2021 NO₂ and PM Base Year Data

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The data files for NO_x 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 NO_x 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:

• GIS Shapefile for 2021 NO₂ Base Year (ZIP 12.3MB)

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

• 2021 Base Year NO_x Source Apportionment (ZIP 4.86MB)

The annual mean PM₁₀ and PM_2.5 source apportionments for 2021 are available via the following links:

• 2021 Base Year PM₁₀ Source Apportionment (ZIP 8.23MB)
• 2021 Base Year PM_2.5 Source Apportionment (ZIP 7.9MB)