Table 1.

Statistical descriptions of the main indicators.

	PM2.5	PM10	SO2	CO	NO2	O3
Unit	μg/m3	μg/m3	μg/m3	mg/m3	μg/m3	μg/m3
Mean	66.49	106.18	23.87	1.33	47.39	93.07
Std.	49.71	65.21	25.53	0.74	21.98	56.67
Min	13	38	6	0.6	19	10
Max	383	483	23	9	176	286