Monitor air quality using AirNow.gov or local alerts; an AQI 150 or higher signals unhealthy conditions for the general public. Keep windows and doors closed, run a HEPA air purifier, and avoid strenuous outdoor activity. If you must go outside, wear a properly fitted N95 respirator to filter fine particulate matter.

Pay close attention to vulnerable individuals — children, older adults, and anyone with asthma, heart disease, or other chronic conditions. Check on neighbors and family members regularly, and ensure they have access to clean indoor air and necessary medications.

Follow guidance from the EPA and CDC for creating a clean room, using air conditioners on recirculate mode, and avoiding activities that increase indoor pollution like burning candles or vacuuming without a HEPA filter. Prepare an emergency kit with masks, water, and a battery-powered air quality monitor.