Environment Canada has issued a heat warning for Toronto and most of the province, and this is expected to last throughout the week. This heat wave, and the potential for a hot and humid summer, is a great opportunity to review some of the hazards associated with working outdoors and how to stay safe.

Heat stress is a concern for anybody who is exposed to hot and humid environments. When exposed to extreme temperatures, excess stress is placed on the body’s ability to cool itself. Heat stress can lead to a variety of illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stress is a particular concern when physical work is being performed, if there is not enough fluid in the body, or if there is a pre-existing medical condition.

Consider the following precautions and tips to stay safe when working or spending time outdoors this week and throughout the summer:

• Minimize prolonged exposure to the sun, and avoid strenuous activities, particularly during mid-day hours (10 a.m. to 4 p.m.). Take regular rest breaks.
• Keep cool: find shade or air-conditioned spaces, where possible.
• Consider wearing lightweight, breathable, and long-sleeved shirts and pants.
• Wear a hat and sunglasses, when possible.
• Drink lots of water to stay hydrated.
• Apply and reapply sunscreen with a Sun Protection Factor (SPF) of at least 30.
• Know the signs and symptoms of heat stress in yourself and those around you. These symptoms include excessive sweating, headaches, dizziness, cramping, and fainting. Notify a supervisor before these signs and symptoms occur.
• If you manage workers who work outdoors, monitor outdoor temperatures and determine appropriate measures to keep your workers safe.