SmogRank / United States / Oregon

Air quality in Portland

Oregon, United States. PM2.5 from 5 reference monitors, updated hourly.

3.4 µg/m³
Good

Latest hour (04:00 UTC), 0.2× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#2,094
of 2,330 · 3.8 µg/m³
30 days
#1,742
of 2,327 · 5.1 µg/m³
Year
#2,071
of 2,160 · 4.8 µg/m³

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 2.3 µg/m³2026-10-01 01:00 UTC: 2.3 µg/m³2026-10-01 02:00 UTC: 2.5 µg/m³2026-10-01 03:00 UTC: 3.7 µg/m³2026-10-01 04:00 UTC: 3.4 µg/m³Sep 28Sep 29Sep 30Oct 1

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 6.7 µg/m³2025-09-30: 3.2 µg/m³2025-10-01: 2.9 µg/m³2025-10-02: 3.8 µg/m³2025-10-03: 7.6 µg/m³2025-10-04: 5.1 µg/m³2025-10-05: 4.6 µg/m³2025-10-06: 4.6 µg/m³2025-10-07: 5.0 µg/m³2025-10-08: 4.6 µg/m³2025-10-09: 6.6 µg/m³2025-10-10: 6.5 µg/m³2025-10-11: 3.7 µg/m³2025-10-12: 4.9 µg/m³2025-10-13: 3.1 µg/m³2025-10-14: 3.0 µg/m³2025-10-15: 5.3 µg/m³2025-10-16: 10.6 µg/m³2025-10-17: 9.4 µg/m³2025-10-18: 9.6 µg/m³2025-10-19: 3.8 µg/m³2025-10-20: 5.1 µg/m³2025-10-21: 8.7 µg/m³2025-10-22: 11.0 µg/m³2025-10-23: 9.9 µg/m³2025-10-24: 6.3 µg/m³2025-10-25: 3.2 µg/m³2025-10-26: 3.4 µg/m³2025-10-27: 4.6 µg/m³2025-10-28: 6.4 µg/m³2025-10-29: 8.4 µg/m³2025-10-30: 6.8 µg/m³2025-10-31: 15.9 µg/m³2025-11-01: 5.5 µg/m³2025-11-02: 5.1 µg/m³2025-11-03: 5.2 µg/m³2025-11-04: 5.0 µg/m³2025-11-05: 3.7 µg/m³2025-11-06: 3.9 µg/m³2025-11-07: 6.0 µg/m³2025-11-08: 6.2 µg/m³2025-11-09: 4.5 µg/m³2025-11-10: 12.8 µg/m³2025-11-11: 9.9 µg/m³2025-11-12: 16.2 µg/m³2025-11-13: 18.7 µg/m³2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: 6.0 µg/m³2025-11-21: 11.5 µg/m³2025-11-22: 16.8 µg/m³2025-11-23: 10.5 µg/m³2025-11-24: 6.2 µg/m³2025-11-25: 6.4 µg/m³2025-11-26: 3.8 µg/m³2025-11-27: 2.8 µg/m³2025-11-28: 2.2 µg/m³2025-11-29: 4.2 µg/m³2025-11-30: 5.3 µg/m³2025-12-01: 10.3 µg/m³2025-12-02: 12.2 µg/m³2025-12-03: 13.5 µg/m³2025-12-04: 12.4 µg/m³2025-12-05: 2.8 µg/m³2025-12-06: 4.8 µg/m³2025-12-07: 3.3 µg/m³2025-12-08: 2.6 µg/m³2025-12-09: 3.8 µg/m³2025-12-10: 1.6 µg/m³2025-12-11: 2.5 µg/m³2025-12-12: 7.3 µg/m³2025-12-13: 10.0 µg/m³2025-12-14: 9.8 µg/m³2025-12-15: 4.5 µg/m³2025-12-16: 2.7 µg/m³2025-12-17: 3.3 µg/m³2025-12-18: 3.2 µg/m³2025-12-19: 3.3 µg/m³2025-12-20: 2.8 µg/m³2025-12-21: 4.5 µg/m³2025-12-22: 2.2 µg/m³2025-12-23: 3.4 µg/m³2025-12-24: 3.5 µg/m³2025-12-25: 3.9 µg/m³2025-12-26: 2.9 µg/m³2025-12-27: 5.3 µg/m³2025-12-28: 9.2 µg/m³2025-12-29: 3.1 µg/m³2025-12-30: 3.9 µg/m³2025-12-31: 5.4 µg/m³2026-01-01: 5.8 µg/m³2026-01-02: 4.5 µg/m³2026-01-03: 4.7 µg/m³2026-01-04: 2.2 µg/m³2026-01-05: 5.9 µg/m³2026-01-06: 4.2 µg/m³2026-01-07: 2.5 µg/m³2026-01-08: 3.0 µg/m³2026-01-09: 5.2 µg/m³2026-01-10: 8.6 µg/m³2026-01-11: 7.9 µg/m³2026-01-12: 9.9 µg/m³2026-01-13: 15.7 µg/m³2026-01-14: 16.4 µg/m³2026-01-15: 8.4 µg/m³2026-01-16: 4.0 µg/m³2026-01-17: 4.6 µg/m³2026-01-18: 4.8 µg/m³2026-01-19: 4.6 µg/m³2026-01-20: 5.0 µg/m³2026-01-21: 5.1 µg/m³2026-01-22: 5.5 µg/m³2026-01-23: 5.4 µg/m³2026-01-24: 8.0 µg/m³2026-01-25: 12.0 µg/m³2026-01-26: 9.0 µg/m³2026-01-27: 10.7 µg/m³2026-01-28: 11.0 µg/m³2026-01-29: 4.2 µg/m³2026-01-30: 4.8 µg/m³2026-01-31: 4.1 µg/m³2026-02-01: 5.2 µg/m³2026-02-02: 4.7 µg/m³2026-02-03: 3.6 µg/m³2026-02-04: 3.4 µg/m³2026-02-05: 4.9 µg/m³2026-02-06: 4.2 µg/m³2026-02-07: 5.8 µg/m³2026-02-08: 3.2 µg/m³2026-02-09: 2.9 µg/m³2026-02-10: 3.9 µg/m³2026-02-11: 4.0 µg/m³2026-02-12: 8.6 µg/m³2026-02-13: 5.3 µg/m³2026-02-14: 5.1 µg/m³2026-02-15: 4.0 µg/m³2026-02-16: 3.6 µg/m³2026-02-17: 2.9 µg/m³2026-02-18: 3.2 µg/m³2026-02-19: 3.3 µg/m³2026-02-20: 4.1 µg/m³2026-02-21: 2.4 µg/m³2026-02-22: 2.8 µg/m³2026-02-23: 3.2 µg/m³2026-02-24: 3.3 µg/m³2026-02-25: 4.5 µg/m³2026-02-26: 7.1 µg/m³2026-02-27: 7.1 µg/m³2026-02-28: 6.7 µg/m³2026-03-01: 6.7 µg/m³2026-03-02: 6.9 µg/m³2026-03-03: 5.6 µg/m³2026-03-04: 2.3 µg/m³2026-03-05: 3.7 µg/m³2026-03-06: 5.1 µg/m³2026-03-07: 3.0 µg/m³2026-03-08: 2.6 µg/m³2026-03-09: 3.7 µg/m³2026-03-10: 3.5 µg/m³2026-03-11: 2.2 µg/m³2026-03-12: 2.8 µg/m³2026-03-13: 2.0 µg/m³2026-03-14: 2.2 µg/m³2026-03-15: 2.8 µg/m³2026-03-16: 5.1 µg/m³2026-03-17: 4.6 µg/m³2026-03-18: 4.7 µg/m³2026-03-19: 5.1 µg/m³2026-03-20: 4.8 µg/m³2026-03-21: 2.4 µg/m³2026-03-22: 2.4 µg/m³2026-03-23: 4.1 µg/m³2026-03-24: 3.8 µg/m³2026-03-25: 2.6 µg/m³2026-03-26: 4.6 µg/m³2026-03-27: 3.2 µg/m³2026-03-28: 3.3 µg/m³2026-03-29: 2.9 µg/m³2026-03-30: 2.3 µg/m³2026-03-31: 3.0 µg/m³2026-04-01: 2.5 µg/m³2026-04-02: 2.4 µg/m³2026-04-03: 4.8 µg/m³2026-04-04: 3.9 µg/m³2026-04-05: 3.2 µg/m³2026-04-06: 3.6 µg/m³2026-04-07: 3.5 µg/m³2026-04-08: 4.5 µg/m³2026-04-09: 4.7 µg/m³2026-04-10: 4.6 µg/m³2026-04-11: 2.8 µg/m³2026-04-12: 2.5 µg/m³2026-04-13: 2.3 µg/m³2026-04-14: 2.2 µg/m³2026-04-15: 2.2 µg/m³2026-04-16: 2.5 µg/m³2026-04-17: 3.7 µg/m³2026-04-18: 3.6 µg/m³2026-04-19: 3.4 µg/m³2026-04-20: 3.9 µg/m³2026-04-21: 3.1 µg/m³2026-04-22: 2.7 µg/m³2026-04-23: 4.7 µg/m³2026-04-24: 5.0 µg/m³2026-04-25: 3.7 µg/m³2026-04-26: 4.1 µg/m³2026-04-27: 5.6 µg/m³2026-04-28: 3.5 µg/m³2026-04-29: 5.0 µg/m³2026-04-30: 5.5 µg/m³2026-05-01: 6.4 µg/m³2026-05-02: 7.6 µg/m³2026-05-03: 10.5 µg/m³2026-05-04: 5.1 µg/m³2026-05-05: 4.5 µg/m³2026-05-06: 5.1 µg/m³2026-05-07: 4.3 µg/m³2026-05-08: 5.4 µg/m³2026-05-09: 4.5 µg/m³2026-05-10: 2.4 µg/m³2026-05-11: 2.7 µg/m³2026-05-12: 3.5 µg/m³2026-05-13: 2.5 µg/m³2026-05-14: 2.3 µg/m³2026-05-15: 2.8 µg/m³2026-05-16: 2.3 µg/m³2026-05-17: 2.5 µg/m³2026-05-18: 3.2 µg/m³2026-05-19: 2.6 µg/m³2026-05-20: 2.9 µg/m³2026-05-21: 4.1 µg/m³2026-05-22: 4.0 µg/m³2026-05-23: 2.6 µg/m³2026-05-24: 4.0 µg/m³2026-05-25: 3.2 µg/m³2026-05-26: 2.2 µg/m³2026-05-27: 3.4 µg/m³2026-05-28: 4.3 µg/m³2026-05-29: 2.8 µg/m³2026-05-30: 2.7 µg/m³2026-05-31: 2.8 µg/m³2026-06-01: 3.4 µg/m³2026-06-02: 3.7 µg/m³2026-06-03: 3.4 µg/m³2026-06-04: 2.3 µg/m³2026-06-05: 2.4 µg/m³2026-06-06: 2.1 µg/m³2026-06-07: 2.5 µg/m³2026-06-08: 3.2 µg/m³2026-06-09: 1.9 µg/m³2026-06-10: 2.2 µg/m³2026-06-11: 2.7 µg/m³2026-06-12: 2.4 µg/m³2026-06-13: 3.2 µg/m³2026-06-14: 3.4 µg/m³2026-06-15: 6.1 µg/m³2026-06-16: 2.4 µg/m³2026-06-17: 3.0 µg/m³2026-06-18: 3.1 µg/m³2026-06-19: 3.6 µg/m³2026-06-20: 4.1 µg/m³2026-06-21: 3.8 µg/m³2026-06-22: 4.1 µg/m³2026-06-23: 4.4 µg/m³2026-06-24: 4.0 µg/m³2026-06-25: 3.7 µg/m³2026-06-26: 2.2 µg/m³2026-06-27: 1.8 µg/m³2026-06-28: 2.5 µg/m³2026-06-29: 2.0 µg/m³2026-06-30: 2.9 µg/m³2026-07-01: 3.8 µg/m³2026-07-02: 3.1 µg/m³2026-07-03: 2.8 µg/m³2026-07-04: 3.4 µg/m³2026-07-05: 5.0 µg/m³2026-07-06: 4.5 µg/m³2026-07-07: 4.0 µg/m³2026-07-08: 2.1 µg/m³2026-07-09: 2.8 µg/m³2026-07-10: 3.0 µg/m³2026-07-11: 2.1 µg/m³2026-07-12: 2.1 µg/m³2026-07-13: 2.9 µg/m³2026-07-14: 3.6 µg/m³2026-07-15: 4.1 µg/m³2026-07-16: 5.0 µg/m³2026-07-17: 3.8 µg/m³2026-07-18: 3.6 µg/m³2026-07-19: 3.9 µg/m³2026-07-20: 4.8 µg/m³2026-07-21: 11.6 µg/m³2026-07-22: 13.4 µg/m³2026-07-23: 5.3 µg/m³2026-07-24: 3.6 µg/m³2026-07-25: 2.9 µg/m³2026-07-26: 2.0 µg/m³2026-07-27: 2.5 µg/m³2026-07-28: 2.7 µg/m³2026-07-29: 3.1 µg/m³2026-07-30: 3.4 µg/m³2026-07-31: 3.5 µg/m³2026-08-01: 2.0 µg/m³2026-08-02: 3.3 µg/m³2026-08-03: 17.1 µg/m³2026-08-04: 40.7 µg/m³2026-08-05: 53.0 µg/m³2026-08-06: 27.1 µg/m³2026-08-07: 11.5 µg/m³2026-08-08: 4.6 µg/m³2026-08-09: 3.3 µg/m³2026-08-10: 3.4 µg/m³2026-08-11: 2.7 µg/m³2026-08-12: 2.6 µg/m³2026-08-13: 7.5 µg/m³2026-08-14: 7.8 µg/m³2026-08-15: 5.6 µg/m³2026-08-16: 5.0 µg/m³2026-08-17: 8.5 µg/m³2026-08-18: 12.6 µg/m³2026-08-19: 5.5 µg/m³2026-08-20: 7.4 µg/m³2026-08-21: 7.3 µg/m³2026-08-22: 3.7 µg/m³2026-08-23: 2.4 µg/m³2026-08-24: 6.2 µg/m³2026-08-25: 6.5 µg/m³2026-08-26: 2.5 µg/m³2026-08-27: 2.3 µg/m³2026-08-28: 2.7 µg/m³2026-08-29: 3.3 µg/m³2026-08-30: 4.0 µg/m³2026-08-31: 18.8 µg/m³2026-09-01: 3.6 µg/m³2026-09-02: 3.2 µg/m³2026-09-03: 3.9 µg/m³2026-09-04: 4.0 µg/m³2026-09-05: 4.7 µg/m³2026-09-06: 4.2 µg/m³2026-09-07: 4.2 µg/m³2026-09-08: 4.8 µg/m³2026-09-09: 5.4 µg/m³2026-09-10: 6.2 µg/m³2026-09-11: 4.9 µg/m³2026-09-12: 3.8 µg/m³2026-09-13: 2.8 µg/m³2026-09-14: 3.6 µg/m³2026-09-15: 5.2 µg/m³2026-09-16: 5.4 µg/m³2026-09-17: 5.2 µg/m³2026-09-18: 7.3 µg/m³2026-09-19: 7.5 µg/m³2026-09-20: 8.4 µg/m³2026-09-21: 5.9 µg/m³2026-09-22: 2.7 µg/m³2026-09-23: 4.1 µg/m³2026-09-24: 3.8 µg/m³2026-09-25: 2.9 µg/m³2026-09-26: 5.1 µg/m³2026-09-27: 3.3 µg/m³2026-09-28: 4.5 µg/m³2026-09-29: 3.0 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

11 of 359 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2277OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 8.3 µg/m³Jan 2026: 6.7 µg/m³JanFeb 2025: 5.7 µg/m³Feb 2026: 4.4 µg/m³FebMar 2025: 4.7 µg/m³Mar 2026: 3.7 µg/m³MarApr 2025: 3.5 µg/m³Apr 2026: 3.7 µg/m³AprMay 2025: 3.5 µg/m³May 2026: 3.8 µg/m³MayJun 2025: 4.0 µg/m³Jun 2026: 3.1 µg/m³JunJul 2025: 3.8 µg/m³Jul 2026: 4.0 µg/m³JulAug 2025: 5.2 µg/m³Aug 2026: 9.4 µg/m³AugSep 2025: 7.0 µg/m³Sep 2026: 4.5 µg/m³SepOct 2025: 6.3 µg/m³OctNov 2025: 7.4 µg/m³NovDec 2025: 5.3 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 3.8 µg/m³3.820252025: 7.8 µg/m³7.8

Mean PM2.5 for 23 Sept to 29 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Portland - SE LafayeUS Public DomainAirNowReference
Portland Cully HelenUS Public DomainAirNowReference
Portland McDaniel HiUS Public DomainAirNowReference
SW Barnes Road in east Washington County OregonCC BY 4.0RogereLow-cost
Near Wilshire ParkCC BY 4.0AirGradientLow-cost
Pearl DistrictCC BY 4.0MikeLow-cost
Woodstock Neighborhood, Portland, ORCC BY 4.0AirGradientLow-cost
Portland Benson HighUS Public DomainAirNowReference
Portland Lincoln HigUS Public DomainAirNowReference
LaurelhurstCC BY 4.0NLow-cost
SalusaCC BY 4.0AirGradientLow-cost
Clinton ParkCC BY 4.0AirGradientLow-cost
48th PlaceCC BY 4.0AirGradientLow-cost
SellwoodCC BY 4.0AirGradientLow-cost
Kenton BackyardCC BY 4.0AirGradientLow-cost
Cully GreenCC BY 4.0AirGradientLow-cost
GSCCC BY 4.0AirGradientLow-cost
Flamingo ParkCC BY 4.0AirGradientLow-cost
Madison SouthCC BY 4.0AirGradientLow-cost
South TaborCC BY 4.0AirGradientLow-cost

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in United States

Calexico 22.9Jurupa Valley 12.9Riverside 12.4Little Rock 12.2Hanford 12.0Oceanside 11.9Laredo 11.4Clovis 11.2Fontana 11.2Corcoran 11.1Shreveport 11.0Wake Forest 11.0

30-day averages, µg/m³. All of United States →

Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.