Production of which pollutant gases that are emitted by use of CNG in vehicles is reduced when a more green fuel HCNG is used instead?

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SO2 and CO. Compressed Natural Gas (CNG) is methane (CH4) stored at high pressure. SO2 and CO are the pollutants gases that are emitted by use of CNG in vehicles. Hydrogen-enriched CNG (HCNG) is considered a cleaner source of fuel, as it reduces the amount of SO2 & CO emitted by CNG Vehicles.

Production of which pollutant gases that are emitted by use of CNG in vehicles is reduced when a more green fuel HCNG is used instead?

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