https://www.scienced...011134420303444
“The spectral transmittances of these materials and the integrated transmittances in the UVB from 300 nm, UVA, visible (VIS) and near infrared ranges (NIR) were calculated. In summer in the UVB range from 300 nm methacrylate and smoked glass have the highest transmittance values (56%) and polycarbonate present the lowest (30%). In the VIS and NIR ranges methacrylate (95%) and smoked glass (80%) have the highest transmittances and polycarbonate the lowest (45%).”
https://www.irbnet.d...nda/CIB1832.pdf
“1.1 The effect of UV
When sunlight falls onto polycarbonate, the polycarbonate molecules absorb energy of certain wavelengths in the UV range, this is particularly so for the ester groups and the aromatic rings which are strong UV absorbers.”