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June 26, 2026Environmental Science & Technology

Enhanced Secondary Organic Aerosol Formation in Humid Urban Air: The Evolution of Oxygenated Volatile Intermediates

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Authors

JDJing DuanLZLiyuan ZhouRHRu‐Jin Huang

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Overview

Randomized trial investigates elevated SOA in humid urban air, highlighting RH's significant impact on particle growth.

Key Points

  • This study aims to understand how relative humidity (RH) influences secondary organic aerosol (SOA) formation from volatile organic compounds (VOCs) in urban environments.
  • Investigated RH-dependent SOA formation using a field-deployable oxidation flow reactor (OFR).
  • Measured changes in particle number concentrations and organic aerosol mass under varying humidity conditions.
  • Examined multigenerational oxidation of VOC precursors and their transformation into oxygenated species.
  • Elevated RH resulted in nearly 5-fold higher organic aerosol (OA) mass growth compared to low-RH conditions under similar photochemical ages.
  • At 20-200 nm particle size range, there was a significant increase in particle number concentrations during high-RH oxidation.
  • The findings suggest concurrent influences of RH on VOC transformation and gas-particle partitioning of oxidized products.

Cite This Study

Duan et al. (2026) studied this question.

synapsesocial.com/papers/6a3e16cd030ad1a9b30908a3https://doi.org/10.1021/acs.est.5c18969
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