Modern researchers are changing their critiques about the risks of UVA rays instead of UVB. WHO, the world fitness enterprise, judges each rays to be potentially dangerous, but only whilst over-exposed. The in addition north you cross, the less UVB that is available yr round, so do your homework! In Los Angeles, (latitude ranges), there is UVB months spherical, but with a narrower hour range in winter. If you live higher than Ë latitude (far from the equator), there's no UVB during winter months.