The data for China show that from the late 1990s, average annual PM 2.5 exposure in the country rose from 35 to more than 50 micrograms per cubic metre, before levelling out around 2006 at between 50 and 60 1. The university’s Atmospheric Composition Analysis Group, which Li is part of, monitors various pollutants and estimates their global health impacts. Fine particulate matter with a diameter of 2.5 micrometres or less - referred to as PM 2.5 - is the most concerning air pollutant, says Li. LouisĮach year, air pollution is responsible for more than four million premature deaths globally - including an estimated one million in China - primarily from heart disease, lung cancer and respiratory illnesses. Source: Atmospheric Composition Analysis Group, Washington University of St. Louis in Missouri, owing to technological solutions and ambitious policies. The speed at which China has reduced its air pollution has been “impressive”, says Chi Li, an atmospheric scientist at Washington University of St. But researchers say that there is still a long way to go to clean China’s air and protect the health of its citizens.
Over the past decade, China’s once-pollution-choked skies have steadily improved, according to more than two decades of atmospheric measurements taken by NASA satellites. Parts of China continue to be affected by heavy smog.
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