Is it safe to exercise outdoors when the air quality is bad? - The Washington Post

When wildfire smoke leads to air quality alerts, exercisers can take precautions to stay safer and lower health risks.

Air pollution, traffic, and more: How exposure affects death risk

Air pollution - Wikipedia

Wildfire Smoke: How to Know if You Can Exercise Safely Outside

Early start to wildfire season puts air quality front of mind for coaches and athletes

Officials warn of dangerous conditions as brush fires bring smoke to D.C. area - The Washington Post

N.Y.C. has worst air quality in the world due to Canadian wildfires

Nearly everyone is exposed to unhealthy levels of tiny air pollutants, study says - The Washington Post

What is the Air Quality Index? Here's How to Stay Safe - The New York Times

Air pollution is so bad in this Asian capital that flights are being diverted due to low visibility

Running in Bad Air Quality: When Is It Safe to Run? — Runstreet

Why an outdoor workout is better for you than indoors - The Washington Post