Eugene, Oregon, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Eugene, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (11th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 29 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 11th Oct - 12th Oct 2025
Eugene, Oregon, United States
7 AM11th Oct 2025
7 PM
6 AM12th Oct 2025
28AQI
25AQI
35AQI
18AQI
In the last 24 hours,
Eugene's AQI reached its highest point of 35 at 6 AM during the Night, while the lowest point, 18, was recorded at 4 AM during the Night between 11th Oct and 12th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Eugene, Oregon, United States
19°C15/26°C
17°C13/25°C
17°C14/21°C
17°C9/27°C
21°C11/35°C
20°C14/30°C
18°C13/27°C
20°C11/31°C
18°C13/25°C
15°C12/18°C
16°C6/27°C
19°C8/30°C
20°C9/33°C
19°C11/27°C
16°C7/27°C
17°C7/29°C
17°C9/28°C
15°C12/18°C
15°C10/22°C
15°C11/20°C
15°C10/21°C
14°C9/22°C
15°C11/22°C
15°C9/25°C
16°C5/30°C
17°C7/31°C
12°C7/18°C
12°C6/18°C
13°C10/19°C
12°C8/16°C
--°C/°C
33AQI
27AQI
31AQI
28AQI
2025 Days Vs Air Quality
Eugene, Oregon, United States
95%
269
5%
15
Total number of days with different AQI categories in last 285 days in 2025 (80 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 285 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Eugene, Oregon, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI
31AQI
24AQI
21AQI
21AQI
27AQI
41AQI
53AQI
51AQI
34AQI
36AQI
39AQI
35AQI
36AQI
38AQI
38AQI
39AQI
35AQI
54AQI
63AQI
55AQI
70AQI
74AQI
67AQI
48AQI
50AQI
65AQI
69AQI
59AQI
50AQI
35AQI
25AQI
28AQI
28AQI
34AQI
25AQI
29AQI
25AQI
24AQI
31AQI
35AQI
33AQI
40AQI
32AQI
28AQI
25AQI
23AQI
21AQI
22AQI
22AQI
22AQI
26AQI
24AQI
21AQI
24AQI
23AQI
30AQI
30AQI
36AQI
33AQI
22AQI
19AQI
22AQI
25AQI
25AQI
25AQI
24AQI
24AQI
21AQI
28AQI
19AQI
18AQI
17AQI
17AQI
15AQI
17AQI
17AQI
17AQI
15AQI
15AQI
16AQI
17AQI
18AQI
28AQI
27AQI
17AQI
18AQI
16AQI
26AQI
16AQI
17AQI
19AQI
21AQI
27AQI
23AQI
21AQI
15AQI
14AQI
14AQI
17AQI
17AQI
17AQI
20AQI
25AQI
26AQI
24AQI
26AQI
23AQI
20AQI
18AQI
15AQI
15AQI
21AQI
29AQI
21AQI
21AQI
20AQI
16AQI
17AQI
19AQI
28AQI
19AQI
14AQI
15AQI
18AQI
20AQI
18AQI
17AQI
25AQI
20AQI
15AQI
15AQI
14AQI
18AQI
18AQI
19AQI
14AQI
16AQI
18AQI
14AQI
16AQI
16AQI
18AQI
23AQI
15AQI
14AQI
20AQI
23AQI
17AQI
21AQI
25AQI
17AQI
22AQI
23AQI
18AQI
20AQI
26AQI
19AQI
30AQI
33AQI
35AQI
33AQI
32AQI
24AQI
21AQI
23AQI
23AQI
19AQI
16AQI
18AQI
18AQI
14AQI
14AQI
22AQI
36AQI
31AQI
19AQI
16AQI
15AQI
19AQI
27AQI
25AQI
17AQI
16AQI
17AQI
22AQI
22AQI
22AQI
27AQI
18AQI
16AQI
19AQI
21AQI
21AQI
18AQI
22AQI
33AQI
28AQI
28AQI
22AQI
21AQI
20AQI
22AQI
25AQI
20AQI
17AQI
16AQI
17AQI
18AQI
20AQI
20AQI
26AQI
20AQI
17AQI
21AQI
26AQI
26AQI
18AQI
16AQI
17AQI
22AQI
24AQI
37AQI
32AQI
32AQI
17AQI
15AQI
13AQI
16AQI
16AQI
18AQI
18AQI
19AQI
32AQI
47AQI
46AQI
46AQI
57AQI
41AQI
33AQI
28AQI
29AQI
39AQI
26AQI
34AQI
57AQI
57AQI
55AQI
39AQI
34AQI
33AQI
28AQI
39AQI
39AQI
29AQI
37AQI
17AQI
19AQI
30AQI
26AQI
23AQI
38AQI
34AQI
23AQI
22AQI
29AQI
48AQI
49AQI
27AQI
30AQI
39AQI
38AQI
19AQI
17AQI
18AQI
28AQI
31AQI
34AQI
24AQI
29AQI
40AQI
26AQI
39AQI
29AQI
45AQI
27AQI
20AQI
20AQI
18AQI
23AQI
21AQI
27AQI
34AQI
29AQI
No. of days
202526AQI
Highest AQI recorded in
January45AQI
Lowest AQI recorded in
May18AQI
202424AQI
Highest AQI recorded in
December35AQI
Lowest AQI recorded in
May16AQI
202325AQI
Highest AQI recorded in
November42AQI
Lowest AQI recorded in
April11AQI
202228AQI
Highest AQI recorded in
October50AQI
Lowest AQI recorded in
July15AQI
202124AQI
Highest AQI recorded in
November31AQI
Lowest AQI recorded in
February18AQI
202041AQI
Highest AQI recorded in
September140AQI
Lowest AQI recorded in
June20AQI
Most & Least Polluted Years Over the Last 6 Years
Eugene's annual 2025 AQI (26) shows an average percentage change of -3.7% (improved AQI) compared to previous years: 2020 (41), 2021 (24), 2022 (28), 2023 (25), 2024 (24).