China aims to cut concentrations of hazardous, small airborne particles known as PM2.5 by an average of 4 per cent year on year this winter in main cities where it is trying to tackle pollution, the environment ministry said on Friday.The Ministry of Ecology and Environment (MEE) said in a notice that it would also strive to reduce the number of smoggy days in the cities by an average of two.China’s 2021-22 winter campaign against pollution would focus on as many as 64 cities throughout the…

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