Air quality in San Juan del Río, Querétaro, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for San Juan del Río, Querétaro, Mexico

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality today in San Juan del Río is rated as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 21.13 µg/m³, based on seven valid observations reported through 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 San Juan del Río draws from a single monitoring station that contributed seven rows of data, one row for each of the measured pollutants: carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), ozone (O₃), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All values were recorded at the same moment – 2026‑02‑10 22:00 UTC – and each pollutant’s record is marked as having been updated within the last seven days, so the information reflects a very recent snapshot of air quality in the city.

Because there is only one station, every pollutant shows a single value with no observed spread. The minimum, median and 90th‑percentile figures are identical for each component: CO registers at 0.42 ppm, NO at 0.00284 ppm, NO₂ at 0.01248 ppm, NOX at 0.01531 ppm, O₃ at 0.09816 ppm, PM2.5 at 21.13 µg/m³ and SO₂ at 0.00403 ppm. This uniformity indicates that the dataset does not capture spatial or temporal variability within San Juan del Río; any fluctuations in pollutant concentrations across different neighborhoods or times of day are not represented.

In practical terms, the city’s air‑quality picture on this platform is limited to a single point measurement taken at one recent timestamp. While the data are fresh, the lack of multiple stations or repeated observations means that broader trends, daily cycles, or localized hotspots cannot be inferred from these numbers alone. Users should keep in mind that conditions can differ elsewhere in San Juan del Río and may change over time beyond what this snapshot shows.

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 San Juan del Río reflects seven valid measurements and is marked as “Updated within 3 days,” with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. This snapshot provides a timely view of current conditions, but air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows