London’s air quality is getting better, not worse

Do you think London’s air quality is better or worse than 20 years ago? Most people would answer “worse”, but they would be wrong. London’s air quality, though bad, has been getting steadily better. The average concentration of particles 10 microns or smaller (known as PM10) is about 20 per cent less than it was 20 years ago and the average concentration of nitrogen dioxide is 30 per cent less.

Matt Ridley

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