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Last year a buddy and I both got really interested in internal air quality. You can purchase CO2 monitors like this one on amazon. I found that my office was about 700 ppm and my car varied based on whether I was using outside and or inside air as the source for my air conditioning.

We also had a co-worker that had a device that would measure PM2.5 particulates (I'm not sure where he got it from, but I'm told it was quite expensive).

The most intersting result I got from all of this had to do with my home office. I found that if I was working in it for a long time with the windows closed, I would get over 1000ppm CO2 in under 2 hours. As a result, I made sure to open my windows every time I was in there for more than 15 minutes.

This actually made a lot of sense to me after the fact because I would often getting tired while working in there, but I had previously assumed it was from lack of stimulation or laziness.

Not really going anywhere with this, but if you are someone who is interested in this topic because you have bad air quality locally, I encourage you to look around for tools that let you measure the environments you frequent.

Linked for as a visualisation tool, link set to CO but there is a number of filters. Helped me grasp the staggering scale of China's emissions. https://www.windy.com/-CO-concentration-cosc?cosc,21.125,107.139,3