August 2, 2023

Prevention of Heat-Related Illness in School Activities

The Education Policy Bureau and the Elementary and Secondary Education Bureauof the MEXT had issued the notification as an attachment on April 28, 2023.

We do appreciate if you can use this material as an appropriate reference source toassess heat-related illness risks optimally so as to prevent heat stroke in school
educational activities.

Contact:
The Office for a Professional Platform of Health and Hygiene Environment in
Schools for Foreign Students provided by MEXT (mediPhone, Inc)
Tel: 050-3187-8114 (Multilingual consultation service)
E-mail: hsfs@mediphone.jp1

(Tentative translation)(Attachment)This notification summarizes precautions to prevent heat-related illness in school educationalactivities. Heat-related illness can occur even in a period with a moderate temperature (25°C
to 30°C), thereby, all related parties should take appropriate actions to avoid health hazard
for elementary, junior high, and high school students.

Kanako Asato
The director of the Gender Equality, Cohesive
Society Learning and Safety Division of theEducation Policy Bureau, MEXT
Yuichi TokiwagiThe director of the School Curriculum Division of theElementary and Secondary Education Bureau, MEXT

Preventing Heat-Related Illness in School Educational Activities
We appreciate your continuous efforts for reducing heat-related illness risks toprevent heat stroke in each school every year. Unfortunately, there were more than
3,142 heatstroke cases under the control of schools in 2022 school year. Consideringa recent climate change and an incidence of heat illness, we must initiate taking
appropriate measures even in a period with moderate temperature (25°C to 30°C)
and properly assess potential heat-related illness risks using Wet Bulb Globe
Temperature (WBGT).
In this school year, schools will plan and conduct a wider range of activities thanthose in last year. We summarize precautions to remind each school and school
owners/administrators about them. We do hope you will take appropriate actions toprevent heat-related illness.
We wish to add that we have been sharing this information with the Japan Medical
Association so that they can respond to you, school owners/administrators when you
seek their help about heat-related illness.
"The Act of Partial Amendment to Climate Change Adaptation Act and theEnvironmental Restoration and Conservation Agency Act" was established on April
28 2023 at the 211th ordinary session of the Diet (this will come into force on theday specified by Cabinet Order within a year after promulgation, excluding theprovisions of Heat Illness Prevention Action Plan.).
We will announce additional information on heat illness prevention measures
based on the Act soon.
Notification
1.

Maintenance of an Optimal Environment to Prevent Heat-Related Illness
Heat-related illness has a potential risk of being life-threatening, though it ispreventable by maintaining an optimal environment. Please pay attention to the following
points and encourage all related parties to prevent heat-related illness in students.
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Encourage students to drink adequate volume of fluids before starting activities, andpromote fluid and salt intake as needed.
Promote students to hydrate themselves and consume salt during and after activities.
If symptoms suggesting of any heat exhaustion/stroke symptoms are noted, pleasetake appropriate measures such as fluid and salt replenishment, reducing bodytemperature, transferring to the hospital as quickly as feasible.
Most cases of heat-related illness under the control of the school were observed
during physical education or sports activities. While, some cases had occurred in
non-sports club activities and indoor class activities, and when students weretraveling to and from school. Moreover, heat exhaustion is likely to develop when
individuals fail to calibrate heat tolerance, such as in early seasons with increasing
temperature or on the days drastically getting hotter, or in weather conditions withmoderate temperature (25°C to 30°C) but much humidity and weather with other risk
factors. Considering these facts mentioned above, regardless of the extent of school
curriculum, please take appropriate measures early to prevent heat-related illness.
Air-conditioning systems have been increasingly installed in school facilities. Eachschool should use such systems; in addition, consider the variability in airconditioning equipment between classrooms, special-purpose classrooms, and agymnasium. Depending on installation/non-installation of air-conditioners in activity
locations, activities have to be planned.
Combination of enhancing air-conditioning, heat-insulating properties, airtightness
and necessary ventilations is effective for improving an indoor environment. Whilereferring to "Examples of establishing eco-schools" (March 2020), please takemeasures such as using sunshades to protect students from the sunlight to facilitate
an optimally ventilated environment.
Children left on school bus are likely to suffer from heat-related illness, resulting inlife-threatening condition. Preschools must pay careful attention to such a potential
risk of heat illness events and ensure monitoring where children are located, toprevent leaving children inside the school bus. As an outcome, Japanese government
has supported schools to install safety systems in the school bus as a device to prevent
human error through 2022 via a second supplementary budget. Preschools arerecommended to have completed installation of safety devices by the end of June asmuch as possible. In addition, prior to completion of installation of the safety devices,
please make sure to take all necessary preventative actions such as preparing andusing a children's boarding checklist in school bus to ensure that no child is left insidea school bus.
For wearing a mask in a school, COVID-19 Infection Control Manuals andGuidelines for Schools describes that "In school educational activities, students,teachers, and staff basically do not need wear masks" and "Infants are not required
to wear masks." Accordingly, each school should respond to each cases properly
from the viewpoint of heat illness prevention.

2.

Making Judgements to Conduct/Suspend School Activities
Anticipating suspension of activities in scorching weather to prevent heat illness,each school is recommended to specify the suspension criteria and an evaluator in acrisis management manual beforehand and share the information among schoolstaff/teachers. To assess the risk of heat illness, Wet Bulb Globe Temperature(WBGT), one of the indices representing the heat stress, should be available.
3You can check measured and estimated WBGT indices in each region on "HeatIllness Prevention Information" presented by the Ministry of the Environment . This
information website also updates the Heat Stroke Alert issued by the Ministry of theEnvironment and Japan Meteorological Agency ("Heat Stroke Alert" is informationthat calls attention to dangerous heat and encourages people to take actions toprevent heat illness when the risk of heat illness is predicted to be extremely high(when the WBGT heat stress index forecast is over 33). This information release
was started on April 26 2023.)
Also, the Ministry of the Environment and the Ministry of Education, Culture,Sports, Science and Technology prepared "Guidance About Developing a Guideline for
Heat Illness Measures in Schools" together in May 2021, which helps school
owners/administrators such as local boards of education to formulate and revise
guidelines on heat illness measures for schools.
Please refer to the information and make judgements appropriately toconduct/suspend school activities.

3.

Instructions as to Heat Illness Prevention among Students
To prevent heat-related illness, schools should give adequate instructions tostudents depending on their growth and development levels so as to allow them toregulate their health condition by themselves.
Please note the following points of instructions to students and also refer to"School Security Materials; Safety Education in Schools Fostering 'the Power toLive'" (revised by the Ministry of Education, Culture, Sports, Science andTechnology in March 2019).
Wear a hat/cap and dress lightly during hot weather
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Stay hydrated during exercise and take breaks
Check own health condition before exercise
Communicate among students to stay hydrated, and please call the attentionof school staff/teachers immediately while feeling any health abnormalities

4.

Managing Summer Vacation
Schools should appropriately determine a period of summer vacation inaccordance with related provisions specified in reference document No. 2, referring
to (1) and (2) as follows.
(1) Each school owner/administrator and school should decide to extend a summer
vacation period or plan temporary holidays in summer as well as to shorten theperiod of winter vacation and the end/start of a school year vacation as needed,based on weather conditions and installation/non-installation of air-conditionersin school facilities (classrooms, special-purpose classrooms, and a gymnasium)
upon due consideration to ensure the ‘health status’ of students.
At that time, use reference materials described in "reference items" at the endof this notification to make judgements based on school and local situation.
(2) Please take into consideration that "Under an emergency disaster and otherurgent situation" specified in Article 63 of the Enforcement Regulations of theSchool Education Law (1947 Ordinance of the Ministry of Education No.11)
include any cases requiring responses to prevent heat-related illness.

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[Reference items]○ The Ministry of the Environment"Heat Illness Prevention Information" website
https://www.wbgt.env.go.jp/

"Heat Illness Environmental Health Manual 2022" (revised in March 2022 bythe Ministry of the Environment)
https://www.wbgt.env.go.jp/heatillness_manual.php

Launching "Heat Stroke Alerts" in fiscal year 2023
https://www.env.go.jp/press/press_01497.html

The cabinet decision on the bill to partially amend the Climate Change
Adaptation Act and the Act on the Environmental Restoration and Conservation
Agencyhttps://www.env.go.jp/press/press_01231.html○ MEXT
Guidelines to assess and review "Crisis Management Manual" in schools
https://anzenkyouiku.mext.go.jp/mextshiryou/data/kikikanri/kikikanri-all.pdf#page=49

Formulation of "Guidance About Developing a Guideline for Heat Illness
Measures in Schools"

https://www.mext.go.jp/a_menu/kenko/anzen/1401870_00001.htm

School Security Materials: Safety Education in Schools Fostering "thePower to Live" (revised in March 2019)https://www.mext.go.jp/a_menu/kenko/anzen/1416715.htm

Support programs on safety and security measure for children (subsidies for school bus
repair)https://anzenkyouiku.mext.go.jp/mextshiryou/data/torikumi/kodomoanzen/kodomotaisaku
gaiyou2.pdf

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Examples of establishing eco-schools
https://www.mext.go.jp/b_menu/shingi/chousa/shisetu/044/toushin/1421996_00001.ht m○ Japan Sport Council
Heat illness prevention (Accident prevention measures in schools)
https://www.jpnsport.go.jp/anzen/anzen_school/bousi_kenkyu/tabid/337/Default.aspx5