Klamath Falls, 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
Klamath Falls, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (26th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 30 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 26th Sep - 27th Sep 2025
Klamath Falls, Oregon, United States
6 AM26th Sep 2025
7 PM
5 AM27th Sep 2025
38AQI
22AQI
39AQI
11AQI
In the last 24 hours,
Klamath Falls's AQI reached its highest point of 39 at 7 PM during the Night, while the lowest point, 11, was recorded at 5 AM during the Night between 26th Sep and 27th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Klamath Falls, Oregon, United States
--°C/°C
21°C10/30°C
21°C11/31°C
21°C10/31°C
21°C9/31°C
22°C12/34°C
21°C13/31°C
22°C13/32°C
22°C12/31°C
19°C11/28°C
17°C7/26°C
16°C8/25°C
13°C10/18°C
12°C9/17°C
13°C6/18°C
16°C9/23°C
17°C8/27°C
15°C8/21°C
16°C5/26°C
18°C7/29°C
19°C9/29°C
19°C10/30°C
20°C13/28°C
20°C14/28°C
17°C11/25°C
15°C7/25°C
19°C9/29°C
20°C8/30°C
18°C6/28°C
17°C8/26°C
17°C8/27°C
40AQI
33AQI
34AQI
30AQI
2025 Days Vs Air Quality
Klamath Falls, Oregon, United States
98%
181
2%
4
Total number of days with different AQI categories in last 271 days in 2025 (94 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 271 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
Klamath Falls, Oregon, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
20AQI
31AQI
25AQI
26AQI
23AQI
22AQI
22AQI
30AQI
23AQI
42AQI
48AQI
17AQI
21AQI
36AQI
36AQI
27AQI
26AQI
28AQI
28AQI
38AQI
37AQI
22AQI
22AQI
34AQI
33AQI
20AQI
32AQI
19AQI
33AQI
33AQI
19AQI
23AQI
23AQI
20AQI
22AQI
31AQI
32AQI
17AQI
17AQI
17AQI
15AQI
25AQI
17AQI
28AQI
28AQI
17AQI
19AQI
25AQI
21AQI
23AQI
20AQI
17AQI
18AQI
19AQI
18AQI
21AQI
18AQI
23AQI
22AQI
26AQI
19AQI
20AQI
27AQI
21AQI
29AQI
30AQI
17AQI
17AQI
18AQI
19AQI
20AQI
23AQI
34AQI
32AQI
29AQI
33AQI
37AQI
31AQI
27AQI
26AQI
27AQI
26AQI
21AQI
21AQI
24AQI
27AQI
40AQI
39AQI
33AQI
29AQI
36AQI
31AQI
25AQI
24AQI
23AQI
26AQI
31AQI
30AQI
25AQI
24AQI
39AQI
29AQI
25AQI
29AQI
44AQI
34AQI
30AQI
28AQI
33AQI
27AQI
39AQI
45AQI
61AQI
50AQI
31AQI
23AQI
22AQI
21AQI
23AQI
33AQI
26AQI
24AQI
20AQI
21AQI
21AQI
21AQI
30AQI
32AQI
34AQI
28AQI
31AQI
28AQI
26AQI
24AQI
22AQI
20AQI
22AQI
26AQI
38AQI
36AQI
36AQI
28AQI
33AQI
27AQI
22AQI
23AQI
26AQI
26AQI
34AQI
44AQI
49AQI
34AQI
55AQI
50AQI
38AQI
38AQI
49AQI
53AQI
47AQI
41AQI
38AQI
35AQI
47AQI
47AQI
53AQI
46AQI
24AQI
24AQI
31AQI
44AQI
48AQI
35AQI
19AQI
19AQI
31AQI
31AQI
31AQI
31AQI
21AQI
16AQI
17AQI
23AQI
41AQI
30AQI
24AQI
28AQI
22AQI
27AQI
30AQI
33AQI
33AQI
No. of days
202529AQI
Highest AQI recorded in
September33AQI
Lowest AQI recorded in
May22AQI
Most & Least Polluted Years Over the Last 1 Years
Klamath Falls's annual 2025 AQI (29) shows an average percentage change of NaN% (improved AQI) compared to previous years: .