This helps prevent polluted air from re-entering the room and gives the purifier a better chance to keep the air clean
To be certified, an air cleaner must pass electrical safety tests and, for electronic cleaners, must not produce ozone greater than 0.050 parts per million (50 ppb)
For example, wildfire smoke can carry larger particulates, while cigarette smoke may involve both small particulates and strong odors
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One thing to consider, though, is that cigarette smoke can contain volatile organic compounds (VOCs) that a HEPA filter wont work well for, which is where an activated carbon filter comes in
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