Tints added by the dealer or owner, consists of a darkened film applied over the glass. This is particularly common in back windows where children often sit. Factory darkened windows lack a protective UV film. This paper fails to differentiate factory smoked/tinted from dealer tinted windows. The polyvinyl can absorb UV B decreasing penetration. Side windows are often made of a single layer of tempered glass while the windshield is made of laminated glass with a polyvinyl middle layer for crash protection. In order to better understand this, it is important to understand the differences in side window and windshield manufacturing techniques. Therefore, most car window UV penetration can be assumed to be much higher for UV A which is a longer wavelength than UV B. Glass filters out UV B very effectively, but not UV A. The author's assumption that UV A and B penetration levels will be similar is not accurate based on UV wavelength and penetration differences. This paper lists a much higher level of protection which could lead care providers to falsely reassure patients that they are adequately UV A protected in their vehicles. I doubt the level of protection has dropped 50% in 2 years. This is very different from the values in this paper listing 97% and 98% UV A blockage for 20 models. The 2015 Honda Accord side window and windshield both block 46% of UV. We have spoken to Honda Customer service. At least for Honda (and likely the other major manufacturers) this is not entirely accurate. The author states that the level of UV A auto glass protection for drivers is unknown.
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