Classification index
Very Unhealthy (AQI 201–300)
Summary: This is a health alert level where risk is increased for everyone.
Health implications
Symptoms can develop quickly during outdoor exposure, including breathing discomfort and reduced physical tolerance.
Recommended actions
- Avoid prolonged outdoor activity.
- Use cleaner indoor air spaces with filtration.
- Postpone outdoor events and strenuous exercise.
For schools and workplaces
Move most activities indoors and maintain frequent condition updates and protective guidance.
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A Health Alert, Not a Suggestion
AQI 201–300 is a health alert — risk of rapid symptom onset is real for everyone, not just sensitive groups.
Avoid prolonged outdoor activity. Use cleaner indoor air spaces with sealed windows and filtration. Postpone outdoor events and strenuous exercise. If you must go outside, an N95 mask is essential. People with asthma or heart disease should contact their care provider if symptoms worsen. Check the Detection Map hourly; conditions can shift fast.