Background of the research:
Fine particulate matter (PM2.5), a type of air pollutant consisting of particles of 2.5 μm (1 μm is 1/1,000 of 1 mm) or less suspended in the atmosphere, is thought to cause respiratory and cardiovascular diseases. So far, research results have mainly been accumulated on the overall concentration of PM2.5 and its effects on health. Additionally, since PM2.5 is a mixed substance consisting of multiple components (carbon components, ionic components such as sulfate and nitrate ions, inorganic elemental components such as iron and aluminum, etc.), research is being conducted to determine whether the health effects of PM2.5 are caused by specific components. There are still fewer epidemiological studies on the relationship between the concentration of PM2.5 components and human health, compared to studies on the total mass concentration of PM2.5.
A research group consisting of Toho University, Keio University, the National Institute for Environmental Studies, the Tokyo Metropolitan Research Institute for Environmental Protection, and Hokkaido University used data on emergency medical care evacuations, which are indicators of acute illnesses and symptoms, and investigated whether daily fluctuations in the concentrations of specific PM2.5 components are related to the number of emergency medical care evacuations.
Environmental Science & Technology: May 24, 2022 issue
A case-crossover analysis of the association between exposure to total PM2.5 and its chemical components and emergency ambulance dispatches in Tokyo
Michikawa T*, Sasaki J, Yamazaki S, Takami A, Asakura K, Imamura H, Ueda K, Saito S, Hoshi J, Yoshino A, Sugata S, Nitta H, Nishiwaki Y.