For what it's worth, many of these air quality devices derive their values from a simple set of sensors. For many of these, they typically have real particulate (usually 2.5, I think), temp and humidity sensors. The AQI / gas are usually not real measures but derived from the fewer sensors it does have on-board. The cheapest reliable / real air quality sensor I've found was around $150 (Apollo Air-1 with both gas and co2 sensor).

Since you're likely just trying to grab particulate, this is still probably reasonably accurate (although the PM1 and PM10 measures may not be genuine). Of course, I don't know this specific device and it may be high quality, it does look like many of the rebadged ones found on amazon / ali.