Hill St, Pullman, 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
Hill St, Pullman, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (19th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 38 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Hill St, Pullman, Washington, United States
6 AM20th Sep 2025
7 PM
5 AM21st Sep 2025
54AQI
52AQI
52AQI
45AQI
In the last 24 hours,
Hill St's AQI reached its highest point of 54 at 9 AM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 20th Sep and 21st Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hill St, Pullman, Washington, United States
25°C12/36°C
27°C13/38°C
28°C16/38°C
29°C19/39°C
29°C22/39°C
25°C22/31°C
24°C18/32°C
26°C16/35°C
26°C17/36°C
28°C18/38°C
27°C18/37°C
28°C18/38°C
29°C19/39°C
29°C20/37°C
28°C17/37°C
23°C16/34°C
24°C16/32°C
23°C15/31°C
24°C16/31°C
23°C16/30°C
22°C17/29°C
21°C15/28°C
22°C14/31°C
18°C15/22°C
15°C13/20°C
20°C10/30°C
22°C13/32°C
23°C14/31°C
24°C15/32°C
24°C17/31°C
--°C/°C
60AQI
53AQI
54AQI
54AQI
2025 Days Vs Air Quality
Hill St, Pullman, Washington, United States
92%
242
7%
18
0.7%
2
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 264 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
Hill St, Pullman, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI
23AQI
19AQI
18AQI
22AQI
23AQI
18AQI
24AQI
22AQI
28AQI
21AQI
19AQI
25AQI
21AQI
35AQI
31AQI
32AQI
22AQI
22AQI
20AQI
26AQI
43AQI
37AQI
42AQI
25AQI
30AQI
31AQI
33AQI
36AQI
37AQI
30AQI
15AQI
18AQI
19AQI
24AQI
20AQI
27AQI
24AQI
25AQI
43AQI
26AQI
26AQI
32AQI
21AQI
33AQI
30AQI
30AQI
32AQI
35AQI
22AQI
28AQI
21AQI
20AQI
19AQI
18AQI
22AQI
19AQI
18AQI
19AQI
20AQI
24AQI
18AQI
18AQI
16AQI
15AQI
16AQI
17AQI
17AQI
16AQI
16AQI
16AQI
16AQI
15AQI
14AQI
14AQI
14AQI
14AQI
15AQI
15AQI
15AQI
15AQI
15AQI
14AQI
20AQI
19AQI
16AQI
16AQI
14AQI
15AQI
16AQI
16AQI
16AQI
15AQI
16AQI
15AQI
18AQI
19AQI
13AQI
12AQI
15AQI
15AQI
15AQI
16AQI
20AQI
24AQI
21AQI
18AQI
17AQI
15AQI
17AQI
13AQI
13AQI
17AQI
26AQI
20AQI
25AQI
29AQI
18AQI
14AQI
16AQI
17AQI
20AQI
15AQI
13AQI
13AQI
14AQI
14AQI
14AQI
16AQI
19AQI
17AQI
15AQI
13AQI
14AQI
15AQI
13AQI
12AQI
12AQI
12AQI
11AQI
11AQI
14AQI
16AQI
15AQI
17AQI
17AQI
13AQI
14AQI
15AQI
14AQI
19AQI
25AQI
13AQI
14AQI
15AQI
17AQI
18AQI
18AQI
19AQI
21AQI
22AQI
26AQI
37AQI
20AQI
18AQI
18AQI
19AQI
21AQI
16AQI
16AQI
17AQI
12AQI
12AQI
22AQI
37AQI
33AQI
18AQI
14AQI
12AQI
15AQI
16AQI
19AQI
22AQI
18AQI
17AQI
18AQI
17AQI
19AQI
20AQI
18AQI
15AQI
18AQI
20AQI
18AQI
17AQI
18AQI
31AQI
38AQI
25AQI
29AQI
37AQI
27AQI
35AQI
32AQI
28AQI
19AQI
16AQI
15AQI
16AQI
23AQI
21AQI
28AQI
40AQI
48AQI
40AQI
26AQI
34AQI
28AQI
17AQI
16AQI
17AQI
20AQI
32AQI
24AQI
39AQI
35AQI
25AQI
15AQI
16AQI
19AQI
21AQI
23AQI
21AQI
28AQI
54AQI
53AQI
49AQI
52AQI
56AQI
57AQI
54AQI
55AQI
61AQI
58AQI
61AQI
69AQI
72AQI
111AQI
122AQI
72AQI
52AQI
47AQI
54AQI
56AQI
52AQI
57AQI
42AQI
24AQI
32AQI
32AQI
32AQI
38AQI
27AQI
25AQI
16AQI
17AQI
15AQI
19AQI
22AQI
35AQI
57AQI
No. of days
202525AQI
Highest AQI recorded in
September57AQI
Lowest AQI recorded in
May15AQI
202422AQI
Highest AQI recorded in
July37AQI
Lowest AQI recorded in
March9AQI
202321AQI
Highest AQI recorded in
August52AQI
Lowest AQI recorded in
April12AQI
202221AQI
Highest AQI recorded in
September52AQI
Lowest AQI recorded in
March9AQI
202122AQI
Highest AQI recorded in
August64AQI
Lowest AQI recorded in
May11AQI
202023AQI
Highest AQI recorded in
September68AQI
Lowest AQI recorded in
May10AQI
Most & Least Polluted Years Over the Last 6 Years
Hill St's annual 2025 AQI (25) shows an average percentage change of 13.8% (worsened AQI) compared to previous years: 2020 (23), 2021 (22), 2022 (21), 2023 (21), 2024 (22).