Southwest Washington, Washington, District of Columbia, 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
Southwest Washington, Washington, District of Columbia, United States
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 20 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Southwest Washington, Washington, District of Columbia, United States
6 AM4th Oct 2025
7 PM
5 AM5th Oct 2025
48AQI
11AQI
56AQI
9AQI
In the last 24 hours,
Southwest Washington's AQI reached its highest point of 56 at 11 PM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Southwest Washington, Washington, District of Columbia, United States
25°C17/34°C
27°C23/35°C
21°C16/25°C
19°C12/25°C
19°C12/26°C
18°C15/21°C
22°C17/27°C
22°C15/30°C
22°C13/31°C
23°C15/32°C
22°C16/27°C
20°C17/24°C
18°C15/20°C
23°C18/31°C
25°C17/34°C
21°C18/23°C
22°C18/25°C
22°C16/28°C
24°C17/34°C
25°C18/33°C
25°C22/31°C
25°C20/31°C
22°C19/29°C
24°C19/31°C
23°C17/31°C
23°C19/30°C
20°C15/26°C
17°C10/23°C
17°C9/26°C
19°C9/29°C
--°C/°C
32AQI
29AQI
33AQI
28AQI
2025 Days Vs Air Quality
Southwest Washington, Washington, District of Columbia, United States
89%
171
11%
21
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 278 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
Southwest Washington, Washington, District of Columbia, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
35AQI
56AQI
37AQI
28AQI
19AQI
23AQI
36AQI
32AQI
40AQI
40AQI
19AQI
20AQI
18AQI
22AQI
23AQI
18AQI
19AQI
34AQI
36AQI
14AQI
20AQI
37AQI
52AQI
42AQI
31AQI
40AQI
28AQI
46AQI
34AQI
38AQI
12AQI
20AQI
33AQI
35AQI
40AQI
45AQI
40AQI
22AQI
24AQI
22AQI
20AQI
34AQI
23AQI
23AQI
32AQI
37AQI
23AQI
30AQI
35AQI
50AQI
30AQI
19AQI
22AQI
21AQI
18AQI
14AQI
13AQI
13AQI
17AQI
21AQI
27AQI
17AQI
20AQI
32AQI
30AQI
21AQI
26AQI
32AQI
47AQI
53AQI
50AQI
35AQI
46AQI
41AQI
41AQI
55AQI
62AQI
64AQI
44AQI
40AQI
21AQI
26AQI
42AQI
31AQI
25AQI
41AQI
46AQI
54AQI
57AQI
57AQI
49AQI
32AQI
30AQI
42AQI
41AQI
47AQI
30AQI
43AQI
52AQI
86AQI
51AQI
37AQI
44AQI
33AQI
31AQI
38AQI
44AQI
33AQI
31AQI
29AQI
34AQI
32AQI
30AQI
34AQI
25AQI
30AQI
53AQI
51AQI
38AQI
49AQI
43AQI
46AQI
34AQI
52AQI
54AQI
46AQI
27AQI
38AQI
46AQI
56AQI
65AQI
68AQI
65AQI
44AQI
31AQI
34AQI
32AQI
25AQI
29AQI
26AQI
43AQI
47AQI
46AQI
31AQI
18AQI
24AQI
19AQI
22AQI
29AQI
27AQI
24AQI
20AQI
19AQI
30AQI
29AQI
21AQI
30AQI
29AQI
22AQI
30AQI
29AQI
35AQI
53AQI
30AQI
21AQI
27AQI
22AQI
20AQI
31AQI
38AQI
45AQI
46AQI
33AQI
23AQI
22AQI
38AQI
36AQI
29AQI
24AQI
35AQI
49AQI
37AQI
21AQI
23AQI
24AQI
25AQI
23AQI
25AQI
27AQI
14AQI
20AQI
35AQI
29AQI
26AQI
42AQI
41AQI
34AQI
31AQI
22AQI
No. of days
202534AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
October22AQI
Most & Least Polluted Years Over the Last 1 Years
Southwest Washington's annual 2025 AQI (34) shows an average percentage change of NaN% (improved AQI) compared to previous years: .