More action needed on UK's summer smogs, say experts

Data shows rise in ozone values over past few years, with many days breaching WHO guidelinesAugust's heatwave led to the UK's second major summer smog of the year. Air pollution across most of England and Wales reached between seven and eight on the government's 10-point scale.Summer smogs are caused by many pollutants that chemically react together in strong sunlight. There is no simple connection between a single pollution source and the air quality problem, making it hard to reduce and keep these smogs under control. Continue reading...