Province warns employers about work hazard of high temperatures

Many employees are suffering from scorching heat as the world enters an era of "global boiling," United Nations Secretary-General António Guterres previously warned. In fact, an additional 1°C of heat will limit the work hours of about 800 million people in the tropics, according to a previous report.

And it’s not just workers working outdoors that may be at risk from the heat, said Nauss.

“There are a lot of people who are working in warm conditions inside so when the temperatures climb there is a greater hazard there,” he said. “Employers and employees need to work together to come up with some measures to ensure their safety.

Heat-related illness occupational injury

Overlooking the risks that extreme heat brings to workers can be costly to companies.

Nauss noted that if an employee goes to a hospital due to heat-related illness, it is the employer’s responsibility to report the incident to the labour department’s occupational health and safety division, just like it is for any other workplace injury.

The department would then investigate the situation and try to determine if there was a violation of the Occupational Health and Safety Act or the regulations, Nauss said. 

“There is potential for enforcement action based upon the circumstance. Every situation is different,” he said.

In 2023, Ontario’s Ministry of Labour, Immigration, Training and Skills Development (MLITSD) proposed to introduce a stand-alone heat stress regulation under the Occupational Health and Safety Act (OHSA) with specific requirements that would apply to all workplaces to which the OHSA applies.

How to stay safe working in extreme heat

Some ways to keep workers safe from extreme heat – according to the Saltwire report – include:

• Giving workers frequent breaks
• Ensuring there is plenty of drinking water on site
• Rotating employees who are in the sun with employees in cooler areas
• Staggering work hours so they’re not at the hottest time of the day.

“Engineering controls are the most effective means of reducing excessive heat exposure,” noted the Canadian Centre for Occupational Health and Safety (CCOHS).

The examples that follow illustrate some engineering approaches to reducing heat exposure, according to CCOHS:

• Reducing metabolic heat production (heat produced by the body): Automation and mechanization of tasks minimize the need for heavy physical work and the resulting buildup of body heat.
• Reducing the radiant heat emission from hot surfaces: Covering hot surfaces with sheets of low emissivity material such as aluminum or paint that reduces the amount of heat radiated from this hot surface into the workplace.
• Insulating hot surfaces: Insulation reduces the heat exchange between the source of heat and the work environment.
• Shielding: Shields stop radiated heat from reaching workstations. Two types of shields can be used. Stainless steel, aluminum or other bright metal surfaces reflect heat back towards the source. Absorbent shields, such as water-cooled jackets made of black-surfaced aluminum, can effectively absorb and carry away heat.
• Ventilation and air conditioning: Ventilation, localized air conditioning, and cooled observation booths are commonly used to provide cool workstations. Cooled observation booths allow workers to cool down after brief periods of intense heat exposure while still allowing them to monitor equipment.
• Reducing the humidity: Air conditioning, dehumidification, and elimination of open hot water baths, drains, and leaky steam valves help reduce humidity.