This article outlines several steps you can take to stay safe when air quality is poor. Health experts advise people at higher risk to stay indoors with their windows shut, avoid exercise, and wear an N95 mask.

Air purifiers equipped with HEPA filters (high-efficiency filters that trap tiny particles) are effective, provided they are the right size for the room. While officials monitor air quality in Montreal and across Quebec using the Air Quality Index (AQI), many critics argue this system is outdated and inaccurate. Because of these flaws, experts and advocacy groups are calling on the government to update air quality standards and set up air-conditioned public shelters.