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.
Bibliographical noteFunding Information:
This study was supported by grant from the Korean Academy of Asthma, Allergy and Clinical Immunology (KAAACI) and the Korea Asthma Allergy Foundation (KAF). National Health Information Data were provided by the National Health Insurance Service (NHIS) of Korea.
© Yonsei University College of Medicine 2019.
- National Health Insurance
- Particulate matter
ASJC Scopus subject areas