Today | Weather | Thursday, February 5, 2026

Weather in Portland, Maine

08:37 PM
Now
Cloudy Night
19° F
Feels Like 10°
Precipitation 0 %
Wind 8 mph
Humidity 68 %
Today
Cloudy Night
Day 32°
Night 10°
Precipitation 0 %
Wind 8 mph

Portland Weather Forecast Updated

Last updated on

Air Quality in Portland

NOW
47 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 11.28 µg/m³
PM10 14.7 µg/m³
O3 0.018 ppm
NO2 18.7 ppb
SO2 0.5 ppb
CO 0.32 ppm
NH3 2.47 µg/m³
NO 0.12 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)
PM2.511.28 µg/m³
PM1014.7 µg/m³
O335.22 µg/m³
NO235.16 µg/m³
SO21.32 µg/m³
CO363.53 µg/m³
NH32.47 µg/m³
NO0.12 µg/m³