Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
O.5.2.3.5 Wavelengths in UVB rays are the main contributors to the UV index. The contribution from the UVA rays is only about 10 %. The UV index, therefore, is highly affected by the thickness of the ozone layer.