Today | Weather | Tuesday, April 7, 2026

Weather in Portland, Maine

11:47 AM
Now
Snowy Weather
36° F
Feels Like 28°
Precipitation 51 %
Wind 9 mph
UV Index (0 - 11+) 1
Humidity 80 %
Today
Snowy Weather
Day 39°
Night 27°
Precipitation 97 %
Wind 8 mph
UV Index (0 - 11+) 1
Overnight Frost 5 AM – 6 AM

Portland Weather Forecast Updated

9 minutes ago
Last updated on

Air Quality in Portland

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.22 µg/m³
PM10 1.85 µg/m³
O3 0.049 ppm
NO2 5.1 ppb
SO2 0.6 ppb
CO 0.16 ppm
NH3 0.25 µg/m³
NO 1.25 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)
PM2.51.22 µg/m³
PM101.85 µg/m³
O396.05 µg/m³
NO29.57 µg/m³
SO21.5 µg/m³
CO184.31 µg/m³
NH30.25 µg/m³
NO1.25 µg/m³