Air quality: the UK's invisible health crisis | Caroline Lucas | Environment | guardian.co.uk
"Road traffic emissions are still the primary culprit, due to the quantity of particulate matter (PM10) and nitrogen dioxide (NO2) – and also due to the way in which traffic permeates our towns and cities. Pollution from vehicles is released directly into our streets at a low height level, where it has little opportunity to disperse before being inhaled by those who live and work in heavily populated urban areas."
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