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rofo1 parent
That depends on your location. I've built something similar to this tool that is discussed here and I've tested in multiple locations.

For example, Vienna air was so clean (<= 10 pm10 ug/m^3), that you don't need any purifiers or anything like that.

MartinMond
If you think Vienna's air is clean, you didn't measure during winter and/or during an inversion. You absolutely need air purifiers.

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