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

dark brown  >3.63%

brown 3.07% - 3.63%

mid brown 2.95% - 3.07%

light brown 2.71% - 2.95%

pale brown 2.43% - 2.71%

very pale brown 2.1% - 2.43%

white <2.1%

Areas with the highest levels of benzene emissions in England include South, West and East Yorkshire and Humberside, London, the Suffolk coast, the north Kent coast, the Black Country, and cities such as Stoke-on-Trent, Southampton, Portsmouth and Oxford.