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The pipeline, with a diameter of 508mm and a distance of 25km, starts at the hydrogen generation station at the Jiyuan Industrial Park and ends at Luoyang Petrochem complex in the Jili district.

The working pressure of the pipeline is 4 MPa, and it is capable of delivering more than 10,000 tonens of hydrogen every year.

The company also noted that due to the mountainous and steep geography along the route of the pipeline, many obstacles have to be overcome, including the need for tunnelling and crossing railway lines and highways.

25km of hydrogen pipeline constructed in China | News | gasworld

The article did not say how they got around the problem of hydrogen embrittlement. Perhaps, they just painted to separate hydrogen frim the metal pipe.

Meet First Toyota's First Mirai Owner - And His Half-Filled Fuel Cell Vehicle

Even on coal based electricity it would seem;
Electric vehicles beat gasoline cars in cradle-to-grave emissions study - LA Times

Although the study is not posted in the article, it seems to be based on everything from manufacturing to recycling - but it isn't mentioned whether there's accounting for the substantial ratio of home charged ev's - which would even further make the environmental point. But the article does go so far as to sum up in this fashion;
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