Heat Stress Awareness: Stay Safe in Hot Conditions
As temperatures rise, so does the risk of heat stress, a condition that occurs when the body cannot cool itself effectively. Heat stress can affect anyone working, studying, or spending extended periods outdoors or in hot indoor environments.
Know the Signs
Watch for early symptoms of heat-related illness, including:
- Excessive sweating
- Dizziness or headache
- Muscle cramps
- Fatigue or weakness
- Nausea
- Difficulty concentrating
More serious symptoms such as confusion, loss of consciousness, seizures, or a very high body temperature may indicate heat stroke, a medical emergency requiring immediate assistance.
Protect Yourself
- Drink water regularly throughout the day
- Don’t keep food at room temperature for more than one hour
- Take breaks in cool or shaded areas
- Wear light, breathable clothing whenever possible
- Use the buddy system and watch for signs of heat illness in others. Click here for more information about Working Alone.
- Report symptoms to your supervisor early and seek medical attention when needed
Heat Warnings
When temperatures and humidity rise to dangerous levels, Heat Warnings may be issued to help residents prepare and stay safe.
What is a Heat Warning?
Environment and Climate Change Canada (ECCC) issues Heat Warnings when weather conditions are expected to pose a risk to health due to extreme heat and humidity. Heat Warnings:
- Use a colour-coded system (Yellow, Orange, and Red) to indicate the severity of heat conditions
- Provide advance notice so individuals can adjust outdoor activities and make safety plans
- Alert people who may be more vulnerable to heat-related illness and those who care for them
- Share practical tips to help residents stay safe and healthy during periods of extreme heat
When is a Heat Warning Issued?
A Heat Warning may be issued when one of the following conditions is expected for two or more consecutive days:
- Daytime temperatures reach 31°C or higher and nighttime temperatures remain at 20°C or higher.
OR
- The humidex reaches 40°C or higher.
Be In the Know
Sign up for email alerts to receive notifications when Heat Warnings are issued through Lakelands Public Health’s Email Alert System, the City of Oshawa’s Email Alert System, or check your local public health unit or municipality’s website for available heat alert notification services.
Read more on Heat Stress and Working in Hot Conditions, including Trent's Heat Stress Plan.