Toronto Environmental Health Dashboard
30 indicators. One city. Tracked block by block.
The same four elements, zoomed in to the Greater Toronto Area: the ravines, the waterfront, the highways, and the neighbourhoods where these issues are felt first and most unevenly. Click any tile for the full picture.
30Toronto/GTA indicators tracked
0Rated Critical
26Trending worse
6Categories covered
How we score severity
A transparent, repeatable 0–100 scale.
Severity:Critical ≥75Serious 50–74Moderate 25–49Watch <25
AtmosphereSerious
Traffic-related air pollution
Neighbourhoods near the 401, Gardiner, and DVP see elevated fine particulate levels
Severity 66/100▲ Worsening
AtmosphereSerious
Downtown urban heat island
Downtown Toronto can run several degrees hotter overnight than surrounding suburbs
Severity 69/100▲ Worsening
AtmosphereSerious
Building emissions (Toronto's largest GHG source)
Buildings account for more than half of Toronto's greenhouse gas emissions
Severity 58/100▲ Worsening
AtmosphereSerious
Wildfire smoke advisories
Toronto issued multiple air quality alerts in recent summers tied to wildfire smoke from northern Ontario and Quebec
Severity 64/100▲ Worsening
AtmosphereSerious
Urban tree canopy gap
Toronto's tree canopy sits below its own 40% coverage target in many wards
Severity 52/100▲ Worsening
Waterfront & WaterwaysSerious
Toronto beach water quality advisories
Several Toronto beaches issue E. coli-related swim advisories most summers
Severity 55/100▲ Worsening
Waterfront & WaterwaysSerious
Combined sewer overflows into Lake Ontario
Heavy rain events still trigger untreated sewer overflows into the Don River and Lake Ontario
Severity 61/100▲ Worsening
Waterfront & WaterwaysSerious
Don River water quality
The Don River remains one of the most degraded urban rivers in Canada despite decades of restoration work
Severity 59/100▲ Worsening
Waterfront & WaterwaysSerious
Humber River erosion and water quality
Erosion along Humber River banks has accelerated with more frequent high-intensity storms
Severity 54/100▲ Worsening
Waterfront & WaterwaysSerious
Waterfront microplastics and litter
Microplastic concentrations along Toronto's Lake Ontario shoreline are among the higher readings recorded in the Great Lakes
Severity 50/100▲ Worsening
LandSerious
Ravine system erosion and encroachment
Toronto's ravine system faces ongoing erosion and encroachment pressure despite protective policy
Severity 57/100▲ Worsening
LandSerious
Green space access gap
Park space per resident varies sharply between downtown and inner-suburban wards
Severity 53/100▲ Worsening
LandSerious
Emerald ash borer impact on the urban forest
The large majority of Toronto's ash trees have been killed or removed since the pest's arrival
Severity 55/100▲ Worsening
LandModerate
Brownfield and contaminated site redevelopment
Hundreds of known contaminated sites across Toronto remain at various stages of remediation
Severity 45/100● Stable
LandSerious
Winter road salt impact on soil and ravines
Chloride accumulation in soil near major roads and ravines continues to rise
Severity 51/100▲ Worsening
BiodiversitySerious
Bird-building collision deaths
Toronto is estimated among the deadliest cities in North America for migratory bird-building collisions
Severity 68/100▲ Worsening
BiodiversitySerious
Invasive species in ravines
Dog-strangling vine and garlic mustard have established across much of Toronto's ravine system
Severity 56/100▲ Worsening
BiodiversityModerate
Urban pollinator habitat loss
Native pollinator habitat continues to shrink as vacant and green lots are developed
Severity 49/100▲ Worsening
BiodiversitySerious
Monarch butterfly stopover habitat decline
Milkweed and nectar habitat along the Lake Ontario shoreline continues to decline
Severity 52/100▲ Worsening
BiodiversityModerate
Toronto Islands ecosystem pressure
Rising Lake Ontario water levels and high visitor traffic continue to stress Toronto Island habitats
Severity 47/100● Stable
Human HealthSerious
Heat-related illness in high-rise apartments
Toronto has no bylaw requiring air conditioning in rental units, and heat deaths concentrate in older high-rises
Severity 67/100▲ Worsening
Human HealthSerious
Traffic pollution and childhood asthma
Asthma hospitalization rates are notably higher in Toronto neighbourhoods near major highways
Severity 62/100▲ Worsening
Human HealthSerious
Basement flooding claims
Major storm events in recent years have triggered tens of thousands of flood-related insurance claims in a single day
Severity 63/100▲ Worsening
Human HealthSerious
Unequal cooling access across neighbourhoods
Air conditioning access varies sharply by income across Toronto wards
Severity 58/100▲ Worsening
Human HealthModerate
West Nile virus and mosquito season length
Toronto's mosquito season has lengthened as average temperatures rise
Severity 46/100▲ Worsening
ResourcesSerious
Waste diversion rate below target
Toronto's residential waste diversion rate remains below the city's own 70% target
Severity 54/100● Stable
ResourcesSerious
Aging stormwater and sewer infrastructure
Large portions of Toronto's sewer system predate modern stormwater management standards
Severity 60/100▲ Worsening
ResourcesModerate
TTC and transit fleet electrification pace
The TTC's bus fleet electrification is progressing more slowly than its original target timeline
Severity 48/100▼ Improving
ResourcesSerious
Building retrofit pace vs net-zero target
Deep energy retrofit rates remain well below what's needed to meet Toronto's 2040 net-zero target
Severity 56/100▲ Worsening
ResourcesModerate
Electricity demand growth vs local grid capacity
Rising demand from electrification and new development is straining parts of Toronto's local grid capacity
Severity 45/100▲ Worsening