Does everyone need a carbon filter? Not necessarily. Not all homes have dangerous levels of harmful gases or VOCs that would call for a carbon filter. VOCs are more common in homes: with recent home renovation or repainting with smoke or other offensive odours near a source of gas pollution, like a factory If you have inflammation or asthma symptoms, you may also consider using a carbon filter. Purifier companies have a financial incentive to convince people to buy carbon filters. They make more money if they can scare people into buying carbon. We won’t do that. Check the facts and data first before spending your money.