Open AccessTemporal variation of tropospheric NO2 columns in Vietnam during 2015–2020
Author(s) -
Nguyen Ha Trang,
Nguyen Thi Tuyet Nam
Publication year - 2021
Publication title -
technical education science/giáo dục kỹ thuật
Language(s) - English
Resource type - Journals
eISSN - 2615-9740
pISSN - 1859-1272
DOI - 10.54644/jte.67.2021.1093
Subject(s) - troposphere , atmospheric sciences , nitrogen dioxide , atmosphere (unit) , environmental science , ozone , tropospheric ozone , ozone monitoring instrument , air pollution , pollution , satellite , ground level , climatology , meteorology , geography , geology , chemistry , physics , architectural engineering , ground floor , astronomy , ecology , organic chemistry , engineering , biology
Nitrogen dioxide (NO2) in the atmosphere can be measured using the tropospheric NO2 columns, indicating the number of molecules of NO2 in an atmospheric column from the ground surface to the top of the atmosphere above a square centimeter of the surface. In this study, the temporal variations of tropospheric NO2 columns in Vietnam during 2015–2020 were investigated. To do this, data on the columnar NO2 obtained from the Ozone monitoring instrument (OMI) onboard the NASA’s Earth orbiting satellite Aura were used. Consequently, northeastern Vietnam showed the highest values of the tropospheric NO2 columns over the whole study period (2015–2020), suggesting that this area would be a hot spot of NO2 pollution in Vietnam. In addition, the lowest and highest mean levels of columnar NO2 were found in 2020 and 2016, respectively. However, there is no statistical significance among the columnar NO2 in 2015–2020. Regarding the monthly variation, March and April exhibited the highest levels of tropospheric NO2 columns, which would be affected by frequent combustion activities (e.g., post-harvesting combustion) and meteorological conditions, such as lower air temperature. Results of this study can contribute to an understanding of NO2 pollution in Vietnam over long period.