We provide a commercial and a popular open-hardware air quality monitor [1] that includes CO2 as well as PM 2.5, VOCs, NOx, humidity and temperature. I am talki

We provide a commercial and a popular open-hardware air quality monitor [1] that includes CO2 as well as PM 2.5, VOCs, NOx, humidity and temperature. I am talking everyday with people around the world about why they want to measure air quality and the parameters they are interested in. On CO2, we observe mostly three different use cases: CO2 as an approximator of Covid infection risks: With the possibility to use CO2 levels as an aproximator of aersols with potential virus load, CO2 became quite popular as a measure about how effective the ventilation works. CO2 as an indicator of cognitive performance: There are a number of studies, e.g. [2] showing a clear link between high CO2 levels and impaired cognitive performance. I am seeing more and more people that especially want to measure CO2 levels in order to keep them low and have a better working environment. CO2 as an indicator of ventilation rates: Without ventilation, indoor pollutants e.g. harmful gases from furniture, colors, building materials etc. will increase. Some of them can be measured as TVOCs but not all of them. Low CO2 values indicate a high rate of air exchanges and these typically flush out these indoor pollutants. Ideally the HVAC system uses HEPA and carbon filter for the fresh air intake to ensure that the air coming in is clean. In climate zones with a high differential between indoor and outdoor temperature, heat exchangers should then be used. If you measure more than CO2, but also PM and Temperature and you have the ability to control your ventilation rates (either by manually opening windows or by a demand controlled HVAC system) you can see and optimize potential tradeoffs, e.g. cooling or heating energy is wasted by increasing fresh air ventilation rates or opening windows will bring down CO2 but increase PM if you live in a polluted area. Regarding the OPs question on moving away from gas stores. Here the new TVOC sensor from Sensirion SGP41 [3], that can be uses in our open-source open-hardware air quality monitor [1], is able to measure NOx and can be a good indicator if your stove emits fumes into the living area. [1] https://www.airgradient.com/open-airgradient/kits/ https://www.airgradient.com/open-airgradient/kits/ [2] https://dash.harvard.edu/handle/1/27662232 https://dash.harvard.edu/handle/1/27662232 [3] https://sensirion.com/products/catalog/SGP41/ https://sensirion.com/products/catalog/SGP41/