Toronto air quality exceeded the WHO annual limits on nearly a quarter of days from 2020 to 2021. Due to wildfire smoke from wildfires out west, Toronto air quality averaged nearly six times the daily recommended limit of dangerous PM2.5 pollutants on its worse day in 2021.
Current Air Quality in Toronto
22% Of Days in Toronto More Polluted Than WHO Target
Toronto’s daily air quality levels exceeded the World Health Organization (WHO) annual limit on 22% of days in 2020-2021. The PM2.5 AQI reached over 150 in many areas of the city in July of 2021 due to wildfire smoke.
Historical Air Quality Readings for Toronto
Is Toronto Air Quality Improving?
In the last three years, data shows little improvement in Toronto air quality. Although 2020 saw a slight improvement from 2019, 2021 levels are currently higher than the previous two years. Toronto’s annual level of air pollution consistently hovers just under the WHO recommended limit.
Why Is the Air Quality Bad Today in Toronto?
Weather plays a big role in how the air quality is in Toronto each day. The amount of sun can affect how much ozone there is, and wind and rain can affect PM2.5 and particulate air pollution to varying degrees.
Air pollution levels can change quickly, with levels often varying widely throughout the day. Data shows there even appears to be times of the day where air pollution tends to be lower compared to other times.
Below shows how PM2.5 air quality levels around the world tend to vary throughout the day. PM2.5 levels have a tendency to be slightly lower in the afternoon compared to other times of the day. But this is a general trend, Toronto PM2.5 AQI levels will not follow this trend every day.
How Wildfires Out West Affect Toronto’s Air Quality Levels
Outside of weather, wildfires are another factor that can significantly affect Toronto’s air quality. The worst wildfires typically occur in the months of June to September. In July of 2021, wildfire smoke from California and Oregon reached Toronto, and Toronto air quality reached its worse levels in years.
Read More: How Wildfires in California Affect Air Pollution Levels
Below shows how wildfires in September of 2020 affected air quality levels all across the west coast.
Toronto Air Pollution: The Negative Health Effects
This analysis of Toronto’s air quality is based on PM2.5 pollution. These are particles smaller than 2.5 microns in diameter that can penetrate deep into the lungs and even enter the bloodstream.
Studies have shown that PM2.5 raises blood pressure, inflammation, and rates of heart attacks and strokes.
WATCH: Why Is PM2.5 So Harmful to Us?
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Protect Your Health in Toronto From Air Pollution and Wildfire Smoke
Despite the harms of PM2.5 that is in wildfire smoke and air pollution, placebo-controlled studies of air purifiers have found that removing particulate in the home has positive effects on blood pressure, inflammation, and immune response.
Smart Air provides the world’s most cost-effective, data-backed air purifiers to help air-breathers protect themselves and their family. Smart Air is a certified B Corp founded to publicize the simple science behind air purifiers and masks, thereby lowering the cost of breathing clean air.
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