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First Images from Sentinel-4 Reveal Europe's Air Quality Hotspots

10/22/2025

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Summary

Story summary

The Copernicus Sentinel-4 mission has released its first images, highlighting atmospheric concentrations of nitrogen dioxide, sulphur dioxide, and ozone.
These images mark a significant improvement in Europe’s air quality monitoring from a geostationary orbit, 36,000 kilometers above Earth.
The images reveal a sulphur dioxide plume from Mount Etna and nitrogen dioxide pollution hotspots along the Mediterranean coast and Italy’s Po Valley.
The mission cannot measure nitrogen dioxide over cloud-covered areas, despite the pollutants posing serious health and environmental risks.

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Story summary

The Copernicus Sentinel-4 mission has released its first images, highlighting atmospheric concentrations of nitrogen dioxide, sulphur dioxide, and ozone.
These images mark a significant improvement in Europe’s air quality monitoring from a geostationary orbit, 36,000 kilometers above Earth.
The images reveal a sulphur dioxide plume from Mount Etna and nitrogen dioxide pollution hotspots along the Mediterranean coast and Italy’s Po Valley.
The mission cannot measure nitrogen dioxide over cloud-covered areas, despite the pollutants posing serious health and environmental risks.