8  Transportation Conformity , http://www.epa.gov/OMS/stateresources/transconf/.  7  EPA,  General Conformity , http://www.epa.gov/air/genconform/.  9  FAA Order 1050.1 and accompanying Desk Reference,  https://www.faa.gov/regulations_policies/orders_notices/.  There is a wide range of federal, state , and local governmental agencies that are involved in air  quality management throughout the U.S. The primary regulatory agencies with jurisdiction in the  management of air quality as it pertains to FAA-supported activities are summarized in  Table 2­ 2  ( Regulatory Agencies ) along with synopses of their roles and responsibilities.  The states that require ISR generally establish thresholds for the applicability of ISR . For  example, a state may ISR for all projects that increase total airport  throughput at an  airport by more than 100,000 passengers per year, add 1,000 new parki ng spaces, or increase  aircraft operations by 1,000 per year . Projects that exceed the thresholds could be required complete an indirect source analysis and obtain an indirect source permit. 9  Indirect source review  (ISR) requirements are state- specific, and in some states it may be  required as part of their SIP when proposed  federal actions are located in nonattainment maintenance areas. Indirect sources may include highways, parking facilities, sports entertainment facilities, and office buildings. Any applicable indirect source requirements should  be identified as early as possible during the NEPA scoping process and described in the NEPA  documentation.  General and Transportation Conformity applicability to airport actions, analysis considerations,  coordination points and demonstration options are discussed in  Section 8  (Conformity).  Areas  where General Conformity, Transportation Conformity, and NEPA requirements interface with  one another are also highlighted.  The General Conformity Rule of the CAA ensures that actions occurring in EPA -designated  NAAQS nonattainment or maintenance areas that receive federal funding, support, approval , or  permitting are accounted within, or do not in any way interfere with, the attainment strategy of  an EPA-approved SIP(s). 7  The Transportation Conformity Rule of the CAA governs the federal funding and approval of  highway and transit projects occurring in NAAQS nonattainment or maintenance areas such that  these activities will not cause new NAAQS violations, exacerbate existing violations, otherwise interfere with an area’s attainment strategy outlined within an EPA-approved SIP(s). 8  Special purpose plans can also be prepared to address unique issues in select nonattainment or  maintenance areas, such as transport of pollutants across large areas in the case of O $_{3}$, and the  formation of regional haze in the case of PM.  Aviation Emissions and Air Quality Handbook  2.2.4.  General/Transportation Conformity Rules  2.3. Regulatory Agencies  2.2.5.  Indirect Source Review  8$_{ }$