Guidance by Audience
Recommended actions at each air quality level, for schools, employers, and households.
Schools
AQI 1-2 (Good/Fair)
Normal outdoor activities and sports.
AQI 3 (Moderate)
Outdoor activities fine for most students. Monitor students with asthma.
AQI 4 (Poor)
Move outdoor sports and recess indoors where possible.
AQI 5 (Very Poor)
Cancel outdoor activities entirely. Keep windows closed.
Employers (Outdoor Workers)
AQI 1-2 (Good/Fair)
No special precautions needed.
AQI 3 (Moderate)
Provide masks for workers with respiratory sensitivities.
AQI 4 (Poor)
Provide N95 masks. Increase break frequency for outdoor workers.
AQI 5 (Very Poor)
Minimize outdoor work duration. Provide masks and frequent indoor breaks.
Households
AQI 1-2 (Good/Fair)
Normal ventilation, windows can stay open.
AQI 3 (Moderate)
Sensitive household members should limit prolonged outdoor time.
AQI 4 (Poor)
Keep windows closed during peak hours. Use air purifiers if available.
AQI 5 (Very Poor)
Keep windows closed. Avoid outdoor activity. Seek medical advice for breathing difficulty.