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Unfortunately EPA and CARB exhaust emissions are measured in parts per million at the exhaust port, not in milligrams emitted per vehicle mile traveled. That's why Aptera wasn't able to get a small diesel motor certified in CA, since they couldn't find one that had a low enough ppm at the exhaust. But Ford had no problems certifying its powerstroke diesel pickup trucks in CA. Guess which vehicle would be spitting out more pollutants per mile traveled down the road. Its a case of penny wise and pound foolish.
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