Cost-effective ways exist to improve your indoor air quality that will reduce your COVID and flu risk, lower your cancer and lung disease risk, and eliminate headaches and sleepiness caused by poor ventilation.
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this (https://www.co2meter.com/collections/all/products/home-wireless-indoor-air-quality-co2-monitor?variant=44675161850054) looks like the monitor in the pix. $149
The article cited: s CO2 an Indoor Pollutant? Direct Effects of Low-to-Moderate CO2 Concentrations on Human Decision-Making Performance - https://pmc.ncbi.nlm.nih.gov/articles/PMC3548274/pdf/ehp.1104789.pdf