South 1st Street, Rockford, 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
South 1st Street, Rockford, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (30th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 36 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Oct - 31st Oct 2025
South 1st Street, Rockford, Illinois, United States
7 AM30th Oct 2025
6 PM
6 AM31st Oct 2025
48AQI
18AQI
66AQI
33AQI
In the last 24 hours,
South 1st Street's AQI reached its highest point of 66 at 5 AM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Night between 30th Oct and 31st Oct 2025.
Day & Night AQI Trend : Oct 2025
South 1st Street, Rockford, Illinois, United States
21°C15/30°C
22°C14/32°C
24°C14/34°C
24°C15/33°C
23°C16/31°C
21°C16/29°C
16°C11/22°C
12°C6/20°C
12°C5/19°C
13°C8/20°C
14°C6/22°C
14°C7/24°C
18°C13/25°C
15°C9/22°C
14°C12/16°C
16°C12/22°C
20°C14/29°C
20°C16/25°C
12°C6/18°C
12°C3/22°C
9°C6/11°C
7°C4/9°C
7°C2/14°C
6°C-1/14°C
7°C0/14°C
11°C5/19°C
10°C4/18°C
10°C5/14°C
11°C5/17°C
7°C5/9°C
--°C/°C
34AQI
32AQI
40AQI
33AQI
2025 Days Vs Air Quality
South 1st Street, Rockford, Illinois, United States
77%
167
22%
47
2%
4
Total number of days with different AQI categories in last 304 days in 2025 (61 days remaining)
Under WHO’s Safe Air Quality Limits: 77%
Health Risk Level:
Low
In 2025, 77% of 304 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
South 1st Street, Rockford, Illinois, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
41AQI
28AQI
28AQI
16AQI
21AQI
29AQI
20AQI
23AQI
22AQI
23AQI
26AQI
19AQI
36AQI
47AQI
50AQI
49AQI
36AQI
28AQI
19AQI
22AQI
35AQI
49AQI
29AQI
38AQI
16AQI
31AQI
28AQI
37AQI
23AQI
17AQI
25AQI
35AQI
28AQI
20AQI
21AQI
25AQI
14AQI
21AQI
19AQI
34AQI
36AQI
15AQI
21AQI
37AQI
22AQI
33AQI
36AQI
34AQI
47AQI
29AQI
17AQI
18AQI
15AQI
21AQI
14AQI
14AQI
17AQI
20AQI
16AQI
22AQI
20AQI
26AQI
29AQI
38AQI
37AQI
39AQI
41AQI
54AQI
62AQI
81AQI
75AQI
75AQI
77AQI
71AQI
61AQI
75AQI
84AQI
66AQI
58AQI
54AQI
53AQI
37AQI
26AQI
28AQI
37AQI
39AQI
43AQI
55AQI
27AQI
29AQI
37AQI
22AQI
22AQI
35AQI
26AQI
30AQI
50AQI
47AQI
45AQI
62AQI
39AQI
54AQI
59AQI
45AQI
42AQI
27AQI
26AQI
58AQI
74AQI
70AQI
50AQI
23AQI
20AQI
27AQI
26AQI
76AQI
70AQI
63AQI
51AQI
28AQI
37AQI
32AQI
30AQI
41AQI
46AQI
145AQI
115AQI
100AQI
113AQI
107AQI
79AQI
89AQI
59AQI
56AQI
56AQI
48AQI
37AQI
34AQI
56AQI
59AQI
68AQI
50AQI
34AQI
27AQI
23AQI
24AQI
21AQI
28AQI
31AQI
20AQI
17AQI
24AQI
34AQI
31AQI
21AQI
23AQI
29AQI
37AQI
39AQI
47AQI
53AQI
38AQI
21AQI
25AQI
33AQI
28AQI
44AQI
50AQI
49AQI
58AQI
61AQI
54AQI
54AQI
54AQI
57AQI
53AQI
46AQI
34AQI
38AQI
37AQI
24AQI
29AQI
43AQI
39AQI
40AQI
31AQI
45AQI
38AQI
43AQI
63AQI
68AQI
58AQI
44AQI
21AQI
25AQI
29AQI
39AQI
26AQI
23AQI
45AQI
44AQI
18AQI
26AQI
43AQI
54AQI
26AQI
22AQI
25AQI
14AQI
9AQI
26AQI
59AQI
41AQI
29AQI
33AQI
30AQI
36AQI
29AQI
29AQI
25AQI
50AQI
48AQI
49AQI
42AQI
35AQI
No. of days
202539AQI
Highest AQI recorded in
June50AQI
Lowest AQI recorded in
May25AQI
Most & Least Polluted Years Over the Last 1 Years
South 1st Street's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .