The average density¹ of PM2.5 in Beijing from January to May was 58 micrograms per cubic meter, down 18.3 percent year on year, the Beijing Municipal Environmental Protection Bureau announced Thursday.

 

北京市环保局周四宣布，1月至5月北京PM2.5平均密度为58微克每立方米，年同比下降18.3%。

 

In May, the average reading of PM2.5, airborne particles measuring less than 2.5 microns, stood at 54 micrograms per cubic meter, up 8 percent from a year ago.

 

In the first five months, authorities fined the owners of more than 117,700 heavy-duty diesel² vehicles for excessive emissions³, twice the total number fined last year. In May, six construction sites were fined for failing to control dust.

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