Table 2. Differences of number and mass concentration in various size distributions.

Size distribution (µm)	N (n)	Distance (cm)	Mean number concentratrion (number per litre)	p-value (NC23 VS NC41)	Mean mass concentratrion (µg per m3)	p-value (MC23 VS MC41)
0.35–0.5	12	23	1,551,681.83	0.002	1,354.62	0.02
	12	41	1,196,072.41		792.24
0.5–0.75	12	23	627,701.75	0.036	335.54	0.03
	12	41	295,825		250.76
0.75–1	12	23	51,610.25	0.041	289.72	0.01
	12	41	30,879.58		145.47
1–2	12	23	29,477.50	0.021	378.60	0.02
	12	41	7,821.08		231.08
2–3.5	12	23	7,835.08	0.012	574.13	0.26
	12	41	2,863.87		291.99
3.5–5	12	23	4,192.83	0.017	639.13	0.01
	12	41	3,111.16		383.51
5–6.5	12	23	1,310.75	0.036	357.58	0.02
	12	41	482.83		236.07
>6.5	12	23	2,216	0.024	1,314.35	0.03
	12	41	717.08		680.44
Total	12	23	3,827,707.83	0.009	6,598.32	0.04
	12	41	2,733,845.45		3,803.82