5 articles in this category
Wildfire smoke can turn clean air toxic hundreds of miles away. Learn how fires affect air quality, why the smoke travels so far, and how to protect yourself during smoke events.
Discover how London, Paris, and Stockholm transformed from polluted cities to clean air leaders. Learn the policies and innovations that worked—and how other cities can replicate their success.
India faces one of the world's worst air pollution crises. Explore the data, causes, and health impacts of air quality in Delhi, Mumbai, and other major Indian cities.
A decade of transformation: How Beijing and New York tackled air pollution. Discover the policies, challenges, and lessons from two global megacities' clean air journeys.
Compare air quality across the world's major cities. Discover which cities have the cleanest air and which face the most severe pollution challenges in 2026.
Use our calculator to translate air quality into cigarette equivalents, or move into scenario and comparison pages for clearer decisions.