EPA proposes weakening heavy-duty truck pollution rules
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Additionally, the current set of rules requires truck engines to automatically operate at reduced power if their emissions reduction systems aren't working, which truckers and other heavy-duty vehicle operators have called disruptive. The EPA proposes getting rid of that requirement altogether and replacing it with an alert to drivers.

According to the EPA's analysis, the changes would save the trucking industry between $4,130 and $6,152 per diesel engine affected. Compared to the current emissions rules, the change would increase ozone-forming nitrogen oxide pollution from heavy duty trucks by 4.2% in 2030 and by 11.6% by 2055.

The EPA did not model the resulting effect on air quality or human health, but noted that the modifications would likely reduce the benefits of prior rules changes in 2023.

The proposal is now open for a period of public comment .

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