"International and domestic travelers are essentially redefining how they discover the U.S.," an expert told Newsweek.

The elevated levels of fine particulate matter resulting from wildfire smoke could present significant health risks.

America's silent poisoning: Map shows the US states most at risk Pesticide 2,4-D is a widely used herbicide that helps controls the growth of weeds such as clovers and dandelions around a variety ...

The smoke floating over the border shared between America and Canada is now impacting air quality in states as far south as Texas, AirNow's data shows. The EPA has declared the air quality in states ...