Contribution of Indoor and Outdoor Nitrogen Dioxide to Indoor Air Quality of Wayside Shops

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  • SHUAI Jianfei
    Department of Occupational Health, Catholic University of Daegu School of Public Health, Xinxiang Medical University
  • YANG Wonho
    Department of Occupational Health, Catholic University of Daegu
  • AHN Hogi
    Department of Occupational Health, Catholic University of Daegu
  • KIM Sunshin
    Department of Occupational Health, Catholic University of Daegu
  • LEE Seokyong
    Department of Occupational Health, Catholic University of Daegu
  • YOON Sung-UK
    Department of Occupational Health, Catholic University of Daegu

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Other Title
  • 道路沿いの商店の屋内空気質への屋外二酸化窒素の寄与

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Description

Indoor nitrogen dioxide (NO2) concentration is an important factor for personal exposure despite the wide distribution of its sources. Exposure to NO2 may produce adverse health effects. The aims of this study were to characterize the indoor air quality of wayside shops using multiple NO2 measurements, and to estimate the contribution of outdoor NO2 sources such as vehicle emission to indoor air quality. Daily indoor and outdoor NO2 concentrations were measured for 21 consecutive days in wayside shops (5 convenience stores, 5 coffee shops, and 5 restaurants). Contributions of outdoor NO2 sources to indoor air quality were calculated with penetration factors and source strength factors by indoor mass balance model in winter and summer, respectively. Most wayside shops had significant differences in indoor and outdoor NO2 concentrations both in winter and in summer. Indoor NO2 concentrations in restaurants were twice more than those in convenience stores and coffee shops in winter. While outdoor NO2 contributions in indoor convenience stores and coffee shops were dominant, indoor NO2 contributions were dominant in restaurants. These could be explained that indoor NO2 sources such as gas range and smoking mainly affect indoor concentrations comparing to outdoor sources such as vehicle emission. The indoor mass balance model by multiple measurements suggests that quantitative contribution of outdoor air on indoor air quality might be estimated without measurements of ventilation, indoor generation and decay rate.

Journal

  • Journal of UOEH

    Journal of UOEH 35 (2), 137-145, 2013

    University of Occupational and Environmental Health, Japan

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