And lots of other UV gets though. Sunlight remains a great disinfectant, maybe not as much as a narrow-spectrum bulb, but it still carries plenty of microbe-killing power. From the actual article:
>> In a paper submitted to the Royal Society of London, they described how over the course of six months they had used sunlight to prevent bacteria from growing in a tube.
Humans have known about this for millennia, with ancient doctors regularly telling people to expose wounds to sunlight. Even animals have been seen instinctively "sunning" a wound. (I remember a BBC doc about Antarctica where a penguin was shown exposing a bite wound to the low-angle sunlight.) Only in recent years has a fear of cancer caused us to retreat from any and all sunlight, a fear revisited as we learn the downsides.
UVC is blocked by the ozone layer.
Plus the air is not always “fresh” depending on where you live and what time of year. Ozone, smog, smoke, etc.
Plus for those of us with allergies, an open window during for example ragweed season can be a nightmare.
And lots of other UV gets though. Sunlight remains a great disinfectant, maybe not as much as a narrow-spectrum bulb, but it still carries plenty of microbe-killing power. From the actual article:
>> In a paper submitted to the Royal Society of London, they described how over the course of six months they had used sunlight to prevent bacteria from growing in a tube.
Humans have known about this for millennia, with ancient doctors regularly telling people to expose wounds to sunlight. Even animals have been seen instinctively "sunning" a wound. (I remember a BBC doc about Antarctica where a penguin was shown exposing a bite wound to the low-angle sunlight.) Only in recent years has a fear of cancer caused us to retreat from any and all sunlight, a fear revisited as we learn the downsides.
https://pmc.ncbi.nlm.nih.gov/articles/PMC2290997