Another liberal media rhetorical switcharoo. Is Poland polluted because of coal, or because of antiquated, inefficient power plants?
A little of both plus the fact that if they made a switch to Natural Gas...they'd have to pay through the nose to Gazprom which is a Russian company.
Putin has shown no problem recently with using the threat of higher gas prices to keep protests from other European countries over his illegal actions in the Crimea and in Ukraine.
As for the smog problems...perhaps it was just the time of the year (March 2015) but they didn't seem to have much of a smog problem in Warsaw or the other two areas I stayed in.