1. Short title This Act may be cited as the Regional Greenhouse Gas Reduction Act of 2019 . 2. Definitions In this Act: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Greenhouse gas The term greenhouse gas means carbon dioxide, methane, nitrous oxide, hydrofluorocarbon, perfluorocarbon, and sulfur hexafluoride. (3) Office The term Office means the Office of Regional Greenhouse Gas Reduction Programs established under section 3(a). (4) Regional greenhouse gas reduction program The term regional greenhouse gas reduction program means a program that uses market-based tools to reduce greenhouse gases across States at the regional level, such as— (A) the Regional Greenhouse Gas Initiative organized among, as of November 14, 2019, the States of Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont to cap and reduce carbon dioxide emissions from the power sector; and (B) the Western Climate Initiative, a regional carbon trading system organized between the State of California and Quebec, Canada. (5) State The term State means— (A) a State; (B) the District of Columbia; (C) the Commonwealth of Puerto Rico; (D) the United States Virgin Islands; (E) Guam; (F) American Samoa; (G) the Commonwealth of the Northern Mariana Islands; and (H) the Trust Territory of the Pacific Islands. (6) Unit of local government The term unit of local government means— (A) a city, town, borough, county, parish, district, association, or other public body created by or pursuant to State law; (B) an Indian tribe (as defined in section 4 of the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5304 ))