Introduction

This is a monthly summary report to provide rolling annual mean concentrations for NO2, PM10 and PM2.5 across all sites in the London Borough of Hounslow air quality monitoring network. The information indicates whether measured levels are increasing or decreasing, with respect to the previous month.

Note - the concentrations provided in this report include provisional data, and are subject to change.

Monthly average plot

Figure 1 below show the average rolling annual mean of NO2, PM10 and PM2.5 across all sites, calculated based on the preceeding 12 months.

Figure 1: 12-month rolling mean averages across all sites in the Hounslow London Borough Council

Figure 1: 12-month rolling mean averages across all sites in the Hounslow London Borough Council

Summary statistics

The table below provides the changes in concentration for the most recent complete month, when compared to its previous month for NO2, PM10 and PM2.5. The concentrations for May 2022 are coloured according to whether these values have gone up, down, or remained the same, with respect to the previous month.

Pollutant Apr 2022 May 2022
1 PM10 18.4 18.7
3 PM2.5 10.4 10.6
2 NO2 30.0 29.3