Increase in air particulates raises concerns: Ministry

The Ministry of Environment has instructed its municipal and provincial departments to take measures to control air quality, after some control stations showed that air quality levels have dropped. Of particular concern was the increase in particulate matter (PM10) and fine particulate matter (PM2.5), which have harmful effects on people’s health. ... 

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https://www.phnompenhpost.com/national/increase-air-particulates-raises-concerns-ministry