City report · Canada · Ontario
Markham
Measured across a 2 km radius around Markham, ON, Canada (12.57 km²)
- Tree cover
- 62.5%
- Air quality
- 25Good
- Trees in this area
- 194K
- More trees needed
- 0
- Area analyzed
- 12.39 km²land, in a 12.57 km² circle
- Satellite image
- Sep 22, 2026
Markham's tree count comes to 193,601 trees across 12.39 km² of land — already at or above the 30% tree-cover level considered healthy for this area. Air quality currently reads AQI 25 (Good): Air quality is satisfactory for everyone.
Tree cover detail
Healthy tree cover
62.5% tree cover against a 30% healthy-neighborhood target, across 12.39 km² of land.
Trees in this area
193,601
Target trees
193,601
More trees needed
0
CO₂ if planted / yr
0 kg
Air quality detail
AQI 25Good
Observed Sep 27, 00:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.4
PM10
1.4
NO₂
4.5
O₃
53.0
SO₂
1.0
CO
137.0
Frequently asked
Questions about Markham
What is the tree count in Markham?
Markham has an estimated 193,601 trees across the 12.39 km² of land measured — 62.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Markham need?
Markham has already reached its tree-cover target, so no additional trees are needed to close the gap.
What is the air quality (AQI) in Markham right now?
The latest reading for Markham shows an AQI of 25 (Good), observed Sep 27, 00:00 local time via Open-Meteo / CAMS, US EPA index. Air quality is satisfactory for everyone.
How is Markham's tree cover and air quality measured?
Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Markham; the tree count is an estimate derived from that cover. Air-quality readings come from Open-Meteo / CAMS, US EPA index and may differ from street-level monitors.
See your own area
What does your neighborhood look like?
Pick any point and radius to get the same tree-cover and air-quality breakdown.
Check my address