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Table 4. Correlation coefficient analysis between COVID19-CFR and Particulate Matters (PM). (‘+’ values are considered as positively significant and ‘-‘ values are positively significant, *p<0.05, *p<0.01)

From: Association between ambient air pollutants and meteorological factors with SARS-CoV-2 transmission and mortality in India: an exploratory study

Period

Cities

PM2.5

PM10

PM2.5

PM10

Spearman_rho

Kendall’s_tau

Phase 1

Delhi

-0.25**

-0.25**

-0.27*

-0.27**

Kolkata

0.33*

0.33*

0.51**

0.51**

Phase 2

Delhi

0.71**

0.76*

0.60**

0.63**

Kolkata

1.00**

0.95**

0.99**

0.86**

Total study period

Delhi

0.64**

0.70**

0.77**

0.78**

Kolkata

0.78**

0.77**

0.80**

0.78**