If this air-clearing technique really proves out, it could transform the use of public indoors space.https://twitter.com/JamesGleick/status/1277956274009837573 …
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*according to this* 253.7nm UV-C lamps do not produce Ozone and in fact destroy ozone.
The nature paper is for 222nm light though, which is more energetic than the homolytic bond dissociation energy of diatomic oxygen (I calculate 240nm.) From that I'd expect 222nm light to be ozone/NOx producing, but I may be missing other factors
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