Tourists at two Texas nature reserves have been warned of unhealthy air quality levels on Thursday, according to the U.S. Environmental Protection Agency (EPA).

Dhaka, the overcrowded capital city of Bangladesh, has ranked fourth on the list of cities with the worst air quality with an ...

Dhaka, the overcrowded capital city of Bangladesh, has ranked fourth on the list of cities with the worst air quality with an ...

What we know about the Reno-area air quality index and how high it has to be to shut down Washoe County School District ...