ALL aspects of the pollution can be controlled in big power generation plants.
For example coal power plants have advanced filter systems, which can reduce pollutants by more than 99% in some cases.
http://i.imgur.com/dsNgDvn.png
http://web.archive.org/web/20150611212052/http://www.babcock...
http://link.springer.com/article/10.1007/s40789-014-0001-x
Moreover, in power plants, coal burns in a much more optimal conditions, what results in less pollutants being generated.
> According to Environment Canada, coal-fired power plants in Alberta in 2011 emitted only 0.4% of PM2.5 of human-made emissions (excluding wildfires).
https://friendsofscience.org/assets/documents/FoS_BurningQue...
The only thing which can't be controlled is CO2. But this is not a pollutant.