Smog alert for the weekend

The first summer smog alert of the year was issued yesterday as he Department of the Environment said many areas of England and Wales were likely to suffer poor air quality this weekend.

Poor ozone levels are forecast for England and Wales, while areas in south-west England and London may also experience poor nitrogen dioxide levels today and on Saturday, although "air quality is likely to improve on Sunday".

Air quality classified as "poor" means people with breathing problems, such as asthma or bronchitis, may feel a little uncomfortable. Sufferers are advised to consider increasing any treatment temporarily - and talk to their doctors about the options.