Table 2.

Relative concentration of elements detected in the surface layer of PM₁, PM_2.5 and PM₁₀ in June (summer season) and in December (winter season) in Zabrze, Upper Silesia, Poland

Element	Fraction	Relative concentration (%)
		June	December
C1s	PM1	77.67	79.46
	PM2.5	78.11	80.60
	PM10	79.83	80.34
O1s	PM1	16.01	14.20
	PM2.5	15.61	13.45
	PM10	14.24	13.29
Si2p	PM1	2.99	1.95
	PM2.5	2.96	1.84
	PM10	3.20	2.72
Al2p	PM1	1.56	4.07
	PM2.5	1.50	4.07
	PM10	1.19	3.40
N1s	PM1	0.81	0.96
	PM2.5	0.84	0.97
	PM10	0.79	1.11
S2p	PM1	0.46	0.47
	PM2.5	0.50	0.45
	PM10	0.44	0.44
Ca2p	PM1	0.31	0.12
	PM2.5	0.31	0.14
	PM10	0.31	0.13
Cl2p	PM1	0.21	0.31
	PM2.5	0.18	0.30
	PM10	0.17	0.39