Hourly Weather | Today Saturday, December 6, 2025
Portland, Maine
9 PM
Cloudy Night
28°
Feels Like 23°
37
Humidity: 86%
Wind: 8 mph
UV Index: 0
10 PM
Cloudy Night
30°
Feels Like 23°
14
Humidity: 88%
Wind: 8 mph
UV Index: 0
11 PM
Cloudy Night
28°
Feels Like 23°
14
Humidity: 86%
Wind: 8 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

9 PM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.92 µg/m³
  • PM10: 15.43 µg/m³
  • O3: 0.017 ppm
  • NO2: 17.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.26 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.82 µg/m³
  • PM10: 15.8 µg/m³
  • O3: 0.019 ppm
  • NO2: 15.4 ppb
  • SO2: 0.8 ppb
  • CO: 0.25 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.85 µg/m³
  • PM10: 14.08 µg/m³
  • O3: 0.022 ppm
  • NO2: 12.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.23 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.