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<p>Methylsiloxanes (MSs) are anthropogenic substances that do not occur naturally, and most studies have focused on their presence in indoor environments. To date, there is limited information regarding their prevalence in road dust across broad geographical scales, with even fewer studies identifying the sources of MSs. This research investigates the levels, regional distributions, and potential origins of MSs in road dust collected from major cities throughout China. The results indicate that these chemicals are prevalent in road dust, with total concentrations of the target MSs ranging from 6.36 to 8618 ng/g dw. Tetradecamethylcycloheptasiloxane was identified as the dominant methylsiloxane. Spatial variations were primarily associated with traffic flow, the value added by the secondary industry, and local population density. Principal component analysis combined with multiple linear regression and positive matrix factorization revealed that vehicle emissions (41.8%–42.3%), industrial activities (38.9%–47.2%), and the use of personal care and consumer products (11.0%–18.8%) were the major contributors to MSs in road dust. The overall source contributions identified by both methods were consistent. These findings highlight the significant role of vehicle emissions and industrial activities and provide valuable insights for developing policies aimed at managing MSs in urban areas.</p>

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Vehicle emissions and industrial activities as major sources of methylsiloxanes in urban road dust: a nationwide study in China

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Fei Zhang,
  • Xinru Luo,
  • Haoran Niu,
  • Anping Zhang,
  • Xianfa Su,
  • Jianhui Sun,
  • Jing Han,
  • Shujie Guo,
  • Shuying Dong,
  • Zhenwu Tang,
  • Jinglan Feng

摘要

Methylsiloxanes (MSs) are anthropogenic substances that do not occur naturally, and most studies have focused on their presence in indoor environments. To date, there is limited information regarding their prevalence in road dust across broad geographical scales, with even fewer studies identifying the sources of MSs. This research investigates the levels, regional distributions, and potential origins of MSs in road dust collected from major cities throughout China. The results indicate that these chemicals are prevalent in road dust, with total concentrations of the target MSs ranging from 6.36 to 8618 ng/g dw. Tetradecamethylcycloheptasiloxane was identified as the dominant methylsiloxane. Spatial variations were primarily associated with traffic flow, the value added by the secondary industry, and local population density. Principal component analysis combined with multiple linear regression and positive matrix factorization revealed that vehicle emissions (41.8%–42.3%), industrial activities (38.9%–47.2%), and the use of personal care and consumer products (11.0%–18.8%) were the major contributors to MSs in road dust. The overall source contributions identified by both methods were consistent. These findings highlight the significant role of vehicle emissions and industrial activities and provide valuable insights for developing policies aimed at managing MSs in urban areas.