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ActSmall · Air

Air-Quality Map

Tap any monitor — see readings against the 2021 guideline, and the single best thing you can do for that air tonight. Stations from ; country shading from population-weighted via Our World in Data. Refreshed once a day. Each monitor value is a point-in-time reading; the 24-hour guideline applies to 24-hour averages.

Opens on a top-3 worst- monitor on the live feed. Search or the worst-list to explore your own region.

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Country averages — population-weighted annual from Our World in Data.

Act now — what you can do

Curated, link-out-only. Pick a monitor on the map to see actions tailored to its situation; or tonight’s default is the same everywhere: the $30 Corsi-Rosenthal filter.

    Today’s worst monitors

    Top monitors on the active pollutant from the latest pull. Click a row to fly there and see interventions.

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        Browse the open intervention catalogue (12 items)

        Each intervention is household- or community-scale and pairs with at least one freely accessible reference (, , , peer-reviewed evaluations). Click any card for details.

        How this portal works
        • Monitor readings are pulled from — an open archive of measurements from 100+ governmental and research networks. We pull the latest , NO₂, and O₃ values once a day.
        • 2021 thresholds anchor the station colours: a 24-hour mean over 15 µg/m³ is above the guideline; readings over 75 are labelled “hazardous”. Only the 15 µg/m³ line is a value — the upper “unhealthy/hazardous” bands are an AQI-style scale, not categories. Station values are point-in-time readings, while the guideline applies to 24-hour averages. NO₂ and O₃ have their own thresholds.
        • Country shading uses population-weighted annual averages from Our World in Data, shaded with the same approximate bands (these are not the annual guideline, which is 5 µg/m³) — a fallback when no station is right next to you.
        • The recommender derives need-signals (pollutant level, indoor vs outdoor source, climate band) and ranks the catalog by use-case match plus simplicity.
        • Your pins live in your browser’s local storage. Use Export JSON to back them up or share with someone you trust.
        • No accounts. No tracking. No upload. Outbound calls from the browser: our own server (live data), OpenFreeMap (basemap).

        Sources: country borders — Natural Earth (public domain); basemap — OpenFreeMap & OpenStreetMap contributors (ODbL); air-quality monitors — (CC BY 4.0), refreshed daily; country averages — Our World in Data (CC BY 4.0); thresholds — Global Air Quality Guidelines (2021); rendering — MapLibre GL JS (BSD-3); intervention catalogue assembled from open-access references including US IAQ, , Clean Air Crew, CDC .

        Station coverage is uneven: most of Europe, North America and East Asia is dense; sub-Saharan Africa and parts of Central Asia are thinly covered. Where there is no station, country shading is the best signal we have. See methodology.