To amend the Clean Air Act to provide for an optional provision for the reduction of work-related vehicle trips and miles travelled in ozone nonattainment areas designated as severe, and for other purposes.

Amends the Clean Air Act to authorize a State in which all or part of a Severe ozone nonattainment area is located to submit a plan revision requiring employers in such area to implement programs to reduce work-related vehicle trips and miles by employees. (Current law requires such States to submit such revision within two years of the enactment of the Clean Air Act Amendments of 1990).

Authorizes such revision to require employers in such areas to increase average passenger occupancy per vehicle in commuting trips between home and workplace during peak travel periods. (Current law requires specified increases in average passenger occupancy.)

Authorizes (currently, requires) the revision to require employers subject to a vehicle occupancy requirement to submit a compliance plan.