EPA Demands Manufacturer Data as It Expands Action on DEF System Failures
February 15, 2026
A brief summary of recent EPA changes to DEF-related failures.
A brief summary of recent EPA changes to DEF-related failures.
California is looking to reduce NOx emissions from non-road engines by 90% and enforce particulate filters on all engines. Here is a summary of the latest workshop to get stakeholder feedback on Tier 5 standards.
Here’s a summary of California’s latest thinking on “Tier 5” tailpipe NOx emission standards for off-road construction and farming equipment.