BEIJING--Authorities issued their highest warnings for fog and haze on Tuesday as smog enveloped major cities in northern China, warning the public that visibility could drop to less than 50 ...

The United States on Tuesday ended pollution tracking by its embassies that had been a vital source of data especially in ...

Chad, in central Africa, is the world’s most polluted country, while California has the worst air pollution in North America, ...

The program had used sensors at more than 80 U.S. embassies and consulates to track air quality, mostly in places where such ...

China’s top leaders pledged to expand the nation’s emissions trading system to cover more industries amid a wider push to ...

CITIES in northern China took emergency action yesterday to combat choking smog, limiting the number of cars allowed on the roads and temporarily closing factories. More than 700 companies halted ...