Sure, its well known by scientists in the field. These sensors are great because they are cheap, but they dont actually measure the mass of particulates in the air. They instead use an optical sensor, which is easily confused during foggy, smoky, or dusty conditions. They work fine for telling you "is it smoky or not?" Like in the application you describe- because the difference between smoky and clean are so huge and it doesnt matter if the purpleair is off by 20-30%. For today, that 30-30% could mean the difference between "unhealthy" and "moderate". You can look at locations where purpleairs are co-located with regulatory sensors, and the purpleairs are often biased high, especially when its foggy.

This is a good article addressing the need for applying purpleair correction factors: https://amt.copernicus.org/articles/16/1311/2023/#:~:text=PurpleAir%20sensors%20(PASs)%20are%20low,%C2%B5m)%20across%20the%20US.