| Category | Exposure level |
|---|---|
| 0 | Trivial (95th percentile <0.01 x exposure limit) |
| 1 | Highly controlled (95th percentile >Category 0 but <0.1 x exposure limit) |
| 2 | Well controlled (95th percentile > Category 1 but <0.5 x exposure limit) |
| 3 | Controlled (95th percentile> Category 2 but < exposure limit |
| 4 | Poorly controlled (> exposure limit) |
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