There are now affordable devices available to monitor air quality at home. I've recently bought one [1] that measures PM2.5, CO2 and tVOC amongst other things. It's quite interesting to see spikes in particulate matter after crop harvesting or in certain weather conditions and determine if there's an apparent relation to difficulty of breathing.

[1] https://cleargrass.com/air_monitor/overview (Website in Chinese only, unfortunately. The device can be set to english though.)