Air Quality

Questions to the Mayor of London – answered on 18th May 2022.

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Photo of Nicholas Rogers Nicholas Rogers Conservative

Please can you provide the data held by the GLA Group on the PM2.5 levels for the A316 and the A4 through Hounslow between 2016-2021?

Photo of Sadiq Khan Sadiq Khan Mayor of London

There are two monitoring stations that measure particulate matter (PM2.5) on or near the A316 and A4 and have data for 2018 to 2021. They both recorded a significant reduction in annual average concentrations, of 25 and 31 per cent.

Based on data from the London Atmospheric Emission Inventory, the PM2.5­ concentration along the A4 in Hounslow 2016 was 13.6 micrograms per cubic meter, and this reduced to 11.4 micrograms per cubic meter in 2019, a reduction of 16 per cent. The average PM2.5 concentration along the A416 in Hounslow 2016 was 13.2 micrograms per cubic meter, and this reduced to 10.8 micrograms per cubic meter in 2019, a reduction of 18 per cent.

The data is available in the attached.