Table 2

Observation of cigarette smoking and PM_2.5 level (μg/m³) in restaurants and bars in five cities in China, July to September 2007

	Smoking not observed								Smoking observed
	n	ASD	Outdoor PM_2.5 level			Indoor PM_2.5 level			n	ASD	Outdoor PM_2.5 level			Indoor PM_2.5 level
	n	ASD	GM	Minimum	Maximum	GM	Minimum	Maximum	n	ASD	GM	Minimum	Maximum	GM	Minimum	Maximum
Beijing	23	0	101	41	234	131	45	662	62	0.9	134	45	377	275	54	1087
Wuhan	11	0	36	21	73	47	21	113	69	0.9	50	15	168	188	32	1424
Xi'an	25	0	184	120	317	196	58	523	56	1.5	193	32	309	404	165	1459
Kunming	16	0	29	19	44	40	16	206	63	1.1	33	12	105	110	14	1007
Guiyang	16	0	71	34	118	94	36	197	63	0.8	76	14	294	183	76	815
Total	91	0	79	19	317	99	16	662	313	1.0	77	12	377	208	14	1459

ASD, active smoker density, number of smokers per 100 m³; GM, geometric mean with unit of μg/m³.