Measurement of Aerosol Size Distribution in an Urban Park; a Case Study of Chulalongkorn Centenary Park in Bangkok, Thailand

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Zwe Htet Aung
Win Trivitayanurak


This study investigated the particle size distribution (PSD) in the Chulalongkorn University Centenary Park, an urban park in Bangkok.  Two continuous 7-day measurements were conducted during February to March 2023 by employing the Scanning Mobility Particle Sizer (SMPS) and the Optical Particle Sizer (OPS) to measure in the range of 10 – 10,000 nm. Observed PM2.5 concentrations and local meteorological parameters were gathered for analysis.  Ultrafine-mode concentrations exhibit diurnal pattern correlating with the traffic rush hours in the morning and in the evening.  The statistics of geometric mean diameter also indicate minimum values twice daily in the morning and evening rush hours indicating the behavior of freshly emitted particles and subsequent growth. The number concentrations were significantly lower during the daytime than at nighttime highlighting the nighttime meteorological influence. The lumped number concentrations of particles larger than 80 nm (N80) correlates well with PM2.5 data. Comparing between the two-measurement period, higher humidity is related to overall larger sizes that could be indicative of hygroscopic growth.  Size distributions at chosen periods are presented to highlight the various influences of primary particle emission and microphysical processes.  This work provides new information of the level of ultrafine particles that urban dwellers are exposed to in an urban park.

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