Air quality comparison · Canada, 3539 km apart
Ottawa vs Vancouver Air quality index (AQI) today
Ottawa has cleaner air than Vancouver right now: AQI 17 (Good) against 26 (Good).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 7 days, on modeled daily averages, Ottawa averaged AQI 26 against 47, and it was the cleaner of the two on 6 of those days. Ottawa has lost more forest since 2001. Vancouver has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Ottawa17Vancouver26
Head to head
Ottawa vs Vancouver at a glance
Ottawa and Vancouver are level, each ahead on 3 of 6 measures. The better figure in each row is marked.
| Ottawa | Vancouver | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 17 (better) | 26 |
| PM2.5Fine particles, µg/m³. | 1.4 (better) | 3.4 |
| Past week's averageUS AQI, 7 days. | 26 (better) | 47 |
| Forest lost since 2001Within 10 km of the center. | 302 ha | 272 ha (better) |
| Tree coverWithin 2 km of the center. | 22.4% | 23.8% (better) |
| Trees still neededTo reach a healthy canopy. | 22.2K | 12.8K (better) |
Air quality today
What is the air like in Ottawa and Vancouver right now?
Ottawa has cleaner air than Vancouver right now: AQI 17 (Good) against 26 (Good). Ozone is setting the index in both.
Both readings come from nearby ground stations.
OttawaVancouver
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, Ottawa averaged AQI 26 against 47, and it was the cleaner of the two on 6 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Ottawa6Vancouver1
- Average AQI
- Ottawa26Vancouver47
- Worst day, AQI
- Ottawa51Vancouver60
The daily numbers (7 days)
| Day | Ottawa | Vancouver |
|---|---|---|
| Nov 5 | 19 | 52 |
| Nov 6 | 28 | 40 |
| Nov 7 | 51 | 47 |
| Nov 8 | 34 | 44 |
| Nov 9 | 16 | 60 |
| Nov 10 | 34 | 44 |
| Nov 11 | 2 | 43 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Ottawa and Vancouver today?
Air quality is satisfactory for everyone. Both are in the same EPA band today (Good), so the advice is the same.
Exercise outdoors
A good day to be active outside.
Windows
Open them to air the house.
Masks
Not needed.
Air purifier
Not needed.
Against everywhere else
How do Ottawa and Vancouver compare with the rest of the world?
Right now Ottawa's air is cleaner than 92% of the 5,420 places Airleaf tracks, and Vancouver's is cleaner than 84%. Within Canada, that is 72% and 50% of its 59 measured places.
Cleaner air than…
- Ottawa
- Beats 92%
- Vancouver
- Beats 84%
More tree cover than…
- Ottawa
- Beats 52%
- Vancouver
- Beats 55%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Ottawa or Vancouver?
Ottawa has lost more: about 302 ha of forest within 10 km of its center from 2001 to 2025, against 272 ha around Vancouver. 257 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2022, with 44 ha lost.
Worst year: 2006, with 26 ha lost.
| Ottawa | Vancouver | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 302 ha | 272 ha (better) |
| Share of its forestOf what it had in 2000. | 4.1% | 3.7% (better) |
| Cleared for goodTurned into farms, mines or towns. | 257 ha | 249 ha (better) |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (85%) | Towns and roads (91%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Ottawa
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km west of the city center.
Vancouver
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Ottawa or Vancouver?
Vancouver has more tree cover: 23.8% of the land within 2 km of its center against 22.4% around Ottawa, or about 49,049 trees against 65,305.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Ottawa | Vancouver | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 65.3K (better) | 49.0K |
| Trees still neededTo reach the target. Fewer is better. | 22.2K | 12.8K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 1.4M kg (better) | 1.1M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Ottawa vs Vancouver: your questions answered
Is Ottawa cleaner than Vancouver?
On air quality, yes, right now: Ottawa reads AQI 17 against 26, a gap of 9 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. Over the past 7 days, on modeled daily averages, Ottawa averaged AQI 26 against 47, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Ottawa and Vancouver today?
The advice is the same for both today. Air quality is satisfactory for everyone. Ottawa reads AQI 17 and Vancouver reads AQI 26.
Which has lost more forest, Ottawa or Vancouver?
Ottawa has lost more: about 302 ha of forest within 10 km of its center from 2001 to 2025, against 272 ha around Vancouver. 257 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Ottawa or Vancouver?
Vancouver has more tree cover: 23.8% of the land within 2 km of its center against 22.4% around Ottawa, or about 49,049 trees against 65,305. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Ottawa and Vancouver need?
Ottawa needs about 22,157 more to reach its canopy target of 30%, and Vancouver about 12,777 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Ottawa and Vancouver measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Ottawa vs Vancouver comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Sep 11, 2026 and Sep 6, 2026), and the forest figures are published yearly.
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