Today | Weather | Wednesday, April 29, 2026

Weather in Portland, Maine

02:40 AM
Now
Cloudy Weather
43° F
Feels Like 37°
Precipitation 2 %
Wind 8 mph
Humidity 85 %
Today
Rainy Weather
Day 46°
Night 43°
Precipitation 80 %
Wind 10 mph
UV Index (0 - 11+) 2

Portland Weather Forecast Updated

3 minutes ago
Last updated on

Air Quality in Portland

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.05 µg/m³
PM10 3.93 µg/m³
O3 0.042 ppm
NO2 2.3 ppb
SO2 0.4 ppb
CO 0.14 ppm
NH3 0.07 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)
PM2.52.05 µg/m³
PM103.93 µg/m³
O381.91 µg/m³
NO24.33 µg/m³
SO20.96 µg/m³
CO156.39 µg/m³
NH30.07 µg/m³
NO0 µg/m³