Air quality in Celaya, Guanajuato, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for Celaya, 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 Celaya today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 16.4 µg/m³ and a PM10 level of 141.23 µg/m³, based on sixteen valid observations reported through 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

The dataset for Celaya pulls information from four monitoring sites that together contribute 26 recent observations across the eight pollutants tracked: carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), ozone (O₃), particulate matter ≤10 µm (PM₁₀), particulate matter ≤2.5 µm (PM₂.₅) and sulfur dioxide (SO₂). All of the newest readings were recorded on 2026‑02‑10 at 22:00 UTC, which falls within the “updated within three days” freshness window for every pollutant.

Carbon monoxide shows a median concentration of about 0.82 ppm with values ranging from 0.44 to 1.30 ppm, while ozone’s median is roughly 0.031 ppm and spans 0.001 to 0.068 ppm. Particulate matter exhibits the widest spread: PM₁₀ averages 95.7 µg/m³ but varies from 42 to 141 µg/m³, and PM₂.₅ centers around 20.5 µg/m³ with a narrower range of 15.2 to 24.6 µg/m³. Sulfur dioxide is measured at a median of 0.0062 ppm (range 0.0046–0.0077 ppm). The nitrogen‑oxide family is captured by only two stations each, producing very tight intervals—NO from 0.00225 to 0.00234 ppm, NO₂ from 0.00815 to 0.00852 ppm and NOX from 0.01135 to 0.01139 ppm.

While most pollutants have full coverage from all four stations, the nitrogen‑oxide series relies on just half that number, resulting in fewer data points for those gases. Additionally, ten of the 26 rows are older than 30 days, indicating that some historical values may not reflect current conditions. Because monitoring locations and update times differ across substances, the snapshot represents a mix of recent and slightly dated information, and air quality can vary throughout the city depending on where and when measurements were taken.

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 Celaya reflects 16 valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of citywide air quality, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these aggregate figures.

OpenAQ station rows