Addition of PM_2.5 into the National Ambient Air Quality Standards of China and the Contribution to Air Pollution Control: The Case Study of Wuhan, China

Table 4

Contribution of PM_2.5 to the nonattainment rates of the first 6 months of 2013.

Months	Overall nonattainment days	PM2.5 nonattainment; days	Contribution; rate
January	30	30	100%
February	21	21	100%
March	25	25	100%
April	10	10	100%
May	16	9	56.25%
June	10	8^a	80%
Total	102	103	91.96%

aOn 8 March 2013, both PM_2.5 and PM₁₀ are listed as the primary pollutants as they had the same index value.