Controls on concentrations and clumped isotopologues of vehicle exhaust methane.

ABSTRACT: Methane emissions from vehicle exhaust, as a source of methane, are often overlooked. However, in areas with high vehicle activity, the emissions can be substantial. There is a notable lack of characterization regarding the variable concentrations and isotopic signatures of methane in vehicle exhaust. This gap in knowledge limits our understanding of the mechanisms of methane production in vehicles and the factors controlling concentration variations and isotopic fractionation, which also makes it difficult to identify and reduce methane emissions from vehicle exhaust. This study characterized the methane concentration ([CH4]), methane-to-ethane ratio (C2:C1), methane carbon and hydrogen isotopes (δ13C and δD), and methane clumped isotopologues (Δ13CH3D and Δ12CH2D2) of the vehicle exhaust

SUBMITTER: Sun J 

PROVIDER: S-EPMC11844870 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature