the Thames estuary and area around the Solent.