Table 3.

Average concentrations (C, ng/m³) and contributions (%) of nine sources, as deduced by PMF for our study site, during the three periods.

Sources		P1	P2	P3	Average
Fireworks burning	C	2300	1890	360	1600
	%	55	55	7.7	40
Coal combustion	C	104	40	123	85
	%	2.5	1.2	2.6	2.1
Vehicle emissions	C	430	930	134	540
	%	10.3	27	2.9	13.3
Dust	C	410	45	2600	890
	%	9.8	1.4	56	22
Zn smelter	C	510	220	300	340
	%	12.1	6.5	6.4	8.4
Se industry	C	135	77	71	95
	%	3.2	2.3	1.5	2.3
Oil combustion	C	47	71	72	63
	%	1.1	2.1	1.5	1.5
Cr industry	C	12.0	4.5	19.9	11.3
	%	0.3	0.2	0.4	0.3
Iron and steel industry	C	240	147	970	410
	%	5.7	4.3	21	10.1