Granite City, Illinois, 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 City, Illinois, 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 56 of Moderate air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Granite City, Illinois, United States
6 AM28th Sep 2025
7 PM
5 AM29th Sep 2025
68AQI
37AQI
62AQI
39AQI
In the last 24 hours,
Granite City's AQI reached its highest point of 68 at 10 AM during the Day, while the lowest point, 37, was recorded at 4 PM during the Day between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Granite City, Illinois, United States
24°C16/32°C
23°C17/29°C
22°C14/31°C
24°C17/31°C
25°C17/33°C
21°C16/26°C
21°C18/27°C
21°C15/28°C
19°C13/26°C
18°C9/25°C
20°C10/30°C
26°C18/34°C
27°C17/35°C
27°C18/36°C
29°C20/38°C
31°C23/39°C
29°C22/36°C
28°C21/36°C
27°C18/35°C
27°C17/37°C
26°C21/32°C
25°C21/30°C
25°C18/35°C
22°C19/28°C
22°C18/30°C
21°C19/24°C
21°C16/28°C
21°C13/30°C
21°C12/33°C
23°C12/34°C
--°C/°C
50AQI
45AQI
47AQI
44AQI
2025 Days Vs Air Quality
Granite City, Illinois, United States
78%
211
21%
58
0.7%
2
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 78%
Health Risk Level:
Low
In 2025, 78% of 272 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
Granite City, Illinois, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI
38AQI
26AQI
21AQI
21AQI
19AQI
27AQI
38AQI
56AQI
57AQI
36AQI
31AQI
23AQI
29AQI
39AQI
35AQI
33AQI
21AQI
18AQI
21AQI
22AQI
26AQI
29AQI
33AQI
40AQI
30AQI
28AQI
24AQI
26AQI
36AQI
22AQI
39AQI
29AQI
36AQI
27AQI
28AQI
28AQI
30AQI
30AQI
34AQI
28AQI
33AQI
55AQI
31AQI
30AQI
31AQI
37AQI
21AQI
22AQI
21AQI
23AQI
39AQI
45AQI
36AQI
38AQI
36AQI
32AQI
27AQI
25AQI
23AQI
30AQI
35AQI
47AQI
24AQI
25AQI
24AQI
32AQI
46AQI
46AQI
51AQI
51AQI
66AQI
57AQI
127AQI
27AQI
47AQI
35AQI
40AQI
26AQI
38AQI
23AQI
27AQI
21AQI
27AQI
37AQI
51AQI
40AQI
44AQI
28AQI
20AQI
35AQI
41AQI
31AQI
25AQI
25AQI
22AQI
33AQI
24AQI
31AQI
42AQI
41AQI
58AQI
44AQI
41AQI
24AQI
40AQI
51AQI
58AQI
49AQI
53AQI
24AQI
38AQI
38AQI
44AQI
41AQI
27AQI
28AQI
41AQI
36AQI
31AQI
29AQI
30AQI
28AQI
19AQI
20AQI
35AQI
27AQI
31AQI
27AQI
39AQI
36AQI
34AQI
28AQI
40AQI
57AQI
46AQI
31AQI
28AQI
35AQI
30AQI
19AQI
17AQI
23AQI
30AQI
35AQI
22AQI
24AQI
27AQI
50AQI
32AQI
44AQI
42AQI
49AQI
63AQI
50AQI
43AQI
53AQI
81AQI
57AQI
61AQI
63AQI
78AQI
81AQI
49AQI
37AQI
47AQI
32AQI
38AQI
36AQI
24AQI
43AQI
52AQI
54AQI
59AQI
54AQI
52AQI
52AQI
38AQI
28AQI
26AQI
29AQI
30AQI
47AQI
56AQI
66AQI
83AQI
61AQI
43AQI
53AQI
38AQI
45AQI
49AQI
36AQI
35AQI
30AQI
37AQI
37AQI
32AQI
31AQI
50AQI
54AQI
29AQI
44AQI
57AQI
58AQI
47AQI
48AQI
28AQI
40AQI
49AQI
46AQI
42AQI
109AQI
81AQI
46AQI
39AQI
32AQI
50AQI
56AQI
55AQI
52AQI
47AQI
45AQI
47AQI
44AQI
62AQI
58AQI
57AQI
58AQI
61AQI
53AQI
26AQI
22AQI
31AQI
44AQI
26AQI
26AQI
31AQI
39AQI
46AQI
49AQI
40AQI
32AQI
29AQI
29AQI
45AQI
55AQI
56AQI
33AQI
28AQI
30AQI
41AQI
53AQI
61AQI
61AQI
60AQI
58AQI
57AQI
59AQI
55AQI
64AQI
49AQI
52AQI
47AQI
41AQI
46AQI
33AQI
26AQI
39AQI
47AQI
56AQI
30AQI
32AQI
39AQI
37AQI
31AQI
49AQI
45AQI
47AQI
47AQI
No. of days
202540AQI
Highest AQI recorded in
June49AQI
Lowest AQI recorded in
January30AQI
202436AQI
Highest AQI recorded in
February45AQI
Lowest AQI recorded in
November26AQI
202343AQI
Highest AQI recorded in
June56AQI
Lowest AQI recorded in
December40AQI
202238AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
September32AQI
202146AQI
Highest AQI recorded in
July55AQI
Lowest AQI recorded in
November39AQI
202039AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
May28AQI
Most & Least Polluted Years Over the Last 6 Years
Granite City's annual 2025 AQI (40) shows an average percentage change of -0.7% (improved AQI) compared to previous years: 2020 (39), 2021 (46), 2022 (38), 2023 (43), 2024 (36).