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diesel exhaust fluid system

March 27, 2026

The new EPA diesel exhaust fluid standard is useless

EPA’s March 2026 DEF guidance (IACD-2026-05) does NOT eliminate the Diesel Exhaust Fluid system. Lee Zeldin’s latest letter allows alternate NOx sensors and gradual derates, but falls short of promised relief for truckers and farmers. Why this half-measure misses the mark.
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diesel exhaust fluid system

The new EPA diesel exhaust fluid standard is useless