Question

What measures should be taken in the AQI 459 scenario?

Answer 1

An AQI of 459 is “Hazardous” (301–500) emergency conditions where everyone is likely to be affected; stay indoors and avoid all outdoor exertion, keep windows/doors closed, and monitor local alerts. Use a clean room (close off one interior room), run a portable HEPA air cleaner or high‑efficiency (MERV‑13) filters on recirculate, avoid indoor activities that produce particles (cooking, smoking, candles), and if you must go outside wear a well‑fitting NIOSH‑approved respirator (N95); people who are young, elderly, pregnant, or have heart/lung disease should keep medications on hand and seek medical help for severe symptoms.