Shift toward a fine-particle-dominant regime at an urban roadside station in Seoul: comparative analysis of PM concentrations and traffic influence between pandemic (2021) and post-pandemic (2024) eras

Sungho Hwang

doi:10.1016/j.apr.2026.103117

Shift toward a fine-particle-dominant regime at an urban roadside station in Seoul: comparative analysis of PM concentrations and traffic influence between pandemic (2021) and post-pandemic (2024) eras

2026-06-22

0

PRE

AI

S

Sungho Hwang *

DOI：10.1016/j.apr.2026.103117

Original

Original request for help

Save

Abstract

En 中文

• Roadside PM2.5 levels in Seoul increased significantly (22%) in 2024, while PM10 remained stable. • A pronounced 33% rise in median PM2.5 occurred during evening commutes due to recovered traffic and boundary layer stability. • Structural ratio transition: The PM2.5/ PM10 ratio baseline shifted upward, consistently exceeding 0.50 during high-vulnerability peak hours. • Decoupling of traffic and PM: Weakened correlations suggest that urban congestion and street canyon vortices now govern the "new normal" air quality.

Shift toward a fine-particle-dominant regime at an urban roadside station in Seoul: comparative analysis of PM concentrations and traffic influence between pandemic (2021) and post-pandemic (2024) eras

Abstract

Journal

Organization

Cited Papers

Citing Papers