How would the proposed standards affect emissions and air quality?
When the proposed emission standards for Large SI, recreational engines, and marine diesel engines are fully implemented in 2020, we expect a 70 percent reduction in HC emissions from these engines, a 75 percent reduction in NOx emissions, and a 56 percent reduction in CO emissions. These emission reductions will help reduce ambient concentrations of ozone, CO, and fine PM. In addition, they will reduce personal exposure for people who operate or who work with or are otherwise in close proximity to these engines and vehicles. They will also improve visibility in national parks.
