PHILADELPHIA (WPVI) -- With smoke blowing into the Philadelphia region from the wildfires in Canada, you may have heard a lot about the Air Quality Index or AQI. But what it is, exactly? The Air ...

Angelenos still bothered by the smell of smoke may be surprised to see that Air Quality Index numbers returned to “healthy” or “moderate” levels this week in L.A. County, but they shouldn’t breathe a ...

ORLANDO, Fla. – Meteorologists talk about what the UV index numbers are all the time and what it will be on that particular day, but what does it mean for you? Well first, ultraviolet radiation is ...

We get sunlight every day, but some days the ultraviolet rays are stronger than others. You know this intuitively if you’re prone to burning: You probably skip the sunscreen if you’re going for a walk ...

Air quality concerns have popped up a lot so far this summer, especially when the Canadian wildfires pushed thick plumes of smoke our way. At times, the air quality reached very unhealthy to hazardous ...