HCNG
Sign in to savethumb|HCNG -CNG emission HCNG or H2CNG (hydrogen compressed natural gas) is a mixture of compressed natural gas and 4–9 percent hydrogen by energy. It may be used as a fuel gas for internal combustion engines and home appliances.
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thumb|HCNG -CNG emission HCNG or H2CNG (hydrogen compressed natural gas) is a mixture of compressed natural gas and 4–9 percent hydrogen by energy. It may be used as a fuel gas for internal combustion engines and home appliances.
(regarding the acronyms in the above emissions chart:
Excerpted from Wikipedia’s “HCNG” article, available under the CC BY-SA 4.0 licence.