D.C. Mun. Regs. tit. 20, r. 20-904
Beginning on November 1, 1992, and for each oxygenated gasoline control period thereafter, all gasoline purchased, sold, offered for sale, or used in the oxygenated gasoline control area shall contain a minimum of two and seven tenths percent (2.7%) oxygen by weight.
Beginning on November 1, 1992, and for each oxygenated gasoline control period thereafter, each gasoline pump stand from which oxygenated gasoline is dispensed at a retail outlet shall be affixed with a legible and conspicuous label which contains the following statement:"The gasoline dispensed from this pump is oxygenated and will reduce carbon monoxide pollution from motor vehicles."
After November 1, 1997, the requirements of sections 904.1 and 904.2 shall not apply unless the Mayor determines that a national primary ambient air quality standard for carbon monoxide has been exceeded more than once per calendar year at a state or local air monitoring station in the Washington, D.C. - Maryland - Virginia Metropolitan Statistical Areas. In such cases, the requirements of sections 904.1 and 904.2 will not take effect until the next oxygenated gasoline control period, but not less than six (6) months following such determination by the Mayor.
The posting of the statement under § 904.2 shall be in block letters of no less than twenty (20) point bold type; in a color contrasting the intended background. The label shall be placed on the vertical surface of the pump on each side which has price and gallonage meters, and shall be on the upper two-thirds (2/3) of the pump, clearly readable by the public.
The retailer shall be responsible for compliance with the labeling requirements of this section.
D.C. Mun. Regs. tit. 20, r. 20-904