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Toolbox Talk: Heat Stress Prevention

Date: [DATE] Duration: [DURATION] minutes Presenter: [PRESENTER NAME] Location: [LOCATION]

Objective

The objective of this toolbox talk is to educate employees on the risks of heat stress, how to recognize its symptoms, and the steps they can take to prevent heat-related illnesses. By the end of this talk, participants should be able to identify risk factors, implement control measures, and respond appropriately to heat-related emergencies.

Introduction

Heat stress is a significant workplace hazard, especially for those involved in strenuous physical activity [1]. When the body can't cool itself effectively, core temperature rises, leading to heat-related illnesses [1]. It’s crucial to understand how environmental factors combine with metabolic heat to create dangerous conditions [1]. Recent incidents and the deadly heat wave of June 2021 underscore the need for clear guidelines and preventative measures [2].

Presenter Note: Engage the audience by asking if anyone has personal experience related to heat stress or has witnessed a heat-related incident.

Key Points

  • Stay Hydrated: Drink small quantities of water frequently, up to 32 ounces per hour, especially when sweating more than usual [3].
  • Recognize Symptoms: Know the signs of heat exhaustion, dehydration, heat cramps, and heat stroke [4]. Early recognition can prevent serious complications.
  • Take Breaks: Utilize shaded or climate-controlled areas to cool off and recover [5]. Preventative rest breaks are essential when the heat index is high [3].
  • Acclimatize: Gradually adapt to working in the heat over a period of 7 to 14 days [6]. This is especially important for new employees or those returning from extended absences [5].
  • Communicate: Report any signs or symptoms of heat illness in yourself or others to your supervisor immediately [3].

Hazard Identification

Heat stress can lead to several hazards, including:

  • Dehydration: Insufficient fluid intake can lead to dizziness, fatigue, and impaired cognitive function [5].
  • Heat Exhaustion: Symptoms include heavy sweating, weakness, headache, nausea, and vomiting, potentially leading to heat stroke if not addressed [4].
  • Heat Stroke: A life-threatening condition with symptoms such as high body temperature, confusion, seizures, and loss of consciousness [6].

Presenter Note: Encourage participants to share any additional hazards they've encountered related to heat stress.

Control Measures

The hierarchy of controls should be implemented to minimize heat stress risks:

  • Elimination: Reschedule work during cooler parts of the day to avoid peak heat hours [7].
  • Engineering Controls: Use fans, air conditioning, or ventilation systems to reduce heat exposure [7].
  • Administrative Controls: Implement work/rest schedules, provide acclimatization periods, and ensure proper training 3, 17.
  • Personal Protective Equipment (PPE): Use cooling vests, water-dampened clothing, or other cooling measures when engineering and administrative controls are insufficient [7].

Safe Work Procedures

  1. Monitor the heat index using tools like the OSHA-NIOSH Heat Safety Tool app 4, 15.
  2. Ensure access to cool, potable water at all times 3, 7.
  3. Provide frequent opportunities and encouragement to drink water [5].
  4. Use a buddy system to monitor each other for signs of heat illness [8].
  5. Take regular breaks in shaded or climate-controlled areas [5].

Presenter Note: If possible, demonstrate the proper use of cooling equipment or show examples of effective shade structures.

Personal Protective Equipment (PPE) Requirements

  • Cooling Vests: Use cooling vests with fans or ice packs to help regulate body temperature, especially in high-heat conditions [7].
  • Water-Dampened Clothing: Wear water-dampened cotton clothing to promote cooling through evaporation [7].
  • Appropriate Clothing: Choose lightweight, light-colored, and loose-fitting clothing to minimize heat retention [5].

Emphasize the importance of removing heat-retaining PPE, such as chemical-resistant suits, during rest periods [6].

Real-World Example or Case Study

[Provide a detailed description of a relevant real-world scenario or case study]

[Discuss what went wrong or right, and the lessons learned]

Presenter Note: Ask participants if they can relate this example to their own experiences.

Group Discussion

Discuss the following questions:

  1. What are the early signs of heat stress that you should watch for in yourself and others?
  2. What steps can we take to improve our current heat stress prevention measures?
  3. How can we ensure that everyone is taking breaks and staying hydrated?

Presenter Note: Encourage active participation and facilitate the discussion.

Emergency Procedures

Outline the steps to take in case of an emergency related to heat stress:

  1. Recognize the signs and symptoms of heat illness [3].
  2. Move the affected person to a cool, shaded area [5].
  3. Provide cool water or electrolyte-replenishing beverages [7].
  4. Cool the person down with water or ice packs [7].
  5. Call for emergency medical services if the person's condition worsens or if they lose consciousness [8].

Questions and Answers

Encourage participants to ask questions.

Provide answers to common questions related to heat stress:

  • Q: What is acclimatization and why is it important?

A: Acclimatization is the gradual adaptation of the body to working in the heat, which typically takes 7 to 14 days. It helps improve tolerance to heat and reduces the risk of heat-related illnesses [6].

  • Q: How often should we be drinking water during hot weather?

A: You should aim to drink small quantities of water frequently, up to 32 ounces per hour, especially when you are sweating more than usual [3].

  • Q: What should we do if we see a coworker exhibiting signs of heat exhaustion?

A: Immediately move the person to a cool, shaded area, provide water, and monitor their condition. If their condition worsens, call for emergency medical services [8].

Summary

Recap the main points covered in the toolbox talk:

  • Heat stress is a serious workplace hazard that can lead to severe health consequences [1].
  • Prevention involves staying hydrated, taking breaks, and recognizing the symptoms of heat illness 3, 8.
  • Implement control measures such as engineering controls, administrative controls, and PPE to minimize heat exposure [7].
  • Report any signs of heat illness immediately and follow emergency procedures [3].

Action Items

List specific actions participants should take following this toolbox talk:

  1. Review the company's heat illness prevention plan [5].
  2. Familiarize yourself with the location of shade and cooling areas 3, 6.
  3. Download the OSHA-NIOSH Heat Safety Tool app on your phone 4, 15.

Remember: Stay cool, stay hydrated, and stay safe!

Report all hazards, near-misses, and incidents to your supervisor immediately.

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8 source record(s)

Sources used for this answer

[1] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 988

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Oregon Occupational Safety and Health Division Oregon Administrative Rules AO 1-2025 Division 2 - (c) The shade must be located as close as practical to the areas where employees are working. - (d) Shade present during meal periods must be large enough to accommodate the number of employees on the meal period that remain onsite. - (e) If trees or other vegetation are used to provide shade, such as in orchards or forests, the thickness and shape of the shaded area must provide sufficient shadow to protect employees. - Exception: When the employer can demonstrate that providing access to shade is not safe or it interferes with the ability of employers and employees to complete the necessary work in a particular situation, for example, during high winds or when an employee is walking through range land, employers must identify and implement alternative cooling measures that provide equivalent protection such as providing cooling vests (either with fans or ice packs), water-dampened cotton clothing, or similar effective measures. The Heat Illness Prevention Plan under section (8) must include the use, care, and maintenance of the alternative cooling methods, in writing. - (4) Drinking water. Ensure that a sufficient supply of drinking water is immediately and readily available to exposed employees at all times, at no cost, when the heat index in the work area equals or exceeds 80 degrees Fahrenheit. - (a) Supplied drinking water must be either cool or cold, see subsection (2)(b). - (b) Supply each employee with enough drinking water to enable them to consume up to 32 ounces per hour. Employers are not required to supply the entire quantity of drinking water needed for all employees on a full shift at the beginning of the shift. Employers may begin the shift with smaller quantities of drinking water when effective procedures are established to replenish the water consumed during the shift. - (c) Employees must have ample opportunity to drink water required under this…

[2] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 989

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Source excerpt

J Division 2 AO 1-2025 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (a) Communication must occur in a language and vocabulary readily understood by all employees, by voice, electronic, or other equally-effective means, so that employees at the worksite can contact a supervisor at any time, when necessary. An electronic device, such as a cell phone, may be used for this purpose only if reception in the area is constant and reliable. - (b) Implement one or more of the following to promptly identify any employee suspected of experiencing heat-related illness: - (A) Regular communication with employees working alone, such as by radio, cellular phone, or other alternative means; - (B) Create a mandatory buddy system; or - (C) Implement other equally-effective means of observation or communication. - (c) Designate and equip one or more employees at each worksite as authorized to call for emergency medical services, and allow other employees to call for emergency services when designated employees are not immediately available; such a practice supplements existing requirement to ensure that emergency medical care is immediately available in all workplaces, as required by OAR [redacted phone](4), 29 CFR 1910.50, or OAR [redacted phone]. - (d) When employees work in buildings and structures that do not have a mechanical ventilation system, employers must: - (A) Directly measure the temperature and humidity in these places at the same time and location when occupied by employees to determine the current indoor heat index; - (B) Use the National Institute for Occupational Safety and Health's (NIOSH) Heat Safety Tool app to determine the heat index outside of the building or structure and assume that it is the same inside (See section 2 in Appendix A: Mandatory Information for Heat Illness Prevention); or - (C) If the structure is designed or otherwise known to be affected by outdoor humidity, for example, hoop houses and greenhouses in nurs…

[3] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 1013

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Source excerpt

J Division 2 AO 1-2025 Oregon Administrative Rules Oregon Occupational Safety and Health Division In July, 2015 Oregon OSHA reposed rules for Electric Power Generation, Transmission, and Distribution. Three public hearings were held during August and September 2015. Most of the oral and written comments received concerned: the duties of a Safety Watch, the exception to the two-worker rule, and helicopters. Changes to the final rule include: Safety Watch: Safety Watch text was added to the final rule [redacted phone](13). Operating switches: [redacted phone](2)(b)(B) was changed to clarify that [redacted phone](2)(b)(E) must be followed for routine switching of load break elbows. Helicopters: Paragraphs were removed which were already addressed by, or were in conflict with, other regulatory agencies; or were unnecessarily restrictive based upon accepted industry practices. On October 5, 2015 Federal OSHA published in the Federal Register, minor language clarifications in rules related to Line Clearance Tree Trimming as well as correcting errors in Table R-6 (Alternative Minimum Approach Distances.) The note for enclosed spaces was removed from Appendix A-3 and placed in Appendix A-5. These corrections have been incorporated in Oregon OSHA's final rules. This is Oregon OSHA Administrative Order 3-2015, adopted October 9, 2015, and effective January 1, 2016. Note: Oregon-initiated rules appear in italics in this codebook in proximity to related federal rules. Note: Oregon OSHA adopted these permanent rules to prevent heat illness when employees are exposed to high ambient temperatures. Without specific rule requirements, Oregon OSHA recognized that both employers and workers may not clearly understand expectations of what must be done to prevent work-related heat illness. The deadly heat wave of June 2021, which contributed to multiple workplace hospitalizations and fatalities, underscored the need for such rules to protect workers against the serious risk …

[4] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 994

Open source document

Source excerpt

Oregon Occupational Safety and Health Division Oregon Administrative Rules AO 1-2025 Division 2 - (b) The employer's procedures for complying with the requirements of this standard, including, but not limited to, the employer's responsibility to provide water, heat index information (including the risks to experiencing a heat-related illness), shade, preventative rest breaks, and access to first aid, as well as how employees can exercise their rights under this standard without fear of retaliation; - (c) The importance of frequent consumption of small quantities of water, up to 32 ounces per hour, when the work environment is hot and employees are likely to be sweating more than usual in the performance of their duties; - (d) The concept, importance, and methods of the acclimatization plan pursuant to the employer's procedures under section (8); - (e) The different types of heat illness, the common signs and symptoms of heat illness, and the appropriate first aid and emergency response to the different types of heat illness, including how heat illness may progress quickly from mild signs and symptoms to a serious and life-threatening condition; - (f) The importance for employees to immediately report to the employer, directly or through the employee's supervisor, signs and symptoms of heat illness in themselves or in others; and - (g) The effects of nonoccupational factors (drugs, alcohol, obesity, etc.) on tolerance to occupational heat stress. - (10) Training documentation. Verify compliance with section (9) by preparing and maintaining written or electronic training records that can be provided to Oregon OSHA upon request. Such records must contain the name or identification of each employee trained, the date(s) of the training, and the name of the person who conducted the training. The most recent annual training record for each affected employee must be maintained. Statutory/Other Authority: ORS 654.025(2), 654.035 & 656.726(4) Statutes Implemented: O…

[5] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 987

Open source document

Source excerpt

J Division 2 AO 1-2025 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (C) Employees who work from home are subject only to the training requirements in sections (9) and (10). - (2) Definitions. - (a) Acclimatization - Temporary adaptation of the body to work in the heat that occurs gradually when a person is exposed to it. Acclimatization peaks in most people within seven to fourteen days of regular work for at least two hours per day in the heat. This time frame applies to fit individuals with no underlying medical conditions. - (b) Drinking water - Potable water that is suitable to drink and that is cool (66 °F -77 °F) or cold (35 °F -65 °F). - (c) Heat Illnesses - Medical conditions resulting from the body's inability to cope with a particular heat load, and includes heat cramps, heat exhaustion, heat syncope, and heat stroke. - (d) Shade - Blockage of direct sunlight is shade. One indicator that blockage is sufficient is when objects do not cast a shadow in the area of blocked sunlight. Shade is not sufficient when heat in the area of shade defeats the purpose of shade, which is to allow the body to cool. For example, a car sitting in the sun does not provide acceptable shade to a person inside it, unless the car is running with working air conditioning. Shade may be provided by any natural or artificial means that does not expose employees to unsafe or unhealthy conditions, and that does not deter or discourage access or use. - (e) Temperature-controlled environment -an indoor setting where the temperature is maintained with a mechanical cooling system. - (3) Access to shade. Establish and maintain one or more shade areas that are immediately and readily available to exposed employees that are outdoors when the heat index in the work area equals or exceeds 80 degrees Fahrenheit. The shade areas must meet the following criteria: - (a) The shade area must either be open to the outside air (at least three open sides) or provide m…

[6] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 996

Open source document

Source excerpt

Oregon Occupational Safety and Health Division Oregon Administrative Rules AO 1-2025 Division 2 ## Appendix A to [redacted phone] - Mandatory Information for Heat Illness Prevention To protect the health and safety of employees from heat-related illnesses, employers should consider using the resources in this appendix. Please note that some resources may use temperatures in Celsius instead of Fahrenheit. To convert to degrees Fahrenheit, use this formula: Fahrenheit (°F) = (Celsius x 1.8) + 32 - 1. Most heat-related illnesses affect workers who do strenuous physical activity. When workers engage in intense work, their bodies create heat. This "metabolic" heat combines with environmental heat (from temperature, sunlight, humidity, etc.) so workers' core temperature can rise to dangerous levels. To prevent a hazardous combination of environmental and metabolic heat, employers should be aware of workers' activity level. Workload can be classified as rest, light, moderate, heavy, or very heavy. - · Light: Sitting or standing with minimal arm and leg work. - · Moderate: Continuous modest intensity, such as light pushing/pulling or normal walking. - · Heavy: Intense upper body work such as carrying loads or sawing. - · Very heavy: Intense activity at an almost maximum pace.

[7] Rules for the Administration of the Oregon Safe Employment Act (General Occupational Safety and Health, Division 2, OSHA Oregon)

Page 993

Open source document

Source excerpt

J Division 2 AO 1-2025 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (8) Heat illness prevention plan. Develop, implement, and maintain an effective heat illness prevention plan in writing. The plan must be made available at the worksite to employees and to Oregon OSHA upon request. The plan must contain at least the following information: - (a) How employees will be trained on the hazards of heat exposure and the necessary steps to prevent heat-related illnesses; - (b) How to recognize the symptoms of dehydration, and how to respond to suspected heat-related illnesses in others; - (c) How sufficient amounts of cool, potable water in work areas will be provided; - (d) How employees will be provided frequent opportunities and encouragement to stay hydrated by drinking water; - (e) How employees will be provided sufficient space to rest in a shaded area or cool climate-controlled area, and where heat-affected employees may cool off and recover when signs and symptoms of heat-related illnesses are recognized; - (f) How the employer will implement the heat illness prevention rest break schedule when necessary to keep employees safe; and - (g) How the employer will implement heat acclimatization procedures for new employees or employees returning to work from extended absences of seven or more days. - (9) Supervisor and employee training. Provide heat illness prevention training to all employees, including new employees, supervisory and non-supervisory employees in a language and vocabulary readily understood, and in a manner that facilitates employee feedback. Such training must be provided annually before employees begin work that should reasonably be anticipated to expose them to the risk of heat illness, and include at least the following: - (a) The environmental and personal risk factors (for example, chronic obstructive pulmonary disease, asthma, kidney disease, obesity, etc.) for heat illness that may limit an individual's toler…

[8] General Regulation (N.B. Reg. 91-191)

Page 42

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Source excerpt

## Extremes of temperature 23 (1) Where an employee is exposed to work condi -tions that may present a hazard because of excessive heat, an employer shall ensure that a competent person instructs the employee in the significance of symptoms of heat stress such as heat exhaustion, dehydration, heat cramps, prickly heat and heat stroke and in the precau -tions to be taken to avoid injury from heat stress. 23 (2) Where an employee is exposed to work condi -tions that may present a hazard because of excessive cold, an employer shall ensure that a competent person instructs the employee in the significance of symptoms of cold stress such as severe shivering, pain in the ex -tremities of the body and reduced mental awareness and in the precautions to be taken to avoid injury from cold stress. ## Threshold Limit Values for Formaldehyde and Lead Sulfide Repealed: 2022-27 2001-33; 2022-27 ## Threshold limit value for formaldehyde Repealed: 2022-27 2022-27 23.1 Repealed: 2022-27 2001-33; 2022-27 ## Air Contaminants and Industrial Ventilation 2022-27; 2022-79 ## Air contaminants - level of concentration 2022-79 24 (1) An employer shall ensure that an air contami -nant is kept at a level of concentration that does not con -stitute a hazard to the health or safety of an employee ex -posed to it and, if an occupational exposure limit exists in respect of an air contaminant, that the exposure of the employee to the air contaminant at no time exceeds the occupational exposure limit. Chemical Substances and Physical Agents and Biolo -gical Exposure Indices ». 2001-33; 2022-27 ## Températures extrêmes 23 (1) Lorsque les conditions de travail d'un salarié peuvent l'exposer au danger de chaleur excessive, l'em -ployeur doit s'assurer que le salarié reçoit les instruc -tions d'une personne compétente sur la signification des symptômes de stress dû à la chaleur tels que l'épuise -ment dû à …

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