The purpose of the District's Indirect Source Review (ISR) Program is to encourage developers to incorporate clean air measures and reduce emissions of NOx and PM10 from new development projects. In general, new development contributes to the air-pollution problem in the Valley by increasing the number of vehicles and vehicle miles traveled. In 2005, on-road vehicles generated approximately 200 tons per day of NOx and direct PM10 pollution in the Valley. Although newer, cleaner technology is reducing the per-vehicle pollution, the emissions increase from new development putting more vehicles on Valley roads partially offsets the emission reductions gained from technology advances.
The District Rule 9510 (Indirect Source Review) and Rule 3180 (Administrative Fees for Indirect Source Review) are the result of state requirements outlined in the California Health and Safety Code, Section 40604 and the State Implementation Plan (SIP). The District’s SIP commitments are contained in the District’s 2003 PM10 Plan and Extreme Ozone Attainment Demonstration Plan (Plans), which identify the need to reduce PM10 and NOx in order to reach the ambient air-pollution standards on schedule. The Plans identify growth and reductions in multiple source categories. The Plans quantify the reduction from current District rules and proposed rules, as well as state and federal regulations, and then model future emissions to determine if the District may reach attainment for applicable pollutants.
The PM10 and Ozone plans have determined that the ISR Rule, in addition to existing and future rules and conditions, will help clean the Valley’s air and reach attainment.