I came to the same conclusion.

Year ago I was cleaning my flat after renovation, there was lots of dust settled everywhere and my first thought was - how do I protect my lungs? There were many one-time-use face masks in hardware store, but those masks did not look like good enough- mainly because of lack of filter. So I bought slightly more expensive aparatus with proper filters. Yet, trademen who were doing the work did not care, they were not wearing anything to prevent dust from being inhaled. I felt so bad for them that I was vacuuming whole place each evening when they were gone (including walls), so at least they would start with no dust... Still, I was wondering how much of their future suffer will be because I was not asking them to protect themselves...