Add Yahoo as a preferred source to see more of our stories on Google. There are multiple ways to describe how wet the air is (yes, pretty much all air is wet). What I mean by that is there are water ...

What happens to smoke particles after sunset can depend strongly on something as familiar as the amount of water in the air.

It's a T-shirt kind of day in Washington, DC: 85 degrees with 63 percent humidity. We all know those numbers mean hot, but what exactly does that humidity percentage tell us? And why should we care?

Dry air and poor humidity control in classrooms are drawing scrutiny as districts weigh health, budget, and building-maintenance tradeoffs.

New research finds indoor relative humidity between 40 and 60 percent is associated with relatively lower rates of COVID-19 infections and deaths, while indoor conditions outside this range are ...

High humidity forces your body's cooling systems to work harder than usual, leading to fatigue. Studies show that when ...

Proper indoor ventilation is key to reducing the spread of COVID-19. Now, a study by MIT researchers finds that indoor relative humidity may also influence transmission of the virus. Relative humidity ...