Figure 2
From: Fine particulate matter (PM2.5) in China at a city level
The averaged PM2.5/PM10 ratio of the 190 cities of China, during the year of 2014/2015 (a) and during the spring (b), summer (c), autumn (d) and winter (e).
The maps were drawn by the software of Igor Pro, http://www.wavemetrics.com/.
