There is a nice figure from Mortality risk from United States coal electricity generation regarding the impact of coal generated pm2.5. Initially, I was a little bit skeptical as coal pollution is presumably associated with poverty which has myriad health implications. On the other hand, this figure is very compelling which shows that in a number of cases, total excess deaths decreased after a scrubber was installed. Hard to argue with that data, which is helpfully presented as a rich time series – allowing one to draw that conclusion without being told!