Air quality in Bar Harbor, Maine, United States of America today

Mr. Duck’s Air Quality Score

Good air today for Bar Harbor, Maine, 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 in Bar Harbor, Maine is classified as Good today. The primary pollutant measured is PM2.5 (fine particles). Recent observations show a PM2.5 reference value of 2.7 µg/m³ and a PM10 reference value of 6.0 µg/m³ based on six valid measurements.

These values indicate that the particulate concentrations are within the range associated with the Good category. 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 Bar Harbor air‑quality record draws from a single monitoring location, Acacia National Park – McFarlan, so the dataset contains one row of measurements for each pollutant. All six common pollutants are represented: carbon monoxide (CO), nitrogen oxide (NO), ozone (O₃), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5) and sulfur dioxide (SO₂). The most recent reading for every pollutant was logged on 2026‑02‑10 at 23:00 UTC, meaning the data are fresh within the past week.

Across the six pollutants the observed values show virtually no variation because each metric has a single recorded point. CO is measured at 0.1 ppm, NO registers as 0.0 ppm, and O₃ appears at 0.044 ppm. Particulate concentrations are low, with PM10 at 6.0 µg/m³ and PM2.5 at 2.7 µg/m³, while SO₂ is detected at 0.0001 ppm. Because there is only one measurement per pollutant, the minimum, median, maximum, 10th percentile and 90th percentile are all identical for each component.

The dataset’s limited spatial coverage—just one station—means it cannot capture variations that might occur elsewhere in Bar Harbor or at different times of day. While the timestamps indicate recent updates, the lack of multiple rows or historic records restricts any assessment of trends or day‑to‑day fluctuations. Users should keep in mind that conditions can differ across neighborhoods and over time, and the current figures reflect only the snapshot captured at the Acadia NP – McFarlan site on 2026‑02‑10.

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 six valid measurements and was updated within three days, with the most recent reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides a current view of Bar Harbor’s air quality but note that conditions can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows