This study aims to analyse fire hotspots using two NASA’s sensor systems; Moderate Resolution
Imaging Spectroradiometer (MODIS), and Visible Infrared Imaging Radiometer Suite (VIIRS)
and assess their impacts on air quality. Geographic information system (GIS) was used to create
maps of fire hotspots and their density. The Hybrid Single Particle Lagrangian Integrated Trajectory
(HYSPLIT) model was used to analyze 24- and 72-hour backward trajectory (BWT) of air mass
movement to Chiang Mai city during February-April 2018. Two levels of air mass arriving were
set at 10 m and 1,500 m above ground level (AGL). During the study period, directions of air
mass movement were mostly from western and south-western of the city. Burned areas obtained
from both MODIS and VIIRS systems were significantly different (p < 0.05). Correlations between
PM2.5 concentrations and Burned areas for both 24-and 72-hour BWT obtained from VIIRS were
better than those of MODIS at both levels (10 and 1,500 m AGL). Influence of local open burning
on air pollution was observed from both systems but VIIRS provided slightly higher correlation
with hotspot number than MODIS. Both systems provided similar results for transboundary air
pollution (1,500 m AGL).
Keywords
Fire Hotspot, Backward Trajectory, Air pollution, PM2.5, Open burning
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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