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Comparisons of measured nitrous acid (HONO) concentrations in a pollution period at urban and suburban Beijing, in autumn of 2014

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Abstract

To study the HONO formation mechanisms during a pollution period, a continuous measurement was performed in both urban and suburban aeras of Beijing. During this period, the PM2.5 concentrations increased to 201 and 137 μg/m3 in urban and suburban areas, respectively. The concentrations of HONO, CO, SO2, O3, NO, NO2, NO x were 1.45 ppbv, 0.61 ppmv, 8.7 ppbv, 4.3 ppbv, 44.4 ppbv, 37.4 ppbv, 79.4 ppbv and 0.72 ppbv, 1.00 ppmv, 1.2 ppbv, 7.9 ppbv, 3.7 ppbv, 8.2 ppbv, 11.9 ppbv, in urban and suburban areas, respectively. To compare possible pathways of HONO formation in both sites, the contributions of direct emissions, heterogeneous formations, and homogeneous productions were studied. HONO/NO2 ratios in the two sites indicated that heterogeneous reactions of NO2 were more efficient in suburban areas. And in both urban and suburban areas, the increase of PM2.5 concentrations and RH would promote the conversion efficiency in RH that ranged from 0% to 85%. However, when RH was above 85%, the HONO formation slowed down. Moreover, the study of direct emissions and homogeneous reactions showed that they contributed to a majority of HONO increase in urban areas than the 20% contributions in suburban areas. It implied that the high NO x concentrations and NO concentrations in urban areas or in pollution periods would make direct emissions and homogeneous reactions become dominant in HONO formations.

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Authors and Affiliations

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species; Beijing National Laboratory for Molecular Sciences; Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Shengrui Tong, Siqi Hou, Ying Zhang & Maofa Ge

  2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

    Biwu Chu, Yongchun Liu & Hong He

  3. Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China

    Pusheng Zhao

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  1. Shengrui Tong
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  2. Siqi Hou
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  3. Ying Zhang
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  4. Biwu Chu
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  5. Yongchun Liu
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  6. Hong He
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  7. Pusheng Zhao
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  8. Maofa Ge
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Correspondence to Shengrui Tong or Maofa Ge.

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Tong, S., Hou, S., Zhang, Y. et al. Comparisons of measured nitrous acid (HONO) concentrations in a pollution period at urban and suburban Beijing, in autumn of 2014. Sci. China Chem. 58, 1393–1402 (2015). https://doi.org/10.1007/s11426-015-5454-2

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  • DOI: https://doi.org/10.1007/s11426-015-5454-2

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