I used to work at the stations mentioned, we had big signs on the nearby highway pointing out that the "smoke" coming out of the towers was just water vapour. T

I used to work at the stations mentioned, we had big signs on the nearby highway pointing out that the "smoke" coming out of the towers was just water vapour. The actual pollution was generally pretty hard to spot thanks to various ash and particulate collection methods in action, that is unless one of the boilers was being restarted and diesel was being burnt, in which case the smoke was quite black and visible.