something smelly this way floats
4. Cuyahoga, Ohio (Cleveland), 11.144 million tons of carbon per year
14. Jefferson, Ohio (Steubenville), 6.278
15. Indiana, Pa. (Indiana), 6.224
Here is there image of emitters across the US. I took the liberty of blowing up a section for Pittsburgh and the Ohio Valley. Pittsburgh would be somewhere under the 'a' in Cleveland I think.
And if you didn't catch it on PBS' Nightly Business Report last night, they had a segment looking specifically at Pittsburgh's neo-Coal industry.