Today | Weather | Sunday, October 26, 2025

Weather in Portland, Maine

10:05 AM
Now
Cloudy Weather
46° F
Feels Like 45°
Precipitation 22 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 71 %
Today
Partly Sunny with Showers
Day 54°
Night 39°
Precipitation 55 %
Wind 8 mph
UV Index (0 - 11+) 2

Portland Weather Forecast Updated

13 minutes ago
Last updated on

Air Quality in Portland

NOW
21 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.74 µg/m³
PM10 1.59 µg/m³
O3 0.023 ppm
NO2 3.2 ppb
SO2 0.3 ppb
CO 0.13 ppm
NH3 0.3 µg/m³
NO 1.9 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.50.74 µg/m³
PM101.59 µg/m³
O344.27 µg/m³
NO25.97 µg/m³
SO20.82 µg/m³
CO145.57 µg/m³
NH30.3 µg/m³
NO1.9 µg/m³