Control of Air Pollution; Final Rule for New Gasoline Spark- Ignition Marine Engines; Exemptions for New Nonroad Compression- Ignition Engines at or Above 37 Kilowatts and New Nonroad Spark- Ignition Engines at or Below 19 Kilowatts

As directed under section 213 of the Clean Air Act as amended in 1990 (CAA), EPA is regulating exhaust emissions from new spark- ignition (SI) gasoline marine engines (including outboard engines, personal watercraft engines, and jet boat engines) because exhaust emissions from SI gasoline marine engines cause or contribute to ozone concentrations in more than one ozone nonattainment area. Once the program is fully implemented, manufacturers of these engines must demonstrate to EPA that hydrocarbon emissions are reduced, by 75% from present levels, by testing engines representative of the product line before sale and after use. The result of these regulations will be a new generation of cleaner gasoline marine engines available to boaters. EPA is also revising existing regulations for new nonroad CI engines at or above 37 kW and new nonroad SI engines at or below 19 kW so as to include exemptions comparable to exemptions provided to highway engines.