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July 11, 2026npj Clean AirOpen Access

Observational insights into the relationship between boundary layer evolution and new particle formation

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Authors

HHHancheng HuYZYidan ZhangYLYuting Li

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Overview

Observational insights demonstrate the impact of boundary layer height on new particle formation and survival in urban areas.

Key Points

  • To investigate how planetary boundary layer height (PBLH) affects new particle formation (NPF) and particle survival in urban environments.
  • Analyzed particle number size distributions and PBLH observations across three cities: Beijing, Guangzhou, and Shanghai.
  • Examined 71, 14, and 10 NPF events in each city, classifying events based on timing relative to PBLH development.
  • Utilized 48-hour backward trajectories to understand the dynamics influencing NPF events.
  • PBLH was negatively associated with survival parameter P, with R² values of 0.21 in Beijing, 0.024 in Guangzhou, and 0.99 in Shanghai.
  • The strength of the relationship between PBLH and particle survival varied among cities, indicating localized effects.
  • Classified events into three types based on the timing of particle formation, showing distinct behavior related to PBLH development.

Cite This Study

Hu et al. (2026) studied this question.

synapsesocial.com/papers/6a51de38c18d7f28ca5002a7https://doi.org/10.1038/s44407-026-00090-5
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