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When will Northeastern States require ultra-low sulfur heating oil (ULSHO)?

In 2012, New York, which at the time had over a million households using heating oil, was the first northeastern state to set a home heating oil sulfur content standard to 15 ppm.
Massachusetts, New Jersey and Vermont followed suit with a less-stringent 500 ppm standard in 2014, but are all going to require ULSHO by 2018.