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Information on Particulate Matter (PM 2.5)

[2013年3月11日]

 Kyōto Prefecture has set up 22 stations throughout the prefecture for daily monitoring of atmospheric pollution, including microscopic particulate matter (PM 2.5). Results from this monitoring are made available on the Kyōto Prefecture website.

 Within Seika, there is one such station, located at Seihoku Elementary School.

 PM 2.5 measurements up through the previous day are made available through the following link. Measurements on days when the Kyōto Prefectural Office is closed will be posted the next day that the office is open.

http://www.pref.kyoto.jp/taiki/1111111.html (Japanese only) 

What Is PM 2.5?

 PM 2.5 is the common name for microscopic particulate matter. It refers to especially small particles (2.5μm or less in diameter) among airborne particulate matter.

 Due to its small size, it is easy for PM 2.5 to enter the lungs, and is hence thought to have harmful effects for people with respiratory or circulatory conditions. In Western countries, there is a specific limit of PM 2.5 that is considered healthy. Based on these standards, Japan has also declared standards of levels of PM 2.5 considered healthy as of September 2009.

※1μm (micrometer) = 1/1000 of a millimeter

Environmental Standards

 The environmental standard is defined as the standard which preserves human health and living environment. The environmental standard for PM 2.5 as declared in September 2009 is as follows.

※Temporary excess of environmental standards does not necessarily signify a direct impact on human health.

Environmental Standard for PM2.5
Matter  Environmental Standard
 Microscopic Particulate Matter (PM 2.5) Yearly average of 15 μg/m3 or less, and daily average of 35 μg/m3 or less 

※1μm (micrometer) = 1/1000 of a millimeter

Types of PM 2.5

 PM 2.5 is classified into different types based on method of emission.
Types of PM2.5
 Name Method of Emission
 Primary particle Directly emitted from source (soot, smoke, etc.)
 Secondary particle

 Formed from gases via photochemical reaction

Constituent gases:

・Volatile organic compounds (VOC)

・Nitrogen oxide (NOx)

・Sulfur oxide (SOx)

Alerts

 The national government has set a daily average concentration of 70 μg/m3 as a temporary guideline separate from regular environmental standards. On days when the average concentration is expected to exceed that level, Kyōto Prefecture may issue alerts such as the following.

  • Avoid outdoor activity
  • Minimize strenuous outdoor exercise or other outdoor activity that lasts for a long time
  • When indoors, minimize flow of air from outside and opening of windows
  • More stringent measures for people with respiratory or circulatory conditions, the elderly, and children

問い合わせ

Town of Seika; Department of Public Health, Welfare, and the Environment; Environmental Promotion Office; Environmental Affairs Division
精華町 健康福祉環境部(けんこうふくしかんきょうぶ) 環境推進室(かんきょうすいしんしつ) 環境係(かんきょうがかり)
TEL: 0774-95-1925 FAX: 0774-95-3974

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