Air Pollution of Nature Reserves near Cities in Russia

Table 1

Particle size distribution in snow samples collected in Birobidzhan city.

PM fraction (μm)	Distribution of PM in snow samples (%)
	G1			G2			G3			G4			G5
	1	2	3	1	2	3	1	2	3	1	2	3	1	2	3
≤1	9.7	2.3	1	0.8	0.6	0	4.1	2.1	0.9	7.5	2.9	0	3.8	3.3	3.1
1–10	41.9	22.1	19	55.1	4.7	25.8	31	23.6	15.7	64.9	30.2	0.9	47.2	36.3	10.2
10–50	19.5	39.6	33.9	36.7	8.2	0	42.1	55.7	29.5	13.5	33.6	0	44.6	38.7	3.6
50–100	0	9.2	0	0	0.5	0	2.7	17.3	0	0	0	0	4.4	3.9	0
100–400	0	3.7	1.9	0	30.8	0.3	12.7	1.3	0	0	16.8	0	0	2.7	6.5
400–700	7.5	11.8	35.5	0.3	46.7	45.9	7.4	0	4.9	0.9	16.2	9	0	0.8	41.1
≥700	21.4	11.3	8.7	7.1	8.5	28	0	0	49	13.2	0.3	90.1	0	14.3	35.5
Mean diameter	234.0	183.3	277.6	74.4	410.2	492.8	79.6	29.0	485.2	130.9	138.1	892.8	16.4	152.6	553.6