Why EPA Emissions Standards for Diesel Generators Matter

Beginning in 1994, the Environmental Protection Agency (EPA) set in place a tiered emissions standard for nonroad compression-ignition (diesel) engines. The standards went through four stages, called tiers, which tightened the standards for these diesel engines periodically until 2015. All stationary diesel engines currently produced (with some exceptions) must comply with final Tier 4 (T4F) regulations. […]