The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

History books can only cover so much, and most of us haven’t cracked one open since we were in college. But if you want to ...

Space can be a wondrous place, and we've got the pictures to prove it! Take a look at our favorite space pictures here, and if you're wondering what happened to today in space history don't miss ...

Altadena was one of several communities scorched by the fires. (Photo by David McNew/Getty Images) Saturday, 11:00 a.m. PSTCal Fire data reported the Palisades and Eaton fires at full containment ...

citing cumulus clouds, thick cloud layers and liftoff winds. The private space company scrubbed that second New Glenn launch attempt just after 9 p.m. Monday. No reason or further details were ...

Toronto has seen the worst air quality of major cities in the world on Wednesday as southern Ontario is blanketed by smoke from wildfires. Global News meteorologist Anthony Farnell said the plume ...

If we are able to clear the clouds early in the day on Sunday, temperatures may climb back into 50s. Cooler temperatures will be arriving by the middle of next week. Long range models do want to ...

PLANNING THE NEXT 24 HOURS: Clouds will increase through the morning with temperatures only reaching the lower 20s Tuesday afternoon. It will be breezy through the morning and afternoon with ...

We'll likely have more clouds than sun, but lighter winds compared to yesterday. With the jet stream directly overhead, strong winds will fire back ... often features your photos and videos ...

Stunning discoveries and fresh breakthroughs in DNA analysis are changing our understanding of our own evolution and offering a new picture of the "other humans" that our ancestors met across ...