Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Haze weather occurs when fine particles such as smoke, dust, or industrial pollutants scatter sunlight, reducing visibility and giving the sky a milky or grey appearance. In Canada it is most common during summer wildfire season, though winter temperature inversions can also trap haze near the ground. The live forecast above shows current haze conditions for your community today.
What causes haze weather?
Haze typically results from microscopic particles suspended in the air. In Canada, the primary sources are wildfire smoke during summer, agricultural burning in prairie regions, and urban pollution combined with stagnant air masses. Winter haze often stems from wood-burning stoves and vehicle emissions trapped under a temperature inversion.
Is haze weather dangerous?
For most people, haze is an inconvenience rather than a hazard. However, fine particulate matter (PM2.5) in thick haze can irritate the lungs and worsen conditions like asthma or heart disease. Environment and Climate Change Canada issues air-quality statements when haze levels climb, especially during active wildfire events.
What is haze weather in winter?
Winter haze in Canada is usually caused by temperature inversions that trap cold air near the ground, holding moisture and pollutants close to the surface. It can combine with freezing fog, creating a persistent grey veil that reduces visibility and leaves a fine icy film on surfaces.
How does haze differ from fog?
Fog is composed of tiny water droplets that form when air cools to its dew point, cutting visibility below 1 km. Haze is made of dry particles that scatter light—smoke, dust, or chemicals—and does not feel damp. Fog typically clears with sunshine, whereas haze may linger for days.
What is the haze weather symbol in Canada?
Environment and Climate Change Canada uses a standard meteorological symbol for haze: three horizontal lines stacked above a cloud shape. On your local forecast page, this icon appears alongside visibility notes and any air-quality alerts for your area.
Sources
Stay informed with the Canada weather hub for your region, and check weather warnings if haze reduces visibility or air quality deteriorates. For local forecasts, see Toronto Weather, Calgary Weather, or Vancouver Weather.