Welcome to the Welsh Air Quality Data and Statistics Database. These pages contain options for you to retrieve data relating to Air Quality in Wales from the present day back to 1986.
The database contains tables of measured concentration data and statistics from the air quality monitoring sites operated by the National Assembly for Wales and other members of the Welsh Air Quality Forum. Estimates of emissions - the amount of pollution produced by a range of activities can be obtained from the National Atmospheric Emissions Inventory (NAEI)
Emissions and concentration statistics shown in this database are National Statistics. National Statistics are produced to high professional standards set out in the National Statistics Code of Practice. They undergo regular quality assurance reviews to ensure that they meet customer needs. They are produced free from any political interference. Further National Statistics are available at from Defra's Environment Protection Statistics and Information Management Division (EPSIM) at https://www.gov.uk/government/organisations/department-for-environment-food-rural-affairs/about/statistics