Natural gas and cooking, for most people, add the most indoor pollution. The EPA page on indoor air pollution monitors: https://www.epa.gov/indoor-air-quality-

Natural gas and cooking, for most people, add the most indoor pollution. The EPA page on indoor air pollution monitors: https://www.epa.gov/indoor-air-quality-iaq/low-cost-air-pollution-monitors-and-indoor-air-quality https://www.epa.gov/indoor-air-quality-iaq/low-cost-air-poll... If you do have a problem companies such as E. L. Foust Co. sell air filtration systems and HVAC filters which contain mixes of activated carbon and various minerals to reduce indoor air pollution. The one we've got is marketed for 500 square feet and eats 75 watts when on, so I'm not sure the plus/minus on the energy efficiency. Still, if you live in a place with wildfires or industry it is useful even if you lived in a non-sealed house.