Publication

Emissions of Volatile Methyl Siloxanes (VMS) from Vehicles

2026

Résumé

High Resolution Image Download MS PowerPoint Slide 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 (D 3 ) dominated the emitted VMS, over octamethylcyclotetrasiloxane (D 4 ), and decamethylcyclopentasiloxane (D 5 ). 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.

Source officielle

https://infoscience.epfl.ch/entities/publication/32903cd3-90ca-4ef3-a350-2a10ddd0bde0

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2026

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/32903cd3-90ca-4ef3-a350-2a10ddd0bde0

À propos de ce résultat

Concepts associés (32)

Vehicle emission standard

Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes. They are generally designed to achieve air quality standards and to protect human life. Different regions and countries have different standards for vehicle emissions. Many emissions standards focus on regulating pollutants released by automobiles (motor cars) and other powered vehicles.

United States vehicle emission standards

United States vehicle emission standards are set through a combination of legislative mandates enacted by Congress through Clean Air Act (CAA) amendments from 1970 onwards, and executive regulations managed nationally by the Environmental Protection Agency (EPA), and more recently along with the National Highway Traffic Safety Administration (NHTSA). These standard cover common motor vehicle air pollution, including carbon monoxide, nitrogen oxides, and particulate emissions, and newer versions have incorporated fuel economy standards.

Greenhouse gas emissions

Greenhouse gas emissions (abbreviated as GHG emissions) from human activities strengthen the greenhouse effect, contributing to climate change. Carbon dioxide (), from burning fossil fuels such as coal, oil, and natural gas, is one of the most important factors in causing climate change. The largest emitters are China followed by the US, although the United States has higher emissions per capita. The main producers fueling the emissions globally are large oil and gas companies.

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Emissions of Volatile Methyl Siloxanes (VMS) from Vehicles

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