As wildfires spread through Northern California counties, clouds of smoke and ash are spreading, too, far beyond the flames. Air quality officials have a database that's searchable by ZIP code.
The U.S. space agency and the South Korean government teamed up for the most ambitious study of Korean air quality to date and found the majority of the toxic air is homegrown, and not from neighbors.
Flooding in Houston and utility outages led to belches of fumes from refineries and other industrial sites. Residents of a region already struggling with air pollution wonder: Is it safe to breathe?
Half of all cars in Europe run on diesel, compared to 3 percent in the U.S. But Madrid has vowed to ban diesel vehicles by 2025, to cut air pollution. Paris and Athens have made similar pledges.
Indoor and outdoor air pollution is one of the most extreme threats to children's health — and is on the rise, according to the World Health Organization reports.
A statewide collaborative of nail salons now has 120 members; all have made ventilation upgrades and switched from toxic products to safer ones. Will clients be willing to pay extra to help workers?
The sky appears blue at the beginning of the 13-second video, then completely disappears from view in the haze of brown smog. Dozens of Chinese cities are currently under pollution alerts.