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Might be a stupid question but does this work for external air pollution? I live at the 20th floor in a city with terrible air quality and we open the windows o
by ggregoire 8y ago
Might be a stupid question but does this work for external air pollution? I live at the 20th floor in a city with terrible air quality and we open the windows once or twice a day.
- mannykannot 8y agoI 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 agoThat'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.