Air quality in Mexicali, Baja California, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for Mexicali, Baja California, 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 Mexicali is rated as Moderate. The primary pollutant identified is PM2.5, fine particulate matter measured against a reference value of 11.0 µg/m³. Data from OpenAQ includes nine valid measurements for the current assessment.

PM10 levels are also reported with a reference value of 104.0 µg/m³, providing additional context to the overall air quality picture. 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 Mexicali air‑quality dataset currently contains eight measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO2), combined nitrogen oxides (NOX), ozone (O3), particulate matter ≤ 10 µm (PM10), particulate matter ≤ 2.5 µm (PM2.5) and sulfur dioxide (SO2). Data come from seven monitoring rows, but the number of stations varies by pollutant: five rows report O3, four rows report NO2, three rows report CO, two rows each report NO, NOX, PM10 and PM2.5, while only a single row provides SO2 values.

All recent measurements were recorded on 2026‑02‑10 at 22:00 UTC, except for SO2 which dates back to 2025‑12‑11 at 18:00 UTC and is therefore flagged as old data. The freshest timestamps are thus within the last week for most pollutants, giving a fairly up‑to‑date picture of current conditions, but the single SO2 reading is several months older.

Across the available data, concentrations show considerable spread. PM2.5 values range from 6 µg/m³ to just over 500 µg/m³, with a median of 11 µg/m³; O3 varies between 0.001 ppm and 0.0268 ppm (median ≈ 0.0033 ppm); NO2 spans 0.0056‑0.0489 ppm (median ≈ 0.0128 ppm). CO values are clustered tighter, from 0.33 to 0.4619 ppm (median = 0.444 ppm). PM10 measurements lie between 43 and 104 µg/m³ (median = 73.5 µg/m³).

Because the number of rows differs markedly among pollutants and one key gas (SO2) is based on an older record, the dataset does not capture a uniform snapshot across all contaminants. Consequently, while recent readings give a clear view for most gases and particles, conditions in Mexicali can still vary by location and time beyond what these limited stations reflect.

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 Mexicali reflects nine valid measurements and was updated within three days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. These values represent a snapshot of ambient conditions across the city; air quality can differ by specific location and time of day, so individual experiences may vary from the summary presented here.

OpenAQ station rows