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 We all know that the sun's rays are dangerous and can cause a lot of damage, including such as premature aging and cancer. But not everyone knows how it happens, and what is the difference between UVA and UVB rays. Did you know that there are also UVC-rays? So what we really need to know about the sun?
Indeed, there are three types of rays: UVA, UVB and UVC.
UVC-rays
This is a very short waves, and they do not reach the Earth's atmosphere filtering. Therefore, about them we have nothing to worry about.
UVA-rays
This long wave ultraviolet radiation, 95% of which reaches the Earth. They are present in our lives every day, year round, from the moment when the sun rises, and to sunset. And UVA-rays come to us in any weather, in any climatic zone. That is why, despite the fact that they are weaker than UVB-rays, they can do more harm. They penetrate clouds, windows and their penetration into the skin deeper. Therefore, sunscreen needs even indoors and in any weather.
UVA-rays really surround us constantly and destroy the same time. They not only create a tan on the skin, they are one of the sources of the formation of free radicals (one of the first causes of aging).
But the photo-aging - is not the only problem associated with UVA-rays. They can cause abnormal cell production, which may subsequently cause cancer.
UVB-rays
This medium wave ultraviolet radiation. Only five percent of them reach the Earth's surface. Part of it is absorbed by clouds, and the other part - the ozone layer. So, you guessed it, is so harmful hole in the ozone layer, they are bad consequences, not only the environment but also our skin.
UVB-rays are most active from 10 am to 4 pm. The only relief they do not pass through clouds and windows. But there is bad news: these rays - more powerful than the wavelength (UVA), and the harm from them can be quite a lot. This damage can be seen at once - it is sunburn, as well as abnormal cell mutations and their development, and as a result - skin cancer.
 Conclusion
Now you know why it is important to use a broad-spectrum sunscreen protection. Unfortunately, most creams are protected only by one type of radiation.
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Filters SPF
- It is the protection of only UVB-rays. Such filters are most sunscreens.
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Filters IPD and PPD
- A protection against UVA-rays. Be sure to check that your vehicle included, and UVA-filters (this titanium dioxide, zinc oxide, Mexoryl, Tinosorb or Avebenzone).
And do not skimp on good means from the sun, which includes both types of protection. Good luck the rest!
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