Gregory Street, Normal, Illinois, 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
Gregory Street, Normal, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (19th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 21 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 19th Oct - 20th Oct 2025
Gregory Street, Normal, Illinois, United States
6 AM19th Oct 2025
6 PM
5 AM20th Oct 2025
26AQI
16AQI
39AQI
16AQI
In the last 24 hours,
Gregory Street's AQI reached its highest point of 39 at 6 AM during the Night, while the lowest point, 16, was recorded at 8 PM during the Night between 19th Oct and 20th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Gregory Street, Normal, Illinois, United States
23°C18/31°C
23°C17/29°C
22°C17/28°C
23°C17/31°C
21°C18/25°C
19°C12/26°C
20°C11/30°C
22°C13/32°C
23°C14/33°C
24°C14/34°C
24°C16/32°C
22°C14/31°C
23°C15/32°C
24°C17/32°C
24°C17/32°C
23°C16/31°C
23°C18/30°C
17°C12/19°C
14°C7/22°C
14°C6/23°C
16°C8/24°C
18°C13/25°C
17°C7/26°C
19°C12/27°C
20°C13/28°C
19°C13/28°C
19°C14/27°C
20°C14/28°C
21°C14/29°C
12°C8/16°C
--°C/°C
42AQI
40AQI
44AQI
38AQI
2025 Days Vs Air Quality
Gregory Street, Normal, Illinois, United States
74%
154
25%
52
0.4%
1
Total number of days with different AQI categories in last 293 days in 2025 (72 days remaining)
Under WHO’s Safe Air Quality Limits: 74%
Health Risk Level:
Low
In 2025, 74% of 293 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
Gregory Street, Normal, Illinois, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
37AQI
40AQI
27AQI
17AQI
27AQI
30AQI
24AQI
37AQI
25AQI
21AQI
26AQI
19AQI
24AQI
42AQI
43AQI
41AQI
35AQI
31AQI
21AQI
24AQI
38AQI
53AQI
49AQI
41AQI
19AQI
26AQI
25AQI
31AQI
47AQI
22AQI
20AQI
33AQI
31AQI
23AQI
25AQI
21AQI
23AQI
19AQI
25AQI
32AQI
25AQI
27AQI
25AQI
32AQI
26AQI
30AQI
25AQI
27AQI
48AQI
33AQI
22AQI
19AQI
20AQI
25AQI
16AQI
16AQI
21AQI
20AQI
20AQI
21AQI
22AQI
27AQI
37AQI
33AQI
46AQI
36AQI
43AQI
57AQI
37AQI
56AQI
64AQI
70AQI
63AQI
63AQI
56AQI
66AQI
79AQI
72AQI
62AQI
52AQI
47AQI
31AQI
31AQI
25AQI
32AQI
37AQI
43AQI
56AQI
51AQI
37AQI
44AQI
33AQI
23AQI
33AQI
27AQI
29AQI
46AQI
49AQI
54AQI
72AQI
55AQI
51AQI
66AQI
41AQI
39AQI
40AQI
32AQI
50AQI
51AQI
51AQI
32AQI
24AQI
23AQI
28AQI
26AQI
39AQI
50AQI
58AQI
52AQI
33AQI
29AQI
24AQI
27AQI
29AQI
32AQI
61AQI
116AQI
87AQI
60AQI
51AQI
54AQI
55AQI
45AQI
51AQI
52AQI
42AQI
45AQI
41AQI
47AQI
57AQI
58AQI
51AQI
42AQI
45AQI
30AQI
22AQI
20AQI
28AQI
32AQI
25AQI
20AQI
25AQI
30AQI
33AQI
30AQI
27AQI
30AQI
30AQI
31AQI
41AQI
62AQI
47AQI
23AQI
28AQI
24AQI
28AQI
41AQI
51AQI
52AQI
57AQI
57AQI
53AQI
51AQI
53AQI
54AQI
55AQI
54AQI
44AQI
34AQI
34AQI
33AQI
24AQI
35AQI
39AQI
43AQI
35AQI
30AQI
45AQI
49AQI
52AQI
61AQI
51AQI
43AQI
24AQI
27AQI
28AQI
36AQI
44AQI
31AQI
49AQI
58AQI
51AQI
50AQI
43AQI
56AQI
21AQI
31AQI
31AQI
26AQI
48AQI
42AQI
44AQI
41AQI
43AQI
No. of days
202539AQI
Highest AQI recorded in
June48AQI
Lowest AQI recorded in
May26AQI
Most & Least Polluted Years Over the Last 1 Years
Gregory Street's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .