Why is EPA looking at new emission controls for Industrial Spark-Ignition Engines?
Our analysis shows that nonroad spark-ignition engines over 19 kilowatts (“Large SI engines”) emit almost 700,000 tons of hydrocarbons (HC) plus oxides of nitrogen (NOx) each year across the United States, which help form smog. They can also emit high levels of carbon monoxide and toxic compounds such as benzene, which is especially problematic for engines operating indoors. Reducing these emissions would benefit our health and environment. The Clean Air Act requires us to set emission standards that address these problems. These impacts are described in more detail in “FAQ:Environmental Impacts of Recreational Vehicles and Other Nonroad Engines” [EPA420-F-01-030].
