免费精品AB,亚洲日韩性欧美中文字幕,鲁丝无码一区二区三区,精品久久久久久成人AV,看av免费毛片手机播放,精品国际久久久久999波多野,又黄又爽又刺激又色的视频,亚洲无线码一区二区三区在线观看

        Beijing sees improving air quality in April

        Source: Xinhua| 2019-05-23 19:34:01|Editor: Li Xia
        Video PlayerClose

        BEIJING, May 23 (Xinhua) -- The average concentration of PM2.5 in Beijing was 48 micrograms per cubic meter in April, the lowest since 2013, the Beijing Municipal Ecological Bureau announced Thursday.

        The capital city saw 20 good air quality days, and no heavy pollution days last month, with density of PM 2.5 dropping 10.5 percent year-on-year, the bureau said.

        The average concentration of PM2.5 in Beijing was 51 micrograms per cubic meter last year, down 12.1 percent year on year, according to the annual environment report published earlier this month.

        Beijing started to implement a three-year action plan to win the war against air pollution. It has taken actions to curb pollutants from diesel trucks, dust and volatile organic compounds.

        TOP STORIES
        EDITOR’S CHOICE
        MOST VIEWED
        EXPLORE XINHUANET
        010020070750000000000000011100001380834511