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Updated: Jun 19, 2026

Façade-Level Monitoring of CO2 Variability under Urban Heat Island Conditions using Low-Cost Sensor Data Loggers
Published on: December 12, 2025
[A method for resolving spectra shift in the urban air quality monitoring system (DOAS)]
Shi-Sheng Liu1, Qing-Nong Wei, Wei-Wei Feng
1Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanic, Chinese Academy of Sciences, Hefei 230031, China. ssliu@aiofm.ac.cn
Abstract:
In the urban air quality monitoring system, there is spectra shift which is caused by environment factors on the optical part (temperature and optic fiber position), or by the self-change of Xe-lamp. Relative spectra shift will occur if the shift of lamp-spectrum and air-spectrum is inconsistent which has direct influences on the accuracy of the measurement results. So the match of wavelength between lamp-spectrum and air-spectrum should be considered when we retrieve pollutants concentration measurement of trace gas in the atmosphere through DOAS method. Based on the study of the unique structures for Xe-lamp emitting spectrum, a method for the calibration of two signal spectra using Xe-lamp emitting peak and least square fitting is given. The results show that, the impact of spectrum shift can be reduced by this method for retrieving results.
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