This summer, as you select sun protection and sunscreen products, you’re likely to notice that in addition to SPF (Sun Protection Factor) ratings, you may also see PA ratings. The PA rating will be followed by a series of plus signs (+) to indicate how strong the sun protection product is. All Murad sunscreen products include PA ratings. To understand what a PA rating is and why you should look for it in addition to an SPF rating, you first need to understand the difference between UVA and UVB rays.
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UVA and UVB rays are both forms of ultra-violet rays. It’s likely that you are most familiar with UVB rays. These are the rays that cause sun tanning (and sun burn) and which you are protected from when you wear a sunscreen with SPF protection rankings. UVB rays aren’t always present or powerful. They are seasonally stronger in the summer and most powerful in the noon time hours. However, they can reflect off of snow and water, so it’s always good to be extra protected when around those two natural elements.
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