Air quality in Heidelberg, Baden-Württemberg, Germany today
Mr. Duck’s Air Quality Score
Moderate air today for Heidelberg, Baden-Württemberg, Germany
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Heidelberg today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 value of 10.0 µg/m³ and a PM10 value of 13.0 µg/m³, based on four valid observations recorded via OpenAQ.
This assessment reflects the current monitoring data without additional interpretation. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
The dataset for Heidelberg contains measurements for five key pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or smaller (PM10) and particulate matter 2.5 µm or smaller (PM2.5). All values are expressed in micrograms per cubic metre (µg/m³). The information comes from a single monitoring station, giving one row of data for each pollutant, so the coverage is limited to that location rather than city‑wide.
The most recent observations were recorded on 2026-02-10 at 17:00 UTC for NO₂, O₃, PM10 and PM2.5, meaning those four pollutants are updated within the last three days. The NO measurement is older, dated 2024-03-11 at 11:00 UTC, so it reflects conditions from almost two years ago. Because each pollutant has only one recorded value, the minimum, median and maximum are identical – for example, NO₂ consistently reads 29.497 µg/m³, O₃ 26.727 µg/m³, PM10 13.0 µg/m³ and PM2.5 10.0 µg/m³ across the dataset.
With just five rows of data, there is no spread or variability to analyse; the reported figures represent a single snapshot per pollutant at the monitoring site. The freshness gap between NO and the other four compounds highlights that not all pollutants are captured with the same timeliness. Consequently, while the available numbers give a clear picture of current concentrations for most pollutants, they do not convey city‑wide variations or recent changes in nitrogen monoxide levels. Users should keep in mind that conditions can differ across neighborhoods and over time, especially where data are older or limited to one station.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The data shown for Heidelberg are based on four valid measurements and were refreshed recently, with the latest update recorded on 2026‑02‑10 at 17:00 UTC (updated within 3 days). This snapshot reflects conditions at the time of collection; air quality can differ across neighbourhoods and change throughout the day, so values may not represent every location or moment in the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Heidelberg | no | 4.0 | µg/m³ | 2024-03-11 11:00 UTC |
| Heidelberg | no2 | 29.497 | µg/m³ | 2026-02-10 17:00 UTC |
| Heidelberg | o3 | 26.727 | µg/m³ | 2026-02-10 17:00 UTC |
| Heidelberg | pm10 | 13.0 | µg/m³ | 2026-02-10 17:00 UTC |
| Heidelberg | pm25 | 10.0 | µg/m³ | 2026-02-10 17:00 UTC |