California Air Resources Board
National Forest
The Forest Service is under Federal rules and not CARB rules, I don't think their trucks even have to be CARB legal. You are mistaking CARB restrictions on commercial vehicles and items the average citizen uses. Anything sold in California that was legal at the time is still legal now. My 1960 Ford is still legal and so are WW2 era Jerry cans because they were bought or brought into the state legally. Same with a diesel truck owned by a resident, it does not have to meet current CARB standards unless it is used commercially. DMV stops registration of big commercial trucks only, pickups aren't included because CA recognizes that people have a right to keep and operate their personal vehicles. The rules are complicated but that doesn't mean they are impossible to understand and I don't mean to argue the point but it doesn't help anybody saying that gas cans are some sort of problem here, they aren't.