July 25, 2011 at 1:37 pm

Black smoke spewing from building tops is not exactly a summertime image — us New Yorkers like our heating oil issues to emerge at seasonally appropriate times, like Thanksgiving, thank you very much. But after the mayor announced that the city would begin phasing out the two worst kinds of oil by 2030, some buildings figured they better start cleaning up their act — and soon.

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