§ 86.099-11 Emission standards for 1999 and later model year diesel heavy-duty engines and vehicles.
(a) Exhaust emissions from new 1999 and later model year diesel heavy-duty engines shall not exceed the following:
(1)
(i) Hydrocarbons (for diesel engines fueled with either petroleum-fuel or liquefied petroleum gas). 1.3 grams per brake horsepower-hour (0.48 gram per megajoule), as measured under transient operating conditions.
(ii) Total Hydrocarbon Equivalent (for methanol-fueled diesel engines). 1.3 grams per brake horsepower-hour (0.48 gram per megajoule), as measured under transient operating conditions.
(iii) Nonmethane hydrocarbons (for natural gas-fueled diesel engines). 1.2 grams per brake horsepower-hour (0.45 gram per megajoule), as measured under transient operating conditions.
(2) Carbon monoxide. (i) 15.5 grams per brake horsepower-hour (5.77 grams per megajoule), as measured under transient operating conditions.
(ii) 0.50 percent of exhaust gas flow at curb idle (methanol-, natural gas-, and liquefied petroleum gas-fueled diesel only).
(3) Oxides of Nitrogen. (i) 4.0 grams per brake horsepower-hour (1.49 grams per megajoule), as measured under transient operating conditions.
(ii) A manufacturer may elect to include any or all of its diesel HDE families in any or all of the NOX or NOX plus NMHC ABT programs for HDEs, within the restrictions described in § 86.098–15 as applicable. If the manufacturer elects to include engine families in any of these programs, the NOX FELs may not exceed 5.0 grams per brake horsepower-hour (1.9 grams per megajoule). This ceiling value applies whether credits for the family are derived from averaging, trading or banking programs.