Clean : Clean

Care about the environment? Using CNG means releasing less pollution into the air.

Natural gas vehicles (NGVs) can have a direct, positive impact on America’s air quality and environment – today. NGVs in urban environments are a solution for meeting the Environmental Protection Agency (EPA) non-attainment measures and improving local air quality.

Emissions Reduction in
Real Numbers

NGVs improve air quality through dramatic reductions in emissions, such as:

  • Reducing carbon dioxide (CO2) emissions by 20% to 30%
  • Reducing carbon monoxide (CO) emissions up to 75%
  • Reducing nitrogen oxide (NOx) emissions by approximately 50%
  • Reducing up to 95% of particle matter (PM) emissions
  • Reducing volatile organic compound (VOCs) emissions by 55%

Source: TIAX Report - Full Fuel Cycle Assessment: Well-To-Wheels Energy Inputs, Emissions, and Water Impacts, 08/2007 (Prepared for California Energy Commission).

Source: U.S. Dept. of Energy - Argonne National Laboratory Report: A Full Fuel-Cycle Analysis of Energy and Emissions Impacts of Transportation Fuels Produced from Natural Gas, 12/1999.

Energy efficiency of various alternative fuels

(Click on the graph below to enlarge.)

Energy efficiency of various alternative fuels 

Source: The Greenhouse Gases, Regulated Emissions and Energy Use in Transportation (GREET) Model 1.8b

 

Water intensity of transportation fuels

British Thermal Unit (BTU)/Mile
(Click on the graph below to enlarge.)

Total energy consumption of select alternative fuels 

Source: The Greenhouse Gases, Regulated Emissions and Energy Use in Transportation (GREET) Model 1.8b

 

In addition, alternative fuel vehicles such as CNGs produce little or no evaporative emissions (i.e. fumes) during fueling and use. In gasoline vehicles, evaporative and fueling emissions can account for at least 50% of a vehicle's total emissions.

Natural gas produces lower carbon dioxide (CO2) emissions per vehicle mile traveled. While CNG vehicles do emit methane, another principle greenhouse gas, any increase in methane emissions is more than offset by a substantial reduction in CO2 emissions compared to other fuels.

A recent study done on behalf of the California Energy Commission concludes that CNG vehicles produce up to 29% less greenhouse gas emissions than comparable gasoline vehicles and up to 22% less than comparable diesel vehicles.

Some vehicle fuels use water in processing their raw elements for usable energy. For example, although ethanol is billed as an environmentally friendly fuel, some forms of processing involve using large amounts of water to refine it into energy. Natural gas uses far less water when it is processed, versus other transportation fuels.

Water intensity of transportation fuels

(Click on the graph below to enlarge.)

Water intensity of transportation fuels 

The bottom line is that natural gas-powered vehicles are dramatically better for the environment than gasoline-powered vehicles.

Source: NGVC.org: Environmental Benefits of Natural Gas Vehicles. 

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“Vehicles (such as the Honda NGV) with a SULEV, PZEV or AT PZEV emissions rating emit only two pounds of hydrocarbons over 100,000 miles of driving – that's equivalent to spilling a pint of gasoline.”

- DriveClean.ca.gov