Air pollution is monitored by the London boroughs within their own area. There are a number of different monitoring methods available, including passive diffusion tubes. These diffusion tubes are small, passive samplers which measure the concentration of nitrogen dioxide (NO2) in the air at a certain location, providing a monthly average measurement. The diffusion tubes supplement the existing network of...

According to the LAEI 2019, there are 160 Air Quality Focus Areas in London. The Focus Areas are locations that not only exceed the EU annual mean limit value for NO2 but are also locations with high human exposure. They were defined to address concerns raised by boroughs within their Local Air Quality Management (LAQM) review process and forecasted air pollution trends. This is not...

(Minor update on 07/11/2019, following feedback from Hillingdon. Hillingdon Pump Lane Focus Area has been included in the Hayes Focus Areas) According to the LAEI 2016, there are 183 Air Quality Focus Areas in London. The Focus Areas are locations that not only exceed the EU annual mean limit value for NO2 but are also locations with high human exposure. They were defined to address concerns...