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When we looked back at the competitors we had originally tested but not picked, we found a similar pattern of complaints on some of them. Many reviews we read also complained of glitchy Wi-Fi connections and poor customer support. We had found them to be reliable on particulate readings in our testing, but clearly something was going wrong once the devices had run for a while in many people’s homes. We never gave up on our original goal of recommending an indoor air quality monitor, yet when revisiting this guide in autumn 2021, we were alarmed by the number of serious, credible complaints stating that our 2019 air quality monitor picks delivered obviously inaccurate readings, especially for volatile organic compounds (VOCs).

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We contacted a researcher to talk about using CO2 monitors for air quality measurements, and together we came up with a product recommendation, as well as some advice on how to interpret and react to its information when monitoring CO2 at home. And even absent the virus, both public spaces and homes can accumulate high levels of CO2 from everyday activities-not just breathing, but from using gas stoves and water heaters. Researchers at the University of Colorado in Boulder found that CO2 levels could be used as a proxy for coronavirus risk in crowded public indoor spaces because we exhale both CO2 and, if we’re sick, viruses in the same breath.

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And whether you have measured proof or just a hunch that your indoor air quality is poor, there are simple, consistently effective ways to clear the air as much as possible: Run an air purifier or upgrade your HVAC filters to capture fine airborne particles, and open your windows on nice days to vent any volatile organic compounds.įor 2022, we have added a recommendation for a CO2 (carbon dioxide) monitor. The EPA has a guide to radon, including state-by-state resources for knowing whether your region is at risk and how to get your home tested. Many smoke detectors also detect carbon monoxide see our guide to smoke alarms for more about them.

They rarely measure carbon monoxide and radon, two potentially deadly gases. The type of home-focused indoor air-monitoring devices we evaluated for this guide offer less information by comparison, as they typically measure only the local airborne particle levels and sometimes volatile organic compounds-gases like the vapors from paint, cleaners, and glue. If data (or a hunch) suggests that you have poor air quality, improve it by circulating air through purifiers or HVAC filtration.