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Heat and Cold Stress Course 2026

This course is for security guards and other workers in Canada who work outdoors or in very hot or cold places. It covers how heat and cold affect the body, the warning signs of heat illness and cold injury, first steps to take and how to prevent harm. It is background knowledge only and does not replace a first aid course or your employer's heat and cold plans.

  • 课程
  • 加拿大
  • 25道题
  • 核对于2026年10月13日

快速解答

这门免费课程包含约25分钟的课文和一套25道题的测试。得分达到80%或以上即可下载结业证书（私人颁发，未经认证）。 已于2026年10月13日根据官方资料核对。

从课文开始Heat and Cold Stress Course: Lessons：阅读时间约25分钟。测试中的每道题在课文中都有讲解。

你将学到什么

  • Explain heat stress, humidex and wind chill in plain terms
  • Recognize the signs of heat exhaustion and heat stroke
  • Take the right first steps for heat stroke and hypothermia
  • Prevent heat stress with water, acclimatization and planning
  • Recognize frostnip, frostbite and trench foot
  • Dress in layers and plan warm-up breaks for cold work

得分达到80%或以上即可下载证书。

  1. 第1题，共25题

    What is a normal core body temperature for a healthy person?
    显示答案

    答案: A. About 37°C

    CCOHS says the body normally keeps its core temperature near 37°C. A change of more than 1°C signals a problem.

  2. 第2题，共25题

    In workplace safety, what does "heat stress" mean?
    显示答案

    答案: B. The total heat load on a worker from work, surroundings and clothing

    CCOHS describes heat stress as the overall heat load from metabolic heat, environmental factors and clothing.

  3. 第3题，共25题

    What does the humidex tell you?
    显示答案

    答案: D. How hot it feels when heat and humidity combine

    Humidex estimates how hot people feel when warm temperatures and humidity combine, much like wind chill does for cold.

  4. 第4题，共25题

    According to CCOHS, what does a humidex of 46 or higher mean?
    显示答案

    答案: B. Dangerous; heat stroke possible

    CCOHS rates a humidex of 46 and over as dangerous, with heat stroke possible.

  5. 第5题，共25题

    Ontario's heat stress guidance points to a general duty in the OHS Act. What does that duty require of employers?
    显示答案

    答案: A. To take every reasonable precaution to protect workers

    Ontario's guidance says employers must take every reasonable precaution in the circumstances to protect workers, which may include protection from heat stress.

  6. 第6题，共25题

    Under BC's OHS Regulation, what must an employer do where workers may face heat stress?
    显示答案

    答案: C. Do a heat stress assessment and make an exposure control plan

    Section 7.29 of BC's OHS Regulation requires a heat stress assessment and a heat stress exposure control plan.

  7. 第7题，共25题

    A worker has sharp muscle pains after sweating heavily on a hot day. Which heat illness is most likely?
    显示答案

    答案: A. Heat cramps

    CCOHS says heat cramps are caused by a salt imbalance from heavy sweating. Move to a cool area and drink fluids.

  8. 第8题，共25题

    Which set of signs best fits heat exhaustion?
    显示答案

    答案: B. Heavy sweating, pale moist skin, nausea and thirst

    CCOHS lists heavy sweating, weakness, dizziness, nausea, headache, thirst and pale, cool, moist skin as signs of heat exhaustion.

  9. 第9题，共25题

    A guard on a hot site becomes confused and starts acting strangely. What should you do first?
    显示答案

    答案: C. Call 911, then start cooling them right away

    Confusion and odd behaviour in the heat point to heat stroke, a medical emergency. Call 911 and cool the person while you wait.

  10. 第10题，共25题

    A worker who was doing hard physical work collapses in the heat but is still sweating. Can it be heat stroke?
    显示答案

    答案: B. Yes, sweating does not rule out heat stroke

    CCOHS notes that exertional heat stroke, after hard work or exercise, often comes with sweating, so sweat does not rule it out.

  11. 第11题，共25题

    While waiting for paramedics for a person with heat stroke, where should you put cold, wet cloths or ice?
    显示答案

    答案: A. Head, neck, armpits and groin

    CCOHS first aid for heat stroke includes cold, wet cloths or ice on the head, neck, armpits and groin, after calling 911.

  12. 第12题，共25题

    How much water does CCOHS suggest a worker drink in hot conditions?
    显示答案

    答案: D. About 250 mL every 20 minutes

    CCOHS suggests about one cup (250 mL) every 20 minutes, even without thirst, and no more than 1.5 litres an hour.

  13. 第13题，共25题

    In hot work, what does "acclimatization" mean?
    显示答案

    答案: A. The body adjusting to heat over several days

    Acclimatization is the set of changes in the body after several days of heat exposure that help it cope with heat.

  14. 第14题，共25题

    CCOHS suggests a new worker in a hot job start at what level of heat exposure on day 1?
    显示答案

    答案: D. No more than 20% of normal

    CCOHS suggests no more than 20% exposure on day 1, adding no more than 20% on each extra day.

  15. 第15题，共25题

    Ontario's guidance says a worker who has been away for how long needs time to re-adjust to heat?
    显示答案

    答案: C. 9 days or more

    Ontario's heat stress guidance says workers returning after being ill or away for 9 or more days need to re-adjust to the heat gradually.

  16. 第16题，共25题

    When is the best time to schedule heavy outdoor tasks on a hot summer day?
    显示答案

    答案: D. In the cooler morning or evening

    CCOHS and Ontario both advise moving strenuous work to cooler times of the day.

  17. 第17题，共25题

    At what core body temperature does hypothermia begin?
    显示答案

    答案: D. Below 35°C

    CCOHS says hypothermia happens when the core body temperature falls below 35°C.

  18. 第18题，共25题

    Which is a safe way to help a person with hypothermia while waiting for help?
    显示答案

    答案: C. Warm their chest, armpits and groin with blankets

    CCOHS says to handle the person gently, warm the upper body such as the chest, armpits and groin, not rub the skin and not rewarm too quickly with a hot bath.

  19. 第19题，共25题

    Frostnip is best described as what?
    显示答案

    答案: D. A warning that frostbite is beginning

    CCOHS calls frostnip the mildest freezing injury and a warning that frostbite is beginning.

  20. 第20题，共25题

    A co-worker's frostbitten fingers could freeze again before you reach shelter. What should you do?
    显示答案

    答案: C. Do not thaw them until refreezing is no longer a risk

    CCOHS says do not thaw a frostbitten area if it may freeze again, do not rewarm it on site, and never rub it or apply snow.

  21. 第21题，共25题

    Trench (immersion) foot can happen at temperatures as high as about what?
    显示答案

    答案: B. 15.5°C

    CCOHS says trench foot can happen at temperatures as high as 15.5°C if the feet stay wet.

  22. 第22题，共25题

    Why is cotton not a good layer next to the skin for cold work?
    显示答案

    答案: D. It gets damp quickly and stops keeping you warm

    CCOHS does not recommend cotton because it gets damp quickly. Wool and synthetic fibres keep their insulation when wet.

  23. 第23题，共25题

    Below what temperature does CCOHS recommend mittens instead of gloves?
    显示答案

    答案: B. Below -17°C

    CCOHS recommends gloves for light work below 4°C and moderate work below -7°C, and mittens below -17°C.

  24. 第24题，共25题

    In BC, a nearby heated shelter must be available when the equivalent chill temperature drops below what?
    显示答案

    答案: D. -7°C

    Section 7.36 of BC's OHS Regulation requires a nearby heated shelter when the equivalent chill temperature is below -7°C.

  25. 第25题，共25题

    Why should workers avoid alcohol when working in the cold?
    显示答案

    答案: B. It gives a false feeling of warmth

    CCOHS says alcohol creates a false sense of warmth and increases the risk of cold injury.

考前须知

  • Heat stroke is a medical emergency. Body temperature is often above 40°C. Call 911 and start cooling the person.
  • CCOHS suggests drinking about 250 mL of water every 20 minutes in the heat, even if you are not thirsty.
  • Hypothermia begins when core body temperature falls below 35°C.
  • BC requires heat and cold stress assessments and control plans where there is a risk (OHS Regulation ss. 7.29 and 7.34).
  • Ontario's heat stress guidance says employers must take every reasonable precaution to protect workers, which may include protection from heat stress.

常见问题

What is the difference between heat exhaustion and heat stroke?

Heat exhaustion causes heavy sweating, weakness, nausea and pale, moist skin. Heat stroke is more serious: the person may be confused, collapse or have a seizure. Heat stroke is a medical emergency, so call 911.

How do I prevent frostbite on a winter patrol?

Dress in layers, cover your ears, wear mittens in deep cold, keep clothing dry and take warm-up breaks. Never ignore numbness, which is often the first sign.

Does this course count as first aid training?

No. It is background knowledge only. First aid for heat stroke and hypothermia is taught in a first aid course, and your province's OHS rules decide what first aid training your workplace needs.

Is there a temperature at which work must stop in Canada?

There is no single national cut-off. Each province and territory sets its own rules. For example, BC uses assessments and control plans, while Ontario points to the employer's duty to take every reasonable precaution.

这份证书是否经过认证或获得官方认可？

不是。这是一份私人颁发的结业证书，仅用于知识学习。它未获得任何政府、执照发放机构、监管机构或教育机构的认可、认证或批准，也不能替代法律要求的任何执照、资格证书或培训。

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