Outdoor to Indoor Air Quality in Urban Environment
The World Health Organisation(WHO)stated that air pollution is the worlds largest single environmental health risk,and this risk is particularly high in urban areas(WHO,2014).Heavy traffic,high population density and packed city morphology with deep street canyons have resulted in a very high level of harmful outdoor pollutants in major cities like Hong Kong.Nevertheless,buildings still need to take in “fresh air from the outside for their occupants.As the outdoor air remains unhealthy,the impact of bringing it into the indoor air environment needs to be further clarified.This study focuses on the relationship between indoor and outdoor air quality,and examines how outdoor air quality varies with height in the urban street canyon.Field measurements were conducted in a high-rise office building located in a densely populated district in Hong Kong.Using the data collected,analyses were performed to check if the indoor air quality could meet the WHO daily average PM2.5 standard of 25 μg/m3 and CO2 concentration of less than 1000 ppm.Our result shows there can be an effective reduction of PM2.5 from outdoor to indoor,and a satisfactory CO2 level in the building.Outside the building,our measurements show complex vertical variations of PM2.5 with the height that are different from what is expected from simple boundary layer theory.This may be related to the complex urban morphology and the vigorous vertical mixing within the urban street canyon.Nevertheless,even with such complexity,our results also show that it is still possible to have a building operate properly to provide a healthy indoor environment for the occupants,despite the relatively polluted outdoor environment.
indoor environmental quality dense urban environment street canyon particulate matter CO2 concentration
Alexis LAU Kai-hon Jimmy TONG Chun-kuen CHE Wenwei FUNG Ka-kit Joonho YEO LI Tan-yui PANG Wing-sum
Division of Environment,The Hong Kong University of Science and Technology,Hong Kong SAR Arup,Hong Kong SAR Cheuk Fung engineering co ltd,Hong Kong SAR City university of Hong Kong,Hong Kong SAR SMEC Asia Ltd,Hong Kong SAR
国际会议
2017世界可持续建筑环境大会(the World Sustainable Built Environment Conference)
香港
英文
1300-1306
2017-06-05（万方平台首次上网日期，不代表论文的发表时间）