Record pollution levels recorded in London smog

In a severe air pollution episode reminiscent of the 1950s, London experienced the highest levels of nitrogen dioxide (NO2) on record last December. Vehicle emissions were to blame, according to Warren Spring Laboratory (WSL).

Details of the pollution episode on 12-15 December emerged at a symposium organised by the Royal Society of Chemistry in February. John Bower of WSL revealed that NO2 levels had peaked at 423 ppb, the highest urban concentration measured since records began in 1976.

An average of eight hours of "very poor" air quality, when NO2 levels exceeded 300ppb, and 72 hours of "poor" air quality, with NO2 concentrat

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