Fig. 2From: Toxicological evaluation of exhaust emissions from light-duty vehicles using different fuel alternatives in sub-freezing conditionsOxidative potential measured with DTT assay from the PM samples of one Euro 2 and four Euro 6 cars. Results are shown as DTT rate of loss per km (μM/min− 1 km− 1). Results from Euro 2 car are marked with darker grey compared to the Euro 6 resultsBack to article page