2021 NO2 and PM Base Year Data

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The data files for NOx and NO2, originally published on 15th March 2023, have been republished on 8th February 2024. The re-publication corrected a processing error which caused an underestimate in the NOx emissions from taxis in central London.

The GIS shapefile of the results for the PCM 2021 base year NO2 concentrations for the modelled road links is available via the following link:

The annual mean NOx source apportionment for 2021 is available via the following link:

The annual mean PM10 and PM2.5 source apportionments for 2021 are available via the following links: