2002 NEI for Point Sources: Integration of HAPs and CAPs

The Environmental Protection Agency (EPA) compiles the National Emission Inventory (NEI) for criteria air pollutants (CAPs) and hazardous air pollutants (HAPs). Title I, Section 110 of the CAA requires states to submit emission inventories for CAPs as part of their State Implementation Plans. The NEI for HAPs is compiled to determine if Clean Air Act (CAA) programs are successful in reducing emissions and human health and environmental risk due to HAP emissions. The NEI contains estimates of facility-specific CAP and HAP emissions, along with their source-specific parameters necessary for modeling such as location and facility characteristics (stack height, exit velocity, temperature, etc.). Complete source category coverage is needed; the NEI contains estimates of emissions from stationary point and nonpoint and mobile source categories. Point source categories include major and area sources as defined in section 112 of the CAA. Nonpoint source categories include area sources and other stationary sources that may be more appropriately addressed by other programs rather than through regulations developed under certain air toxic provisions (sections 112 or 129) in the CAA. Mobile source categories include onroad and nonroad categories. Previous versions of the NEI maintained separate databases for CAPs and HAPs. The 2002 NEI will contain merged CAP and HAP data.