het ozo gezonde openbare vervoer
Citaat:
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The metro trains’ brakes and tyres are contributing to this “perfect pollution storm in a subterranean teacup”. Sometimes you can find between 70-120 micrograms of PM10 per m3 down there with peaks at 1,000 micrograms per m3 trapped in the station. In comparison, the average concentration of PM10 outside is around 25-30 micrograms per m3.
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