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In April of 2011, the New York City Department of Environmental Protection (DEP) issued regulations requiring buildings to convert from No. 6 and No. 4 heavy heating oils to cleaner fuels. The deadline for the phase-out of all No. 6 heating oil, the dirtiest form of heating fuel, was June 30, 2015. To date, DEP has achieved 99.8 percent compliance with the regulation. The deadline for the phase-out of all No. 4 heating oil is Jan. 1, 2030.
