RELATIONSHIP OF PARTICULATE MATTER RETRIEVED FROM SATELLITE AND GROUND MEASUREMENTS IN NORTHERN THAILAND
DOI:
https://doi.org/10.14456/jem.2022.5Keywords:
Aerosol optical depth (AOD), PM2.5, PM10, Satellite, VIIRSAbstract
Aerosol Optical Depth (AOD) data from the Suomi-NPP VIIRS satellite were analyzed for their relationship to particulate matter (PM), including particulate matter with diameter of less than 2.5 microns (PM2.5) and particulate matter with diameter of less than 10 microns (PM10) from the ground air quality monitoring station of the Pollution Control Department of Thailand. The study was divided into 2 parts. The first part was a comparison of extracting AOD data from 6 different area sizes. The analysis of the relationship between AOD-PM found that the area size 0.5ºx0.5º and 0.2ºx0.2º had the Correlation Coefficient (R) is the highest. The second part is the development of a model to predict the PM value by considering the meteorological factors such as Relative Humidity (RH), Temperature (T) and Wind speed (WS). It was found that Relative Humidity was the most important variable for predicting PM values. It analyzes the relationship between Estimated PM (predicted PM value with model equations) and Observed PM (actual measured PM). It was found that Estimated PM2.5 - Observed PM2.5 and Estimated PM10 - Observed PM10 had R values in the range of 0.47-0.81 and 0.62-0.81 respectively, with root mean squared error (RMSE) for predictions in the range of 13.60 - 55.43 µg. /m³ and 19.38 - 33.95 µg/m³ respectively
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