City report · United States
Fremont
Measured across a 2 km radius around Sundale, Fremont, CA 94538, USA (12.57 km²)
- Tree cover
- 16.0%
- Air quality
- 52Moderate
- Trees in this area
- 50.1K
- More trees needed
- 43.8K
- Area analysed
- 12.52 km²land, in a 12.57 km² circle
- Satellite image
- Sep 12, 2026
Fremont's tree count comes to 50,064 trees across 12.52 km² of land — 14 points below the 30% tree-cover level considered healthy for this area, meaning roughly 43,806 more trees would close the gap. Air quality currently reads AQI 52 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Tree cover detail
Critically low
16.0% tree cover against a 30% healthy-neighbourhood target, across 12.52 km² of land.
Trees in this area
50,064
Target trees
93,870
More trees needed
43,806
CO₂ if planted / yr
963.7 t
Air quality detail
AQI 52Moderate
Observed Sep 21, 20:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
10.1
PM10
14.3
NO₂
9.4
O₃
64.0
SO₂
1.2
CO
128.0
Frequently asked
Questions about Fremont
What is the tree count in Fremont?
Fremont has an estimated 50,064 trees across the 12.52 km² of land measured — 16.0% tree cover, 14 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Fremont need?
Fremont needs roughly 43,806 more trees to close a 14-point shortfall against its 30% tree-cover target — about 963.7 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Fremont right now?
The latest reading for Fremont shows an AQI of 52 (Moderate), observed Sep 21, 20:00 local time via Open-Meteo / CAMS. Unusually sensitive people should consider limiting long outdoor exertion.
How is Fremont'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 Sundale; 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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