HCNG
HCNG or H2CNG (hydrogen compressed natural gas) is a mixture of compressed natural gas and 4–9 percent hydrogen by energy.[1] It may be used as a fuel gas for internal combustion engines[2][3][4] and home appliances.
(regarding the acronyms in the above emissions chart:
AVL = Average Levels?
CNG = Compressed Natural Gas
HCNG = Hydrogen and CNG blend
NOX = Nitrogen Oxides
NMHC = Non-Methane Hydrocarbons?
CH4 = Methane
THC = Total Hydrocarbons?
CO = Carbon Monoxide)
HCNG dispensers can be found at Hynor (Norway) Thousand palms and Barstow,[5] California, Fort Collins, Colorado (all US), Chongqing[6] and Shanxi (China),[7][8] Pico Truncado (Argentina),[9] Islamabad (Pakistan),[10][11] Dunkerque (France),[12][13] Gothenburg Sweden, Rio de Janeiro[14] (Brazil), Emilia-Romagna,[15][16] Lombardia[17][18] (Italy), Dwarka and Faridabad (Delhi), India[19][20][21] and the BC hydrogen highway in Canada.
HCNG for mobile use is premixed at the hydrogen station.