Traffic smog hits UK for second winter running

Traffic emissions pushed nitrogen dioxide levels to a record high in Manchester last December during a smog episode over the Midlands and northern England, according to a Warren Spring Laboratory (WSL) report.1

The highest level of NO2 measured in the UK was recorded during a four-day pollution episode in London in December 1991 (ENDS Report 205, pp 7-8 ). Traffic emissions, combined with stable anticyclonic weather, were the major cause.

The smog which affected Manchester and other northern cities betwee

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