Publication of the statistical release on Air Quality Statistics in the UK, 1987 to 2011: provisional results
Defra has published provisional figures for annual UK air quality up to 2011.
Showing average concentrations of particulates and ozone - the two pollutants thought to have the greatest health impacts. The statistics also report the average number of days when pollution was moderate or higher.
Full statistical release can be found at: Air quality statistics in the UK, 1987 to 2011 - Provisional