Table 1.
Number of articles searched and included in the review concerning the keywords
| Keywords | Nature | Springer | Elsevier | MDPI | SAGE | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | n | N | n | N | n | N | n | N | n | |
| Environmental factor and COVID-19 spread | 212 | 4 | 79 | 10 | 1161 | 14 | 14 | 0 | 82 | 1 |
| Temperature and COVID-19 | 1345 | 3 | 118 | 6 | 3114 | 6 | 137 | 4 | 43 | 3 |
| Precipitation and COVID-19 | 131 | 0 | 17 | 2 | 284 | 1 | 12 | 0 | 13 | 0 |
| Temperature, humidity and COVID-19 | 229 | 2 | 15 | 8 | 208 | 8 | 20 | 0 | 3 | 1 |
| Air pollution and COVID-19 | 70 | 2 | 11 | 5 | 211 | 4 | 11 | 0 | 2 | 1 |
| Weather variable and COVID-19 | 43 | 0 | 11 | 5 | 201 | 17 | 0 | 0 | 5 | 1 |
| Windspeed, temperature and COVID-19 | 1 | 0 | 0 | 0 | 1 | 2 | 18 | 0 | 0 | 0 |
| Total | 2031 | 11 | 251 | 36 | 5180 | 52 | 212 | 4 | 148 | 7 |
N: No. of articles obtained after searched by keywords, n: No. of articles included in the review