Infiltration of Ambient PM2.5 through Building Envelope in Apartment Housing Units in Korea

Choi, Dong Hee; Kang, Dong Hwa

doi:10.4209/aaqr.2016.06.0287

Cited by 27 publications

(22 citation statements)

References 36 publications

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“…However, filtration does not reduce the levels of all indoor air pollutants, and some types can actually exacerbate the problem (Yu et al, 2006). Chemicals or particles can penetrate indoors through the building envelope, affecting the indoor PM 2.5 levels in real housing units with a controlled indoor-outdoor pressure differences (Choi and Kang, 2017). Therefore, a well-defined performance metrics of air cleaner is need to developed for the indoor air quality management (Hodgson et al, 2007;Yan et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Investigation of A Potted Plant (Hedera helix) with Photo-Regulation to Remove Volatile Formaldehyde for Improving Indoor Air Quality

Chen

Lin

Chuah

2017

Aerosol Air Qual. Res.

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Formaldehyde is the most common volatile organic compound (VOC) emitted from household materials and is associated with many health risks, including sick building syndrome. A potted Hedera helix was used as an air purifier to remove the gaseous formaldehyde. Development of a test platform is necessary to evaluate the indoor performance of air cleaning protocols. The box modulation with a novel volatile pollutant-emitting source was applied in an air quality monitoring experiment to mimic a non-ventilated workplace. The environmental conditions and the pollutant concentrations in the air were measured in real time, and the monitoring data was uploaded to cloud storage media by a wireless technique. Compared with natural dissipation, our results demonstrate a 70% decrease in the required time to achieve 1.0 ppm of gaseous formaldehyde using the biological purifier. In addition, the effect of photo-regulation was not significant in the use of potted plants to remove gaseous formaldehyde. Our study provides an accurate and available platform for the public to determine the health risks of VOCs in their buildings.

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Section: Introductionmentioning

confidence: 99%

Investigation of A Potted Plant (Hedera helix) with Photo-Regulation to Remove Volatile Formaldehyde for Improving Indoor Air Quality

Chen

Lin

Chuah

2017

Aerosol Air Qual. Res.

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“…Ventilation could influence personal exposure in enclosed MEs under two situations: 1) limited natural ventilation inherent in the structure of certain MEs (e.g., MEs lying deep in underground with low ventilation rates) (Choi et al , 2017); and 2) modern air handling systems with good filtration reduce particle levels in enclosed MEs.…”

Section: Discussionmentioning

confidence: 99%

Comparison of PM2.5 Exposure in Hazy and Non-Hazy Days in Nanjing, China

Zhang

Chillrud

et al. 2017

Aerosol Air Qual. Res.

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Fine particulate matter (PM 2.5 ), levels of which are about 6 times the 2014 WHO air quality guidelines for 190 cities in China, has been found to be associated with various adverse health outcomes. In this study, personal PM 2.5 exposures were monitored along a fixed routine that included 19 types of non-residential micro-environments (MEs) on 4 hazy days (ambient PM 2.5 292 ± 70 µg m -3 ) and 2 non-hazy days (55 ± 16 µg m -3 ) in Nanjing, China using miniaturized real-time portable particulate sensors that also collect integrated filters of PM 2.5 (MicroPEMs, Research Triangle Institute (RTI), NC). Gravimetric correction is necessary for nephelometer devices in calculating real-time PM levels. During both hazy and non-hazy days, personal PM 2.5 levels were generally higher in MEs with noticeable PM 2.5 sources than MEs serving as receptor sites, higher in open MEs than indoor MEs, and higher in densely populated MEs than MEs with few people. Personal PM 2.5 levels measured during hazy and non-hazy days were 242 ± 91 µg m -3 and 103 ± 147 µg m -3 , respectively. The ratio of personal exposure to ambient PM 2.5 levels (r p/a ) was less than 1.0 and less variable on hazy days (0.85 ± 0.31); while it was larger than 1.0 and more variable on non-hazy days (1.71 ± 1.93), confirming the importance of local sources other than ambient during non-hazy days. Air handling methods (e.g., ventilation/filtration) impacted personal exposures in enclosed locations on both types of days. Street food vendors with cooking emissions were MEs with the highest personal PM 2.5 levels while subway cars in Nanjing were relatively clean due to good air filtration on both hazy and nonhazy days. In summary, on hazy days, personal exposure was mainly affected by the regional ambient levels, while on non-hazy days, local sources together with ambient levels determined personal exposure levels.

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“…Recent apartments have similar plan with three-or four-bay (bay means the number of rooms facing outdoors in line with the living room, including the living room) and a mechanical ventilation system is mandatory. New apartments have high-sealed windows to save cooling and heating energy, which could affect the penetration coefficient [29]. To obtain coefficients P and k as well as filter efficiency of system in a new apartment house in Korea, experiments were carried out for 20 days from 4 July 2017 to 23 July 2017.…”

Section: P K ηV and ηF Estimationmentioning

confidence: 99%

Effect of Flow Rate and Filter Efficiency on Indoor PM2.5 in Ventilation and Filtration Control

Kim¹,

Yeo

2020

Atmosphere

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Ventilation and filtration control play a critical role in determining indoor PM2.5 (particles less than 2.5 μm in aerodynamic diameter) concentrations of outdoor or indoor origin in residential environments. The objective of this study was to investigate the combined effects of flow rates and filter efficiency on indoor PM2.5 concentrations of residential buildings in Seoul, Korea. Using a particle model based on a mass–balance equation, parametric analysis was performed to examine indoor PM2.5 concentrations according to flow rates and filter efficiency under a wide range of outdoor concentrations and indoor generations. Results showed that ventilation control equipped with a medium–efficiency filter was as effective as that with a high-efficiency filter under normal outdoor concentration and high indoor generation rate conditions. It is not recommended to apply a low-efficiency filter because indoor concentration increases rapidly as outdoor PM2.5 increases when ventilation flow rate is high. For filtration control, it is important to increase both flow rate and filter efficiency in order to improve indoor PM2.5 concentration.

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Infiltration of Ambient PM2.5 through Building Envelope in Apartment Housing Units in Korea

Cited by 27 publications

References 36 publications

Investigation of A Potted Plant (Hedera helix) with Photo-Regulation to Remove Volatile Formaldehyde for Improving Indoor Air Quality

Investigation of A Potted Plant (Hedera helix) with Photo-Regulation to Remove Volatile Formaldehyde for Improving Indoor Air Quality

Comparison of PM2.5 Exposure in Hazy and Non-Hazy Days in Nanjing, China

Effect of Flow Rate and Filter Efficiency on Indoor PM2.5 in Ventilation and Filtration Control

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