Dr Ben Lane has told talkRADIO a recent study into eco-friendly car emissions "may be wrong."
The research, published in the Atmospheric Environment journal, found green car emissions were higher than the exhaust fumes released by other types of cars, mainly due to the weight of of eco-friendly car batteries, which make the tyres and brakes wear quicker and produce increased pollution particulates.
Lane is the managing editor of the Next Green Car website, which advises consumers on economical cars, and he disagrees with the results.
"We [Next Green Car] crunched some numbers and, in the UK they [eco-friendly vehicles] are only slightly heavier [than conventional cars]," he told Julia Hartley-Brewer. "Probably only 10-15 per cent heavier. This actually means they are cleaner on the road."
Lane believes over time we will own more electric and hybrid cars.
"I think it's most likely by 2040 to 2050, a third of cars will be fully battery electric," he added. "Maybe two-thirds will be plug-in hybrids.
"You can have an electric car running on wind or solar energy, so overall electric cars can be much cleaner."