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Tuesday’s air quality warning has dropped to a 5, considered a moderate risk, down from Monday’s peak of 10+ on the Air Quality Health Index’s 10-point scale.

We will see much lighter winds for Wednesday with temperatures that head back up to average in the mid to upper 80s.

We need to talk about weather apps for a sec. I don’t know about you guys, but my iPhone’s built-in weather app has been ...

How sunlight and surf shape our eyes by Andreas F. Borkenstein, MD ...

When millions of people turn off their lights for Earth Hour each year, something remarkable happens in the night sky above ...

The UV Index provides a measure of the sun's ultraviolet radiation, a short wavelength of light invisible to humans, that can cause sunburns. Sunburns are a factor that can lead to deadly health ...

UV rays in Lake Tahoe vary up to 100 times between wet and dry years, a UC Davis study finds, raising concerns for lake life amid climate extremes.

Three robots are at work in a northeast Iowa hospital, making the final sweep to make sure rooms are disinfected after a patient is discharged. Finley Hospital in Dubuque is the first hospital in ...

Social media users across the Southwest, including in Arizona, shared photos of a mysterious beam of light in the sky on the night of May 16.

UV Light Helps Us Understand Why the Archaeopteryx Was Such a Good Flier Scans of the Chicago Archaeopteryx show feather and bone features that worked together to create lift.

Catch meteors, planets, and possibly a new star as May serves up dazzling views and a rare nova waiting to burst into sight. May skies are brimming with action: shooting stars from Halley’s Comet, ...