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WHO recommended classification of pesticides by hazard [4]
| WHO Class | LD50 (mg/kg body weight) | |
|---|---|---|
| Oral | ||
| Ia | Extremely hazardous | <5 |
| Ib | Highly hazardous | 5-50 |
| II | Moderately hazardous | 50-2000 |
| III | Slightly hazardous | 2000-5000 |
| U | Unlikely to present acute hazard | 5000 or higher |
