You are here: U.S.: overview of gasoline quality specifications in PADD 2 statesPart 3: State gasoline quality regulations in PADD 2 states3.A: Illinois
3.A: Illinois
Illinois has two conventional gasoline formulations: one applicable to areas below the 40th parallel and one for areas above it. In addition, federal reformulated gasoline (RFG) use is required in two metropolitan areas within the state:
    •Chicago/Milwaukee metro (in the northeast corner of the state), defined as Cook, Du Page, Lake, McHenry, Kane and Will counties, as well as parts of Kendall County and Grundy County. This metro area adopts RFG on a mandatory basis due to air quality non-compliance
    •St. Louis metro (in the southwest corner of the state). Although the city of St. Louis proper is in the state of Missouri, the city’s eastern suburbs spill over into Illinois: these encompass Jersey, Monroe, Madison and St. Clair counties. This area adopts RFG on an “opt-in” basis:
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3.A: Illinois