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

dark brown  >47%

brown 45% - 47%

mid brown 43% - 45%

light brown 41% - 43%

pale brown 38% - 41%

very pale brown 35% - 38%

white <35%

Areas with the highest levels of particulates emissions in England are concentrated in eastern England, especially London extending into Essex and Kent, north into Suffolk, Norfolk, Cambridgeshire, Lincolnshire and Humberside. Areas with high levels of particulates emissions outside eastern England include Sandwell and Leicester.