What is the air quality in Portland today?

The current Air Quality Index (AQI) in Portland is 45 (Good). PM2.5 concentration is 10.85 µg/m³.

What is the temperature in Portland right now?

The current temperature in Portland is 17.5°C (feels like 17.5°C). Humidity is 73.0% and wind speed is 22.7 km/h.

Is it safe to go outside in Portland?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Portland, United States

Cloudy

17.5°C · 73.0% humidity

17.5°

Feels 17.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

54 5pm

45 8pm

31 11pm

26 2am

25 5am

25 8am

24 11am

25 2pm

Air Quality Index Trend

30h · 1 stn

View full history →

Portland's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

73.0%

Humidity

22.7 km/h

Wind NE

1015.7 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

10.85 µg/m³

PM10

27.45 µg/m³

050100150200300500

What is the weather forecast for Portland?

Temperature & Precipitation

PM2.5 Trend

30h · 1 station

PM2.510.85 µg/m³ ✓ WHO

Good

PM1027.45 µg/m³

Good

UV INDEX0.7

Low

What is the 7-day forecast for Portland?

07-22

22.1° 15.5°

1.12 mm

07-23

26.7° 20.9°

0.13 mm

07-24

24.4° 15.2°

1.56 mm

07-25

27.0° 20.1°

3.5 mm

07-26

22.6° 18.6°

3.62 mm

07-27

27.9° 18.6°

07-28

34.5° 22.4°

Both models agree Avg diff: 3.7°C

What cities are near Portland?

45 South Portland 28 South Portland Gardens 33 Westbrook 25 West Scarborough 23 Saco 32 Biddeford 13 Lewiston 17 Laconia 36 Amesbury 40 Newburyport

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-22T00:24 UTC.