Map
Basemap only. Boundary and data layers load from the backend.
Anomaly layer: waiting for the first analysis.
About this layer
Colors show the selected day's Sentinel-5P tropospheric NO₂ column anomaly. At each pixel, the anomaly is the selected day's value minus the median of valid daily observations from the same calendar month over the previous three years. The layer is smoothed for display and does not represent ground-level concentration or AQI.
Readouts
Regional mean column
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Signed anomaly
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Percentile in history
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Valid-area coverage
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Observation detail
- Selected local date
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- Observation status
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- Source assets (footprint)
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- Distinct products
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- Distinct orbits
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- Product quality
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- Projection compatibility
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- Baseline status
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- Historical median
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- Historical sample count
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- Requested prior years
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- Contributing prior years
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Footprint intersection is not contribution: a source asset can intersect the region without supplying any valid pixel. Baseline figures are a rolling comparison against recent same-month history, not a homogeneous long-term trend.
What this prototype does not yet assess
This prototype does not classify air-quality episodes or evaluate persistence, ground-monitor measurements, or meteorological conditions.