Air quality in León, Castile and León, Spain today
Mr. Duck’s Air Quality Score
Moderate air today for León, Castile and León, 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 León today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).
Measurements recorded for the day show a PM2.5 concentration of 15.501282 µg/m³ and a PM10 level of 45.63438 µg/m³, based on 35 valid observations collected via OpenAQ. 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
León’s open‑air quality feed contains data for seven measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5) and sulphur dioxide (SO₂). The dataset comprises 11 individual rows collected from two monitoring stations, giving a modest spatial coverage across the city.
The most recent measurements were recorded on 2026‑02‑09 at 15:00 UTC for CO, NO₂, PM10, SO₂, PM2.5 and O₃, showing that half of the pollutants have fresh data within the last month. The only older entry is for NO, which was last updated on 2024‑01‑29 at 23:00 UTC, indicating a gap of more than two years for that compound. Typical values are fairly narrow: CO is consistently reported at 200 µg/m³, O₃ at 32 µg/m³ and PM2.5 at 6 µg/m³ across the available rows. NO₂ shows a broader spread from 9 to 38 µg/m³ with a median of 23.5 µg/m³, while SO₂ ranges between 2 and 14 µg/m³ (median 8 µg/m³). PM10 values are clustered tightly between 6 and 8 µg/m³.
Because the dataset relies on only two stations, conditions can differ noticeably across neighbourhoods that are not directly monitored. The presence of recent data for most pollutants provides a current snapshot, yet the outdated NO reading and limited station count mean that the picture is incomplete and should be interpreted as representative rather than exhaustive of city‑wide air quality.
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 dataset for León includes 35 valid measurements and is refreshed Updated within 3 days; the latest values were recorded on 2026‑02‑10T22:00:00+00:00. These figures represent a snapshot of conditions at the time of collection and may not reflect variations across different neighbourhoods or times of day within the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| BARRIO PINILLA | co | 200.0 | µg/m³ | 2026-02-09 15:00 UTC |
| BARRIO PINILLA | no | 10.0 | µg/m³ | 2024-01-29 23:00 UTC |
| BARRIO PINILLA | no2 | 38.0 | µg/m³ | 2026-02-09 15:00 UTC |
| BARRIO PINILLA | pm10 | 6.0 | µg/m³ | 2026-02-09 15:00 UTC |
| BARRIO PINILLA | pm25 | 6.0 | µg/m³ | 2026-02-09 15:00 UTC |
| BARRIO PINILLA | so2 | 2.0 | µg/m³ | 2026-02-09 15:00 UTC |
| LEÓN 4 | no | 1.0 | µg/m³ | 2024-01-29 23:00 UTC |
| LEÓN 4 | no2 | 9.0 | µg/m³ | 2026-02-09 15:00 UTC |
| LEÓN 4 | o3 | 32.0 | µg/m³ | 2026-02-09 15:00 UTC |
| LEÓN 4 | pm10 | 8.0 | µg/m³ | 2026-02-09 03:00 UTC |
| LEÓN 4 | so2 | 14.0 | µg/m³ | 2025-02-07 07:00 UTC |