A Case-Crossover Analysis of the Association between Exposure to Total PM2.5and Its Chemical Components and Emergency Ambulance Dispatches in Tokyo

Takehiro Michikawa, Junichi Sasaki, Shin Yamazaki, Akinori Takami, Keiko Asakura, Haruhiko Imamura, Kayo Ueda, Shinji Saito, Junya Hoshi, Ayako Yoshino, Seiji Sugata, Hiroshi Nitta, Yuji Nishiwaki

Research output: Contribution to journalArticlepeer-review

Abstract

A limited number of studies have investigated the association between short-term exposure to PM2.5components and morbidity. The present case-crossover study explored the association between exposure to total PM2.5and its components and emergency ambulance dispatches, which is one of the indicators of morbidity, in the 23 Tokyo wards. Between 2016 and 2018 (mean mass concentrations of total PM2.513.5 μg/m3), we obtained data, from the Tokyo Fire Department, on the daily cases of ambulance dispatches. Fine particles were collected at a fixed monitoring site and were analyzed to estimate the daily mean concentrations of carbons and ions. We analyzed 1038301 cases of health-based all-cause ambulance dispatches by using a conditional logistic regression model. The average concentrations of total PM2.5over one and the previous day were positively associated with the number of ambulance dispatches. In terms of PM2.5components, the percentage increase per interquartile range (IQR) increase was 0.8% for elemental carbon (IQR = 0.8 μg/m395% CI = 0.3-1.3%), 0.9% for sulfate (2.1 μg/m30.5-1.4%), and 1.1% for ammonium (1.3 μg/m30.4-1.8%) in the PM2.5-adjusted models. This is the first study to find an association between some specific components in PM2.5and ambulance dispatches.

Original languageEnglish
Pages (from-to)7319-7327
Number of pages9
JournalEnvironmental Science and Technology
Volume56
Issue number11
DOIs
Publication statusPublished - 2022 Jun 7

Keywords

  • elemental carbon
  • emergency ambulance dispatches
  • fine particulate matter
  • short-term
  • sulfate

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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