Annals of Occupational and Environmental Medicine

Original Article

Association between ambient particulate matter levels and hypertension: results from the Korean Genome and Epidemiology Study: Sewhan Na, Jong-Tae Park, Seungbeom Kim, Jinwoo Han, Saemi Jung, Kyeongmin Kwak; Ann Occup Environ Med 2023;35:e51. Published online December 4, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e51

Abstract Abstract in Korean PDF Supplementary Material PubReader ePub: Background
Recently, there has been increasing worldwide concern about outdoor air pollution, especially particulate matter (PM), which has been extensively researched for its harmful effects on the respiratory system. However, sufficient research on its effects on cardiovascular diseases, such as hypertension, remains lacking. In this study, we examine the associations between PM levels and hypertension and hypothesize that higher PM concentrations are associated with elevated blood pressure.
Methods
A total of 133,935 adults aged ≥ 40 years who participated in the Korean Genome and Epidemiology Study were analyzed. Multiple linear regression analyses were conducted to investigate the short- (1–14 days), medium- (1 and 3 months), and long-term (1 and 2 years) impacts of PM on blood pressure. Logistic regression analyses were conducted to evaluate the medium- and long-term effects of PM on blood pressure elevation after adjusting for sex, age, body mass index, health-related lifestyle behaviors, and geographic areas.
Results
Using multiple linear regression analyses, both crude and adjusted models generated positive estimates, indicating an association with increased blood pressure, with all results being statistically significant, with the exception of PM levels over the long-term period (1 and 2 years) in non-hypertensive participants. In the logistic regression analyses on non-hypertensive participants, moderate PM₁₀ (particulate matter with diameters < 10 μm) and PM_2.5 (particulate matter with diameters < 2.5 μm) levels over the long-term period and all high PM₁₀ and PM_2.5 levels were statistically significant after adjusting for various covariates. Notably, high PM_2.5 levels of the 1 year exhibited the highest odds ratio of 1.23 (95% confidence interval: 1.19–1.28) after adjustment.
Conclusions
These findings suggest that both short- and long-term exposure to PM is associated with blood pressure elevation.; 대기 중 미세먼지 농도와 고혈압과의 연관성: 한국인유전체역학조사사업 자료를 기반으로
목적
환경보건에서 대기 중 미세먼지 농도의 중요성이 갈수록 커지고 있으나 아직 미세먼지 농도와 고혈압과의 연관성에 대한 연구 결과가 충분하지 못하여 확실한 결론을 내리기 어려운 상황에 처해있다. 본 연구는 대기 중 미세먼지 노출과 혈압 상승의 상관관계를 밝히는 데에 목적을 두고 있다.
방법
본 연구는 질병관리청 국립보건연구원에서 담당하고 있는 한국인유전체역학조사사업 코호트와 대기오염 모니터링 자료가 연계된 데이터에서 추출한 133,935 명을 대상으로 하였다. 다중선형 회귀분석과 로지스틱 회귀분석을 수행하여 대기 중 미세먼지 농도와 혈압 수준과의 상관관계를 평가하였다.
결과
다중선형 회귀분석에서는 성별, 나이 등과 같은 공변수들을 보정하기 전과 후 모두 통계적으로 유의하게 미세먼지 농도가 증가할수록, 혈압이 상승하였다. 로지스틱 회귀분석에서 고혈압의 오즈비(odds ratio; OR)는 높은 대기 중 미세먼지 농도에 노출된 참여자들에서 통계적으로 유의하게 증가한 반면, 중등도의 미세먼지 농도에 노출된 참여자들에서는 노출기간에 따라 결과가 달라지는 양상을 보였다.
결론
본 연구의 결과는 대기 중 미세먼지 노출이 고혈압 위험도 증가와 관련될 수 있음을 시사한다.

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Original Article

Association between exposure to particulate matter and school absences in Korean asthmatic adolescents: Seongmin Jo, Kiook Baek, Joon Sakong, Chulyong Park; Ann Occup Environ Med 2022;34:e21. Published online August 22, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e21

Abstract Abstract in Korean PDF Supplementary Material PubReader ePub: Background
Because particulate matter (PM) and asthma are closely related, the prevalence of school absence among adolescents with asthma can be affected by the concentration of PM. We aimed to investigate the relationship between school absences due to asthma and the total number of days that the PM concentration exceeded the standard.
Methods
We used the data from the 16th Korea Youth Risk Behavior Survey and the PM levels of 17 metropolitan cities and provinces gathered from the AirKorea. Information on the characteristics of asthmatic adolescents and the prevalence of school absence was obtained using a questionnaire, while the PM levels based on the total number of days with poor and very poor PM grades were collected from the AirKorea website. Both χ² test and logistic regression analysis were performed using the weights presented in the original dataset.
Results
In the case of particulate matter of 10 microns in diameter or smaller (PM₁₀), the odds ratio (OR) after adjusting for confounders (sex, school year, body mass index, smoking history, diagnosis of allergic rhinitis, diagnosis of atopic dermatitis and city size) was 1.07 (95% confidence interval [CI]: 1.01–1.13) for absents due to asthma when the total days of poor and very poor grades of PM₁₀ (81 μg/m³ or higher) increased by 1 day. In the analysis of particulate matter of 2.5 microns in diameter or smaller (PM_2.5), the OR after adjusting for confounders was 1.01 (95% CI: 1.00–1.03) for absents due to asthma when the total number of days with poor and very poor PM_2.5 grades (36 μg/m³ or higher) increased by 1 day.
Conclusions
A significant association was observed between the total number of days of poor and very poor PM₁₀ and PM_2.5 grades and school absence due to asthma; PM can cause asthma exacerbation and affect the academic life.; 한국 천식 청소년의 미세먼지 노출과 학교 결석과의 상관관계
목적
미세먼지와 천식은 밀접한 관련이 있기 때문에 천식을 앓고 있는 청소년들의 천식악화로 인한 결석률은 미세먼지 농도에 영향을 받을 수 있다. 이번 연구는 일정 기준의 미세먼지 농도를 초과하는 총 일수와 천식 악화로 인한 학교 결석의 관계를 조사했다.
방법
제16차 청소년건강행태조사의 설문결과 중 천식을 진단받은 청소년들을 대상으로 ‘천식으로 인한 학교 결석 여부’를 결과변수로, 에어코리아에서 제공하는 광역시·도의 미세먼지 측정 자료 중 연간 나쁨 및 매우나쁨 등급을 받은 날짜를 미세먼지의 노출 지표로 사용하여 분석하였다. 분석 시 복합표본설계에 따른 가중치를 적용한 카이-제곱 검정과 로지스틱 회귀 분석을 사용하였다.
결과
교란 변수를 보정 후, 1년간 대기 중 PM10 나쁨 및 매우나쁨 등급을 합산한 총 일수가 1일 증가할 때 천식 증상 악화로 인한 학교 결석에 대한 오즈비는 1.06 (95% 신뢰 구간: 1.01–1.13)이었다. PM2.5는 1년간 대기 중 나쁨 및 매우나쁨 등급을 합산한 총 일수가 1일 증가할 때, 천식 증상 악화로 인한 학교 결석에 대한 오즈비는 1.01 (95% 신뢰구간: 1.00–1.02)이었다.
결론
PM10과 PM10의 나쁨 및 매우나쁨 등급을 합산한 총 일수와 천식으로 인한 학교 결석 사이에 유의한 연관성이 관찰되었다.

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Research Article

A cross-sectional study on the pulmonary function of residents in two urban areas with different PM₁₀ concentrations: data from the fourth Korea national health and nutrition examination survey (KNHANES) 2007–2009: Si Woo Park, Byoung Gwon Kim, Jung Woo Kim, Jung Woo Park, Jung Il Kim; Ann Occup Environ Med 2018;30:47. Published online July 16, 2018; DOI: https://doi.org/10.1186/s40557-018-0258-4

Abstract PDF PubReader ePub

Background

The present study aims to compare the pulmonary function of residents of Seoul special city (Seoul) and Jeju special self-governing province including Jeju city and Seogwipo city (Jeju), characterized by vastly different annual average airborne particulate matter with an aerodynamic diameter less ≤10 μm (PM₁₀) concentrations, with the annual average PM₁₀ concentration in Seoul being significantly higher than that in Jeju.

Methods

This cross-sectional study analyzed the pulmonary function test results and sociodemographic data of Korean adults ≥19 years of age derived from the 4th KNHANES, 2007–2009. A total of 830 individuals residing in Seoul or Jeju were included in this study. T-tests were used to analyze predicted values of forced expiratory volume in 1 sec (FEV1p), predicted values of forced vital capacity (FVCp) and FEV1/FVC ratio (FEV1/FVC), as dependent variables, to examine the differences in the subjects’ pulmonary function according to the city of residence. Stratified analysis was then performed to adjust for variables potentially affecting pulmonary function. The analysis was performed on subjects as a group and also following stratification according to sex and other variables.

Results

Seoul residents had a significantly lower FVCp than that of the Jeju residents (difference: 3.48%, p = 0.002). FEV1p, FVCp and FEV1/FVC of male Seoul residents were significantly lower than those of male Jeju residents (difference: 6.99, 5.11% and 0.03, respectively; p < 0.001, p = 0.001, p = 0.001). In male subjects, statistically significant results were obtained even after adjusting the influence of other variables through stratified analysis.

Conclusion

The present analysis was based on cross-sectional data collected at one point in time. Therefore, unlike longitudinal studies, it does not establish a clear causal association between the variables. Nevertheless, this study found that pulmonary function among subjects residing in Seoul was significantly decreased compared to that of subjects residing in Jeju.

Citations

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Research Article

Spatial analysis between particulate matter and emergency room visits for conjunctivitis and keratitis: Jung-Youb Lee, Jung-Won Kim, Eun-Jung Kim, Mi-Young Lee, Chang-Wook Nam, In-Sung Chung; Ann Occup Environ Med 2018;30:41. Published online June 11, 2018; DOI: https://doi.org/10.1186/s40557-018-0252-x

Abstract PDF Supplementary Material PubReader ePub

Background

The concentration of particulate matter in the air varies depending on the region because it is lightweight and generated from a variety of sources. To assess the relationship between particulate matter and eye disease, this study analyzes the concentration data obtained from spatial analysis of particulate matter and emergency visit data.

Methods

The study included 769 residents of Daegu, Korea who had visited an emergency room for the problem of conjunctivitis or keratitis. Concentrations of PM₁₀ and other air pollutants were obtained from the Korean Ministry of the Environment. PM₁₀ concentrations and the number of patients from each of 143 administrative dongs (sub-municipal level administrative units) of the city of Daegu were obtained using spatial analysis. The patient distribution and PM₁₀ concentration were mapped for comparison, and their relationship was examined using scatter plot, regression analysis, and the independent sample t-test.

Results

The number of patients with conjunctivitis and keratitis was significantly higher in the regions of the top 20% areas than the bottom 20% areas in terms of PM₁₀ concentration. The distribution of PM₁₀ concentration and number of patients was visually similar on the map. The concentration of PM₁₀ and the number of patients showed a dose–response relationship. When the concentrations of other air polluta9nts were controlled for, the numbers of conjunctivitis and keratitis patients were 0.04 per 1000 ER patients and 0.10 per 1000 ER patients, respectively.

Conclusion

As PM₁₀ is associated with the prevalence of conjunctivitis and keratitis, measures to reduce particulate matter through environmental methods are needed.

Electronic supplementary material

The online version of this article (10.1186/s40557-018-0252-x) contains supplementary material, which is available to authorized users.

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International Journal of Molecular Sciences.2023; 24(4): 3911. CrossRef
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Research Article

Respiratory symptoms and illnesses related to the concentration of airborne particulate matter among brick kiln workers in Kathmandu valley, Nepal: Seshananda Sanjel, Sanjay N. Khanal, Steven M. Thygerson, William S. Carter, James D. Johnston, Sunil K. Joshi; Ann Occup Environ Med 2017;29:9. Published online March 27, 2017; DOI: https://doi.org/10.1186/s40557-017-0165-0

Abstract PDF PubReader ePub

Background

Bricks have been manufactured in Nepal for hundreds of years and are seen as a component of Nepalese sculpture and architecture. Large quantities of hazardous materials including high concentrations of particulate matter are emitted on a daily basis from brick kilns. Exposure to these hazardous materials can lead to adverse consequences on the environment and human health. This study was conducted to estimate the prevalence of respiratory symptoms/illnesses and the magnitude of respirable and total dust exposures among Nepalese brick kiln workers.

Methods

Respiratory symptoms/illnesses were evaluated by questionnaire among brickfield workers (n = 400) and a referent group of grocery workers (n = 400) in Kathmandu valley. Work zones (WZs): green brick molding (GBM), green brick stacking/carrying (GBS/C), red brick loading/carrying (RBL/C), coal preparation (CP) and firemen (FM) were the similar exposure groups (SEGs) from where personal air samples and interviews were taken. Among brickfield workers, personal monitoring was conducted across SEGs for total (n = 89) and respirable (n = 72) dust during February–March 2015 and March–April 2016. Applying multi-stage probability proportionate to size sampling technique, 16 kilns and 400 brick workers for interview were selected. Proportions, means, medians and ranges were calculated for the demographics, samples and respiratory symptoms/illnesses. One-way ANOVA was applied to compare the significance differences of the level of particulate matter among SEGs. Bivariate and multivariate logistic regression analysis were performed to evaluate association between respiratory symptoms/illnesses and participants groups, and SEGs among brick kiln workers at 0.05 level. Statistical analyses were performed using IBM SPSS Statistics 21.

Results

Chronic cough (14.3%), phlegm (16.6%) and bronchitis (19.0%) were higher (P < 0.05) among brickfield compared with grocery workers (6.8, 5.8 and 10.8%). Mean respirable (5.888 mg/m³) and total (20.657 mg/m³) dust exposures were highest for red brick loading tasks. The prevalence of chronic cough, chronic phlegm, chronic bronchitis, wheezing and asthma were significantly higher for other WZs workers (p < 0.05) compared with CP; for GBM: 22.9, 34.6, 15.0 and 7.5%; for GBS/C: 13.5, 15.8, 10.0, 8.8 and 7.5%; for RBL/C: 11.1, 17.1, 27.4, 19.0 and 11.9%; for FM: 18.4, 12.5, 28.4, 4.9 and 0.0%; and for CP: 4.9, 6.3, 13.3, 9.3 and 4.0% respectively.

Conclusion

High dust exposures identified in this study may explain the increased prevalence of respiratory symptoms/illnesses among Nepalese brickfield workers, warranting action to reduce exposures.

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Original Article

The Effects of Particulate Matter on Respiratory Function of Schoolchildren in Jeju: A Panel Study: Jae Yong Moon, Su Young Kim, Kwang Sik Park, Ho Kim, Chung Won Kang, Hyun Seung Park, Soo Hun Cho, Yun Chul Hong; Korean Journal of Occupational and Environmental Medicine 2009;21(3):218-224. Published online September 30, 2009; DOI: https://doi.org/10.35371/kjoem.2009.21.3.218

Abstract PDF

OBJECTIVE: To evaluate the changes in respiratory function associated with daily changes in particulate pollution.
METHODS
A total of 105 healthy schoolchildren of fourth and fifth grade elementary school age performed peak expiratory flow rates (PEFR) during 2 periods (May 14~June 15, Oct 22~Nov 23). We monitored concomitant ambient particulate matter (PM) levels during the periods.
RESULTS
An elevation PM(10) level of 1 microgram/m) led to decreases in PEFR of 0.20 L/min. A 1 microgram/m3 elevation of PM(2.5) led to a decrease of 0.36 L/min in PEFR. In addition, 1 day lag was associated with PM(10) levels and PEFR changes, and PM(2.5) showed the same result. The metal levels determined at PM(10) and PM(2.5) were found to be associated with decreased respiratory function.
CONCLUSIONS
An association between respiratory function and particulate pollution was observed when particulate pollutant levels were lower than the yearly average National Ambient Air Quality Standard in the Korea(50 microgram/m3).

Citations

Citations to this article as recorded by

Diesel Exhaust Particle Exposure and its Pulmonary Function Effects
Yong-Jin Lee, Da-Hye Kim, Soo-Hwan Kim, Jeong-Soo Kim, Dong-Chun Shin, Young-Wook Lim
Journal of Korean Society for Atmospheric Environment.2016; 32(5): 457. CrossRef

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