In the small chance you’re serious, because production of, transportation of, leakage of, and burning of gas, ng, or propane still pollutes. Hydrogen can technically technically be done cleanly but is still energy intensive, difficult to transport, difficult to store, difficult to distribute, difficult to store again in your car, and leaks along that whole path. It’s really not a good path. And for what purpose? So you can fill up in a few minutes (assuming the nozzle hasn’t frozen from use, look it up), forgetting that most people can charge their ev overnight meaning they start every day with a full tank.

BEVs and clean energy has a far, far easier and simpler path forward. Not to mention the development potential of batteries far exceeds that of hydrogen production (production only because there’s really not much that can be done for other parts).

If you want another solution it’s transit, ebikes, and trains.

I doubt I’m going to respond any further.