Table 2: Bivariate correlation coefficient for COVID-19 variables and PM2.5 parameters for 145 and 100 regions of the USA and UK, respectively.

Variables Total cases PCI Total deaths PD
USA
Mean PM2.5 .260** .137* .294** .305**
Min PM2.5 .291** .236** .354** .460**
Max PM2.5 .172* -.030 .143 .014
UK
Mean PM2.5 .388** .315** .311** .171
Min PM2.5 .308** .338** .254** .074
Max PM2.5 .330** .141 .240* .202

Note **P< .001, *P< .05, PCI: proportion of cases infected, PCD: proportion of deaths