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!
September Air Quality Analysis
Eugene, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 47 of Good air quality on the same day.
Day & Night AQI Trend: 28th Sep - 29th Sep 2026
Eugene, Oregon, United States
6 AM28th Sep 2026
7 PM
5 AM29th Sep 2026
75AQI
24AQI
56AQI
20AQI
In the last 24 hours,
Eugene's AQI reached its highest point of 75 at 7 AM during the Day, while the lowest point, 20, was recorded at 11 PM during the Night between 28th Sep and 29th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Eugene, Oregon, United States
18°C10/29°C
18°C15/24°C
15°C12/18°C
14°C11/20°C
14°C11/18°C
16°C11/23°C
15°C11/19°C
16°C10/25°C
18°C9/28°C
20°C11/32°C
19°C9/31°C
15°C9/22°C
14°C9/20°C
13°C10/18°C
14°C9/20°C
14°C9/19°C
16°C9/25°C
16°C11/25°C
16°C11/22°C
16°C10/24°C
17°C11/25°C
16°C11/23°C
15°C10/21°C
15°C10/22°C
15°C10/23°C
12°C10/14°C
12°C8/17°C
13°C7/20°C
13°C7/20°C
15°C10/22°C
52AQI
39AQI
47AQI
38AQI
2026 Days Vs Air Quality
Eugene, Oregon, United States
79%
213
21%
56
Total number of days with different AQI categories in last 272 days in 2026 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 79%
Health Risk Level:
Low
In 2026, 79% of 272 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Eugene, Oregon, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
72AQI (US)
49AQI (US)
19AQI (US)
14AQI (US)
21AQI (US)
32AQI (US)
11AQI (US)
11AQI (US)
14AQI (US)
24AQI (US)
22AQI (US)
28AQI (US)
54AQI (US)
64AQI (US)
38AQI (US)
30AQI (US)
48AQI (US)
58AQI (US)
60AQI (US)
64AQI (US)
74AQI (US)
49AQI (US)
53AQI (US)
48AQI (US)
45AQI (US)
47AQI (US)
41AQI (US)
46AQI (US)
51AQI (US)
54AQI (US)
44AQI (US)
46AQI (US)
48AQI (US)
49AQI (US)
47AQI (US)
48AQI (US)
43AQI (US)
41AQI (US)
47AQI (US)
44AQI (US)
45AQI (US)
41AQI (US)
41AQI (US)
49AQI (US)
48AQI (US)
38AQI (US)
45AQI (US)
45AQI (US)
41AQI (US)
41AQI (US)
38AQI (US)
35AQI (US)
38AQI (US)
40AQI (US)
47AQI (US)
43AQI (US)
36AQI (US)
38AQI (US)
37AQI (US)
41AQI (US)
62AQI (US)
47AQI (US)
47AQI (US)
40AQI (US)
33AQI (US)
41AQI (US)
42AQI (US)
37AQI (US)
37AQI (US)
42AQI (US)
41AQI (US)
40AQI (US)
34AQI (US)
35AQI (US)
39AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
42AQI (US)
37AQI (US)
37AQI (US)
40AQI (US)
38AQI (US)
32AQI (US)
28AQI (US)
29AQI (US)
30AQI (US)
26AQI (US)
26AQI (US)
25AQI (US)
32AQI (US)
31AQI (US)
27AQI (US)
31AQI (US)
28AQI (US)
31AQI (US)
27AQI (US)
33AQI (US)
29AQI (US)
31AQI (US)
30AQI (US)
26AQI (US)
31AQI (US)
33AQI (US)
32AQI (US)
29AQI (US)
29AQI (US)
33AQI (US)
27AQI (US)
27AQI (US)
24AQI (US)
26AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
24AQI (US)
24AQI (US)
26AQI (US)
26AQI (US)
23AQI (US)
24AQI (US)
35AQI (US)
36AQI (US)
29AQI (US)
27AQI (US)
27AQI (US)
31AQI (US)
27AQI (US)
24AQI (US)
26AQI (US)
24AQI (US)
47AQI (US)
51AQI (US)
58AQI (US)
57AQI (US)
56AQI (US)
52AQI (US)
40AQI (US)
48AQI (US)
49AQI (US)
46AQI (US)
43AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
31AQI (US)
31AQI (US)
29AQI (US)
26AQI (US)
27AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
27AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
25AQI (US)
24AQI (US)
22AQI (US)
25AQI (US)
25AQI (US)
25AQI (US)
25AQI (US)
28AQI (US)
30AQI (US)
28AQI (US)
25AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
25AQI (US)
25AQI (US)
28AQI (US)
30AQI (US)
27AQI (US)
29AQI (US)
32AQI (US)
30AQI (US)
29AQI (US)
30AQI (US)
30AQI (US)
28AQI (US)
29AQI (US)
47AQI (US)
51AQI (US)
41AQI (US)
47AQI (US)
54AQI (US)
60AQI (US)
56AQI (US)
52AQI (US)
53AQI (US)
55AQI (US)
51AQI (US)
54AQI (US)
52AQI (US)
59AQI (US)
51AQI (US)
52AQI (US)
51AQI (US)
56AQI (US)
71AQI (US)
71AQI (US)
70AQI (US)
65AQI (US)
52AQI (US)
68AQI (US)
59AQI (US)
53AQI (US)
56AQI (US)
59AQI (US)
44AQI (US)
62AQI (US)
51AQI (US)
48AQI (US)
44AQI (US)
46AQI (US)
49AQI (US)
61AQI (US)
62AQI (US)
43AQI (US)
49AQI (US)
48AQI (US)
61AQI (US)
63AQI (US)
60AQI (US)
44AQI (US)
56AQI (US)
60AQI (US)
56AQI (US)
49AQI (US)
54AQI (US)
38AQI (US)
36AQI (US)
49AQI (US)
36AQI (US)
36AQI (US)
46AQI (US)
45AQI (US)
51AQI (US)
51AQI (US)
36AQI (US)
27AQI (US)
41AQI (US)
43AQI (US)
42AQI (US)
46AQI (US)
45AQI (US)
46AQI (US)
47AQI (US)
56AQI (US)
45AQI (US)
59AQI (US)
40AQI (US)
30AQI (US)
35AQI (US)
49AQI (US)
47AQI (US)
41AQI (US)
43AQI (US)
37AQI (US)
29AQI (US)
36AQI (US)
26AQI (US)
40AQI (US)
56AQI (US)
44AQI (US)
No. of days
202639AQI (US)
Highest AQI (US) recorded in
August56AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202529AQI (US)
Highest AQI (US) recorded in
January45AQI (US)
Lowest AQI (US) recorded in
May18AQI (US)
202424AQI (US)
Highest AQI (US) recorded in
December35AQI (US)
Lowest AQI (US) recorded in
May16AQI (US)
202325AQI (US)
Highest AQI (US) recorded in
November42AQI (US)
Lowest AQI (US) recorded in
April11AQI (US)
202228AQI (US)
Highest AQI (US) recorded in
October50AQI (US)
Lowest AQI (US) recorded in
July16AQI (US)
202124AQI (US)
Highest AQI (US) recorded in
November31AQI (US)
Lowest AQI (US) recorded in
February18AQI (US)
202041AQI (US)
Highest AQI (US) recorded in
September140AQI (US)
Lowest AQI (US) recorded in
June20AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Eugene's annual 2026 AQI (US) (39) shows an average percentage change of 41.6% (worsened AQI (US)) compared to previous years: 2020 (41), 2021 (24), 2022 (28), 2023 (25), 2024 (24), 2025 (29).