Air quality in Belfast, Maine, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Belfast, Northern Ireland, United Kingdom
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 Belfast, Maine is classified as Moderate. The primary pollutant measured is PM2.5 (fine particles). The PM2.5 reference value is 13.0 µg/m³, and the PM10 reference value is 23.0 µg/m³. Both PM2.5 and PM10 concentrations are expressed in micrograms per cubic meter. The dataset includes twelve valid observations collected during the reporting period. These figures represent the latest available readings for the city.
Data is shown via OpenAQ, which aggregates measurements from participating monitoring stations. The reported values are derived from the most recent measurement cycle. The information reflects conditions for the current day. 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 Belfast, Maine air‑quality feed contains five measured pollutants: PM1, PM2.5, relative humidity, temperature and UM003 (particle count). All five observations come from a single monitoring location, giving a total of five data rows. Each pollutant was last recorded on 2026‑01‑27 at 20:00 UTC, and every entry falls into the “within 30 days” freshness category, meaning the most recent measurements are all less than a month old.
Because each pollutant has only one recorded value, the dataset shows no internal range: the minimum, median, maximum, 10th percentile and 90th percentile are identical for every metric. PM1 registers at 0.43018181540749295 µg/m³, PM2.5 at 1.2061818174340508 µg/m³, relative humidity at 23.762499930641866 %, temperature at 3.93804542909969 °C, and UM003 at 102.57500013871626 particles/cm³. This uniformity indicates that the current snapshot captures a single moment rather than a distribution of values over time.
The limited station coverage—just one site—means the figures represent conditions at that specific point in Belfast and may not reflect variations across other neighborhoods or micro‑environments. While the data are fresh, the lack of multiple rows or historic points restricts insight into short‑term fluctuations. Users should keep in mind that air quality can differ by location and time, so the presented numbers provide a precise but narrowly scoped view of Belfast’s atmospheric state at the recorded moment.
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
This report is based on 12 valid measurements and was updated within 30 days. The latest data were recorded on 2026-02-10T20:00:00+00:00. Please note that air quality can vary by location and time within the city, so this snapshot may not reflect conditions at every spot or moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Belfast | pm1 | 0.43018181540749295 | µg/m³ | 2026-01-27 20:00 UTC |
| Belfast | pm25 | 1.2061818174340508 | µg/m³ | 2026-01-27 20:00 UTC |
| Belfast | relativehumidity | 23.762499930641866 | % | 2026-01-27 20:00 UTC |
| Belfast | temperature | 3.93804542909969 | c | 2026-01-27 20:00 UTC |
| Belfast | um003 | 102.57500013871626 | particles/cm³ | 2026-01-27 20:00 UTC |