CNG-run engines release almost 80% less carbon monoxide when compared to diesel cars and 45% less carbon emissions those with petrol engines. With CNG vehicles exempt from the odd-even rule in the national capital, we expect demand for CNG car models to increase. Car makers like Maruti Suzuki, Hyundai, Tata Motors, and Honda have started the production of such cars, and we provide a list of the factory-fitted CNG models available in the market, for you to choose from.