China’s Smog Keeps Clearing
China’s air quality improved again in 2018, with the average levels of a key pollutant dropping by 9.3% in the 338 cities included in data released Monday (link in Chinese) by the Ministry of Environment and Ecology.
One of the ways in which air pollution is measured is by the concentration of PM2.5 — hazardous particulate matter under 2.5 micrometers in width — given as micrograms per cubic meter. Major sources of PM2.5 include burning coal, emissions from heavy industry, and emissions from cars and trucks.
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