• 생물환경조절학회지
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• 제31권2호
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• pp.79-89
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• 2022

본 연구에서는 한라봉 3농가, 절화장미 3농가를 대상으로 시설하우스 내부 농작업 종류와 특성에 따른 시설 내 작업자의 미세먼지 노출 현황과 특성을 파악하기 위하여 미세먼지 모니터링을 수행하였다. 한라봉 시설하우스 내부 경운작업의 경우 작업자가 지역시료에 비해 개인시료 측정 농도가 TSP 4.9배, PM-10 2.7배, PM-2.5 1.5배로 더 높게 나타났다. 절화장미 작업자는 개인시료의 경우 지역시료에 비해 TSP 농도 7.4배, PM-10 농도 3.2배 높은 것으로 나타나 시설 내부 작업 시 작업자는 전반적으로 더 높은 분진 환경에 노출되는 것으로 나타났다. 시설하우스 미세먼지 입경별 기여도 분석 결과, 10㎛ 이상의 큰 입자 분포를 가진 미세먼지가 경운작업 시 기계적 분쇄과정을 거쳐 한라봉 시설하우스에서 발생한 것으로 추정된다. 절화 장미 옆순 정리 작업 시 상대적으로 PM-10의 입경 분포를 가진 미세먼지 농도가 발생하는 것으로 판단되며, PM-2.5 크기를 가지는 입자에 의한 영향은 상대적으로 크지 않을 것으로 사료된다. 시설하우스 내부 작업동선에 따른 미세먼지 노출 특성 분석 결과, 경운작업 시 10㎛ 전·후의 미세먼지 농도가 증가한 것으로 나타났고, 시설하우스 작업시기와 이동시기와 비교하여 입경별 미세먼지 농도는 유의한 차이가 있으며, 작업 시 미세먼지 농도가 유의하게 높게 나타났다(p < 0.001). 한라봉 시설하우스 내부 이동시기 대비 경운작업시기의 경우 TSP 농도 3.8배, PM-10 농도 2.1배, PM-2.5 1.3배, PM-1.0 1.1배가 증가하였다. 절화장미 농가에서 이동 시 작업자에게 노출되는 미세먼지 농도의 경우 일반 대기환경 농도와 유사한 수준인 것으로 나타났지만, 이동시기 대비 작업시기에 TSP 농도가 3.4배, PM-10 3.2배, PM-2.5 1.6배, PM-1.0 1.1배 증가하였다. 작업동선별 미세먼지 농도 증가 추이 분석 결과, 미세먼지의 입경이 큰 범위에 속하는 TSP, PM-10의 경우 작업 시 TSP와 PM-10 평균 농도의 편차가 크게 나타났으며, 이는 농가별 작업의 종류, 시설 규모, 환기량, 농가의 운영관리상태 등에 따라 미세먼지 발생 영향에 기인한 것으로 판단된다. 본 연구의 시설하우스 내부 작업자의 미세먼지 노출현황과 특성 분석을 기반으로 시설하우스 내부 미세먼지 저감 프로그램 개발 및 작업 환경 개선 방안 마련을 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• 대기
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• 제25권1호
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• pp.169-177
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• 2015

Vertical distribution of particle mass concentrations was estimated from 8-year elastic-backscatter lidar and sky radiometer data, and from ground-level PM10 concentrations measured in Seoul. Lidar ratio and mass extinction efficiency were determined from aerosol optical depth (AOD) and ground-level PM10 concentrations, which were used as constraints to estimate particle mass concentration. The mean lidar ratio (with standard deviation) and mass extinction efficiency for the entire 8-year study period were $60.44{\pm}23.17$ sr and $3.69{\pm}3.00m^2g^{-1}$, respectively. The lidar ratio did not vary significantly with the ${\AA}ngstr{\ddot{o}}m$ exponent (less than ${\pm}10%$); however, the mass extinction efficiency decreases to $1.82{\pm}1.67m^2g^{-1}$ (51% less than the mean value) when the ${\AA}ngstr{\ddot{o}}m$ exponent is less than 0.5. This result implies that the particle mass concentration from lidar measurements can be underestimated for dust events. Seasonal variation of the particle mass concentration estimated from lidar measurements for the boundary layer, was quite different from ground-level PM10 measurements. This can be attributable to an inhomogeneous vertical distribution of aerosol in the boundary layer.

• 한국산업보건학회지
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• 제30권2호
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• pp.163-173
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• 2020

Objectives: The study was evaluated exposure variation and daily absorption level of cadmium, lead concentration of ambient air of monthly data from 1999 to 2017 for main exposure factor in outdoor workers. Methods: Based on the monthly data from 'The annual report of air quality in Korea from 1999 to 2018' in 'Air Korea' website in the Korean Ministry of Environment. The monthly data of PM_2.5, PM₁₀, cadmium, lead concentration of ambient air were recalculated to average, minimum, and maximum. And these data were combined to Asian-dust exposure data from 'The annual report of Asian-dust·smog in 2017' of National Institute of Meteorological Sciences in Korea. Results: Geometric mean(minimum-maximum) concentration in ambient air of monthly data were 0.0017 (ND-0.2015) mg/㎥ in cadmium and 0.0467(ND-0.8554) mg/㎥ in Pb from 1999 to 2017. Both of Cd and Pb concentration in ambient air showed the highest concentration in January and the lowest in August among annual variation from 1999 to 2017. PM₁₀ and PM_2.5 level showed the highest in March(PM₁₀) and February (PM_2.5) the lowest in August both of PM₁₀ and PM_2.5. Discussion: Based on exposure data and prior reports, daily Cd absorption was estimated to 0.013(ND-1.511) mg/day from respiration and 1.89 mg/day from daily food(25.2 mg/day of daily Cd intake). In case of Pb, daily absorption was estimated to 0.350(ND-6.416) mg/day from respiration and 1.38-1.71 mg/day from daily food intake. Conclusion: Cd and Pb with Asian-dust have high influential factor to increase the Cd and Pb exposure at Winter and Spring season in outdoor workers.

• 한국대기환경학회지
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• 제30권3호
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• pp.233-244
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• 2014

The objective of this study was to explore the characteristics of concentration of indoor air pollutants, such as $PM_{10}$, $CO_2$, and $NO_2$, measured by tele-monitoring system in a Seoul Metropolitan underground railway station from January 1, 2008 to December 31, 2012. The annual average concentration of indoor air pollutants actually varied over a wide range and was found to exhibit marked variation with time and measurement sites (tunnel inlet, platform, and concourse). After installing platform screen doors, the average $PM_{10}$ concentration on platform and concourse was decreased by 43.8% and 31.2%, respectively during the study periods. The relationship between the concentration of $PM_{10}$ and meteorological parameters (relative humidity and rainfall) or the Asian dust events was regarded as statistically significant. The correlations between the number of boarding/alighting passengers and $PM_{10}$, $CO_2$, and $NO_2$ were calculated. A p-value of less than 0.01 was regarded as significant except $NO_2$. The I/O ratio of $PM_{10}$ concentration was elevated after a congested time (about 08:00 am). The average I/O ratios of $NO_2$ were observed in concourse and platform on 03:00 am with $1.76{\pm}0.91$ and $1.50{\pm}0.51$, respectively. The average daily variation of standard excess rate of $PM_{10}$ and $NO_2$ concentration in concourse and platform was investigated. The highest standard excess rate was observed on 21:00 (09:00 pm).

• 한국산학기술학회논문지
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• 제16권6호
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• pp.4335-4347
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• 2015

본 연구에서는 2008년 8월부터 2012년 12월 까지 경기도 수원, 안산, 화성 등 초등학교 286곳을 대상으로 교실에서의 $PM_{10}$ 및 $CO_2$ 농도 현황을 조사하고, 환경적 특성을 파악하여 초등학교 학생들의 건강에 영향을 미치는 학교 실내공기질의 관리 방안으로 활용하고자 한다. 초등학교를 지역별로 구분하여 $PM_{10}$ 농도를 조사한 결과, 통계적으로 유의한 차이를 보이진 않았다. 그러나 지리적 특성에 따라 상대적으로 공단지역에서는 높은 농도를 보였으며, 농촌지역에서는 낮은 농도를 보였다. $CO_2$ 농도는 각 지역 간 농도 차이는 없는 것으로 나타났다. 연도별 $PM_{10}$ 농도를 분석한 결과, 수원은 2008년, 화성은 2009년에 가장 높은 농도로 나타났다(p<0.01). 안산지역은 2009년에 가장 높은 농도를 보였으나, 유의한 차이를 보이지 않았다. 각 지역 의 연도별 $CO_2$의 농도를 분석한 결과, 유의한 차이를 보이지 않는 것으로 분석 되었다(p-value = 0.366, 0.730, 0.210). 2008년 가을부터 2012년 겨울까지 $PM_{10}$와 $CO_2$의 계절별 시계열 분석 결과, $PM_{10}$의 경우는 2009년에 높게 나타났으며, 점차적으로 감소하는 경향을 보이다가 2012년에 다시 높아지는 경향을 보였다. $CO_2$는 연도별로 차이가 없는 것으로 나타났으나, 계절별로 는 봄과 겨울기간이 여름철보다 농도가 높아지는 경향을 나타내었다. $PM_{10}$과 $CO_2$, 건축년도, 학급 평균 인원, 온도, 습도와의 상관성을 분석한 결과, $CO_2$와 환경적 요인인 온도, 습도와 상관성은 각 -0.329, -0.188로 유의한 음의 상관성을 보였다(p< 0.01).

• 한국환경과학회지
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• 제24권6호
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• pp.785-792
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• 2015

This study investigates weekday/weekend characteristics of $PM_{10}$ concentration and chemical composition of water-soluble ions in Busan in the spring of 2013. Contribution rate of water-soluble ions to PM10 concentration in weekday/weekend were 41.5% and 38.5%, respectively. Contribution rate of SO_4{^{2-}}$ to total ion mass in weekday/weekend were 30.4% and 33.8%, respectively. Contribution rate of total inorganic water-soluble ions in PM10 in weekday/weekend were 42.2% and 39.1% (mean 41.4%), respectively. $[NO_3{^-}/SO_4{^{2-}}]$ ratio in weekday/weekend were 1.01 and 0.97(mean 0.99), respectively, which indicated that weekday ratio was higher. Contribution rate of sea salts and $Cl^-/Na^+$ ratio in PM10 in weekday/weekend were 8.1% and 7.6%, 0.37% and 0.41%, respectively. This research will help understand chemical composition of water-soluble ions during the weekday/weekend and will be able to measure the contribution level of artificial anthropogenic source on urban air.

• 한국환경과학회지
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• 제17권9호
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• pp.1005-1013
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• 2008

In this study, in order to analyze the air quality of the indoor environments of schools, we measured the indoor, outdoor and personal exposure concentration level of $PM_{10}$ for 40 classrooms(20 old, 20 new) in chungnam area from June 22 to July 19 and from November 21 to December 30, 2003. 1. Old classrooms contained more dust than new classrooms; the average of respirable dust is $43.27\;{\mu}g/m^3$ for new classrooms while $53.38\;{\mu}g/m^3$ for old one. The exposure concentration level of respirable dust in new classrooms were in summer higher outdoors than indoors. The values were indoors $46.71\;{\mu}g/m^3$, outdoors $50.46\;{\mu}g/m^3$, and personal $41.62\;{\mu}g/m^3$. Meanwhile in winter indoors had a higher concentration level than outdoors, the values being indoors $39.11\;{\mu}g/m^3$, outdoors $34.86\;{\mu}g/m^3$, and personal $49.01\;{\mu}g/m^3$. 2. Cr concentration level within dust was slightly higher in summer indoors ($101.50{\pm}32.10\;ng/m^3$) and outdoors ($100.89{\pm}35.18\;ng/m^3$) than winter indoors ($85.80{\pm}48.95\;ng/m^3$) and outdoors ($74.43{\pm}38.93\;ng/m^3$), but in personal concentration level, winter was higher. The results of this research show insufficient understanding of health risks from indoor air pollution, and shows possible health problems to students from school indoor air pollution. As such, a logical and systematic education program for students about the importance of indoor air quality should be carried out. Also the results of $PM_{10}$ concentration level measurements emphasize the need for regular measurements of indoor / outdoor and personal concentration level. New classrooms in particular needs to be used after measuring pollutants and safety, and requires installation of a ventilation device in all classrooms to improve air quality.

• The Journal of Korean Physical Therapy
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• 제14권2호
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• pp.172-180
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• 2002

The purpose of this paper was to make an analysis of anaerobic power in professional female basketball players using the Wingate Test Method with bicycle ergometer. Twenty-three subjects(age $21.6\pm2.8years$, body height $178.0\pm7.4cm$, body weight $70.3\pm7.4kg$) were selected from professional female basketball team whose careers were over 10years and participated in this investigation. Each subject peformed a Wingate anaerobic power test to determine total work, peak power, mean power, fatigue index and blood lactate concentration. The following were obtained from result data analysis; 1. The Total Work of athletes was a $1128.7\pm120.6watt$ 2. The Peak Power of athletes was a $449.5\pm53.1watt$ 3. The Mean Power of athletes was a $369.1\pm39.4watt$ 4. The Fatigue Index of athletes was a $33.5\pm6.9\%$ 5. The blood lactate concentration was $1.85\pm0.85mM/L$ at the normal state and $3.16\pm1.53mM/L$ at the after Wingate test. The blood lactate concentration was $6.96\pm0.81mM/L$ after 3 minute and $6.95\pm1.05mM/L$ after 5 minutes.

• 한국입자에어로졸학회지
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• 제17권4호
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• pp.107-114
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• 2021

In this study, the effect of the air purifier located in the living room on the reduction of PM_2.5 concentration in the living room and bedroom was investigated. Measurements were carried out in real-life for about 2 weeks in a Korean apartment building where a 3-person household had lived and the exclusive private area was 84.9 m². When the air purifier in the living room was operating, the change in PM_2.5 concentration was measured when the door to the bedroom connected to the living room was opened and closed. In the case of living with the bedroom door open, the average PM_2.5 concentrations in the living room and bedroom were almost the same. When living with the bedroom door closed, the average PM_2.5 in the living room was higher than in the bedroom. The ventilation and cooking effects in the living room mainly affected the PM_2.5 concentration in the living room. Only one air purifier in the living room was able to keep the PM_2.5 concentration in the living room and bedroom low.

• 한국환경과학회지
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• 제16권12호
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• pp.1355-1367
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• 2007

This study summarizes the relations among $PM_{2.5}$ concentration, water-soluble ions concentration, metallic element Components characteristics and SPSS in negative ion and metallic element of $PM_{2.5}$ particle in Miryang.(By the urban area, the industrial complex area and the suburban area according to the season) $PM_{2.5}$ concentration of total 72 samples collected from 3 sites turned out to range from 3.47 to 34.7 ${\mu}g/m^3$, and the average concentration was the suburban area-the kin nup(16.00 ${\mu}g/m^3$) > the urban area-the roof of the old Miryang university(10.32 ${\mu}g/m^3$) > the industrial complex-Sapo industrial complex(10.29 ${\mu}g/m^3$). In particular, the suburban area had $PM_{2.5}$ concentration 1.5 times those of urban area, industrial complex. It was thought although the site was suburban and farm-side without pollutants around, it had a higher concentration value influenced by external factors including the brickyard, small-scale incinerator, driving range construction, construction on the Daegu-Busan express and the widening of the four-lane road between Miryang-Anyang nearby. As for water-soluble ions among $PM_{2.5}$ particle collected in Miryang area, $SO4_{2^-}$ accounted for 60% and $NO_{3^-}$, was 30% in spring and summer. And $NO_{3^-}$ accounted for 50% and $SO4_{2^-}$ was 35% in fall and winter. The AI value of metallic Components among $PM_{2.5}$ particle collected in Miryang area had a high value influenced by the apartment complex construction and the extension work of road. The industrial complex area had Zn concentration 3 times, and Fe concentration 2 times those of urban area and suburb area. When it comes to the relation with metallic elements in urban area, the highest coefficient of correlation was between Cr-Fe with 0.85, and Pb-Cd turned out in the reverse correlation. Among metallic elements, the coefficients of correlation between Zn and Cr, Mn, Fe, NI were high in industrial complex area. The highest coefficient of correlation was between Mn-Zn with 0.88, meanwhile Ni and Cu, Cd turned out in the reverse correlation in the suburb area. These coefficients of correlation are attributed to the difference in pollutant sources, rather than difference in pollutant and non-pollutant.