Of the tens of thousands of notices issued by the California Department of Motor Vehicles (DMV) for trucks with expiring registrations this month, around 4,000 informed owners their vehicles were noncompliantwithstate air quality regulations and therefore could not be registered.
The registration holds reflected a law that took effect January 2020 requiring trucks to complywith the Truck & Bus Rule, the state's key regulation governing diesel emissions, or be subject to DMV restrictions.
The rule's phased-in requirements mandated heavy-duty commercial vehicles meet particulate matter filter requirements beginning Jan. 1, 2012. Older heavier trucks had to be replaced starting Jan. 1, 2015.
All told, about 420,000 heavy duty trucks are registered with the California …
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