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 ...

BEIJING (Reuters): 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 ...

BEIJING: China has reduced air pollution nearly as much in seven years as the United States did in three decades, helping to bring down average global smog levels. The amount of harmful ...