Air pollution is monitored by the London boroughs within their own area. There are a number of different monitoring methods available, including diffusion tubes. Nitrogen dioxide diffusion tubes are small, passive samplers which measure the concentration of nitrogen dioxide in the air at a certain location, providing a monthly average measurement. The diffusion tubes supplement the network of more accurate reference analysers across Lon...

To help clear London's air and improve public health, the Ultra Low Emission Zone (ULEZ) is expanding across all London boroughs from 29 August 2023. The current ULEZ covers inner London up to (but not including) the North and South Circular Roads. The new boundary will be the same as the existing London-wide Low Emission Zone. For more information on the ULEZ expansion please visit: https://tfl.gov.uk/modes/driving/ultra-low-e...