Today | Weather | Friday, January 16, 2026

Weather in Portland, Maine

05:06 AM
Now
Cloudy Night
21° F
Feels Like
Precipitation 7 %
Wind 16 mph
Humidity 63 %
Today
Cloudy Weather
Day 27°
Night 25°
Precipitation 3 %
Wind 15 mph
UV Index (0 - 11+) 2

Portland Weather Forecast Updated

41 minutes ago
Last updated on

Air Quality in Portland

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.5 µg/m³
PM10 0.82 µg/m³
O3 0.033 ppm
NO2 2.1 ppb
SO2 0.3 ppb
CO 0.15 ppm
NH3 0.21 µg/m³
NO 0 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)
PM2.50.5 µg/m³
PM100.82 µg/m³
O365.61 µg/m³
NO23.96 µg/m³
SO20.76 µg/m³
CO167.1 µg/m³
NH30.21 µg/m³
NO0 µg/m³