Annual Pollution Maps
Modelled annual mean NO2 air pollution, based on measurements made during 2010.
Key: Annual mean NO2 air pollution for 2010, in microgrammes per metre cubed (ug/m3)
NO2 <16ug/m3 NO2 16-19 ug/m3 NO2 19-22 ug/m3 NO2 22-25 ug/m3 NO2 25-28 ug/m3 NO2 28-31 ug/m3 NO2 31-34 ug/m3 NO2 34-37 ug/m3 NO2 37-40 ug/m3 NO2 40-43 ug/m3 NO2 43-46 ug/m3 NO2 46-49 ug/m3 NO2 49-52 ug/m3 NO2 52-55 ug/m3 NO2 55-58 ug/m3 NO2 58-61 ug/m3 NO2 61-64 ug/m3 NO2 64-67 ug/m3 NO2 67-70 ug/m3 NO2 70-73 ug/m3 NO2 73-76 ug/m3 NO2 76-79 ug/m3 NO2 79-82 ug/m3 NO2 82-85 ug/m3 NO2 85-88 ug/m3 NO2 88-91 ug/m3 NO2 91-94 ug/m3 NO2 94-97 ug/m3 NO2 >97 ug/m3
<16 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 82 85 88 91 94 >97
Passes annual mean objective Fails annual mean objective
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What is an Annual Pollution Map?

This map shows the annual mean pollution for the chosen species during 2010 in detail across London. Zoom into the map for more detail and to see the annual mean concentration band. The maps also show which areas pass or fail the annual mean objective if there is one.

More Information

  • Why create a pollution map?

    Measurements from monitoring stations are only able to report air quality at that particular location. The annual map uses a detailed model to show a prediction of what air quality was like across the whole of Greater London.

  • Why do you show only four pollutants?

    The four pollutants chosen are ones which are known to have an effect on health within London and are able to be predicted with this model. Levels of carbon monoxide (CO) are now well below EU Limit Values and have not been mapped, However this pollutant remains important in the formation of O3 across the northern-hemisphere and indoors, exposure to CO from faulty heating and cooking appliances can be dangerous. Concentrations of sulphur dioxide (SO2) are too unpredictable to create a map using this method. Each pollutant has different sources and behaviour, so try selecting each pollutant in turn to get a full picture of air quality at your chosen location.

  • Why annual averages?

    Annual means give a good indication of the average level of a pollutant and long-term exposure. Increasingly evidence is pointing to long-term exposure to air pollution as being more important than exposure to short-term peaks. Where annual mean EU Limit Values exist for a pollutant, the map scale is shown such that areas above the Limit Value are shown as yellow through orange to red. Greatest concentrations of traffic pollutants are often predicted in the middle of road junctions or in the centre of busy roads where the public do not normally have access. These are not generally areas of relevant exposure for the assessment of EU Limit Values and UK air quality objectives.

  • Why 2010?

    We have chosen this year because it is the latest year for which an accurate model is available.