KitchenSandwich5499 t1_jcmo5zj wrote
Reply to comment by frustrated_staff in If UV radiation is used to disinfect and sterilise things then why isn't everything the sun touches (your skin, the sidewalk etc) sterile? by Critwhoris
True. Also, most of the uv from the sun at the earths surface is uva with a little bit of b. Most of b and c are filtered out by ozone and such. So, not the most effective wavelengths
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