Air quality in Mérida, Extremadura, Spain today
Mr. Duck’s Air Quality Score
Moderate air today for Mérida, Extremadura, Spain
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Mérida today is classified as Moderate. The primary pollutant identified is PM2.5, with a measured concentration of 14.42 µg/m³ based on four valid observations reported through OpenAQ.
Data indicate that fine particulate matter remains the dominant factor influencing the current air quality assessment. 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 Mérida includes six measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM₁₀) and sulfur dioxide (SO₂). All of these come from a single monitoring station, so the coverage is limited to one location within the city. The most recent observations are from late August 2025 for CO, NO₂, O₃ and PM₁₀, recorded at 05:00 UTC on 2025‑08‑25, while the latest NO reading dates back to 21 February 2024 (00:00 UTC) and the most recent SO₂ value is from 30 May 2024 (08:00 UTC). Because only one row exists for each pollutant, the overall freshness of the data leans heavily toward older measurements.
Across the pollutants the recorded values show a fairly wide spread. CO ranges from 500 to 600 µg/m³ with a median of 550 µg/m³, indicating that the highest observed concentration is 100 µg/m³ above the minimum. Ozone varies between 42 and 82 µg/m³, with a median of 62 µg/m³; the 90th‑percentile reaches 78 µg/m³, close to the maximum. PM₁₀ values are lower, spanning 17 to 37 µg/m³ and centering around 27 µg/m³. In contrast, NO is reported as a single constant value of 2.3 µg/m³, and SO₂ appears only as –1.0 µg/m³, suggesting either sensor issues or missing data for those gases.
The dataset therefore provides a snapshot of air‑quality conditions at one point in time rather than a continuous city‑wide picture. While the CO, NO₂, O₃ and PM₁₀ measurements are relatively recent, the lack of newer entries for NO and SO₂ means that current levels for these pollutants cannot be confirmed from this source. Users should keep in mind that conditions can differ across Mérida and may have changed since the last recorded timestamps.
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 current dataset for Mérida includes four valid measurements and is updated within three days, with the latest values recorded at 2026‑02‑10T21:00:00+00:00. These figures represent a snapshot of conditions across the monitoring network; air quality can differ by specific location and time of day within the city, so individual experiences may vary from the reported averages.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| MERIDA | no | 2.3 | µg/m³ | 2024-02-21 00:00 UTC |
| MERIDA | no2 | 7.0 | µg/m³ | 2025-08-21 08:00 UTC |
| MERIDA | o3 | 42.0 | µg/m³ | 2025-08-21 08:00 UTC |
| MERIDA | pm10 | 17.0 | µg/m³ | 2025-08-21 08:00 UTC |
| MERIDA | no2 | 4.6 | µg/m³ | 2025-08-25 05:00 UTC |
| MERIDA | o3 | 82.0 | µg/m³ | 2025-08-25 05:00 UTC |
| MERIDA | pm10 | 37.0 | µg/m³ | 2025-08-25 05:00 UTC |