Burning LPG reduces carbon dioxide (CO₂) emissions into the air by approximately 10%. According to the type of vehicle and system installed, it significantly reduces carbon monoxide (CO), nitrogen oxide (NO_X) and hydrocarbon (HC) emissions.  Furthermore LPG-fuelled vehicles produce no PM₁₀ and considerably reduce certain exhaust gas components for which the law does not impose any limits, such as benzene (C₆H₆), formaldehyde (HCHO) and other very aggressive and carcinogenic substances such as polycyclic aromatic hydrocarbons (PAH).

CNG reduces CO₂ emissions by about 20% and decreases carbon monoxide (CO) and nitrogen oxide (NO_X) emissions. CNG-fuelled cars do not produce PM₁₀, which is one of the major causes of air pollution in urban areas. They also emit lower amounts of other pollutants in their exhaust gases, such as benzene (C₆H₆), formaldehyde (HCHO) and other very aggressive and carcinogenic substances such as polycyclic aromatic hydrocarbons (PAH). By opting for CNG instead of petrol or diesel, less summer smog is produced along with the associated ozone (O₃).

The benefits of gaseous fuels compared to conventional fuels are not just evident from the environmental point of view, but most of all on the health front.

In the event of number plate or other restrictions on traffic, vehicles with LPG/CNG-fuelled engines are generally acknowledged to be ecological by virtue of their low pollutant emissions and allowed to move freely in almost any city. However you are advised to check the terms of the ordinance each time.