¹ Specifically, the CMAQ program is designed under ISTEA to assist areas designated "non-attainment" or "maintenance" for ambient ozone and carbon monoxide levels, and is expanded under TEA-21 to include areas with similar designations for particulate matter.

² "The Congestion Mitigation and Air Quality Improvement (CMAQ) Program Under the Transportation Efficiency Act for the 21^st Century (TEA-21): Program Guidance." Federal Highway Administration and Federal Transit Administration (April 1999). Internet: http://www.fhwa.dot.gov/environment/cmaq.htm.

³ Federal Register, February 23, 2000, p. 9052.

⁴ Federal Register, February 23, 2000, p. 9052.

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