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 2

City-wide 24-hour average PM_2.5 concentrations from 1 January to 30 June 2013.

Attainment; status	Grades	Brackets of 24-hour average PM2.5 concentration	Number; of days	Percentage	Attainment and nonattainment rate
Attainment	I	[0, 35)	7	3.87%	25.97%
	II	[35, 75)	40	22.10%
Nonattainment	III	[75, 115)	53	29.28%	74.03%
	IV	[115, 150)	26	14.36%
	V	[150, 250)	36	19.89%
	VI	[250, 350)	16	8.84%
		[350, 500)	3	1.66%
		[500, +∞)	0	0.00%
Total	—	—	181	100%	100%