| Article Types | Primary Search Words in the Review of the Literature (January 1, 2020, to January 28, 2021) | Combination Search Words in the Review of the Literature* (January 1, 2020, to January 28, 2021) | ||
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| COVID-19 | Coronavirus | SARS-CoV-2 |
| All Media | + “Ventilation” | 467 | 75 | 39 |
| + “HEPA” | 9 | 3 | 1 | |
| + “Purifier” | 5 | 8 | 3 | |
| + “Window” | 58 | 30 | 9 | |
| + “Indoor Air Quality” | 14 | 3 | 5 | |
| Journal Articles | + “Ventilation” | 116 | 9 | 10 |
| + “HEPA” | 0 | 0 | 0 | |
| + “Purifier” | 1 | 0 | 0 | |
| + “Window” | 11 | 0 | 4 | |
| + “Indoor Air Quality” | 5 | 0 | 2 | |