In Beijing during 2001, 185 days, accounting for 50.7 percent of the year, were given a 'pollution rating' of "second grade" or "better than second grade". In Chongqing, a heavy industrial area of...
Please login first!
In Beijing during 2001, 185 days, accounting for 50.7 percent of the year, were given a 'pollution rating' of "second grade" or "better than second grade". In Chongqing, a heavy industrial area of...