Springfield, 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
Springfield, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 50 of Good air quality on the same day.
Day & Night AQI Trend: 28th Sep - 29th Sep 2026
Springfield, Illinois, United States
6 AM28th Sep 2026
7 PM
5 AM29th Sep 2026
59AQI
30AQI
60AQI
34AQI
In the last 24 hours,
Springfield's AQI reached its highest point of 60 at 5 AM during the Night, while the lowest point, 30, was recorded at 6 PM during the Day between 28th Sep and 29th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Springfield, Illinois, United States
30°C22/39°C
32°C24/40°C
32°C25/39°C
32°C25/40°C
32°C25/40°C
31°C23/40°C
26°C22/33°C
23°C15/33°C
26°C16/37°C
27°C23/32°C
22°C20/23°C
23°C19/29°C
26°C19/33°C
23°C18/28°C
22°C14/30°C
27°C22/36°C
26°C20/32°C
28°C23/36°C
24°C19/30°C
25°C22/29°C
24°C18/30°C
17°C16/18°C
16°C13/21°C
16°C13/21°C
18°C13/24°C
18°C16/21°C
17°C14/19°C
18°C15/23°C
18°C12/26°C
21°C14/27°C
44AQI
40AQI
47AQI
42AQI
2026 Days Vs Air Quality
Springfield, Illinois, United States
92%
248
7%
20
0.3%
1
Total number of days with different AQI categories in last 272 days in 2026 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2026, 92% of 272 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
Springfield, Illinois, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI (US)
29AQI (US)
29AQI (US)
40AQI (US)
45AQI (US)
46AQI (US)
46AQI (US)
36AQI (US)
24AQI (US)
28AQI (US)
19AQI (US)
22AQI (US)
24AQI (US)
12AQI (US)
12AQI (US)
17AQI (US)
12AQI (US)
13AQI (US)
20AQI (US)
22AQI (US)
38AQI (US)
59AQI (US)
58AQI (US)
50AQI (US)
52AQI (US)
50AQI (US)
37AQI (US)
44AQI (US)
58AQI (US)
64AQI (US)
42AQI (US)
47AQI (US)
51AQI (US)
49AQI (US)
45AQI (US)
50AQI (US)
45AQI (US)
40AQI (US)
44AQI (US)
49AQI (US)
39AQI (US)
26AQI (US)
33AQI (US)
39AQI (US)
40AQI (US)
40AQI (US)
41AQI (US)
40AQI (US)
42AQI (US)
36AQI (US)
28AQI (US)
25AQI (US)
24AQI (US)
37AQI (US)
40AQI (US)
41AQI (US)
29AQI (US)
38AQI (US)
26AQI (US)
36AQI (US)
48AQI (US)
35AQI (US)
36AQI (US)
42AQI (US)
32AQI (US)
35AQI (US)
36AQI (US)
32AQI (US)
30AQI (US)
38AQI (US)
28AQI (US)
34AQI (US)
27AQI (US)
22AQI (US)
29AQI (US)
33AQI (US)
22AQI (US)
46AQI (US)
52AQI (US)
38AQI (US)
39AQI (US)
37AQI (US)
24AQI (US)
36AQI (US)
46AQI (US)
28AQI (US)
19AQI (US)
28AQI (US)
36AQI (US)
35AQI (US)
27AQI (US)
20AQI (US)
21AQI (US)
30AQI (US)
29AQI (US)
29AQI (US)
25AQI (US)
40AQI (US)
36AQI (US)
32AQI (US)
27AQI (US)
38AQI (US)
29AQI (US)
28AQI (US)
29AQI (US)
21AQI (US)
25AQI (US)
23AQI (US)
24AQI (US)
28AQI (US)
35AQI (US)
19AQI (US)
16AQI (US)
25AQI (US)
23AQI (US)
24AQI (US)
23AQI (US)
24AQI (US)
20AQI (US)
18AQI (US)
28AQI (US)
37AQI (US)
32AQI (US)
26AQI (US)
25AQI (US)
35AQI (US)
25AQI (US)
20AQI (US)
31AQI (US)
40AQI (US)
20AQI (US)
43AQI (US)
48AQI (US)
55AQI (US)
55AQI (US)
49AQI (US)
44AQI (US)
41AQI (US)
37AQI (US)
47AQI (US)
43AQI (US)
45AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
32AQI (US)
29AQI (US)
30AQI (US)
31AQI (US)
31AQI (US)
27AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
30AQI (US)
29AQI (US)
24AQI (US)
26AQI (US)
25AQI (US)
25AQI (US)
27AQI (US)
18AQI (US)
27AQI (US)
29AQI (US)
30AQI (US)
30AQI (US)
39AQI (US)
29AQI (US)
33AQI (US)
30AQI (US)
29AQI (US)
42AQI (US)
37AQI (US)
33AQI (US)
35AQI (US)
36AQI (US)
35AQI (US)
34AQI (US)
32AQI (US)
34AQI (US)
34AQI (US)
37AQI (US)
42AQI (US)
45AQI (US)
46AQI (US)
71AQI (US)
132AQI (US)
56AQI (US)
43AQI (US)
36AQI (US)
42AQI (US)
49AQI (US)
50AQI (US)
54AQI (US)
52AQI (US)
42AQI (US)
42AQI (US)
44AQI (US)
41AQI (US)
44AQI (US)
43AQI (US)
46AQI (US)
48AQI (US)
40AQI (US)
43AQI (US)
49AQI (US)
46AQI (US)
46AQI (US)
43AQI (US)
45AQI (US)
46AQI (US)
45AQI (US)
49AQI (US)
46AQI (US)
22AQI (US)
44AQI (US)
44AQI (US)
44AQI (US)
50AQI (US)
46AQI (US)
53AQI (US)
61AQI (US)
56AQI (US)
53AQI (US)
44AQI (US)
48AQI (US)
47AQI (US)
46AQI (US)
52AQI (US)
53AQI (US)
50AQI (US)
48AQI (US)
48AQI (US)
46AQI (US)
40AQI (US)
36AQI (US)
45AQI (US)
47AQI (US)
33AQI (US)
42AQI (US)
45AQI (US)
44AQI (US)
32AQI (US)
43AQI (US)
48AQI (US)
50AQI (US)
51AQI (US)
50AQI (US)
49AQI (US)
28AQI (US)
29AQI (US)
16AQI (US)
28AQI (US)
40AQI (US)
40AQI (US)
48AQI (US)
46AQI (US)
50AQI (US)
35AQI (US)
39AQI (US)
34AQI (US)
27AQI (US)
35AQI (US)
28AQI (US)
44AQI (US)
46AQI (US)
42AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
August46AQI (US)
Lowest AQI (US) recorded in
April27AQI (US)
202537AQI (US)
Highest AQI (US) recorded in
June47AQI (US)
Lowest AQI (US) recorded in
May26AQI (US)
202429AQI (US)
Highest AQI (US) recorded in
August38AQI (US)
Lowest AQI (US) recorded in
April20AQI (US)
202339AQI (US)
Highest AQI (US) recorded in
June68AQI (US)
Lowest AQI (US) recorded in
December29AQI (US)
202237AQI (US)
Highest AQI (US) recorded in
August49AQI (US)
Lowest AQI (US) recorded in
April29AQI (US)
202135AQI (US)
Highest AQI (US) recorded in
July46AQI (US)
Lowest AQI (US) recorded in
October27AQI (US)
202032AQI (US)
Highest AQI (US) recorded in
December39AQI (US)
Lowest AQI (US) recorded in
May21AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Springfield's annual 2026 AQI (US) (37) shows an average percentage change of 7.2% (worsened AQI (US)) compared to previous years: 2020 (32), 2021 (35), 2022 (37), 2023 (39), 2024 (29), 2025 (37).