The Ministry of Environmental Protection placed Lanzhou 50th out of 86 locations around China (stats for October 22). Lanzhou is on page 3, but as the results are not ranked I copied and pasted into Excel and reordered them.
The cities ranked 25-80 all got a 'good' rating. However, given that Lanzhou is often criticized for its poor air quality, I thought it would be interesting to see which places came below it. Here is a selection of the most well-known (with their ranking in brackets):
Lanzhou (50)
Changsha (54)
Chongqing (55)
Xining (60)
Hohot (61)
Chengdu (67)
Hangzhou (70)
Urumqi (74)
Xi'an (78)
Beijing (81) Light pollution
Harbin (86) Light pollution
This is what Lanzhou looks like today: