WASHINGTON — The Environmental Protection Agency on Dec. 20 announced more stringent clear-air standards for heavy trucks that the agency said are 80% stronger than current limits. Starting with model year 2027 trucks, the EPA’s new standards — the first update to its heavy-truck rules in more than two decades — will by EPA estimates reduce nitrogen-oxide emissions from trucks by more than 40% by 2040 and by nearly 50% by 2045, at which point it projects most of the regulated fleet will have converted to newer equipment.

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