many of the Amazon sold meters that used to display only time, temperature and humidity
now have CO2 and PM 2.5

some reviews

https://smartairfilters.com/en/blog/best-pm2-5-air-quality-monitors-2023/

The little belt worn battery powered air pumps that catch dust particles in a filter that is then mailed to a certified laboratory are very very expensive and have been around since 1970.
Coal miners hate them for their noise and weight and they have been “accidently” dropped in mud holes, zapped with arc welders, or run over by caterpillar tracked 30 ton mining machines.
Miners also routinely place them in the clean “intake air” tunnel where there is little dust.
By law coal dust must be diluted by at least an equal amount of finely ground up, specially selected, limestone dust.
Inside of coal mines are white colored because of the “rock dusting.”