What NO₂ means
NO₂ is a pollutant strongly linked to traffic. It is used here as the main indicator because it can change quickly by hour and by area across Madrid.
MADRIDAire
Interpretation guide
Guide to interpreting air quality in Madrid
Start here if you want to understand what is happening now, where to look in Madrid, and how to go deeper only when you need it. The technical layer is still available, but it no longer competes with the public reading.
Stations you can inspect
28
Locations with recent readings
Visible pollutants
12
NO₂ · O₃ · PM10 · PM2.5
Latest update
28 Sept 2026, 02:00
over 12h old
Highest reading now
Collado Villalba
NO₂ · 27 µg/m³
Start here
These routes are meant for anyone: see current conditions, place them on the map, compare stations, and check the short-term NO₂ forecast.
Start here
Air quality overview
The fastest way to see which location has the highest reading and when the network last updated.
Best when you want a quick answer.
Open this view
Get your bearings
Air quality map
See which stations are near you and visually compare how the air changes across areas.
Best when you want the geographic picture.
Open this view
Compare
Monitoring stations
Open a specific station to see location, latest reading, and recent history without technical jargon.
Collado Villalba is currently the highest point.
Open this view
Plan ahead
NO₂ forecast
Check an indicative outlook for the next few hours and compare it with the latest reading.
Best when planning trips or outdoor time.
Open this view
How to read what you see
These three ideas are enough to read the site without prior knowledge: what the main indicator means, what the update time tells you, and how to use the forecast without overreading it.
What the latest update means
It tells you when the last official reading arrived. If many hours have passed, the view is still useful as context, but it no longer describes the exact current moment.
What a 24h forecast means
It is a guide to anticipate changes through the day. It helps with planning, but it does not replace official alerts or health advice.
If you want to decide quickly
You do not need to browse the whole site. Pick a route based on your immediate need and only go to the technical detail if you truly need it.
If you only want to know how the air looks right now
Start with the Overview. In a few seconds you will see the highest reading, the update time, and the overall network status.
If you want to inspect your area or municipality
Go to the map if you prefer a spatial view, and to Stations if you want to compare places, surroundings, and a specific station card.
If you want to plan the next few hours
Open Forecast. There you can see how NO₂ might change and whether the trend is rising, falling, or holding steady.
If you want more detail
This is where methodology, model metrics, reports, and operational status live. Open it only when you want to go deeper.
Open technical detail
If you want more detail
This is where methodology, model metrics, reports, and operational status live. Open it only when you want to go deeper.
Technical details
Model v1 and metrics
A page to review model accuracy and understand what its metrics mean.
Accuracy and forecast limits.
Open details
Technical details
Methodology and traceability
A step-by-step explanation of sources, data preparation, and the limits of the methodology.
Latest signal used: 28 Sept 2026, 02:00
Open details
Technical details
Reports and context
Editorial summaries that add context to the state of the system and the model.
Interpretation and additional context.
Open details
Technical details
System operational status
Operational project status: data updates, alerts, and maintenance signals.
Updates, alerts, and maintenance.
Open details