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I have noticed every time I open my windows, the no2 levels reported on my Dyson filter spike. Not sure what to make of it but it’s interesting.



nox is a combustion byproduct so probably that?


Yeah I would assume it was coming mostly from nearby cars.


The crazy thing is there are no nearby cars. There is a highway about 1.5km away which I assume it must all blow from. There is nothing else within 1.5km




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