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Airleaf
Aerial study of a dense urban district organized around a green corridor
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City report · Switzerland

Winterthur

Measured across a 2 km radius around Winterthur, Switzerland (12.57 km²)

Tree cover
70.7%
Air quality
34Good
Trees in this area
222K
More trees needed
0
Area analyzed
12.57 km²
Satellite image
Sep 25, 2026
Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 25, 2026

Winterthur's tree count comes to 222,111 trees across 12.57 km² — 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

70.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².

Target reached

Trees in this area

222,111

Target trees

222,111

More trees needed

0

CO₂ if planted / yr

0 kg

Air quality detail

AQI 34Good

Observed Sep 28, 04:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.

Ground station · Technikum/Turmhaldenstrasse, 900 m away · median of 6 stations

Health signal

Air quality is satisfactory for everyone.

PM2.5

8.1

PM10

7.2

NO₂

9.2

O₃

50.3

SO₂

—

CO

—

Data: OpenAQ · AirGradient, EEA, Simon

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Winterthur tree cover and air quality — measured by Airleaf
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Frequently asked

Questions about Winterthur

What is the tree count in Winterthur?

Winterthur has an estimated 222,111 trees across the 12.57 km² measured — 70.7% tree cover, already past the 30% tree-cover target set for this area.

How many more trees does Winterthur need?

Winterthur has already reached its tree-cover target, so no additional trees are needed to close the gap.

What is the air quality (AQI) in Winterthur right now?

The latest reading for Winterthur shows an AQI of 34 (Good), measured Sep 28, 04:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Technikum/Turmhaldenstrasse, 900 m away). Air quality is satisfactory for everyone.

How is Winterthur'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 Winterthur; the tree count is an estimate derived from that cover. Air quality is measured by ground monitoring stations near Winterthur, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate.

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Methodology. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search imagery at 10 m detail for the stated radius; the tree count is an estimate derived from that cover. Air quality is measured by ground monitoring stations near Winterthur, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate.