Air quality in San Miguel de Allende, Guanajuato, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for San Miguel de Allende, Guanajuato, 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 in San Miguel de Allende is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 11.98 µg/m³.

Data for this assessment are shown via OpenAQ and are based on one valid measurement. 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 Miguel de Allende includes six measured pollutants – PM1, PM10, PM2.5, relative humidity, temperature and UM003 (particles per cubic centimetre). The information comes from eight individual rows of sensor data collected at two monitoring sites. Across the whole set only two of those rows are classified as recent: the latest PM10 reading was taken on 2025‑02‑27 16:00 UTC and the most up‑to‑date PM2.5 value dates to 2026‑02‑10 22:00 UTC. All other measurements (PM1, relative humidity, temperature and UM003) have no timestamp attached, so their freshness is unknown.

For the particulate matter fractions where multiple observations exist, the values span a modest range. PM10 concentrations vary from about 2.8 µg/m³ at the low end to 19.8 µg/m³ at the high end, with a median of roughly 11.3 µg/m³; ten‑percentile and ninety‑percentile points sit near 4.5 µg/m³ and 18.1 µg/m³ respectively. PM2.5 shows an even broader spread, from just above zero (0.20 µg/m³) up to almost 12 µg/m³, median around 6.1 µg/m³, with the tenth and ninetieth percentiles at about 1.38 µg/m³ and 10.80 µg/m³. By contrast, PM1 is represented by a single constant value of 4.56 µg/m³, while relative humidity, temperature and UM003 each have one recorded figure – roughly 9.35 %, 18.5 °C and 1 059 particles/cm³ respectively.

Because most rows are flagged as old or unknown (six out of eight), the coverage is uneven: recent data exist for only the two larger PM fractions, while the other parameters lack timely updates. Consequently, while the available numbers give a snapshot of typical conditions in San Miguel de Allende, they do not capture the full spatial and temporal variability that can occur across the city.

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 reading for San Miguel de Allende is based on a single valid measurement and was refreshed recently, with data updated within 3 days (last update: 2026‑02‑10 22:00 UTC). This snapshot reflects conditions at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may vary locally and temporally.

OpenAQ station rows