Research Article
PM2.5/PM10 Ratios in Eight Economic Regions and Their Relationship with Meteorology in China
Figure 2
Temporal trends and spatial distribution of PM2.5/PM10 ratio. (a) 3-year average ratio with an increasing trend from northwest to southeast (regional background color) and the frequency distribution (bar chart). (b) Interannual variations with three categories (regional background color) and annual mean ratio (bar chart). (c) Seasonal variations with three types (regional background color) and seasonal mean ratio (bar chart). (d) Weekday-weekend variations with two types (regional background color) and corresponding mean ratio (bar chart). (e) Bar chart of mean ratio during heating periods (blue background meant no domestic heating).
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