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Background <p>Particulate matter with an aerodynamic diameter of ≤2.5 µm (PM<sub>2.5</sub>) is a heterogeneous mixture, and specific substances that affect cardiovascular events remain unknown. We aimed to examine the association of short-term exposure to PM<sub>2.5</sub> and its components with hospital admissions for acute myocardial infarction (AMI).</p> Methods <p>The concentrations of total PM<sub>2.5</sub> and its individual components were continuously measured using Aerosol&#xa0;Chemical Speciation Analysers. From a national-scale administrative database collected from 828 facilities in 47 prefectures across Japan from April 2017 to December 2019, we extracted AMI data for seven prefectures where these aerosol analysers were installed. The primary outcome was the relationship of PM<sub>2.5</sub> and its components with AMI hospitalisation. A time-stratified case-crossover analysis was conducted, and the approximate risk of AMI by pollutant concentrations was estimated using a conditional logistic regression model. In total, 44,232 patients with AMI aged 40–104 years (74.9% male) were examined.</p> Results <p>The estimated effect of an increase in the total PM<sub>2.5</sub> concentration is significantly associated with AMI-related hospitalisation. Upon further examination of the components of PM<sub>2.5</sub>, black carbon has a more substantial influence on AMI development than water-soluble organic compounds, nitrate, and sulphate ions.</p> Conclusions <p>Short-term exposure to PM<sub>2.5</sub> is associated with an increased incidence of AMI. Future research prioritises the components of PM<sub>2.5</sub>, with particular focus on whether a decrease in black carbon concentrations can mitigate the risk of future air quality-related AMI.</p>

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Components of particulate matter as potential risk factors for acute myocardial infarction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月4日

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  • Sunao Kojima,
  • Takehiro Michikawa,
  • Ayako Yoshino,
  • Kenichi Tsujita,
  • Takanori Ikeda,
  • Yuji Nishiwaki,
  • Akinori Takami

摘要

Background

Particulate matter with an aerodynamic diameter of ≤2.5 µm (PM2.5) is a heterogeneous mixture, and specific substances that affect cardiovascular events remain unknown. We aimed to examine the association of short-term exposure to PM2.5 and its components with hospital admissions for acute myocardial infarction (AMI).

Methods

The concentrations of total PM2.5 and its individual components were continuously measured using Aerosol Chemical Speciation Analysers. From a national-scale administrative database collected from 828 facilities in 47 prefectures across Japan from April 2017 to December 2019, we extracted AMI data for seven prefectures where these aerosol analysers were installed. The primary outcome was the relationship of PM2.5 and its components with AMI hospitalisation. A time-stratified case-crossover analysis was conducted, and the approximate risk of AMI by pollutant concentrations was estimated using a conditional logistic regression model. In total, 44,232 patients with AMI aged 40–104 years (74.9% male) were examined.

Results

The estimated effect of an increase in the total PM2.5 concentration is significantly associated with AMI-related hospitalisation. Upon further examination of the components of PM2.5, black carbon has a more substantial influence on AMI development than water-soluble organic compounds, nitrate, and sulphate ions.

Conclusions

Short-term exposure to PM2.5 is associated with an increased incidence of AMI. Future research prioritises the components of PM2.5, with particular focus on whether a decrease in black carbon concentrations can mitigate the risk of future air quality-related AMI.