| Sequence | Environments for Outbreak of SARS | Cause |
| 1 | Increased CO2 emission | Coal combustion, Figure 3(a) |
| 2 | Thin O3 hole | Increased CO2 emissions |
| 3 | High UV radiation | Thin O3 hole and maximum sunspot number in 2000, 2001, 2002, 2003, Figure 4 |
| 4 | High aeolian desert dust | Gobi and Thar Deserts |
| 5 | High rice/wheat | Frequent route of migratory birds flyways |
| 6 | Ideal habitat | Guangdong Province wetlands and mangrove forest for migratory birds |
| 7 | Mild water temperature | 16˚C - 27˚C easy to express viral activity |
| 8 | High relative humidity | 70% - 80% easy to express viral activity |
| 9 | Low salinity | The Pearl River Delta of the East River, North River, and West River filled with hundreds of small islands, easy to express viral activity |
| 10 | Long coastline | 4300 km facing the South China Sea as good habitat for migratory birds |