I recently bought a PMSA003 sensor and started logging the results indoors in a capital city. Three big discoveries were that opening the windows made the air quality way worse, sometimes the air quality is bad indoors and out without any clear coloration with other weather events and finally deodorant is absolutely awful.

We're about to start messing around with filters, I built a home brew one with a duct fan and an inline activated carbon filter, but we've bought a retail filter that will be here soon so that will be interesting.

I do think more people should be aware of their air quality.