Air Pollution of Nature Reserves near Cities in Russia

Table 2

Particle size distribution in snow samples collected in the Bastak Nature Reserve.

PM fraction (μm)	Distribution of PM in snow samples (%)
	B1			B2			B3			B4			B5
	1	2	3	1	2	3	1	2	3	1	2	3	1	2	3
≤1	2.2	3	3.9	7.6	3.4	0.1	3.1	3.6	0.2	2	1.1	1	4.3	1.1	2.5
1–10	61.6	24.3	33.4	53.6	22.2	10.3	46.6	30.9	37.9	25.9	11.9	27.3	62	11.4	44
10–50	13.4	27.4	31.9	0.9	28.1	4.5	39.2	18.3	40	23.5	32.4	21.5	11.7	28.5	20
50–100	0	7	0	0	17.4	0	0	10	0	8.6	17.6	0	0	20.6	0
100–400	0	18.2	0	0	17	0	0	8.7	0	3.1	27.1	0	0	30.5	0
400–700	1.9	19	18.2	4.2	11.3	4.1	0.5	21.6	1.8	9.9	9.9	5.6	1.9	7.9	10.7
≥700	20.9	1	12.6	33.7	0.6	81	10.6	6.9	20.1	27	0	44.6	20.1	0	22.8
Mean diameter (μm)	207.2	154.5	215.3	332.2	117.5	800.8	110.2	257.7	201.9	311.0	137.9	445.5	199.6	128.7	262.6