Table 2.
The simulated spreading distance under various environmental conditions from a SARS-CoV-2 spreader in typical scenarios.
| Events | Size diameter (μm) | Velocity (m/s) | Temperature (°C) | Humidity | Horizontal distance (m) | Remark | References |
|---|---|---|---|---|---|---|---|
| Sneezing | 60–100 | 50 | 20 | 50% | about 5 | Using Wells evaporation-falling curve | [33] |
| Coughing | 45–80 | 10 | 20 | 50% | about 1.5–2 | ||
| 30 | 10 | 20 | 30% | 1.25–1.5 | |||
| 30 | 10 | 20 | 70% | about 2.25 | |||
| Speaking | 20 | 5 | 20 | 50% | about 1 | ||
| Breathing | 20 | 1 | 20 | 50% | <0.5 | ||
| Model assumptions | Size Distribution [109] | 4.1 | 30 | 20% | <1.8 | Under most regions proposed by the authors, the spreading distance may exceed 1.8 m | [31] |
| 30 | 60% | 1.8–2.4 | |||||
| 30 | 90% | >3.6 | |||||
| 20 | 20% | <1.8 | |||||
| 20 | 20% | about 1.8 | |||||
| 20 | 60% | >2.4 | |||||
| 20 | 90% | >3.6 | |||||
| Coughing | 60 | 10 | 25 | 35% | >2 | [110] | |
| Coughing | 100 (droplet size) | 10 | 30 | 84% | 6.6 | Outdoor, wind speed of 2 m/s | [111] |
| 0.8 | Outdoor, wind speed of 0 m/s | ||||||
| Coughing | 1000 (droplet size) | 1.3 | Outdoor, wind speed of 2 m/s | ||||
| Coughing | About 80–100 | 10 m/s at 0.1 s and decays to zero at 0.5 s | 25 | 60% | Probably <1 m | Considering evaporation | [30] |
| About 2–80 | 25 | 60% | Probably >1 m |