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California Air Resources Board Information and Links

California Air Resources Board
website home page is a good start place for all the info.
CARB Home Page.
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PERP “Portable Equipment Registration Program” home page:
This is for any engine mounted on a trailer, like a chipper or stump grinder.
PERP Home Page.

Here’s a PERP FAQ sheet with lots of answers to your questions.
PERP Question and Answers.
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The Truckstop is the CARB page for on-road diesel truck regulations. It gets pretty complicated so take your time and read it carefully.
The TRUCKSTOP.

On-road diesel truck compliance changed some on March 7 2014. Here are some of those changes.

TRUCK FAQ SHEET.