Today | Weather | Thursday, February 26, 2026

Weather in Portland, Maine

12:46 AM
Now
Cloudy Night
21° F
Feels Like
Precipitation 0 %
Wind 16 mph
Humidity 68 %
Today
Cloudy Weather
Day 37°
Night 12°
Precipitation 0 %
Wind 15 mph
UV Index (0 - 11+) 3
Overnight Frost 12 AM – 9 AM

Portland Weather Forecast Updated

Last updated on

Air Quality in Portland

NOW
75 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 23.6 µg/m³
PM10 26.22 µg/m³
O3 0.035 ppm
NO2 10.8 ppb
SO2 1 ppb
CO 0.26 ppm
NH3 0.06 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.523.6 µg/m³
PM1026.22 µg/m³
O369.5 µg/m³
NO220.39 µg/m³
SO22.64 µg/m³
CO296.08 µg/m³
NH30.06 µg/m³
NO0 µg/m³