Last updated: 18:00 on Thursday 21st November 2019
Number of monitoring sites in each pollution index. Values are based on the pollution level measured for the latest hour and are provisional.
Air Quality in Wales
This website provides information on air quality in Wales. This includes data from the regions monitoring sites, and information on related air quality issues.
Nearby building work may occasionally have caused unrepresentative high levels at the Cardiff Centre monitoring site since 1st July 2019. The situation will continue until further notice. Please note the data are provisional and subject to a ratification process which ensures the data quality meets statutory reporting requirements.