Air quality in Monterrey, Nuevo León, Mexico today

Mr. Duck’s Air Quality Score

Moderate air today for Monterrey, Nuevo León, 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 Monterrey, Nuevo León, Mexico is currently classified as Moderate. The main pollutant identified is PM2.5. The measured PM2.5 concentration is 10.01 µg/m³, while PM10 is recorded at 61.0 µg/m³. These values are based on 24 valid measurements. The snapshot was recorded at 2026-02-23 00:00 UTC. The PM2.5 level of 10.01 µg/m³ aligns with the reference threshold used for this assessment, while the PM10 level of 61.0 µg/m³ also matches its reference point. Both pollutants are measured in micrograms per cubic meter. These measurements are part of the daily monitoring routine for the city. The data reflects conditions across multiple monitoring sites within the metropolitan area.

Data is shown via 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 OpenAQ feed for Monterrey, Nuevo León contains 61 recent measurement rows collected at five monitoring stations. For this city the dataset provides values for carbon monoxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), ozone (O₃), fine particulate matter (PM₂.5), coarse particulate matter (PM₁₀), and sulfur dioxide (SO₂). The other listed parameters—PM1, relative humidity, temperature and the UM003 field—are not currently reported in the available rows, so no numeric values can be shown for them.

All eight pollutants have a most‑recent timestamp of 2026‑02‑10 22:00 UTC, meaning the newest data are about two weeks old. Freshness categories show that none of the 61 rows were recorded today, within the last three days, or within the last week; 24 rows were updated within the past 30 days, 32 are older than 30 days, and five have an unknown age. This mix indicates that recent coverage is limited and that conditions can differ across locations and times. For PM₂.5 the observed values range from a minimum of 10.01 µg/m³ to a maximum of 389.07 µg/m³, with a median of 22.0 µg/m³ and the 10th‑percentile at 11.40 µg/m³ and the 90th‑percentile at 156.62 µg/m³, illustrating a wide spread. Carbon monoxide varies between 0.47 ppm and 3.05 ppm (median 1.25 ppm), while ozone spans 0.017 ppm to 0.094 ppm (median 0.057 ppm). The nitrogen‑oxide series show similar breadth, with NO₂ ranging from 0.0126 ppm to 0.0303 ppm (median 0.0188 ppm) and NOX from 0.0156 ppm to 0.0382 ppm (median 0.0226 ppm). Together, these figures reveal that the dataset captures a diverse set of conditions but that many observations are dated, so the picture of current air quality in Monterrey is necessarily incomplete.

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 set includes 24 valid measurements and is updated within 30 days. The most recent update was recorded on 2026-02-10 at 22:00 UTC. This snapshot reflects conditions for Monterrey, Nuevo León, but air quality can vary by location and time within the city, so values may not represent every neighborhood or moment.

OpenAQ station rows