Actually in my area, I see quite a number of hydrogen fuel cell vehicles. There's a hydrogen fuel cell pump near where I live in South Pasadena:
Photo by me, taken January 2021
Here's a hydrogen fuel cell vehicle, a previous generation Toyota Mirai, a picture I took in my area in June 2021:
Photo by me
It'd be great if they became more common; it doesn't take long to refuel a hydrogen fuel cell vehicle, it's just like gassing up an ICE car. If you've ever driven behind a Toyota Mirai, though, they sometimes spray water from their tailpipe. It's pissed me off driving behind one after I just had my car washed, and then I get sprayed with water from one. It's like, why don't they design them so that the water exhaust pipe doesn't spray from the back of the vehicle? Why doesn't the drain pipe let out the water from the bottom center of the car instead?
Here's a map of hydrogen fuel stations in California:
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