| Band | PM2.5 | Required action |
|---|---|---|
| Good to ModerateNow | 0–35 | Normal outdoor work. Standard protection. |
| Unhealthy (SG)Now | 36–55 | Limit strenuous tasks, extra breaks. KN95 offered, hydration. |
| UnhealthyNow | 56–150 | Reschedule non-essential outdoor work. KN95 required, refuge breaks. |
| Very unhealthyNow | >150 | Suspend outdoor work. Move to indoor refuges. |