You are here: Home » Latest Issue » Volume 17, 2022 - Number 2 » HIGH-RESOLUTION SPATIAL SOLUTION FOR AIR QUALITY ASSESSMENT IN THE TROPICAL CITY OF HO CHI MINH CITY, VIETNAM, Carpathian Journal of Earth and Environmental Sciences August 2022, Vol. 17, No. 2, p. 275 – 286; DOI:10.26471/cjees/2022/017/221
Van TRAN THI1,2*, Bao HA DUONG XUAN1,2, Bao VO QUOC1,2, Phuong DINH THI KIM1,2 & Hieu NGUYEN TRINH DUC1,2
1Department of Environmental and Resources Information System, Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology, (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam; *Corresponding author: firstname.lastname@example.org
2Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
HIGH-RESOLUTION SPATIAL SOLUTION FOR AIR QUALITY ASSESSMENT IN THE TROPICAL CITY OF HO CHI MINH CITY, VIETNAM, Carpathian Journal of Earth and Environmental Sciences August 2022, Vol. 17, No. 2, p. 275 – 286; DOI:10.26471/cjees/2022/017/221
Air pollution is the leading environmental agent that poses a severe threat to human health and is one of the most severe problems in cities. Of the pollutants, particulate matter (PM), especially particles less than 2.5 microns in diameter, has the most profound health impacts. Urbanization and industrialization in cities have made the air quality up there worse and worse. Our study was based on the Aerosol Optical Depth (AOD) feature, a parameter obtained by remote sensing that relates to the presence of airborne particles potentially associated with PM. In this study, the PM2.5 concentration data from the ground monitoring station and the MODIS AOD product of 3 km resolution were correlated to build a suitable regression function to simulate the spatial distribution of PM2.5 concentrations. Next, the AOD was retrieved from the Landsat image based on the characteristics of the decrease in atmospheric clarity caused by the pollution particles. Landsat AOD has a 600m higher resolution than MODIS AOD. Research results on air quality (AQ) were simulated on Landsat AOD image through PM2.5 concentration distribution and air quality index (AQI), in which AQI was determined based on USEPA standards. The analysis shows that the linear regression function between PM2.5 concentration and MODIS AOD correlated best with the correlation coefficient R=0.9. Then PM2.5 distribution was established on Landsat AOD image with higher spatial resolution. Case analysis for March of 2018 reflected that the average concentration of PM2.5 across Ho Chi Minh City (HCMC) was higher than the allowable threshold specified in QCVN05:2013/BTNMT. PM2.5 concentration in central districts tended to be higher than in suburban districts. The study also found that the city average AQI-PM2.5 was around 97.38, peaking at 159, which was in the Unhealthy range, especially for sensitive groups. The result of the study provides potential solutions for AQ monitoring at the city level with a detailed spatial distribution.
Keyword: air pollution; AOD; AQI; high spatial resolution; PM2.5; regression analysis
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