The Mayor of London has published Supplementary Planning Guidance on sustainable design and construction.
This includes a requirement that new developments in London are air quality neutral. All major new developments, taken to be 10 or more dwellings or 1,000sq metres or more floor space for all other developments, will have to calculate the building and transport emissions and compare these with a benchmark for development.
The calculations cover the emissions of nitrogen oxides and PM10. The guidance also sets emission limits for boilers and centralised energy plant.
They should take into account the effects (including cumulative effects) of pollution on health and the natural environment or general amenity. They also need to consider the potential sensitivity of the area or proposed development to adverse effects from pollution.