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KMID : 0311120190600100952
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Yonsei Medical Journal
2019 Volume.60 No. 10 p.952 ~ p.959
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The Effects of Short-Term and Very Short-Term Particulate Matter Exposure on Asthma-Related Hospital Visits: National Health Insurance Data
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Song Dae-Jin
Choi Sun-Hee
Song Woo-Jung
Park Kyung-Hee
Jee Young-Koo
Cho Sang-Heon
Lim Dae-Hyun
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Abstract
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Purpose: The purpose of this study was to investigate the effects of short-term and very short-term exposure to particulate matter (PM) exceeding the daily average environmental standards for Korea (≤100 μg/m3 for PM10 and ≤50 μg/m3 for PM2.5) on on asthma-related hospital visits.
Materials and Methods: This was a population-based, case-crossover study using National Health Insurance and air pollution data between January 1, 2014 and December 31, 2016. The event day was defined as a day when PM exceeded the daily average environmental standard (short-term exposure) or daily average environmental standard for 2 hours (very short-term exposure). The control day was defined as the same day of the week at 1 week prior to the event day.
Results: Compared with control days, asthma-related hospital visits on the 24-hr event days and 2-hr event days increased by 4.10% and 3.45% for PM10 and 5.66% and 3.74% for PM2.5, respectively. Asthma-related hospital visits increased from the 24-hr event day for PM10 to 4 days after the event day, peaking on the third day after the event day (1.26, 95% confidence interval, 1.22?1.30). Hospitalizations also increased on the third day after the event. While there was a difference in magnitude, PM2.5 exposure showed similar trends to PM10 exposure.
Conclusion: We found a significant association between short-term and very short-term PM exposure exceeding the current daily average environmental standards of Korea and asthma-related hospital visits. These results are expected to aid in establishing appropriate environmental standards and relevant policies for PM.
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KEYWORD
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Particulate matter, asthma, outpatients, National Health Insurance
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