The only market in the USA for NG vehicles is Medium and Heavy Duty. Companies with deep pockets and set routes like FedEx and UPS have made it work but you need to do a LOT of miles toget the fuel savings required to pay back spending tens of thousands more for the truck
Hydrogen fuel cells have no NOX emissions. Combustion H2 really isn't worth discussing due to the horrendous efficiency. You need roughly 5x more electricity per mile for an ICE H2 truck vs battery electric.
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