Expired50% confidenceFactExact time
A 2020 report by the Clean Air Task Force (CATF) estimated that the total number of illegally modified diesel vehicles in use in the United States may exceed 500,000, with the cumulative excess NOx emissions generating external health costs of more than $3 billion per year.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/6/2026
First Seen
Valid until: 10/4/2026(expired)
Sources
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