Table 1.

Calculated PAH isomer ratios based on the measured EFs for various solid fuels combusted in residences in China. The results are shown as means and standard deviations. Fuels are classified into several groups marked by “A”, “B”, “C”, “D”, “E”, and “F”, with statistically significant difference among the groups and insignificant within each group based on the results of multiple comparisons at a significance level of 0.05.

	ANT/(ANT+PHE)	FLA/(FLA+PYR)	BaA/(BaA+CHR)	IcdP/(IcdP+BghiP)	BbF/(BbF+BkF)	BaP/(BaP+BghiP)
corn pellet	0.12±0.02 A	0.53±0.04 A B	0.38±0.06 B	0.46±0.05 B	.55±0.03 C	0.49±0.08 C
wood pellet	0.10±0.02 A B	0.54±0.05 B C	0.34±0.10 A	0.48±0.05 B C	0.55±0.06 C	0.59±0.12 D
crop residue	0.12±0.02 A B	0.54±0.03 A B C	0.48±0.03 C	0.53±0.03 C D	0.55±0.04 C	0.58±0.04 D
fuel wood	0.12±0.01 A B	0.54±0.02 B C	0.49±0.04 C	0.55±0.03 D	0.51±0.04 B	0.63±0.04 E
brushwood	0.13±0.02 B C	0.52±0.02 A	0.56±0.04 D	0.54±0.01 D	0.50±0.03 B	0.56±0.02 D
anthracite briquette	0.14±0.06 B C	0.53±0.03 A B C	0.47±0.08 C	0.54±0.20 D	0.46±0.09 A	0.69±0.09 F
bituminous briquette	0.16±0.09 C D	0.53±0.06 A B C	0.32±0.07 A	0.28±0.05 A	0.57±0.01 C	0.37±0.03 A
raw anthracite	0.18±0.04 D	0.56±0.02 C	0.40±0.12 B	0.29±0.04 A	0.49±0.03 A B	data not available
raw bituminous	0.24±0.08 E	0.55±0.02 C	0.54±0.05 D	0.52±0.21 C D	0.55±0.07 C	0.47±0.12 B