| Sources | Probability (P) | Category of probability | Mean of severity score | Category of severity |
| Cleaning agents | 0.15 | 2 | 0.94 | Minor (1) |
| Construction or building materials | 0.04 | 2 | 1.00 | Minor (1) |
| Pesticides and fertilizers | 0.07 | 2 | 0.57 | Minor (1) |
| Fuel (kerosene/petrol/diesel) | 0.12 | 2 | 1.00 | Minor (1) |
| Others | 0.01 | 2 | 0.00 | Minor (1) |
| Overall | 0.08 | 2 | 0.88 | Minor (1) |
