The article linked in the first paragraph is almost more interesting to me[1]. Some of these places, like the subway, have air frequently circulated that can filter aerosols but leave CO2; this limitation makes me somewhat doubt its usefulness as a proxy for disease transmission risk.

Apart from disease transmission, since I've gotten a CO2 monitor in my apartment I've noticed that running the gas stove or oven for even a little while will make a huge spike in CO2.

[1] https://grieve-smith.com/ftn/2026/02/so-you-want-to-monitor-...

Gas stove, oven, and clothes dryer with polyester/nylon will all cause my air quality sensor to go into the red.

Some takeaways:

- be very careful of what oils you're using when cooking food to ensure they are not turning volatile

- try to avoid using a dryer for non-natural poly clothes and use hang drying instead