What is the correct sequence, from minimum to maximum, of soot emissions from vehicles running on different types of fuels?

A. CNG fuelled vehicle

B. Petrol fuelled vehicle

C. Diesel fuelled vehicle

D. Hydrogen energy fuelled vehicles

Choose the correct answer from the options given below:

The correct answer is - D, A, B, C

Key Points

• Soot Emissions
  • Vehicles running on different types of fuels emit varying amounts of soot, which is a key factor in air pollution.
• Hydrogen Energy Fuelled Vehicles
  • These vehicles have negligible soot emissions as they produce only water as a byproduct.
• CNG Fuelled Vehicles
  • Compressed Natural Gas (CNG) vehicles emit very low amounts of soot compared to petrol and diesel vehicles.
• Petrol Fuelled Vehicles
  • These vehicles emit moderate amounts of soot, higher than CNG but lower than diesel vehicles.
• Diesel Fuelled Vehicles
  • Diesel vehicles are known for their high soot emissions, contributing significantly to air pollution.

Additional Information

• Environmental Impact
  • Hydrogen energy is considered a clean energy source with zero emissions of greenhouse gases or pollutants.
  • CNG burns more cleanly than petrol and diesel, producing fewer pollutants, including soot.
  • Petrol engines emit a mix of pollutants, including particulate matter (soot), but generally less than diesel engines.
  • Diesel engines emit higher levels of nitrogen oxides (NOx) and particulate matter (soot), which are harmful to human health and the environment.
• Regulatory Standards
  • Emission standards for vehicles are set by government agencies to limit the amount of pollutants, including soot, that vehicles can emit.
  • Advancements in technology, such as Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR), are used to reduce soot emissions from diesel engines.