Air quality in Delaware City, Delaware, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Delaware City, Delaware, United States of America
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Delaware City is rated as Good today. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 8.5 µg/m³ based on two valid observations reported through OpenAQ.
No other pollutants reached reporting thresholds, and the data reflect the current monitoring snapshot for this location. 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 air‑quality record for Delaware City includes data from a single monitoring location on Route 9, providing measurements of fine particulate matter (PM2.5) and sulfur dioxide (SO₂). Both pollutants are reported with the same most recent timestamp of 2026‑02‑10 23:00 UTC, meaning the latest values are less than seven days old. Because there is only one sensor feeding data for each pollutant, the dataset contains just two rows in total—one row per measured contaminant.
For PM2.5 the reported concentration is consistently 8.5 µg/m³ across the minimum, median and maximum values, with the 10th‑percentile and 90th‑percentile also equal to 8.5 µg/m³. This indicates that, within the limited sample period captured by the sensor, the fine‑particle level has not varied; every recorded reading is identical. The SO₂ measurement shows a similarly uniform pattern, with all statistical points—minimum, median, maximum, and both percentiles—equal to 0.0001 ppm. As with PM2.5, there is no observed spread in the sulfur dioxide data.
The dataset’s narrow scope means coverage is very limited: only one monitoring site contributes information for each pollutant, and all values are from a single recent update. Consequently, while the timestamps are fresh, the lack of multiple stations or historical depth restricts insight into spatial or temporal fluctuations across Delaware City. Conditions can differ in other neighborhoods or at different times, but those variations are not captured by the current data set.
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 Delaware City reflects two valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides a brief view of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Rte 9 Del. City | pm25 | 8.5 | µg/m³ | 2026-02-10 23:00 UTC |
| Rte 9 Del. City | so2 | 0.0001 | ppm | 2026-02-10 23:00 UTC |