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I think it would have to do more with power lines conductivity under low temperatures than with industry pollution:

"Even among the materials considered conductive, there can be vast differences in how much electricity can actually pass through. In electrical terms, this is called resistance. Almost all normal conductors of electricity have some resistance because they have atoms of their own, which block or absorb the electrons as they pass through the wire, water or other material. A little resistance may be useful to keep the electrical flow under control, but it can also be inefficient and wasteful."

"A superconductor takes the idea of resistance and turns it on its head. A superconductor is generally composed of synthetic materials or metals such as lead or niobiumtitanium which already have a low atomic count. When these materials are frozen to nearly absolute zero, what atoms they do have grind to a near-halt. Without all of this atomic activity, electricity can flow through the material with practically no resistance. In practical terms, a computer processor or electric train track equipped with a superconductor would use very little electricity to perform its functions."

http://www.wisegeek.com/how-does-a-superconductor-work.htm

Or it might just be the full moon!


I live in Mexico city, so no freezing here (which is good)  I have a friend with a very good sound system that lives in one of the most populated areas in the city,  he has no power conditioning of any kind , after having tested a lot of them, he likes his power directly from the grid!  His system does sound pretty good even at daytime.  I live in a suburb where there should be less comercial and indsutrial power lines pollution and my electricity is useless during the daytime. 
We do have a lot of sun....hmmmm

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