Air Quality Index
Health Guidance:
Air quality is good. Ideal for outdoor activities!
For Sensitive Groups:
Safe for all groups, including children and people with asthma.
Nearest Monitoring Station
Acadia NP - McFarlan
HANCOCK • 2.9 mi away
The Air Quality Index (AQI) is calculated from pollutant levels and tells you how clean or unhealthy the air is. Lower AQI values mean better air quality. PM2.5 is the most important indicator of health risk.
Primary Health Indicator(Most important for health)
PM2.5
OpenAQ0.4
µg/m³(micrograms per cubic meter)
What it is: Tiny particles less than 2.5 micrometers in diameter that can penetrate deep into lungs and bloodstream. The single most important air quality measurement for health.
📊 24-hour trend analysis will be available after we've collected a full day of measurements. Current air quality data above is accurate and up-to-date. Check back tomorrow to see how conditions are changing over time.
Other Particulate Matter
PM10
OpenAQ0
µg/m³(micrograms per cubic meter)
Larger particles (up to 10 micrometers) from dust, pollen, and mold. Can irritate airways.
Gaseous Pollutants
SO₂
OpenAQ0
ppm(parts per million)
Sulfur dioxide from industrial processes and power plants. Can trigger asthma and breathing difficulties.
NO
OpenAQ0
ppm(parts per million)
Nitrogen oxide from combustion. Contributes to smog and respiratory issues.
CO
OpenAQ0.1
ppm(parts per million)
Carbon monoxide from vehicle exhaust. Reduces oxygen delivery to body tissues. Dangerous in enclosed spaces.
O₃
OpenAQ0.032
ppm(parts per million)
Ground-level ozone forms when pollutants react in sunlight. Can cause breathing problems and reduce lung function.
Measurements updated: 11/6/2025, 5:00:00 AM
Data Sources
Current air quality from OpenAQ. Forecasts provided by EPA AirNow.
Data Attribution:
Station: Acadia NP - McFarlan (ID: 1236) • Updated: 11/6/2025, 5:58:09 AM • 2.9 mi away