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CleanTechnica
Feb 23, 2017, 6:54 am81 ptsLondon's air pollution problems seem to growing rapidly in recent years (or perhaps we should say they are returning, depending on how you think of it). Hourly PM2.5 levels now sometimes exceeding those of Beijing, China. Nitrogen dioxide (NOx) levels have been surging well beyond EU legal limits (over a 5 day…
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