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This map shows the annual mean pollution for the chosen species during 2008 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.
- 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 two pollutants?
The two 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 below those considered to be harmful to health, and emissions of sulphur dioxide (SO2) are too unpredictable to create a map using this method. We have not created a map for ozone (O3) because we do not currently have one that matches the ozone air quality objective.
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, but it can also be important to know the amount of time a pollutant is above a threshold value. This can be seen for the air quality objectives, some of which are for annual averages, but others are for the number of says (or hours) above a set value. A location passing an air quality objective is not necessarily safe, as the long term health affects of air quality appear to vary with total exposure rather than having a fixed level below which you there are no effects. 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 2008?
We have chosen this year because it is the latest year for which an accurate model is available.