Air pollution

Pollution from China's coal-burning power plants is pumping up winter storms over the northwest Pacific Ocean and changing North America's weather, a new study finds.

The dry conditions in California have only worsened winter haze, so regulators are implementing burn bans to prevent soot from accumulating.

A Chinese man in a northern city is suing the government for the choking pollution that has settled over the city, arguing that the government failed in its duty to protect the environment.

An influx of nitrogen-based compounds, usually from industrial agriculture, fuel exhaust and power plants, is blanketing national parks around the country, potentially disrupting their ecosystem.