Table 3. Personal and Indoor PM_2.5 (μg/m³) Concentrations from Smoky Coal Burning Homes from Xuanwei and Fuyuan, by Coal Source.

			personal				indoor
county	smoky coal subtype	coal mine	Na	AMb	GMb	GSDb	N	AM	GM	GSD
Xuanwei	coking coal		119	189	153	2.0	122	196	149	2.0
		Azhi	34	227	181	1.9	33	186	160	1.7
		Baoshan	12	210	168	2.2	12	246	193	2.1
		Laibin	28	153	132	2.1	30	220	152	2.2
		Tangtang	31	194	152	2.0	33	191	133	2.3
		Yangchang	14	142	125	1.6	14	135	124	1.5
Fuyuan	overall		80	168	142c	1.8	88	169	138c	1.9
	coking coal		23	213	175d	1.9	27	188	154d	1.9
		Daping	9	111	104	1.5	10	87	83	1.4
		Enhong	9	241	208	1.8	11	250	222	1.7
		Haidan	5	348	329	1.4	6	242	221	1.7
	1/3 coking coal		13	183	165d	1.6	12	271	245	1.7
		Bagong	10	207	194	1.4	9	274	262	1.4
		Dahe	3	104	96	1.6	3	263	200	2.8
	gas fat coal		40	135	120d	1.6	39	117	107d	1.6
		Housuo	38	130	116	1.6	37	111	102	1.5
		Qingyun	2	237	237	1.0	2	236	235	1.1
	meager lean coal	Gumu	4	138	96	2.8	4	196	149	2.0

^aNumber of measurements is from households which exclusively burn smoky coal and report a coal source consistent with reported coal type.

^bAM = Arithmetic Mean, GM = Geometric Mean, GSD = Geometric Standard Deviation.

^cSignificant (p < 0.05) variation between smoky coal subtypes sourced in Fuyuan via ANOVA test.

^dSignificant (p < 0.05) variation between coal mines within identified smoky coal subtype via ANOVA test.