We do approximately a million and one things in our homes, and a lot of them consistently ding our air quality. Cooking on the stovetopdoing laundryusing conventional cleaning productsburning candles—it all adds up to indoor air that is, depending on where you live, more polluted than the air outside.

Toxic chemicals can cause physical irritation (think itchy throat, watery eyes, and headaches) in some people but not others, which can make it hard to pinpoint how clean or dirty your air actually is.

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