Air quality in Tijuana, Baja California, Mexico today
Mr. Duck’s Air Quality Score
Moderate air today for Tijuana, Baja California, Mexico
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Tijuana today is classified as Moderate. The primary pollutant measured is PM2.5 (fine particles), with a reported concentration of 25.01 µg/m³ based on two valid observations from OpenAQ data.
Data for this assessment come from two recent measurements, and no PM10 value is available. 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 OpenAQ feed for Tijuana includes seven measured pollutants – carbon monoxide (CO), nitrogen oxides (NO, NO₂, NOX), ozone (O₃), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All data come from three monitoring stations, each providing a single row of observations for the listed gases. The most recent measurements are from 2026‑02‑10 20:00 UTC for PM2.5 and O₃, while CO was last updated on 2024‑03‑01 17:00 UTC; NO₂ and NO were recorded on 2024‑03‑25 16:00 UTC, NOX on 2024‑01‑16 00:00 UTC and SO₂ on 2023‑01‑20 19:00 UTC. Thus only two pollutants have data from the past week, whereas the others are older than a year.
Across the three stations the observed values span modest ranges. PM2.5 varies between 16.8 and 25.0 µg/m³ with a median of about 20 µg/m³; CO ranges from 0.019 to 2.15 ppm, median roughly 1.08 ppm; NO₂ is low, from 0.00033 to 0.0117 ppm (median ≈0.006 ppm); O₃ sits between 0.012 and 0.021 ppm (median ≈0.0165 ppm). The single‑value readings for NO, NOX and SO₂ are all at the same level recorded at La Mesa: 0.018 ppm for NO, 0.00645 ppm for NOX and 0.0277 ppm for SO₂.
Because most pollutant rows are dated several months or years ago, the dataset captures only a snapshot of conditions rather than continuous coverage. The limited number of stations (three) and uneven freshness—only PM2.5 and O₃ have recent updates—means that spatial and temporal variations within Tijuana may not be fully represented in this feed.
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 reflects two valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 20:00 UTC. This snapshot provides a brief view of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in Tijuana.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Laboratorio | co | 0.018810008 | ppm | 2021-01-19 20:00 UTC |
| Laboratorio | no2 | 0.000332693686 | ppm | 2021-09-21 17:00 UTC |
| Laboratorio | o3 | 0.012178662 | ppm | 2021-09-21 17:00 UTC |
| Laboratorio | pm25 | 20.0081454 | µg/m³ | 2021-01-19 20:00 UTC |
| La Mesa | co | 2.1455748 | ppm | 2024-03-01 17:00 UTC |
| La Mesa | no | 0.0180820636 | ppm | 2024-03-25 16:00 UTC |
| La Mesa | no2 | 0.011721604299999999 | ppm | 2024-03-25 16:00 UTC |
| La Mesa | nox | 0.00644998264 | ppm | 2024-01-16 00:00 UTC |
| La Mesa | o3 | 0.0208719654 | ppm | 2026-02-10 20:00 UTC |
| La Mesa | pm25 | 25.0101146 | µg/m³ | 2026-02-10 20:00 UTC |
| La Mesa | so2 | 0.0276504331 | ppm | 2023-01-20 19:00 UTC |
| Tijuana | pm25 | 16.8 | µg/m³ | 2025-03-04 12:00 UTC |