I heard it's good to ventilate at least twice a day for 30 minutes.
Then what should I do when fine dust is severe like these days?Would it be better not to do it at times like this?
526 2018-03-25 Gentleman
Fine dust is a problem, but if you don't ventilate, you can't ventilate carbon dioxide and radon, so it's good to have bad fine dust
Even if there's fine dust, I recommend that you ventilate and clean it with an air purifier
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