The importance of indoor air quality has become an important issue along with the improvement of people's living standards and the increase in awareness of environmental issues.
Despite the need for more indoor air quality management based on health effects, research on indoor air pollution and...
The importance of indoor air quality has become an important issue along with the improvement of people's living standards and the increase in awareness of environmental issues.
Despite the need for more indoor air quality management based on health effects, research on indoor air pollution and the resulting health risk assessment is still insufficient for sensitive layer use facilities such as daycare center and elderly care facility.
The purpose of this paper is to measure the status and characteristics of indoor air quality by measuring bioaerosol and fine dust at daycare centers and nursing facilities, which are subject to investigation, and to evaluate the effeciency of indoor air quality improvement by air cleaners. Also by analyzing the efficiency, adaptive management measures were proposed.
Three daycare centers and two nursing facilities for the elderly were selected as subjecr facilities, located in the Seoul metropolitan area.
In order to measure and evaluate the efficiency of air cleaners installed in selected target facilities, target air pollutants were measured and evaluated by following instructions. The measurement period was divided into summer and winter to check the seasonal characteristics. Maintenance criteria pollutants among the Indoor Air Quality Control Act, fine dust and bacteria, and recommended criteria pollutant, fungi, were simultaneously measured in accordance with the official sampling method enacted by the Ministry of Environment of Korea. The installed air conditioner in the facility under study using product of L Electronics, could be used for both air cleaning and air conditioning by its modules.
Reduction efficiency of fine dust before and after the operation of air cleaners by target facilities showed following results. PM2.5 showed a reduction efficiency of 52.5 to 84.2 percent at daycare centers and nursing facilities. PM10 reduction efficiency was lower than that of PM2.5, but also high reduction efficiency of 43.9 to 72.5 % was observed. Seasonal fine dust reduction efficiency was different in PM2.5 and PM10 which was observed to be more efficient for PM10 in winter and PM2.5 in summer.
In nursing facilities, the concentration of airborne bacteria and fungi was observed to be relatively high in the summer.
Total airborne bacteria showed a reduction efficiency of approximately 30.2 to 66.1 %, while fungi had the efficiency of 43.9 to 72.5 %. In general, airborne bacteria have an elevation of 1 to 2 μm if they exist alone, and 3 to 7.5 μm if combined with each other, bigger size are derived from humans.
Fungus are similarly 2 to 5 μm when single-celled and can be determined as multicellular fungal spores if they have an elevation of 10 μm or more. Therefore, it was confirmed that the airborne bacteria and fungi had an reduction effect due to the operation of the air purifier along with fine dust.
Recently, due to the social distancing restriction caused by the COVID-19 pandemic, the time to stay indoors has been increasing. The longer you stay indoors, the greater the time and probability of exposure to indoor air pollution. In particular, air quality and hygiene management in enclosed spaces are very important, as can be seen in the mass group infection cases in nursing care facilities.
The result of this study can be used to provide basic data for the appropriate operation and maintenance of air cleaners nowadays.
The importance of indoor air quality has become an important issue along with the improvement of people's living standards and the increase in awareness of environmental issues.
Despite the need for more indoor air quality management based on health effects, research on indoor air pollution and the resulting health risk assessment is still insufficient for sensitive layer use facilities such as daycare center and elderly care facility.
The purpose of this paper is to measure the status and characteristics of indoor air quality by measuring bioaerosol and fine dust at daycare centers and nursing facilities, which are subject to investigation, and to evaluate the effeciency of indoor air quality improvement by air cleaners. Also by analyzing the efficiency, adaptive management measures were proposed.
Three daycare centers and two nursing facilities for the elderly were selected as subjecr facilities, located in the Seoul metropolitan area.
In order to measure and evaluate the efficiency of air cleaners installed in selected target facilities, target air pollutants were measured and evaluated by following instructions. The measurement period was divided into summer and winter to check the seasonal characteristics. Maintenance criteria pollutants among the Indoor Air Quality Control Act, fine dust and bacteria, and recommended criteria pollutant, fungi, were simultaneously measured in accordance with the official sampling method enacted by the Ministry of Environment of Korea. The installed air conditioner in the facility under study using product of L Electronics, could be used for both air cleaning and air conditioning by its modules.
Reduction efficiency of fine dust before and after the operation of air cleaners by target facilities showed following results. PM2.5 showed a reduction efficiency of 52.5 to 84.2 percent at daycare centers and nursing facilities. PM10 reduction efficiency was lower than that of PM2.5, but also high reduction efficiency of 43.9 to 72.5 % was observed. Seasonal fine dust reduction efficiency was different in PM2.5 and PM10 which was observed to be more efficient for PM10 in winter and PM2.5 in summer.
In nursing facilities, the concentration of airborne bacteria and fungi was observed to be relatively high in the summer.
Total airborne bacteria showed a reduction efficiency of approximately 30.2 to 66.1 %, while fungi had the efficiency of 43.9 to 72.5 %. In general, airborne bacteria have an elevation of 1 to 2 μm if they exist alone, and 3 to 7.5 μm if combined with each other, bigger size are derived from humans.
Fungus are similarly 2 to 5 μm when single-celled and can be determined as multicellular fungal spores if they have an elevation of 10 μm or more. Therefore, it was confirmed that the airborne bacteria and fungi had an reduction effect due to the operation of the air purifier along with fine dust.
Recently, due to the social distancing restriction caused by the COVID-19 pandemic, the time to stay indoors has been increasing. The longer you stay indoors, the greater the time and probability of exposure to indoor air pollution. In particular, air quality and hygiene management in enclosed spaces are very important, as can be seen in the mass group infection cases in nursing care facilities.
The result of this study can be used to provide basic data for the appropriate operation and maintenance of air cleaners nowadays.
Keyword
#Fine Dust Total Bacteria Colony Fungi Multi-use Facility Sensitive layer use facility Indoor Air Quality
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