CNG CNG Environmental and Economic Benefits 2

Question 1

CNG produces lower levels of which air pollutant, making it preferred in urban areas with smog concerns?

Accepted Answer

Nitrogen oxides (NOx)

Answer

Sulfur hexafluoride (SF6)

Answer

Chlorofluorocarbons (CFCs)

Answer

Ozone (O3)

Question 2

What is the primary domestic source of natural gas used for CNG fuel in the United States?

Accepted Answer

Shale gas extraction (hydraulic fracturing)

Answer

Coal gasification

Answer

Imported liquefied natural gas (LNG)

Answer

Biomass fermentation only

Question 3

Renewable Natural Gas (RNG) used as CNG fuel is typically sourced from which waste stream?

Accepted Answer

Landfill biogas and wastewater treatment plants

Answer

Coal mines

Answer

Nuclear power plant cooling systems

Answer

Industrial chemical plants

Question 4

Which CNG emission benefit makes it particularly attractive for fleet operators subject to EPA's National Ambient Air Quality Standards (NAAQS) compliance zones?

Accepted Answer

Near-zero particulate matter and lower NOx emissions

Answer

Zero carbon dioxide output

Answer

No need for emission testing

Answer

Higher octane rating than diesel

Question 5

For a transit agency evaluating a switch from diesel to CNG buses, which total cost of ownership (TCO) factor most commonly offsets higher vehicle purchase prices?

Accepted Answer

Lower fuel cost per mile over the vehicle's lifetime

Answer

Reduced driver training requirements

Answer

Lower insurance premiums

Answer

Shorter maintenance intervals

Question 6

Which carbon accounting standard allows fleet operators to claim carbon-negative status when using RNG-sourced CNG?

Accepted Answer

EPA's Renewable Fuel Standard (RFS) pathway credits

Answer

ISO 14001 environmental management

Answer

OSHA Hazard Communication Standard

Answer

DOT Hazardous Materials Regulations