Granite Falls, 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
Granite Falls, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (28th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 28 of Good air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Granite Falls, Washington, United States
6 AM28th Sep 2025
7 PM
5 AM29th Sep 2025
33AQI
19AQI
28AQI
17AQI
In the last 24 hours,
Granite Falls's AQI reached its highest point of 33 at 4 PM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Granite Falls, Washington, United States
21°C17/27°C
20°C12/28°C
18°C9/23°C
21°C12/30°C
24°C17/32°C
22°C15/30°C
22°C15/31°C
21°C14/28°C
18°C17/18°C
19°C16/22°C
16°C8/21°C
18°C9/22°C
17°C11/20°C
17°C15/18°C
17°C8/25°C
14°C10/17°C
15°C10/21°C
19°C10/29°C
19°C13/25°C
15°C8/21°C
17°C9/26°C
18°C10/25°C
16°C11/19°C
15°C9/23°C
20°C14/28°C
19°C13/25°C
14°C10/18°C
15°C11/22°C
18°C14/25°C
19°C14/26°C
--°C/°C
44AQI
40AQI
43AQI
40AQI
2025 Days Vs Air Quality
Granite Falls, Washington, United States
92%
249
8%
22
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 272 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
Granite Falls, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
56AQI
48AQI
39AQI
47AQI
35AQI
24AQI
41AQI
41AQI
29AQI
30AQI
26AQI
29AQI
40AQI
56AQI
50AQI
39AQI
38AQI
44AQI
38AQI
47AQI
58AQI
55AQI
64AQI
57AQI
29AQI
48AQI
52AQI
58AQI
61AQI
56AQI
50AQI
25AQI
36AQI
32AQI
35AQI
36AQI
33AQI
46AQI
46AQI
56AQI
29AQI
31AQI
35AQI
38AQI
31AQI
32AQI
37AQI
32AQI
31AQI
28AQI
19AQI
21AQI
22AQI
18AQI
19AQI
18AQI
22AQI
31AQI
34AQI
31AQI
39AQI
25AQI
22AQI
20AQI
22AQI
34AQI
26AQI
23AQI
19AQI
19AQI
20AQI
18AQI
24AQI
19AQI
17AQI
17AQI
17AQI
22AQI
15AQI
16AQI
16AQI
18AQI
22AQI
26AQI
23AQI
17AQI
16AQI
16AQI
17AQI
20AQI
18AQI
17AQI
22AQI
19AQI
22AQI
19AQI
16AQI
15AQI
14AQI
16AQI
18AQI
17AQI
17AQI
20AQI
21AQI
29AQI
19AQI
21AQI
23AQI
20AQI
18AQI
14AQI
18AQI
23AQI
20AQI
36AQI
38AQI
29AQI
18AQI
16AQI
19AQI
21AQI
14AQI
14AQI
14AQI
15AQI
19AQI
16AQI
18AQI
22AQI
19AQI
16AQI
16AQI
19AQI
19AQI
14AQI
14AQI
13AQI
14AQI
11AQI
12AQI
15AQI
16AQI
18AQI
22AQI
15AQI
15AQI
18AQI
17AQI
16AQI
19AQI
15AQI
15AQI
17AQI
20AQI
26AQI
23AQI
21AQI
22AQI
26AQI
27AQI
35AQI
40AQI
29AQI
26AQI
25AQI
26AQI
23AQI
18AQI
16AQI
19AQI
21AQI
22AQI
22AQI
38AQI
37AQI
20AQI
15AQI
15AQI
21AQI
22AQI
22AQI
17AQI
17AQI
18AQI
31AQI
25AQI
21AQI
23AQI
18AQI
16AQI
19AQI
19AQI
21AQI
19AQI
20AQI
26AQI
31AQI
35AQI
31AQI
30AQI
30AQI
27AQI
28AQI
28AQI
24AQI
21AQI
31AQI
26AQI
27AQI
32AQI
25AQI
23AQI
25AQI
31AQI
43AQI
47AQI
29AQI
18AQI
20AQI
22AQI
30AQI
28AQI
28AQI
28AQI
24AQI
24AQI
13AQI
16AQI
21AQI
22AQI
21AQI
23AQI
27AQI
30AQI
43AQI
53AQI
54AQI
56AQI
51AQI
52AQI
48AQI
44AQI
49AQI
49AQI
58AQI
60AQI
68AQI
69AQI
44AQI
31AQI
41AQI
49AQI
40AQI
35AQI
33AQI
27AQI
19AQI
30AQI
42AQI
29AQI
31AQI
44AQI
37AQI
23AQI
45AQI
52AQI
37AQI
46AQI
63AQI
28AQI
45AQI
31AQI
21AQI
20AQI
16AQI
23AQI
24AQI
32AQI
42AQI
No. of days
202528AQI
Highest AQI recorded in
January45AQI
Lowest AQI recorded in
May16AQI
202420AQI
Highest AQI recorded in
January32AQI
Lowest AQI recorded in
June11AQI
202319AQI
Highest AQI recorded in
November36AQI
Lowest AQI recorded in
April10AQI
202237AQI
Highest AQI recorded in
October94AQI
Lowest AQI recorded in
June13AQI
202123AQI
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
September13AQI
202026AQI
Highest AQI recorded in
September62AQI
Lowest AQI recorded in
June12AQI
Most & Least Polluted Years Over the Last 6 Years
Granite Falls's annual 2025 AQI (28) shows an average percentage change of 18.009% (worsened AQI) compared to previous years: 2020 (26), 2021 (23), 2022 (37), 2023 (19), 2024 (20).