Summary | Beijing's air quality sharply improved-
China.org.cnThe blue sky has continued, data from the top
environment authority showed on Thursday.The air quality index
stood at less than 100 on 80 percent of days in November.A year
earlier, just 43 percent of days had an air quality index below
100.Follow China.org.cn on Twitter and Facebook to join the ...
China.org.cnThe blue sky has continued, data from the top
environment authority showed on Thursday.The air quality index
stood at less than 100 on 80 percent of days in November.A year
earlier, just 43 percent of days had an air quality index below
100.Follow China.org.cn on Twitter and Facebook to join the ...
china.org.cn | 22 December 2017