- Tree cover
- 46.1%
- Air quality
- 34Good
- Trees in this area
- 139K
- More trees needed
- 0
- Area analysed
- 12.1 km²land, in a 12.57 km² circle
- Satellite image
- Sep 11, 2026
Joliet's tree count comes to 139,469 trees across 12.1 km² of land — already at or above the 30% tree-cover level considered healthy for this area. Air quality currently reads AQI 34 (Good): Air quality is satisfactory for everyone.
Tree cover detail
Healthy tree cover
46.1% tree cover against a 30% healthy-neighbourhood target, across 12.1 km² of land.
Trees in this area
139,469
Target trees
139,469
More trees needed
0
CO₂ if planted / yr
0 kg
Air quality detail
AQI 34Good
Observed Sep 21, 22:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.4
PM10
6.6
NO₂
13.3
O₃
55.0
SO₂
2.6
CO
151.0
Frequently asked
Questions about Joliet
What is the tree count in Joliet?
Joliet has an estimated 139,469 trees across the 12.1 km² of land measured — 46.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Joliet need?
Joliet has already reached its tree-cover target, so no additional trees are needed to close the gap.
What is the air quality (AQI) in Joliet right now?
The latest reading for Joliet shows an AQI of 34 (Good), observed Sep 21, 22:00 local time via Open-Meteo / CAMS. Air quality is satisfactory for everyone.
How is Joliet'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 Joliet; the tree count is an estimate derived from that cover. Air-quality readings come from Open-Meteo / CAMS and may differ from street-level monitors.
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