. 2020 Jun 18;188:109807. doi: 10.1016/j.envres.2020.109807

Table 3.

Correlation table for atmospheric pollutants at Loni, Ghaziabad District.

Pollutant ↓	→	PM 2.5	PM10	SO₂	NO₂	O₃	NO	NH₃	CO	C₆H₆
PM 2.5	Pearson coefficient	1	0.95***	0.30	0.93***	−0.56***	0.84***	0.93***	0.91***	0.90***
	P (2 tailed)		0	0.121	0	0.002	0	0	0	0
	N	28	28	28	28	28	28	28	28	28
PM 10	Pearson coefficient	0.95***	1	0.37	0.93***	−0.49***	0.78***	0.90***	0.81***	0.80***
	P (2 tailed)	0		0.05	0	0.008	0	0	0	0
	N	28	28	28	28	28	28	28	28	28
SO₂	Pearson coefficient	0.30	0.37	1	0.17	0.20	0.24	0.26	0.23	0.27
	P (2 tailed)	0.121	0.05		0.375	0.315	0.223	0.189	0.237	0.171
	N	28	28	28	28	28	28	28	28	28
NO₂	Pearson coefficient	0.93***	0.93***	0.17	1	−0.62***	0.79***	0.90***	0.84***	0.84***
	P (2 tailed)	0	0	0.375		0	0	0	0	0
	N	28	28	28	28	28	28	28	28	28
O₃	Pearson coefficient	−0.56***	−0.49***	0.20	−0.62***	1	−0.42***	−0.62***	−0.53***	−0.52***
	P (2 tailed)	0.002	0.008	0.315	0		0.027	0	0.004	0.005
	N	28	28	28	28	28	28	28	28	28
NO	Pearson coefficient	0.84***	0.78***	0.24	0.79***	0.42***	1	0.85***	0.95***	0.91***
	P (2 tailed)	0	0	0.223	0	0.027		0	0	0
	N	28	28	28	28	28	28	28	28	28
NH₃	Pearson coefficient	0.93***	0.90***	0.26	0.90***	−0.63***	0.85***	1	0.88***	0.85***
	P (2 tailed)	0	0	0.189	0	0	0		0	0
	N	28	28	28	28	28	28	28	28	28
CO	Pearson coefficient	0.91***	0.81***	0.23	0.84***	−0.53***	0.94***	0.85***	1	0.95***
	P (2 tailed)	0	0	0.237	0	0.004	0	0		0
	N	28	28	28	28	28	28	28	28	28
C₆H₆	Pearson coefficient	0.90***	0.80***	0.27	0.84***	0.52***	0.91***	0.85***	0.95***	1
	P (2 tailed)	0	0	0.171	0	0.005	0	0	0
	N	28	28	28	28	28	28	28	28	28

The correlations are expressed as Person's correlation coefficient, where *** denote significant correlations at p < 0.01 (two-tailed).