News24.com | China says average national smog levels down 9.1% in 2021
2022-01-31 12:39
SHANGHAI, Jan 31 - Air pollution in 339 Chinese cities improved in 2021, with average concentrations of small, hazardous airborne particles known as PM2.5 down 9.1% from a year earlier to 30 micrograms per cubic metre, official data showed on Monday
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