A series of heat waves have swept through various parts of the country in the middle of July. On Tuesday, several regions in northern and southern Ontario, Quebec, and even the Northwest Territories were placed under a heat alert. Downtown Toronto experienced scorching temperatures reaching 36 C, making it the hottest spot in the country based on early data from Environment and Climate Change Canada. The heat is expected to persist until Thursday.
The issue of accurately counting heat-related deaths in Canada remains a challenge. Due to the absence of a federal coroner’s organization and a standardized reporting system for such fatalities nationwide, discrepancies arise in how heat-related deaths are recorded across different provinces and territories. This lack of uniformity in data collection poses a significant problem, leading to uncertainty in determining the actual number of heat-related fatalities.
The complexity of attributing deaths to heat-related causes is exemplified by scenarios where individuals with pre-existing health conditions, like heart disease, pass away in high-temperature environments. The interpretation of such incidents varies among coroners in different regions, further complicating the tracking of heat-related mortality.
Climate scientist Andrew Dessler highlights the diverse methods used to quantify heat-related deaths in the media, ranging from official death certificate figures reported by medical examiners to academics calculating excess deaths through regression techniques. The discrepancies in these numbers can confuse the public seeking to comprehend the impacts of extreme temperatures.
As global warming intensifies, the frequency and duration of heat waves are projected to rise in Canada due to climate change. The continued reliance on fossil fuels contributes to planetary warming, exacerbating hazardous weather conditions.
Efforts to address heat-related deaths are outlined in the federal government’s National Adaptation Strategy, which aims to eliminate fatalities resulting from extreme heat waves by 2040. However, achieving this goal hinges on obtaining accurate data regarding heat-related mortality, a challenge identified by a 2025 Health Canada study on the subject.
Following the devastating 2021 heatwave in British Columbia, significant changes were implemented to enhance heat-related death reporting and prevention measures in the province. The tragic events of that year underscored the importance of accurate reporting in prompting policy responses and safeguarding vulnerable populations from heat-related illnesses and deaths.
The global scale of the heat-related death crisis is evident in recent European heat waves, where thousands of excess fatalities were recorded. Experts emphasize the necessity of standardized measurement practices worldwide to effectively address the growing threat of heat-related illnesses and deaths amid escalating climate change impacts.