### Question
How is the "baseline gasoline" defined?


### Answer
The term **baseline gasoline** is defined in *42 U.S.C. § 7545* as follows -

> in the case of gasoline sold during the high ozone period (as defined by the Administrator) a gasoline which meets the following specifications:




 |   BASELINE GASOLINE FUEL PROPERTIES |  |
| API Gravity | 57.4  |
| Sulfur, ppm | 339    |
| Benzene, % | 1.53 |
| RVP, psi | 8.7  |
| Octane, R+M/2 | 87.3  |
| IBP, F | 91    |
| 10%, F | 128    |
| 50%, F | 218    |
| 90%, F | 330    |
| End Point, F | 415    |
| Aromatics, % | 32.0  |
| Olefins, % | 9.2  |
| Saturates, % | 58.8  |


#### (ii) Wintertime


The Administrator shall establish the specifications of "baseline gasoline" for gasoline sold at times other than the high ozone period (as defined by the Administrator)

#### Citation:
  - *42 U.S.C. § 7545*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part A-Motor Vehicle Emission and Fuel Standards**

