In regard to coal dust from the Oak Creek power plant:
I always regarded the coal dust to be more of a nuisance than a health hazard. I worked in the plant for more than 32 years. The plant had to be kept clean to prevent fires.
During my tenure in the 1970s, I did miss five days of work. This was caused by flu-like symptoms. Otherwise, I was lucky enough to have a perfect attendance.
Come July 1st, I will be retired 30 years. Therefore, I believe I didn't have my health problems from exposure to coal dust.
I am not forgetting the miners with the black lung disease they were exposed to. I'm sure they were exposed to greater amounts and less fresh air.