In use, on average, this equates to around 200g CO₂/km for petrol and 120g CO₂/km for diesel. So, while diesel fuel contains slightly more carbon (2.68kg CO₂/litre) than petrol (2.31kg CO₂/litre), overall CO₂ emissions of a diesel car tend to be lower. A further three were ranked B - from 0.08 to 0.12 and inside the EU’s 2021 tolerances. Cleaned up their act: New Volkswagen cars are the least polluting on average compared to other mainstream brands, fresh research has revealed. Our pick 1.5 TDCI 85PS Latest Ford Fiesta deals from £4,750 Monthly finance from £91 CO2 emissions 82g/km Fuel economy 74.3mpg. Small cars and diesel engines are an increasingly rare combination. Some modern cars are emitting 25 times the legal levels of harmful pollutants into the atmosphere, according to a new report. Both these engines – Diesel and Gas – contaminate the ecology in some way or the other. Get short URL. The Government has, however, promised to look at the appropriate ‘tax treatment’ of diesels in November’s Budget, so there remains a question mark over how newer diesels might be impacted by this. In the short term at least, drivers of Euro 6 diesel cars should be exempt from any charges or restrictions as a result of clean air zones. Nine more scored C grades (0.12-0.18) – only good enough for the EU’s allowed limits up to 2019. Volkswagen least polluting diesel car brand in Europe, study shows 19 Sep, 2016 14:36 . So, to help you figure out the answer, let’s explore diesel vs. gas pollution more profoundly. Diesel vs. Gas Pollution: Everything you Need to Know! For most cars built over the past 20 years that may still be in use, petrol is likely to be less polluting overall than diesel. has revealed the worst diesel cars for air pollution. Diesel emissions testing carried out by Which? Car makers are slimming down their models ranges, arguing that consumer demand and efficiency improvements in petrol engines mean there’s no longer the need for diesel in small cars. But the question is which is more polluting – diesel or gas? Despite 1.2m UK-based Euro5 emissions diesel … Tests conducted on 61 new diesel …