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Study on Influencing Mechanism of Outdoor Plant-related Particles on Indoor Environment and its Control Measures during Transitional Period in Nanjing

Category: Air Pollution and Health Effects

Volume: 19 | Issue: 3 | Pages: 571-586
DOI: 10.4209/aaqr.2018.01.0027
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Bin Zhou 1, Lu Feng1, Angus Shiue2, Shin-Cheng Hu2, Yu Wang1, Fei Li1, Ti Lin2, Hui-Fang Liu1, Peng Wei1, Yang Xu1

  • 1 Department of HVAC, College of Urban Construction, Nanjing Tech University, Nanjing 210009, China
  • 2 Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan


Plant pollutant has influence on indoor PM concentration in transition season in Nanjing.
Air filtration technique in CCFU is needed to improve indoor air quality.
The lower the relative humidity was, the larger the particle mass concentration was.
The larger the particle size was, the lower the I/O ratio was.
Human activities have greater impact on large particles than small particles.


Most city trees in Nanjing are Platanus acerifolia and Populus nigra, which generate many whirling willow catkins in the air during the transitional season, yet little attention has been paid to the health risks, including itchy skin and respiratory infections, on occupants of roadside buildings. Since the air quality of these indoor spaces cannot meet WHO guidelines during the transitional season due to the influence of plant pollutants, a suitable ventilation scheme, together with air filtration measures, is urgently needed. Hence, four ventilation schemes were compared: natural ventilation, no ventilation with the door and windows closed, recirculating ventilation with a ceiling cassette fan-coil unit but no air filter, and recirculating ventilation with a ceiling cassette fan-coil unit and F7 filter. The performance of these modes was evaluated by comparing the effects of outdoor particulate matter on the indoor air quality. The results showed that the larger the particle size, the lower the I/O ratio. Furthermore, the influence of the occupants’ activities on indoor particle concentrations cannot be ignored, particularly for large particles, which varied more than small particles according to indoor human activity. Therefore, we suggest operating the ceiling cassette fan-coil unit with an air filter for this application, which can reduce the indoor particle concentration to an acceptable level and decrease the potential health risk posed by plant pollutants.


Plant pollutants Transition season Infiltration air Ventilation modes Indoor air quality

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