Open Access

ARTICLE

Retrieval and Regional Distribution Analysis of Ammonia, Sulfur Dioxide and Nitrogen Dioxide in the Urban Environment Using Ultraviolet DOAS Algorithm

by Hao Chen¹, Jie Xu¹, Yibo Hu¹, Fuzhou Niu^1,*, Zhiyan Li², Dan Wang², Guizhong Fu¹, Chuanxin Li^3,*

1 School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
2 Department of Optoelectronic Engineering, School of Mathematics and Physics, Anhui University of Technology, Ma'an Shan, 243032, China
3 Hefei Qifeng Photoelectric Technology Co., Ltd., Hefei, 230000, China

* Corresponding Authors: Fuzhou Niu. Email: ; Chuanxin Li. Email:

(This article belongs to the Special Issue: Advanced Intelligent Decision and Intelligent Control with Applications in Smart City)

Computer Modeling in Engineering & Sciences 2023, 134(2), 1251-1262. https://doi.org/10.32604/cmes.2022.022279

Received 02 March 2022; Accepted 25 March 2022; Issue published 31 August 2022

Abstract

Aiming at the in situ and mobile observation of urban environmental air pollution, a portable instrument using ultraviolet spectrum retrieval algorithm was developed based on the basis of Differential Optical Absorption Spectroscopy (DOAS) and multiple-pass cell technique. Typical trace gas pollutants, NH₃, SO₂, and NO₂, were explored using their optical spectral characteristics in deep ultraviolet wavelength range from 210 to 215 nm. The gas concentration was retrieved by Lambert-Beer's law and nonlinear least square method. With an optimized optical alignment, the detection limits of NH₃, SO₂, NO₂ were estimated to be 2.2, 2.3, and 36.2 ppb, respectively. The system was used in carrying out some cruise observations in Chengdu, China. During the entire period, the polluted gases showed varied distribution and typical daily average concentrations of NH₃, SO₂, NO₂ were 23.2, 3.5, and 106.0 ppb, respectively. The contributions from different sources were analyzed combined with the HYSPLIT model. Results show that the portable DOAS system is a convenient and effective tool for regional distribution measurement and pollution source monitoring.

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Keywords

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