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Atmospheric Drivers of PM2.5 Variability: Relative Humidity and Rainfall Influence in Tha Sala, Nakhon Si Thammarat Province
Organization(s):Srithammaratsuksa School
Country:Thailand
Student(s):Thammasron Preecha, Chayakorn Naosuwan, Thiraphat Hamtanon,
Pongpipat Thammatiwat, Noppakao Muanjit, Sirawit Chukom, Phacharakon Thammathon, Waransiri Kotcharat, Napatsorn Senapong, Piyangkul Maipum, Pasid Yingyong,
Thanakorn Rittichai, Nattawat Pume, Nattayod Intanop, Phanuwit Pattanakit, Tanya Hedsen, Phanuwat Lekprayun, Nakarin Suwan, Piyaporn Maikaew,Punyisa Sangchum, Pannaporn Suthijaroen
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Member(s):Patipon Thawornnuwong
Contributors:Mr. Thanongchai Makchit, Miss Auksarapuk Tempachana,Assoc.Prof.Dr.Krisanadej Jaorensutasinee, Assoc.Prof.Dr.Mullica Jaroensutasinee, Miss Chonthicha Khongthong, Mr. Tiwakorn Yoawa
Report Type(s):Virtual Science Symposium Report
Protocols:Air Temperature, Clouds, Precipitation
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Language(s):English
Date Submitted:2025-12-16
This study compares the effects of relative humidity (RH%) and rainfall on ambient particulate matter (PM2.5) concentrations. While rainfall cleanses the atmosphere via wet deposition, high RH% can increase PM2.5 concentration through hygroscopic growth and secondary aerosol formation. Data were analyzed across three distinct Nakhon Si Thammarat sites: an educational zone, a high-density urban area, and a suburban/rural village. Results confirm that rainfall is the primary mechanism for PM2.5 removal across all environments. Conversely, a significant positive correlation was observed between RH% and PM2.5 (due to formation/growth), particularly in urban areas. The findings quantify the differential meteorological control over air quality and emphasize the necessity of site-specific data for accurate PM2.5 forecasting and policy development.