Air quality in Calexico, California, United States of America today

Mr. Duck’s Air Quality Score

Moderate air today for Calexico, California, United States of America

⚠️ 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 Calexico, California is rated as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 12.6 and a PM10 reference value of 55.0, based on seven valid observations.

These values reflect the current assessment provided through OpenAQ data. 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 Calexico air‑quality record draws from a single monitoring site on Ethel Street, so every pollutant reading comes from one location. The dataset includes carbon monoxide (CO), nitrogen oxides (NO, NO₂ and NOX), ozone (O₃), fine particulate matter (PM₂.5) and coarse particulate matter (PM₁₀), plus sulfur dioxide (SO₂). Freshness varies: the most recent updates for NO, NO₂, NOX, O₃, PM₂.5, PM₁₀ and SO₂ were all logged on 2026‑02‑10 at 23:00 UTC, meaning they are within the last seven days. The CO measurement is older, recorded on 2023‑08‑01 at 20:00 UTC, so its value reflects conditions from more than two years ago.

Across the pollutants, observed concentrations span a wide range. CO sits at a low 0.1 ppm, while ozone reaches up to 0.053 ppm and nitrogen dioxide peaks at 0.0063 ppm; both gases show modest spreads between their minimums (O₃ 0.042 ppm, NO₂ 0.003 ppm) and maximums. Particulate matter shows the greatest variability: PM₁₀ ranges from 55 µg/m³ to 117 µg/m³, with a median of 86 µg/m³, whereas PM₂.5 varies between 3 µg/m³ and 12.6 µg/m³, median 7.8 µg/m³. Sulfur dioxide is measured at very low levels, from essentially zero up to 0.0008 ppm, with a median of 0.0004 ppm. The nitrogen species are tightly clustered: NO and NOX each have a single reported value (0.004 ppm for NO, 0.0103 ppm for NOX), and the NO₂ distribution is narrow, with the 10th percentile at 0.00333 ppm and the 90th at 0.00597 ppm.

Because only one station supplies data, spatial differences across Calexico are not captured, and the older CO reading highlights a gap in recent coverage for that pollutant. Users should keep in mind that conditions can change throughout the city and over time, especially for pollutants with limited or outdated observations.

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 Calexico reflects seven valid measurements and was updated within three days, with the most recent reading recorded at 2026‑02‑10T23:00:00+00:00. This snapshot provides a current view of ambient air quality but should be interpreted as a brief overview; conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows