Home » Which of the following statements are true about CNG -Compressed natural gas? Water Pollution MCQs Which of the following statements are true about CNG -Compressed natural gas? September 21, 2022 24 Views Q. Which of the following statements are true about CNG -Compressed natural gas? It is a clean fuelIt is a harmful fuelIt is a polluting fuelAll of the above Answer: It is a clean fuel.