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Air quality · Oregon, United States

Portland Air Quality Index (AQI) today

Modelled estimate for 04:00 local time (UTC-8), refreshed 3 Nov, 07:52 UTC+0.

74 Moderate

Live estimate · modelled

US EPA AQI04:00 UTC-8, 3 Nov Main pollutant: PM2.5

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 79.

Over the next 24 hours the model expects the AQI to range from 56 around 15:00 to 88 around 22:00 (3 Nov).

348th most polluted of 849 cities worldwide right now, 5th of 25 in United States.

What to do today

  • Long walk or run outside OK, lighter if very sensitive
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

05:00 · 95 06:00 · 92 07:00 · 92 08:00 · 92 09:00 · 91 10:00 · 89 11:00 · 85 12:00 · 78 13:00 · 70 14:00 · 66 15:00 · 63 16:00 · 67 17:00 · 73 18:00 · 78 19:00 · 82 20:00 · 84 21:00 · 84 22:00 · 83 23:00 · 84 00:00 · 82 01:00 · 79 02:00 · 76 03:00 · 76 04:00 · 74 05:00 · 73 06:00 · 72 07:00 · 73 08:00 · 74 09:00 · 75 10:00 · 73 11:00 · 70 12:00 · 65 13:00 · 60 14:00 · 57 15:00 · 56 16:00 · 58 17:00 · 65 18:00 · 74 19:00 · 80 20:00 · 85 21:00 · 87 22:00 · 88 23:00 · 88 00:00 · 88 01:00 · 87 02:00 · 85 03:00 · 84 04:00 · 84 05:00 · 85 06:00 · 85 07:00 · 86 08:00 · 89 09:00 · 90 10:00 · 90 11:00 · 89 12:00 · 87 13:00 · 84 14:00 · 80 15:00 · 79 16:00 · 78 17:00 · 80 18:00 · 82 19:00 · 81 20:00 · 79 21:00 · 74 22:00 · 66 23:00 · 59 Now

US EPA AQI per hour, UTC-8. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 05:0095
Mon 06:0092
Mon 07:0092
Mon 08:0092
Mon 09:0091
Mon 10:0089
Mon 11:0085
Mon 12:0078
Mon 13:0070
Mon 14:0066
Mon 15:0063
Mon 16:0067
Mon 17:0073
Mon 18:0078
Mon 19:0082
Mon 20:0084
Mon 21:0084
Mon 22:0083
Mon 23:0084
Tue 00:0082
Tue 01:0079
Tue 02:0076
Tue 03:0076
Tue 04:00 · Now74
Tue 05:00 · Forecast73
Tue 06:00 · Forecast72
Tue 07:00 · Forecast73
Tue 08:00 · Forecast74
Tue 09:00 · Forecast75
Tue 10:00 · Forecast73
Tue 11:00 · Forecast70
Tue 12:00 · Forecast65
Tue 13:00 · Forecast60
Tue 14:00 · Forecast57
Tue 15:00 · Forecast56
Tue 16:00 · Forecast58
Tue 17:00 · Forecast65
Tue 18:00 · Forecast74
Tue 19:00 · Forecast80
Tue 20:00 · Forecast85
Tue 21:00 · Forecast87
Tue 22:00 · Forecast88
Tue 23:00 · Forecast88
Wed 00:00 · Forecast88
Wed 01:00 · Forecast87
Wed 02:00 · Forecast85
Wed 03:00 · Forecast84
Wed 04:00 · Forecast84
Wed 05:00 · Forecast85
Wed 06:00 · Forecast85
Wed 07:00 · Forecast86
Wed 08:00 · Forecast89
Wed 09:00 · Forecast90
Wed 10:00 · Forecast90
Wed 11:00 · Forecast89
Wed 12:00 · Forecast87
Wed 13:00 · Forecast84
Wed 14:00 · Forecast80
Wed 15:00 · Forecast79
Wed 16:00 · Forecast78
Wed 17:00 · Forecast80
Wed 18:00 · Forecast82
Wed 19:00 · Forecast81
Wed 20:00 · Forecast79
Wed 21:00 · Forecast74
Wed 22:00 · Forecast66
Wed 23:00 · Forecast59

Pollutants this hour

  • PM2.5 19.6 µg/m³ 24-hour mean 24.2 µg/m³ · 1.6× WHO’s 24-hour guideline (15) 74
  • PM10 22 µg/m³ 22
  • O₃ 19 µg/m³ 6
  • NO₂ 25 µg/m³ 12
  • SO₂ 1 µg/m³ 0
  • CO 0.20 mg/m³ 2

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Seattle Washington 102
Vancouver Canada 108
San Francisco California 55
Calgary Canada 54
San Jose California 59
Edmonton Canada 55
Los Angeles California 88

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Portland’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Portland right now?
74 on the US EPA scale (Moderate) at 04:00 UTC-8, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Portland today?
For most people, yes. The EPA’s statement for “Moderate”: Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. General guidance, not medical advice.

Will the air in Portland get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 56 around 15:00 to 88 around 22:00 (3 Nov). Forecasts beyond a day are less certain.

How does Portland compare with other cities?
Right now it is the 348th most polluted of 849 cities we track worldwide, and 5th of 25 in United States, all on the same US EPA scale.

Why does another app show a different AQI for Portland?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.