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!
August Air Quality Analysis
Rockford, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (9th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 43 of Good air quality, showing improvement over 2025 and 2023 on the same day.
Day & Night AQI Trend: 8th Aug - 9th Aug 2026
Rockford, Illinois, United States
5 AM8th Aug 2026
8 PM
4 AM9th Aug 2026
50AQI
28AQI
59AQI
27AQI
In the last 24 hours,
Rockford's AQI reached its highest point of 59 at 10 PM during the Night, while the lowest point, 27, was recorded at 12 AM during the Night between 8th Aug and 9th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Rockford, Illinois, United States
24°C16/32°C
25°C16/35°C
27°C19/38°C
29°C19/40°C
29°C21/39°C
29°C21/39°C
29°C21/38°C
28°C24/35°C
24°C18/33°C
23°C16/31°C
25°C20/32°C
20°C13/26°C
20°C12/29°C
21°C14/30°C
21°C15/31°C
28°C22/37°C
31°C24/40°C
25°C21/31°C
24°C15/33°C
24°C14/34°C
21°C18/29°C
20°C18/23°C
21°C17/29°C
22°C13/31°C
24°C16/31°C
23°C21/28°C
22°C17/30°C
24°C20/33°C
24°C18/33°C
23°C15/33°C
71AQI
52AQI
67AQI
58AQI
2026 Days Vs Air Quality
Rockford, Illinois, United States
78%
169
21%
45
0.9%
2
0.4%
1
0.4%
1
Total number of days with different AQI categories in last 221 days in 2026 (144 days remaining)
Under WHO’s Safe Air Quality Limits: 78%
Health Risk Level:
Low
In 2026, 78% of 221 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
Rockford, Illinois, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
11AQI (US)
22AQI (US)
22AQI (US)
41AQI (US)
70AQI (US)
89AQI (US)
54AQI (US)
44AQI (US)
24AQI (US)
35AQI (US)
22AQI (US)
22AQI (US)
23AQI (US)
12AQI (US)
13AQI (US)
17AQI (US)
16AQI (US)
15AQI (US)
17AQI (US)
25AQI (US)
34AQI (US)
50AQI (US)
55AQI (US)
43AQI (US)
44AQI (US)
39AQI (US)
34AQI (US)
38AQI (US)
47AQI (US)
56AQI (US)
38AQI (US)
37AQI (US)
48AQI (US)
41AQI (US)
34AQI (US)
56AQI (US)
50AQI (US)
36AQI (US)
46AQI (US)
67AQI (US)
52AQI (US)
32AQI (US)
34AQI (US)
72AQI (US)
76AQI (US)
64AQI (US)
47AQI (US)
70AQI (US)
52AQI (US)
31AQI (US)
39AQI (US)
33AQI (US)
37AQI (US)
36AQI (US)
42AQI (US)
36AQI (US)
40AQI (US)
50AQI (US)
33AQI (US)
34AQI (US)
40AQI (US)
55AQI (US)
80AQI (US)
85AQI (US)
62AQI (US)
37AQI (US)
41AQI (US)
36AQI (US)
35AQI (US)
40AQI (US)
38AQI (US)
39AQI (US)
36AQI (US)
30AQI (US)
37AQI (US)
34AQI (US)
45AQI (US)
79AQI (US)
57AQI (US)
68AQI (US)
38AQI (US)
40AQI (US)
37AQI (US)
47AQI (US)
50AQI (US)
29AQI (US)
30AQI (US)
37AQI (US)
54AQI (US)
45AQI (US)
32AQI (US)
28AQI (US)
32AQI (US)
32AQI (US)
30AQI (US)
32AQI (US)
26AQI (US)
29AQI (US)
33AQI (US)
41AQI (US)
62AQI (US)
51AQI (US)
38AQI (US)
34AQI (US)
30AQI (US)
35AQI (US)
29AQI (US)
33AQI (US)
28AQI (US)
27AQI (US)
35AQI (US)
23AQI (US)
30AQI (US)
43AQI (US)
48AQI (US)
25AQI (US)
27AQI (US)
33AQI (US)
35AQI (US)
29AQI (US)
27AQI (US)
35AQI (US)
33AQI (US)
24AQI (US)
23AQI (US)
32AQI (US)
30AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
20AQI (US)
25AQI (US)
30AQI (US)
63AQI (US)
42AQI (US)
40AQI (US)
50AQI (US)
42AQI (US)
35AQI (US)
34AQI (US)
48AQI (US)
42AQI (US)
28AQI (US)
21AQI (US)
16AQI (US)
21AQI (US)
28AQI (US)
29AQI (US)
27AQI (US)
20AQI (US)
21AQI (US)
27AQI (US)
52AQI (US)
31AQI (US)
37AQI (US)
48AQI (US)
33AQI (US)
33AQI (US)
29AQI (US)
25AQI (US)
18AQI (US)
22AQI (US)
24AQI (US)
25AQI (US)
29AQI (US)
26AQI (US)
21AQI (US)
24AQI (US)
28AQI (US)
31AQI (US)
21AQI (US)
32AQI (US)
20AQI (US)
28AQI (US)
48AQI (US)
57AQI (US)
61AQI (US)
56AQI (US)
54AQI (US)
35AQI (US)
38AQI (US)
58AQI (US)
66AQI (US)
58AQI (US)
53AQI (US)
58AQI (US)
47AQI (US)
50AQI (US)
55AQI (US)
56AQI (US)
56AQI (US)
50AQI (US)
60AQI (US)
220AQI (US)
196AQI (US)
59AQI (US)
149AQI (US)
116AQI (US)
49AQI (US)
30AQI (US)
33AQI (US)
39AQI (US)
49AQI (US)
57AQI (US)
56AQI (US)
51AQI (US)
29AQI (US)
35AQI (US)
44AQI (US)
52AQI (US)
48AQI (US)
39AQI (US)
48AQI (US)
53AQI (US)
56AQI (US)
50AQI (US)
44AQI (US)
43AQI (US)
35AQI (US)
46AQI (US)
46AQI (US)
34AQI (US)
32AQI (US)
32AQI (US)
65AQI (US)
48AQI (US)
No. of days
202642AQI (US)
Highest AQI (US) recorded in
July65AQI (US)
Lowest AQI (US) recorded in
June32AQI (US)
202537AQI (US)
Highest AQI (US) recorded in
June50AQI (US)
Lowest AQI (US) recorded in
May25AQI (US)
202430AQI (US)
Highest AQI (US) recorded in
August37AQI (US)
Lowest AQI (US) recorded in
April22AQI (US)
202341AQI (US)
Highest AQI (US) recorded in
June81AQI (US)
Lowest AQI (US) recorded in
December33AQI (US)
202234AQI (US)
Highest AQI (US) recorded in
November39AQI (US)
Lowest AQI (US) recorded in
September28AQI (US)
202140AQI (US)
Highest AQI (US) recorded in
February70AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
202037AQI (US)
Highest AQI (US) recorded in
December44AQI (US)
Lowest AQI (US) recorded in
May30AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Rockford's annual 2026 AQI (US) (42) shows an average percentage change of 16.3% (worsened AQI (US)) compared to previous years: 2020 (37), 2021 (40), 2022 (34), 2023 (41), 2024 (30), 2025 (37).