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scrapmek t1_jcmsagb wrote

Reply to comment by echawkes 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

This is the main difference, there was actually an incident where medical grade UVC bulbs made for sterilizing were accidentally used at an event which caused 'sunburn' and eye damage to the attendees.

Many organisms have evolved some resistance to UVA and UVB since it reaches the planets surface, although they can still cause enough damage to have a mild sterilizing effect.

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