Want to find just how far away a terrestrial subject is? We've rounded up the best rangefinder binoculars, which are are also excellent for stargazing. Keep an eye out for Prime day deals, too.

El Paso sees worsening air quality amid New Mexico forest fires.

Download this Set Line Graph Schedule Chart Diagram Measuring Spoon And Micrometer Icon Vector vector illustration now. And search more of iStock's library of royalty-free vector art that features ...

The "2.5" figure means particles are 2.5 micrometers in diameter or smaller, according to the EPA — that is 30 times smaller than the average human hair, which is about 70 micrometers in diameter.

Air quality alert remains in effect for entire Chicago area. When will it improve? According to the NBC 5 Storm Team, the worst air quality in the country Friday was recorded in Ann Arbor, Michigan ...

Air quality alert issued for entire Chicago area, with AQI reaching ‘unhealthy' levels due to smoke The poor air quality for Illinois and parts of Indiana is expected to last at least until ...

Hundreds of Canadian wildfires are impacting multiple U.S. states, even as far south as Florida.

Meteorologist Chita Craft breaks down how Saharan dust can affect air quality and its potential health impacts.

Plumes of Saharan dust are expected to sweep over Florida in the coming days, which can cause real problems for people with respiratory issues.

This map tracks air quality near Detroit, and zoom out to see more areas. Smoke from wildfires in Canada is expected to move into Michigan.

This map tracks air quality near Detroit, and zoom out to see more areas. Smoke from wildfires in Canada is expected to move into Michigan.