EPA is announcing approval of a revision to the State Implementation Plan (SIP) for the control of the volatility of gasoline during the summertime in the Kansas portion of the Kansas City area. This action approves amendments to Kansas' control on the summertime Reid Vapor Pressure (RVP) of gasoline distributed in Johnson and Wyandotte Counties. This revision changes the RVP limit from 7.2 pounds per square inch (psi) to 7.0 psi, and from 8.2 psi to 8.0 psi for gasoline containing at least 9.0 percent by volume but not more than 10.0 percent by volume ethanol. This is a part of the State's plan to maintain clean air quality in Kansas City.