In addition, SIPs for extreme O3 areas must
pollutants are currently focused on nonattainment areas, our discussion here will be largely limited to the “attainment-demonstration SIP” submitted by an area after it has been designated a nonattainment area. As indicated in Box 3-3, the CAA requires that an attainment-demonstration SIP be submitted to EPA within 3 years of an area’s being designated a nonattainment area. The agency or agencies responsible for preparing an attainment-demonstration SIP vary from state to state. Often, it is prepared by the relevant state or tribal authority; in other cases, a local or regional government is given primary responsibility.
The key elements of an attainment-demonstration SIP are the following:
An emissions inventory.
An analysis involving air quality model simulations as well as observational data and related evidence to determine the amount and types of emission reductions needed to bring about compliance by the appropriate date.
A description of the emission-control strategies and enforcement measures to be adopted to achieve the required reductions.