Air quality trends

We use several measures to show changes in PM10 and PM2.5 over time, from the number of high pollution events to the highest daily and annual average concentrations.

In some locations, the monitoring site has been moved which may affect the trends. More details about site locations can be found in the latest air quality environmental snapshot report (PDF File, 2.04MB).

High pollution events

Highest daily concentrations

Annual average concentrations