Many young adults keep track of the UV through weather apps on their smartphones, in hopes that a high number will lead to a better tan — but some health experts are warning of the potential dangers.

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HOUSTON — It's important to protect your skin from harmful sun exposure, but how do you know when to lather on the sunscreen? That's where the UV Index, which measure UV radiation levels, can help.

There’s smoke and ash outside. You feel like you’re inhaling tiny dust particles. You check your weather app for the air quality. But what do the numbers and colors mean? The Air Quality Index is a ...