Environment: live weather, air quality, UV and sun data

Weather and forecast data come from Open-Meteo, a free open source weather API. Air quality and UV data come from the Copernicus Atmosphere Monitoring Service (CAMS) through the Open-Meteo air quality API. Both are free, no API key required, and used by many public weather sites.

No. The coordinates are sent to Open-Meteo only to fetch the data, and only your browser does that. ToolDeck has no server in the loop. Saved locations are stored in your browser local storage and never leave your device.

Browsers require explicit permission before a page can read your GPS coordinates. You can decline and still use the manual latitude and longitude inputs instead. Nothing is read until you click Use my location.

The European AQI is an air quality index defined by the European Environment Agency. It is calculated from the concentration of five pollutants (PM2.5, PM10, ozone, nitrogen dioxide and sulphur dioxide) and reported on a scale of 0 to 100 and above. Values below 20 are good, 20 to 40 fair, 40 to 60 moderate, 60 to 80 poor, 80 to 100 very poor, and above 100 extremely poor.

PM2.5 is particulate matter with a diameter of 2.5 micrometres or less. These particles are small enough to penetrate deep into the lungs and bloodstream. Long-term exposure is linked to cardiovascular and respiratory disease. Typical good outdoor PM2.5 is under 12 µg/m³. Above 35 µg/m³ is a concern, above 55 is unhealthy.

It is a rough guide, not medical advice. The formula uses the UV index and multiplies by a factor based on the Fitzpatrick skin type (fair, medium, dark). Real burn time depends on altitude, reflection from snow or water, medication, and other personal factors. Use it as a hint, not as a substitute for sunscreen.

The UV index shown is the current forecast for your location, which accounts for cloud cover. The clear-sky value shows what the UV would be with no clouds. Comparing the two tells you how much the clouds are currently blocking.

The solar elevation and azimuth are calculated locally using the standard Simplified Solar Position algorithm. Accuracy is within about one degree for typical locations, which is far more than enough for photography, gardening and planning.

The moon phase uses the standard astronomical formula based on the number of days since the last known new moon on 6 January 2000. It is accurate to within a few hours of the true phase for the current date.

The page loads offline after the first visit, but fetching new data requires an internet connection. The moon phase, sun position and burn time can all be computed offline because they are calculated locally, but the weather and air quality require a live API call.

Not in this tool. Open-Meteo supports historical data and the tool could be extended to show it. For now, the focus is on live conditions and the seven day forecast.

The CAMS air quality model covers the entire globe but with different resolution in different regions. Some remote ocean and polar locations have no coverage. If the API cannot return a value for your location, the field shows "not available" rather than a false number.

Yes. The GPS button is designed for phones: tap once and the browser asks for permission. Saved locations work on mobile browsers and persist in local storage. The layout adapts to small screens.

Not yet. Pollen data is available in the Open-Meteo air quality API for some regions in Europe. Adding it is a future improvement. For now, focus on the air quality values that are available everywhere.

Yes, from Open-Meteo. The endpoints this tool calls are documented at open-meteo.com and air-quality-api.open-meteo.com. They are free for non-commercial use with a generous rate limit.

Yes. Any latitude from -90 to 90 and longitude from -180 to 180 is valid. The forecast model handles most altitudes; very high mountain peaks may be interpolated from the nearest grid point, so treat the numbers as approximate for extreme altitudes.