City report · United States
Simi Valley
Measured across a 2 km radius around Simi Valley, CA, USA (12.57 km²)
- Tree cover
- 13.1%
- Air quality
- 50Good
- Trees in this area
- 41.1K
- More trees needed
- 53.0K
- Area analysed
- 12.54 km²land, in a 12.57 km² circle
- Satellite image
- Sep 19, 2026
Simi Valley's tree count comes to 41,073 trees across 12.54 km² of land — 17 points below the 30% tree-cover level considered healthy for this area, meaning roughly 52,987 more trees would close the gap. Air quality currently reads AQI 50 (Good): Air quality is satisfactory for everyone.
Tree cover detail
Critically low
13.1% tree cover against a 30% healthy-neighbourhood target, across 12.54 km² of land.
Trees in this area
41,073
Target trees
94,060
More trees needed
52,987
CO₂ if planted / yr
1,166 t
Air quality detail
AQI 50Good
Observed Sep 21, 18:00 local time via Open-Meteo / CAMS. Values in µg/m³.
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.7
PM10
10.7
NO₂
1.4
O₃
101.0
SO₂
0.9
CO
129.0
Frequently asked
Questions about Simi Valley
What is the tree count in Simi Valley?
Simi Valley has an estimated 41,073 trees across the 12.54 km² of land measured — 13.1% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Simi Valley need?
Simi Valley needs roughly 52,987 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,166 t of extra CO₂ absorbed per year once grown.
What is the air quality (AQI) in Simi Valley right now?
The latest reading for Simi Valley shows an AQI of 50 (Good), observed Sep 21, 18:00 local time via Open-Meteo / CAMS. Air quality is satisfactory for everyone.
How is Simi Valley'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 Simi Valley; 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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