Table 3.

Air quality data of Beijing city in February 2014.

Date	PM2.5 (μg/m3)	PM10 (μg/m3)	CO (mg/m3)	NO2 (μg/m3)	SO2 (μg/m3)
02–01	135	146	1.99	57	51
02–02	63	93	1.19	30	18
02–03	5	31	0.30	8	4
02–04	26	39	0.62	21	19
02–05	87	101	1.58	48	52
02–06	119	131	2.08	65	67
02–07	94	60	1.45	51	34
02–08	72	43	1.27	38	23
02–09	8	15	0.45	17	15
02–10	23	27	0.74	37	25
02–11	100	114	2.09	78	58
02–12	111	115	2.15	77	53
02–13	190	176	2.85	84	74
02–14	265	295	3.11	94	73
02–15	387	443	3.75	107	102
02–16	296	204	3.18	87	79
02–17	104	50	2.03	71	65
02–18	70	84	1.13	61	37
02–19	66	74	1.23	61	34
02–20	161	171	2.16	78	43
02–21	257	284	2.67	103	77
02–22	262	299	3.32	101	99
02–23	212	248	3.61	92	128
02–24	259	327	4.74	119	133
02–25	353	390	5.29	121	75
02–26	315	250	3.70	105	80
02–27	15	22	0.43	22	12
02–28	77	102	1.50	71	32