Air quality in Piedras Negras, Coahuila, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for Piedras Negras, Coahuila, 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 Piedras Negras, Coahuila is currently classified as Moderate. The primary pollutant identified is PM10 (coarser particles). Four separate monitoring points contributed to the assessment, providing a basis for the reported category. Data is shown via OpenAQ, which aggregates information from local monitoring stations.

The latest readings indicate a PM2.5 value of 3.0105 µg/m³ and a PM10 value of 67.086 µg/m³. These measurements correspond to the reference values used in the evaluation. The values represent the most recent set of observations. All measurements were recorded on the same day. The dataset reflects current atmospheric conditions. 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 Piedras Negras air‑quality record pulls six pollutant measurements from a single OpenAQ‑registered monitor located at the Centro de Rehabilitación DIF. The data set therefore consists of six rows, one for each of the pollutants carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM₁₀), particulate matter ≤ 2.5 µm (PM₂.₅) and sulfur dioxide (SO₂). All values are reported in the standard units used by the network – ppm for the gases and µg/m³ for the particulates.

The timestamps show a mixed picture of recency. The most recent updates, all recorded on 2026‑02‑10 06:00 UTC, are for O₃, PM₁₀ and SO₂, placing three of the six readings comfortably within the last 30 days. By contrast, the CO reading dates back to 2024‑07‑31 04:00 UTC, the NO₂ value is from 2020‑12‑15 13:00 UTC, and the PM₂.₅ measurement was logged on 2026‑01‑24 13:00 UTC. This uneven timing means that half of the pollutants reflect current conditions while the others capture older episodes.

Each pollutant is represented by a single observation, so the reported minimum, median and maximum are identical. CO registers 0.0045763 ppm, NO₂ 0.0022433 ppm, O₃ 0.00075657 ppm, PM₁₀ 67.086 µg/m³, PM₂.₅ 3.0105 µg/m³ and SO₂ 0.0058422 ppm. Because there is no spread of values, the dataset provides a snapshot rather than a range of variability for the city’s air quality. Users should keep in mind that conditions can differ across neighborhoods and over time, and the limited number of stations and the age of some readings may not capture the full picture.

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

Data are based on 4 valid measurements and are updated within 30 days. The latest update was recorded on 2026-02-10 at 06:00 UTC. This snapshot reflects conditions at the time of sampling and may not represent variations across different neighborhoods or times of day within Piedras Negras, Coahuila. Users should consider local factors when interpreting the reported air quality values.

OpenAQ station rows