Highest air pollution Bar Harbor, today and tomorrow
Today (25 June): Air quality in Bar Harbor is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 45.5/100).
Tomorrow (26 June 2026): Air quality in Bar Harbor is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 36.6/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Acadia National Park's air quality benefits from its exceptional Maine Atlantic coast island position on Mount Desert Island, with consistent Atlantic and Gulf of Maine sea breezes providing outstanding maritime ventilation around this famous Maine coastal park. The remote coastal wilderness and the open ocean exposure generally maintain excellent conditions, while summer photochemical ozone transported from the Boston-New York corridor on prevailing southwesterlies is the primary documented air quality concern and the park generally maintains very good conditions throughout most of the year.
Today - 25 June | Pollution peaks at 08:00
AQI:
Medium
45.5/100
PM2.5 (fine particles):
Good
9.9/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
45.5/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
8.5/100
PM1 (ultrafine particles):
Good
6.1/100
Levels show the poorest local air quality during the day
Tomorrow - 26 June | Pollution peaks at 12:00
AQI:
Fair
36.6/100
PM2.5 (fine particles):
Good
9.5/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
36.6/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
10.0/100
PM1 (ultrafine particles):
Good
5.9/100
Pollen forecast in Bar Harbor
View pollen forecastFrequently Asked Questions
Is air quality bad in Bar Harbor right now?
On 25 June 2026, overall air quality in Bar Harbor is medium. AQI is the main air quality indicator at 45.5/100. Pollution peaks around 8:00 AM (O3: 45.5/100).
Will air quality be worse tomorrow in Bar Harbor?
On 26 June 2026, air quality conditions in Bar Harbor will be worse than today, with AQI forecast at fair at 36.6/100. Pollution peaks around 12:00 PM (O3: 36.6/100).
Are air quality levels in Bar Harbor based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 25 June 2026 at 09:01 CET (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team