污污污视频在线观看91,最新中文字幕免费福利,夫妻在线观看视频91,91亚洲精品伊人久久,蜜臀av手机在线观看,日本高清视频一区不卡,九九热三级视频在线观看,国产成人在线观看视频网,毛茸茸的亚洲丰满老女人

Beijing announced it will adopt the national V emissions standard, the tightest one in China, for diesel-powered vehicles this month, becoming the first city in China to adopt standards for both gasoline and diesel-powered vehicles.

It is projected that nitrogen oxide, or NOx, could drop by 40 percent in the city because of the plan. There are approximately 22,000 heavy diesel vehicles in Beijing, accounting for 50 percent of NOx and 90 percent of particulate matter in the city, two major polluters of Beijing's air.