The 1999 Ozone Attainment Plan was adopted by the BAAQMD, the Metropolitan Transportation Commission, and the Association of Bay Area Governments and submitted to the California Air Resources Board in June 1999.

ARB approved the plan in July 1999 and submitted it to the U.S. Environmental Protection Agency. On March 30, 2001, EPA proposed to partially approve and partially disapprove the plan. In response, the three co-lead agencies are proposing to correct deficiencies in the 1999 Plan by preparing a Bay Area 2001 Ozone Attainment Plan.