. 2020 Aug 5;204:111035. doi: 10.1016/j.ecoenv.2020.111035

Table 4.

Correlation analysis between R₀ and air quality factors in low, medium and high flow.

Air quality factors	Low flow (n = 9)		Medium flow (n = 10)		High flow (n = 10)
Air quality factors	Coefficient	P	Coefficient	P	Coefficient	P
AQI	0.019^a	0.961	−0.149^a	0.681	0.401^a	0.251
CO	0.038^a	0.923	0.095^a	0.794	0.644^a	0.044
CO_24 h	0.036^a	0.927	0.100^a	0.784	0.661^a	0.038
NO₂	−0.043^a	0.913	−0.512^a	0.131	−0.657^a	0.039
NO₂_24 h	−0.047^a	0.905	−0.509^a	0.133	−0.645^a	0.044
O₃	0.114^a	0.770	−0.143^a	0.693	0.042^a	0.909
O₃_24 h	0.004^a	0.991	−0.135^a	0.711	−0.213^a	0.555
O₃_8 h	0.128^a	0.743	−0.146^a	0.686	0.048^a	0.896
O₃_8 h_24 h	0.176^a	0.650	−0.157^a	0.665	0.014^a	0.970
PM₁₀	0.005^a	0.990	−0.067	0.855	0.230^a	0.522
PM₁₀_24 h	0.012^a	0.976	−0.067	0.855	0.241^a	0.502
PM_2.5	0.053^a	0.893	−0.152^a	0.675	0.459^a	0.182
PM_2.5_24 h	0.052^a	0.894	−0.141^a	0.697	0.469^a	0.171
SO₂	0.069^a	0.861	0.370	0.293	−0.118^a	0.744
SO₂_24 h	0.066^a	0.867	0.370	0.293	−0.099^a	0.786

The correlations were quantified by Pearson correlation coefficient (designated with “a”) or with Spearman correlation coefficient (no letter designation).