Observation of HONO and NO2 in suburban area of Hefei based on multi-wavelength LED coupled long-path DOAS technology

doi:10.3969/j.issn.1673-6141.2025.06.003

Abstract

Abstract: A long-path differential optical absorption spectroscopy (LP-DOAS) system based on a multiwavelength LED coupled light source was used to continuously monitor the mass concentrations of NO2 and HONO in the suburbs of Hefei, China, from March to May 2022. We found that the monthly averaged NO2 showed the order of March (19.00 μg/m3) > April (16.03 μg/m3) > May (14.66 μg/m3), and the monthly averaged HONO showed the order of May (1.42 μg/m3) > April (1.31 μg/m3) > March (1.25 μg/m3). At the same time, the correlation coefficient R between NO2 mass concentrations monitored by multi-wavelength LED LP-DOAS and those monitored by CNEMC reached 0.895. Considering that NO2 mainly comes from traffic emissions, its mass concentration was found to be the lowest at 14:00. The high mass concentration of HONO during the daytime occurred at 08:00, 12:00–13:00 and 16:00–18:00 during the daytime, corresponding to the three periods of higher NO2 mass concentration periods, respectively, indicating that the heterogeneous reaction of NO2 on the wet surface may be the important source of HONO. In addition, the study also found that the mass concentrations of NO2 and HONO during 11: 00 – 15: 00 on weekends were higher than those during the same time periods on weekdays. Further analysis showed that PM2.5 mass concentration and relative humidity can affect the rate of heterogeneous reaction of NO2 to generate HONO, and the higher the PM2.5 mass concentration and relative humidity during the observation period, the greater the fitting slope between NO2 and HONO, indicating a higher generation rate of HONO.

Key words: multi-wavelength LED, long-path differential optical absorption spectroscopy, NO2, HONO; heterogeneous reaction

CLC Number:

X831
X511

GAO Qi , XING Chengzhi , LIN Hua , MA Wanchao , LIU Wenqing . Observation of HONO and NO2 in suburban area of Hefei based on multi-wavelength LED coupled long-path DOAS technology[J]. Journal of Atmospheric and Environmental Optics, 2025, 20(6): 713-725.

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