Pollution

Fireworks are a beloved tradition of the Fourth of July, but the colorful displays also bring a spike in air pollution, a new study shows.

People who breathe polluted air every day may have smaller brains, and a higher risk for "silent strokes," researchers say.

Toxic lead buried in icy layers of an Andes glacier reveals that leaded gasoline was the region's worst polluter in the last 2,000 years.

In California, tougher rules about air pollution are linked with better lung health in children, a large new study finds.

Suicides correlate with air pollution levels in Salt Lake county, Utah, adding to a small but growing body of research that suggests that environmental factors influence suicide risk.

Traces of air pollution from 16th-century Spanish silver mines were discovered deep inside an ice cap in the Peruvian Andes.

A striking new video from NASA reveals how the greenhouse gas carbon dioxide spreads across Earth in a single year.

Kids may be more likely to develop ADHD if they are exposed to higher levels of air pollution before birth, a new study suggests.