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Aging changes such as the official announcement number of times of photochemical smog alarm

In this page, we show aging change of health toll that there were the official announcement number of times and report of announced photochemical smog alarm and warning in Yokohama-shi to date.

Last update date November 6, 2020

The outbreak situation of photochemical smog

 Environmental standard is set about the density of photochemical oxidant becoming index whether or not photochemical smog is generated, but there is little measurement station to adapt to environmental standard even if we see nationwide. There is the measurement station measuring photochemical oxidant in the whole country as 1,200 stations, but there is in six stations in year called 0 stations even in year when there is many what adapts to environmental standard soon.
 Kanagawa establishes about official announcement standards such as photochemical smog alarms.

  • The number of times such as photochemical smog alarms to occur greatly depends on summer climatic condition (intense heat, cold summer, the long rain, dry rainy season) and tend that there is few in most, year of cold summer in year of intense heat a year. Therefore, change is in the number of times of photochemical smog alarm announced in Yokohama city limits by the year.
  • It is 20 times of 1973 (Showa 48) that had most official announcement number of times of photochemical smog alarm.
  • Photochemical smog warning was announced twice (1975 and 1978) so far in Yokohama-shi.
  • Warning has been never announced in serious emergency so far in Kanagawa.

Healthy toll

  • In late years, as for the number of health victims that there was report in Yokohama-shi, there were 59 in two, 2013 in 166, 2008 and 2009 in 226 people, 2006 in 2005.
  • It is 6,175 people of 1975 (Showa 50) that had most report tolls.

Aging change

Aging changes such as the official announcement number of times of photochemical smog alarm

Secular variation
The yearThe warning official announcement number of times (time)The warning official announcement number of times (time)Report toll (people)
1971802,337
1972100834
19732001,545
197490205
19751216,175
197670823
197730909
197811161
197940268
1980300
198180454
1982203
198330178
19844065
198560113
1986200
1987120136
1988207
1989200
1990500
199150340
199210090
1993300
19948012
19951100
1996500
1997300
1998400
1999200
2000604
2001800
2002605
2003400
20041001
200550226
2006110166
20071300
2008602
2009202
2010600
2011400
2012200
201312059
2014500
2015600
2016200
2017500
2018400
2019300
2020100
Total305215,020
The yearThe warning official announcement number of times (time)The warning official announcement number of times (time)Report toll (people)

The official announcement situation of the latest photochemical smog alarm is this.

Inquiry to this page

Environmental Planning Bureau environment Maintenance Division Environment Administration Division

Telephone: 045-671-3507

Telephone: 045-671-3507

Fax: 045-641-3580

E-Mail address [email protected]

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