Air quality in Cary, North Carolina, United States of America today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Cary, Illinois, 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 Cary, North Carolina is classified as USG. The primary pollutant identified is PM2.5.

Measurements from OpenAQ show a PM2.5 concentration of 37.55 µg/m³ based on eleven valid observations. A total of eleven measurements were used to calculate the displayed value. The reported PM2.5 value corresponds to the reference measurement of 37.55250015258789 µg/m³. No PM10 data are currently provided. Data are shown via OpenAQ and represent the latest available sampling for Cary. The eleven valid readings provide a snapshot of ambient conditions during the monitoring period. 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

Cary’s OpenAQ feed currently includes six measured pollutants – PM1, PM2.5, PM10, relative humidity, temperature and particle count (UM003) – drawn from a total of 23 recent data rows collected at four monitoring stations in the city. For five of those pollutants the most recent observation was recorded on 2026‑02‑11, which falls within the last seven days, indicating fairly fresh coverage for PM1, PM2.5, relative humidity, temperature and UM003. The PM10 series is older; its latest entry dates to 2025‑01‑13, so that metric reflects conditions from more than a year ago.

Across the recent rows, PM1 values range from a low of 0.008 µg/m³ up to a high of 24.51 µg/m³, with a median near 16.71 µg/m³, showing most readings cluster in the mid‑teens. PM2.5 spans 0.35 µg/m³ to 37.55 µg/m³ and centers around 25.94 µg/m³, indicating a broader spread toward higher concentrations. Relative humidity measurements sit between 30.51 % and 47.62 %, with a typical value of about 39.76 %. Temperature in the city varies from 16.21 °C to 27.21 °C, medianing at roughly 19.23 °C; the most recent reading was 20.36 °C. Particle counts (UM003) are reported in particles per cubic centimetre and range widely from 163.98 to 4 981.40, with a median of 3 385.48 and the latest figure at 4 751.20.

Because PM10 data are considerably older than the other pollutants, any analysis that relies on that metric should be treated cautiously. The overall dataset shows good temporal freshness for most parameters but uneven coverage across pollutants, meaning city‑wide conditions can differ by location and time, especially where only legacy PM10 values are available.

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 11 valid measurements and was Updated today (last refreshed at 2026-02-11T00:00:00+00:00). These values represent a snapshot of ambient conditions across Cary, North Carolina, but air quality can vary by location and time within the city. Consequently, the figures should be considered indicative rather than definitive for any specific neighborhood or moment.

OpenAQ station rows