Leavenworth, Washington, 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
Leavenworth, Washington, 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 32 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Sep - 26th Sep 2025
Leavenworth, Washington, United States
6 AM25th Sep 2025
7 PM
5 AM26th Sep 2025
99AQI
33AQI
45AQI
29AQI
In the last 24 hours,
Leavenworth's AQI reached its highest point of 99 at 6 AM during the Day, while the lowest point, 29, was recorded at 8 PM during the Night between 25th Sep and 26th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Leavenworth, Washington, United States
--°C/°C
23°C17/28°C
23°C19/30°C
23°C17/32°C
25°C20/32°C
24°C16/31°C
27°C18/35°C
29°C22/37°C
28°C23/36°C
26°C19/33°C
24°C19/31°C
18°C12/24°C
18°C10/26°C
17°C12/24°C
18°C10/28°C
18°C11/29°C
17°C10/28°C
18°C11/28°C
14°C9/19°C
14°C7/24°C
16°C8/25°C
19°C11/28°C
17°C11/26°C
19°C11/29°C
19°C13/29°C
16°C5/21°C
16°C9/24°C
17°C9/26°C
19°C12/29°C
18°C13/24°C
17°C11/25°C
51AQI
51AQI
54AQI
51AQI
2025 Days Vs Air Quality
Leavenworth, Washington, United States
89%
164
10%
18
2%
3
Total number of days with different AQI categories in last 270 days in 2025 (95 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 270 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
Leavenworth, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
16AQI
16AQI
15AQI
18AQI
18AQI
21AQI
16AQI
23AQI
17AQI
25AQI
28AQI
19AQI
13AQI
14AQI
16AQI
14AQI
15AQI
19AQI
24AQI
23AQI
20AQI
19AQI
20AQI
21AQI
15AQI
13AQI
13AQI
18AQI
30AQI
30AQI
30AQI
27AQI
18AQI
13AQI
16AQI
17AQI
19AQI
15AQI
13AQI
14AQI
16AQI
17AQI
13AQI
16AQI
21AQI
14AQI
13AQI
13AQI
14AQI
15AQI
12AQI
12AQI
12AQI
16AQI
10AQI
12AQI
15AQI
15AQI
17AQI
21AQI
15AQI
14AQI
20AQI
17AQI
13AQI
19AQI
11AQI
13AQI
15AQI
15AQI
18AQI
17AQI
17AQI
22AQI
24AQI
25AQI
25AQI
27AQI
19AQI
16AQI
18AQI
21AQI
21AQI
15AQI
16AQI
15AQI
11AQI
14AQI
36AQI
52AQI
43AQI
16AQI
13AQI
12AQI
15AQI
18AQI
23AQI
17AQI
16AQI
16AQI
18AQI
18AQI
19AQI
22AQI
17AQI
15AQI
17AQI
18AQI
18AQI
16AQI
18AQI
23AQI
28AQI
28AQI
23AQI
21AQI
24AQI
23AQI
27AQI
30AQI
18AQI
19AQI
20AQI
19AQI
18AQI
19AQI
19AQI
25AQI
23AQI
22AQI
23AQI
23AQI
19AQI
15AQI
15AQI
15AQI
17AQI
20AQI
20AQI
22AQI
17AQI
17AQI
12AQI
14AQI
15AQI
17AQI
17AQI
16AQI
24AQI
22AQI
22AQI
26AQI
33AQI
33AQI
38AQI
54AQI
51AQI
47AQI
57AQI
62AQI
68AQI
73AQI
109AQI
118AQI
89AQI
55AQI
53AQI
54AQI
61AQI
59AQI
58AQI
48AQI
26AQI
34AQI
42AQI
39AQI
53AQI
54AQI
46AQI
26AQI
53AQI
57AQI
109AQI
32AQI
17AQI
20AQI
15AQI
20AQI
20AQI
24AQI
59AQI
No. of days
202525AQI
Highest AQI recorded in
September59AQI
Lowest AQI recorded in
May15AQI
Most & Least Polluted Years Over the Last 1 Years
Leavenworth's annual 2025 AQI (25) shows an average percentage change of NaN% (improved AQI) compared to previous years: .