What Happened: The U.S. Environmental Protection Agency (EPA) recently proposed to delay Biden-era Tier 4 emissions standards for light- and medium-duty vehicles by two years, extending Tier 3 ...

EPA has proposed delaying compliance deadlines for certain light- and medium-duty vehicle emissions standards by two years, moving Tier 4 requirements to model year 2029.

The EPA has proposed delaying stricter emissions standards for light-duty and Class 3 medium-duty vehicles until model year 2029.

EPA proposes delaying Tier 4 standards for light and medium-duty vehicles until 2029 to match current market demands.