Contrasting Summertime Trends in Vehicle Combustion Efficiency in Los Angeles, CA and Salt Lake City, UT.

ABSTRACT: Policy interventions and technological advances are mitigating emissions of air pollutants from motor vehicles. As a result, vehicle fleets are expected to progressively combust fuel more efficiently, with a declining ratio of carbon monoxide to carbon dioxide (CO/CO₂) in their emissions. We assess trends in traffic combustion efficiency in Los Angeles (LA) and Salt Lake City (SLC) by measuring changes in summertime on-road CO/CO₂ between 2013 and 2021 using mobile observations. Our data show a reduction in CO/CO₂ in LA, indicating an improvement in combustion efficiency that likely resulted from stringent regulation of CO emissions. In contrast, we observed an increase in CO/CO₂ values in SLC. While slower progress in SLC compared to LA may be p

SUBMITTER: Yanez CC 

PROVIDER: S-EPMC11755713 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature