Opel-Vauxhall also fared badly with emissions found to be 10 times higher than permitted levels. A year after the " Dieselgate " scandal involving Volkwagen , new research has shown that all the major diesel car brands , including Vauxhall , Fiat and Suzuki , are selling models emitting far higher levels of pollution than VW . The Transport & Environment ( T&E ) study found that no brands comply with the latest " Euro 6 " air pollution limits when driven on the road . T&E evaluated emissions from data from around 230 diesel car manufacturers and ranked the worst brands according to emissions in real - world driving conditions . Fiat and Suzuki topped the list with emissions 15 times the Nox limit .
A year after the " Dieselgate " scandal involving Volkwagen , new research has shown that all the major diesel car brands , including Vauxhall , Fiat and Suzuki , are selling models emitting far higher levels of pollution than VW . The Transport & Environment ( T&E ) study found that no brands comply with the latest " Euro 6 " air pollution limits when driven on the road . T&E evaluated emissions from data from around 230 diesel car manufacturers and ranked the worst brands according to emissions in real - world driving conditions . Fiat and Suzuki topped the list with emissions 15 times the Nox limit .