MADISON, Wis. -- Dane County could lead the country to cleaner air with a new effort to open more "green" gas stations.

A special federal grant will equip 100 local gas stations with technology to reduce ozone pollution and save thousands of gallons of gasoline, WISC-TV reported.

The OPW Vaporsaver System stops gasoline vapor before it enters the air and converts it back to gas in underground storage tanks.

Customers at the pump won't notice a difference, WISC-TV reported.

Officials said that they estimate stations could save nearly 500 gallons of gas per month.