Question

In what way, the use of CNG as an automobile fuel has brought down the pollution level ?​

Answer 1

CNG produces harmful particles in the air in less quantity but other fuels such as petroleum and diesel release the many harmful particles in the air with the gas of carbon monoxide. The use of CNG gas in the vehicles can reduce the pollution levels on the earth because these are cleaner gases.

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Answer 2

Compressed natural gas is a fuel that can be used in place of gasoline, diesel fuel and liquefied petroleum gas (LPG). CNG combustion produces fewer undesirable gases than the aforementioned fuels. CNG is made by compressing natural gas, which is mainly composed of methane (CH₄), to less than 1% of the volume it occupies at standard atmospheric pressure.

• CNG emits significantly less pollution directly than gasoline or oil when combusted (e.g., unburned hydrocarbons (UHC), carbon monoxide (CO), nitrogen oxides (NOₓ), sulfur oxides (SOₓ) and PM (particulate matter)). For example, an engine running on petrol for 100 km produces 22 kilograms of CO ₂, while covering the same distance on CNG emits only 16.3 kilograms of CO ₂

• The lifecycle greenhouse gas emissions for CNG compressed from California's pipeline natural gas is given a value of 67.70 grams of CO₂-equivalent per megajoule (g CO₂ e/MJ) by CARB (the California Air Resources Board), approximately 28 percent lower than the average gasoline fuel in that market (95.86 g CO₂ e/MJ).

• CNG produced from landfill biogas was found by CARB to have the lowest greenhouse gas emissions of any fuel analyzed, with a value of 11.26 g CO2e/MJ (more than 88 percent lower than conventional gasoline) in the low-carbon fuel standard that went into effect on January 12, 2010.

• Due to lower carbon dioxide emissions, switching to CNG can help mitigate greenhouse gas emissions. However, natural gas leaks (both in the direct use and in the production and delivery of the fuel) represent an increase in greenhouse gas emissions. The ability of CNG to reduce greenhouse gas emissions over the entire fuel lifecycle will depend on the source of the natural gas and the fuel it is replacing.

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