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Air Quality History for Portland, United States

Historical PM2.5 and AQI trend from monitoring stations near Portland, United States.

44
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

392h

PM2.5 Station

392h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-10-21 44 41–46 10.4 µg/m³ 2h 2
2026-10-20 34 10–78 8.4 µg/m³ 22h 1
2026-10-19 23 2–38 5.6 µg/m³ 21h 1
2026-10-18 18 1–47 4.4 µg/m³ 20h 1
2026-10-17 21 3–58 5.2 µg/m³ 21h 1
2026-10-16 28 5–54 6.8 µg/m³ 19h 1
2026-10-15 30 13–76 7.8 µg/m³ 19h 1
2026-10-14 25 3–51 5.9 µg/m³ 23h 1
2026-10-13 34 17–57 8.2 µg/m³ 18h 1
2026-10-12 33 7–140 9.2 µg/m³ 15h 1
2026-10-11 30 4–56 7.4 µg/m³ 11h 1
2026-10-10 40 5–61 9.9 µg/m³ 21h 1
2026-10-09 36 15–77 9.0 µg/m³ 19h 2
2026-10-08 36 17–63 8.9 µg/m³ 19h 2
2026-10-07 37 11–70 9.2 µg/m³ 21h 2
2026-10-06 37 9–57 9.0 µg/m³ 19h 1
2026-10-05 35 1–49 8.3 µg/m³ 21h 2
2026-10-04 41 24–65 10.2 µg/m³ 21h 1
2026-10-03 32 5–78 8.1 µg/m³ 20h 1
2026-10-02 31 9–62 7.5 µg/m³ 23h 1
2026-10-01 43 15–105 11.5 µg/m³ 17h 2
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