UV-A radiation

^[1]^[2]^[3]

Introduction

Ultraviolet with wavelengths of 320-400 nm. UV-A can be transmitted through glass.

front windshields in automobiles block 96% of UVA light
- shatterproof front windshields contain 2 layers of glass with a UVA-blocking layer of plastic in between
side windows block 71% of UVA light (variable, 59-96%)
- side windows are made of a single layer of glass
- tinting has no effect^[3]

↑ Stedman's Medical Dictionary 26th ed, Williams & Wilkins, Baltimore, 1995
↑ Sunlight, Ultraviolet Radiation, and the Skin http://consensus.nih.gov/cons/074/074_intro.htm
↑ ^3.0 ^3.1 Boxer Wachler BS Assessment of Levels of Ultraviolet A Light Protection in Automobile Windshields and Side Windows. JAMA Ophthalmol. Published online May 12, 2016 <PubMed> PMID: https://www.ncbi.nlm.nih.gov/pubmed/27258091 <Internet> http://archopht.jamanetwork.com/article.aspx?articleid=2522190
Weiss JS UV-A Protection From Auto Glass, Cataracts, and the Ophthalmologist. JAMA Ophthalmol. Published online May 12, 2016 <PubMed> PMID: https://www.ncbi.nlm.nih.gov/pubmed/27258328 <Internet> http://archopht.jamanetwork.com/article.aspx?articleid=2522181