Vol. 32 No. 4 (2022): Coming Issue

Development of Multi-axis Differential Optical Absorption Spectroscopy System and its Application in Measuring Atmospheric NO\(_2\) Volume Mixing Ratio in Hanoi

Institute of Physics, VAST, Hanoi
Bui Van Hai
Le Quy Don Technical University
Nguyen Thi Thanh Bao
(1)Institute of Physics, Vietnam Academy of Science and Technology; (2) Graduate University of Science and Technology GUST
Pham Dong Bang
\(^1\)Graduate University of Science and Technology, Vietnam Academy of Science and Technology; </BR> \(^2\)Department of Physics, Faculty of Basic-Fundamental Sciences, Vietnam Maritime University, 484 Lach Tray Road, Le Chan, Hai Phong, Vietnam
Vu Thi Kim Oanh
Institute of Physics, Vietnam Academy of Science and Technology
Nguyen Xuan Tu
(1) Institute of Physics, Vietnam Academy of Science and Technology; (2) Graduate University of Science and Technology GUST
Phung Viet Tiep
Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
Pham Hong Minh
Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
Nguyen Gia Cuong
Center for Environmental Monitoring, 556 Nguyen Van Cu, Hanoi

Published 09-08-2022


  • volume mixing ratio

How to Cite

Trung, D. V., Bui Van, H., Nguyen, T. T. B., Pham, D. B., Vu, T. K. O., Nguyen, X. T., Phung, V. T., Pham, H. M., & Nguyen, G. C. (2022). Development of Multi-axis Differential Optical Absorption Spectroscopy System and its Application in Measuring Atmospheric NO\(_2\) Volume Mixing Ratio in Hanoi. Communications in Physics, 32(4). https://doi.org/10.15625/0868-3166/17173


Monitoring the concentration and distribution of nitrogen dioxide NO2 in urban environment is of great interest because of the importance of this gaseous pollutant in affecting air quality. In this paper we present the development of a multi-axis differential optical absorption spectroscopy instrument capable of sensitively detecting NO2. The passive instrument collects the sun light scattered by the air molecules and aerosols in the atmosphere and measures the spectrum using a highly sensitive portable spectrometer. The viewing direction of the instrument is controlled through a motor and can be changed continuously. Data analysis of the measured spectra allows us to simultaneously determine the differential scant column density of NO2 and oxygen dimer O4. From the accurately known concentration of O4, the effective optical path length of scattered sun light near the horizontal direction could be derived, which in turn provides an estimate the concentration of NO2. The measured data show that the concentration of NO2 in Hanoi is in the range ~1.5 ppb. We also present the detection of formaldehyde HCHO and possible detection of glyoxal CHOCHO. Our sensitive instrument opens up the possibility to monitor the concentration of other molecular species of interest in urban environment of Hanoi.


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