Pollution

Portable sensors allow users to monitor exposure to pollution with smartphones.

The entire Maldives, a nation of low-lying islands, pledges to become a sustainable reserve.

A city's ozone levels are linked to people's risk of cardiac arrest.

NASA planes track pollution to figure out how to improve air-quality monitoring from space.

Moms-to-be who are exposed to outdoor air pollution may have smaller babies.

Just what is in that brown, hazy layer of air around you?

If it's high up in the atmosphere, it's good. If you're breathing it in, it's bad.

In the desert, wind-blown plastic bags and balloons outnumber rattlesnakes.

Exposure to air pollution from cars in early life may increase the risk of autism, a new study suggests.

Floodwaters contain toxic chemicals and urban waste in Hurricane Sandy's aftermath.

New underwater views of the Great Barrier Reef debut as activists fight to save it from a neighboring mega-mine.

About forty percent of our rivers and 46 percent of lakes are too contaminated for swimming or aquatic life.

A new study adds to the growing evidence that antioxidants may combat some of the effects of air pollution on the body.

A newly devised ranking system evaluates the health of individual countries’ waters too.

In Stockholm, scientists measure flow of hazardous substances in urban areas.

A new study of air pollution levels in New Jersey has found an increased risk of stillbirths among women exposed to specific pollutants.

About half of the airborne particles and droplets found over North America are foreign.

The Gulf of Mexico’s dead zone may be average or quite small, depending on whom you ask.

Hospitals, among the nation's worse polluters, pledge to get green.

High levels of caffeine in waterways signal serious sewer problems.