Related Experiment Video
Updated: Aug 19, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Emissions of Volatile Methyl Siloxanes (VMS) from Vehicles
Yanfang Chen1, Yuantao Wang1, Siyao Yue1
1PSI Center for Energy and Environmental Sciences, Paul Scherrer Institute (PSI), Villigen 5232, Switzerland.
None:
Volatile methyl siloxanes (VMS) are anthropogenic compounds widely used in personal care products and industrial applications and are frequently detected at elevated concentrations in urban air. However, their sources in urban areas remain poorly constrained. Here, we use chassis dynamometer experiments to quantify gas-phase VMS emissions from a range of on-road vehicles, including light-duty gasoline and diesel vehicles. Hexamethylcyclotrisiloxane (D3) dominated the emitted VMS, over octamethylcyclotetrasiloxane (D4), and decamethylcyclopentasiloxane (D5). VMS emissions increased with driving speed and were substantially higher from gasoline than from diesel vehicles. Comparison with tunnel measurements showing elevated ambient VMS concentrations supports a significant contribution from traffic-related sources, including tailpipe and potentially nontailpipe emissions. These results identify vehicular emissions as a previously underrecognized source of VMS near highways, and provide new constraints for their atmospheric budget and source apportionment.
More Related Videos
08:59Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
Published on: May 22, 2020
07:24Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
Published on: February 19, 2018
Related Concept Videos
Carboxylic Acids to Methylesters: Alkylation using Diazomethane
Preparation and Reactions of Sulfides
Volatilization
Multiple Halogenation of Methyl Ketones: Haloform Reaction
Solvents
A...
Autoxidation of Ethers to Peroxides and Hydroperoxides