3 ms·

I imagine it would help with particulate matter (such as smoke, whether visible or not), but I do not think it would have any effect on gases such as ozone, sul

I imagine it would help with particulate matter (such as smoke, whether visible or not), but I do not think it would have any effect on gases such as ozone, sulfur dioxide or nitrous oxide.

ed_balls 8y ago
That's correct. HEPA filters anything bigger than 2,5 μm e.g. https://en.wikipedia.org/wiki/Benzopyrene https://en.wikipedia.org/wiki/Benzopyrene and NO2, SO2 etc. are 1000x smaller.