Portland, OR Air Quality in February
Across 2019–2025, Portland's February air quality had a median AQI of 41 (Good) over 198 monitored days in the Portland-Vancouver-Hillsboro, OR-WA area. 0.5% of February days (1 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 68.7% of days. The cleanest February on record here was 2024 (median AQI 34, 0 days above 100) and the worst was 2023 (median 42, 1 day above 100, peak AQI 106).
- Good: 63.1%
- Moderate: 36.4%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Portland in February?
Good on a typical day: median AQI 41 across 2019–2025, with 0.5% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓63.1% of February days were Good (AQI 0–50), 36.4% Moderate (51–100).
- ✓1 day of 198 reached AQI 101+; the February peak was 106.
- ✓Best February: 2024; worst February: 2023.
Frequently asked questions
What is the air quality like in Portland in February?▾
Across 2019–2025, the median daily AQI in Portland in February was 41 (Good). 63.1% of days were Good, 36.4% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Portland?▾
A typical February day in Portland sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes Portland's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 68.7% of February days in Portland. The highest February AQI recorded in 2019–2025 was 106 (Unhealthy for Sensitive Groups), in 2023.
Portland February air quality, year by year
Portland February air quality by year (Portland-Vancouver-Hillsboro, OR-WA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 41 | 0 | 86 | PM2.5 |
| 2020 | 29 | 51 | 0 | 68 | PM2.5 |
| 2021 | 28 | 44 | 0 | 65 | PM2.5 |
| 2022 | 28 | 50 | 0 | 76 | PM2.5 |
| 2023worst | 28 | 42 | 1 | 106 | PM2.5 |
| 2024cleanest | 29 | 34 | 0 | 64 | PM2.5 |
| 2025 | 28 | 38 | 0 | 66 | PM2.5 |
What February air means in Portland
A typical February day in Portland sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 41 is in line with Portland's whole-year median of 41, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Portland runs in line with the national February norm; 0.5% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Portland's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Portland
The latest EPA AirNow observation puts Portland's AQI at 29 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Portland air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Portland-Vancouver-Hillsboro, OR-WA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.