The GLA predicts pollution levels in London using a model that estimates how pollution will be dispersed over time and distance from where it is emitted. The pollutants modelled for the Mayor’s Air Quality Strategy are nitrogen dioxide (NO2) and particulate matter (PM10 and PM2.5) as these are often linked with negative health impacts. The EU has also set target levels for these pollutants across Europe that must be achieved by each member state.
The GLA compiles the London Atmospheric Emission Inventory (LAEI) on a yearly basis. This database provides information on emissions from all identifiable pollution sources in Greater London. The current LAEI includes emissions data for the ‘base year’ 2008 and projections for years 2011 and 2015. It is distributed to the London boroughs for free. The Mayor will continue to improve the inventory so that boroughs and other organisations can access accurate emissions data to help develop effective policies.