School Bus Emissions Reduction

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Each full-sized school bus with a Model Year (MY) 1994 or newer engine must be equipped with specific emissions control systems, including either: a closed crankcase filtration system and a level 1, level 2, or level 3 device; an engine that the U.S. Environmental Protection Agency (EPA) has certified as meeting MY 2007 emissions standards; or use of compressed natural gas or other alternative fuel that EPA or the California Air Resources Board has certified to reduce particulate matter emissions by at least 85% as compared to ultra-low sulfur diesel fuel. Beginning January 1, 2035, school districts may only purchase zero-emission school buses, and all school buses in Connecticut must be zero emission by 2040. School districts within environmental justice communities as of July 1, 2022, must transition to zero emission buses by January 1, 2030. School districts may enter zero-emission school bus contracts for 10 year periods.

(Reference Connecticut General Statutes 14-164o and Senate Bill 4, 2022)