How is CNG a clean fuel?

“Go CNG, Go Green” is a phrase often heard when discussing cleaner energy alternatives. With growing concerns about air pollution, climate change, and stricter environmental regulations, industries and consumers are shifting toward fuels that produce fewer emissions.

One such widely adopted alternative is Compressed Natural Gas (CNG). CNG is considered a low-emission transport fuel and is increasingly used in cars, taxis, and public transport buses across India.

CNG is a fossil fuel primarily made of methane which is compressed to nearly 1% of the total volume it occupies at regular atmospheric pressure. It is widely used as a transport fuel to power passenger cars and public transportation like buses. Besides its use in automobiles, CNG is also used in cooking. The supply is ensured via a CNG gas connection.

Reports on CNG stations in India reveal that as of May 2021, Gujarat had the highest number of CNG stations (794), followed by Maharashtra (461) and Uttar Pradesh (455). Collectively, India had 3,180 CNG stations at the time of the study - reflecting the growing demand for cleaner automotive fuels.

Why is CNG considered a clean fuel?

CNG is considered a clean fuel because it produces lower levels of carbon dioxide, nitrogen oxides, and particulate emissions compared to petrol and diesel. Since it is mainly composed of methane, it burns more efficiently and releases fewer harmful pollutants. This helps reduce air pollution and greenhouse gas emissions in cities, making CNG a cleaner fuel option.

CNG is popular for its low emission rates and other eco-friendly benefits. Although it benefits all industries, it is especially significant in the automobile sector where fuel emissions directly impact air quality. Many people ask: why is natural gas called a clean fuel or does CNG cause pollution? The following are the reasons why CNG is called a clean fuel for vehicles:

• Natural gas is typically a product of decaying organic matter. The hydrogen in the composition releases energy, leaving behind only water as a residue.

• CNG mixes easily and evenly in the air since it is a gaseous fuel. Furthermore, it leaves no residue. 

• CNG creates comparatively less pollution than oil or petrol during combustion. For instance, when an engine runs on gasoline for 100 kilometers, it releases 22 kilograms of CO2. However, when it runs on compressed natural gas, it emits approximately 16.3 kilos. 

• The nitrogen oxide and soot emissions in CNG-powered vehicles are comparatively lesser in vehicles running on diesel. 

• Vehicles powered by CNG are more beneficial to the environment as compared to vehicles running on electricity. Electric vehicles draw their electricity from the national grid, which adds to the system's overall greenhouse gas emissions. 

• Compressed Natural Gas emits approximately 6 to 11% lower levels of greenhouse gases in comparison to petrol or diesel. 

• The amount of carbon dioxide generated by burning coal is roughly 50% more than that produced by CNG. 

• It substantially improves the local air quality and reduces harmful particulate emissions.

CNG vs Petrol vs Diesel Emissions – Which is the Cleanest Fuel?

Refer to the table below for clarity on CNG vs Petrol vs Diesel emissions:

Fuel Type	Carbon Emissions	Air Pollution Level	Cost Efficiency
CNG	Lower CO₂ emissions	Very low particulate matter	High
Petrol	Moderate CO₂ emissions	Moderate pollution	Medium
Diesel	Higher NOx and particulate emissions	High pollution	Medium

This comparison clearly shows which fuel type reduces emission pollution more effectively, making CNG a preferred alternative and cleanest fuel for vehicles. 

Also read about CNG vs Traditional Fuelling.

Is CNG the Near Future?

Natural gas utilization in transportation can improve energy security. It will further reduce dependency on expensive crude oil imports, especially for nations with sizable gas deposits but little to no oil reserves. As per reports, India is the 3rd largest consumer and importer of oil globally. It is 85.5 percent dependent on these imports to meet its needs. 

The use of CNG is bound to increase soon as natural gas production in India consistently rises. India's Hydrocarbon vision statement envisages natural gas’s share to account for around 25% by 2025. 

The automobile industry, one of the biggest industries affected by CNG, is also making adjustments to meet the demand for fuel-efficient and low-emission CNG vehicles in India. The domestic sales of CNG-powered vehicles have doubled, driving automobile companies that haven’t yet launched CNG-powered vehicles to enter the space.

As far as the CNG price is concerned, the running cost of CNG is approximately INR 2.1 per/km. In contrast, the running cost for petrol works out to INR 5 per/km, making CNG a cost-effective and environment friendly fuel alternative.

Read more about how CNG saves money.

It will not come as a surprise to see a rise in CNG stations around you on searching “CNG station near me” as India expects to have a total of 10,000 CNG stations in 330 cities in the next two years. 

FAQs

1. Why is CNG called a clean fuel?

CNG is called a clean fuel because it burns more completely than petrol or diesel and produces lower levels of carbon dioxide, nitrogen oxides, and particulate matter, helping reduce air pollution.

2. Does CNG cause pollution?

While no fuel is completely pollution-free, CNG causes significantly less pollution compared to petrol and diesel, making it one of the cleaner fuels used in transportation.

3. Is CNG more polluting than petrol?

No, CNG is less polluting than petrol. It emits fewer greenhouse gases and significantly lower particulate emissions.

4. How has the use of CNG in automobiles reduced pollution in cities?

Many cities have introduced CNG buses, taxis, and auto-rickshaws, which has helped reduce smog, particulate matter, and harmful vehicle emissions.

5. Which fuel type reduces emission pollution the most?

Among conventional fuels, CNG produces lower emissions compared to petrol and diesel, making it one of the cleaner transportation fuels available today.

6. How does CNG help reduce air pollution?

CNG helps reduce air pollution because it burns more cleanly than petrol and diesel, producing lower carbon dioxide (CO₂), nitrogen oxides (NOx), and almost no particulate matter, which helps improve air quality and reduce vehicle emissions in cities.