Building databases and thematic maps of air quality in Quang Ninh province using GIS technology
Abstract
Quang Ninh province hosts numerous industries such as coal, cement, and thermal power, raising concerns about high levels of air pollution with harmful emissions including SO2, NO2, O3, CO, and fine particulate matter such as PM2.5 and PM10. This study applied GIS technology to construct databases and thematic maps of air quality for Quảng Ninh province. Results from 62 monitoring points indicate that concentrations of SO2, NO2, O3, and CO mostly remain within the guideline values set by QCVN 05:2023/BTNMT. However, for Total Suspended Particulates (TSP), seven monitoring points in Dong Trieu, Ha Long, and Cam Pha exceed the allowable limits. The developed database comprises a spatial database and an attribute database, including 21 data fields representing measurement values of five indicators SO2, NO2, O3, CO, and TSP at 62 monitoring points in 2022. Interpolation maps constructed using the IDW method depict the pollutant concentrations across Quang Ninh province at various levels. The database and thematic maps facilitate clear, visual, and easy comparison of air quality data at each monitoring point with the QCVN 05:2023/BTNMT allowable limits. Therefore, the database and thematic maps can be utilized for querying, statistical analysis, and evaluation, serving air quality management in Quang Ninh province.
