Bloomington, Indiana, 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
Bloomington, Indiana, United States
AQI Trends: Highest and Lowest
Same Day Analysis (15th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 45 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 15th Oct - 16th Oct 2025
Bloomington, Indiana, United States
7 AM15th Oct 2025
7 PM
6 AM16th Oct 2025
51AQI
28AQI
48AQI
39AQI
In the last 24 hours,
Bloomington's AQI reached its highest point of 51 at 7 PM during the Day, while the lowest point, 28, was recorded at 4 PM during the Day between 15th Oct and 16th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Bloomington, Indiana, United States
23°C17/31°C
23°C15/32°C
24°C13/33°C
24°C17/33°C
24°C19/29°C
24°C18/30°C
20°C18/21°C
21°C18/27°C
21°C19/25°C
20°C17/24°C
19°C12/26°C
21°C13/30°C
23°C15/33°C
23°C15/33°C
22°C15/31°C
21°C13/31°C
21°C13/32°C
23°C15/32°C
22°C15/31°C
21°C13/29°C
21°C17/26°C
20°C15/25°C
15°C9/22°C
13°C7/20°C
13°C5/22°C
15°C9/23°C
15°C8/24°C
16°C9/26°C
18°C11/28°C
18°C11/25°C
--°C/°C
37AQI
37AQI
43AQI
38AQI
2025 Days Vs Air Quality
Bloomington, Indiana, United States
85%
246
15%
42
Total number of days with different AQI categories in last 289 days in 2025 (76 days remaining)
Under WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2025, 85% of 289 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
Bloomington, Indiana, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
23AQI
22AQI
23AQI
23AQI
22AQI
23AQI
35AQI
60AQI
63AQI
45AQI
39AQI
24AQI
27AQI
41AQI
38AQI
34AQI
22AQI
19AQI
24AQI
29AQI
35AQI
32AQI
36AQI
41AQI
29AQI
24AQI
25AQI
22AQI
26AQI
21AQI
24AQI
27AQI
28AQI
27AQI
35AQI
26AQI
23AQI
23AQI
40AQI
28AQI
31AQI
48AQI
36AQI
26AQI
24AQI
26AQI
22AQI
25AQI
24AQI
24AQI
32AQI
43AQI
45AQI
37AQI
29AQI
29AQI
35AQI
24AQI
24AQI
27AQI
30AQI
34AQI
27AQI
26AQI
26AQI
38AQI
37AQI
32AQI
52AQI
53AQI
59AQI
55AQI
35AQI
22AQI
22AQI
21AQI
27AQI
18AQI
20AQI
21AQI
34AQI
20AQI
19AQI
27AQI
32AQI
44AQI
52AQI
37AQI
20AQI
27AQI
25AQI
20AQI
21AQI
14AQI
21AQI
29AQI
15AQI
24AQI
30AQI
43AQI
41AQI
37AQI
38AQI
21AQI
24AQI
30AQI
51AQI
36AQI
38AQI
27AQI
20AQI
29AQI
42AQI
28AQI
29AQI
27AQI
28AQI
47AQI
33AQI
40AQI
28AQI
22AQI
23AQI
17AQI
22AQI
24AQI
30AQI
28AQI
32AQI
36AQI
25AQI
22AQI
24AQI
41AQI
53AQI
26AQI
18AQI
24AQI
29AQI
17AQI
14AQI
17AQI
19AQI
20AQI
19AQI
20AQI
20AQI
25AQI
27AQI
45AQI
27AQI
41AQI
56AQI
68AQI
44AQI
44AQI
52AQI
49AQI
55AQI
57AQI
60AQI
68AQI
63AQI
32AQI
38AQI
37AQI
33AQI
35AQI
30AQI
41AQI
43AQI
46AQI
59AQI
58AQI
55AQI
53AQI
48AQI
35AQI
33AQI
28AQI
29AQI
37AQI
48AQI
55AQI
74AQI
60AQI
44AQI
58AQI
58AQI
41AQI
46AQI
48AQI
41AQI
38AQI
35AQI
30AQI
25AQI
23AQI
26AQI
31AQI
30AQI
58AQI
60AQI
53AQI
51AQI
42AQI
25AQI
26AQI
31AQI
35AQI
38AQI
81AQI
59AQI
41AQI
37AQI
37AQI
35AQI
36AQI
40AQI
44AQI
43AQI
49AQI
43AQI
32AQI
56AQI
57AQI
57AQI
38AQI
36AQI
42AQI
24AQI
21AQI
29AQI
33AQI
27AQI
20AQI
21AQI
26AQI
30AQI
29AQI
26AQI
28AQI
28AQI
28AQI
32AQI
44AQI
50AQI
28AQI
28AQI
22AQI
26AQI
39AQI
50AQI
44AQI
47AQI
50AQI
51AQI
47AQI
49AQI
52AQI
53AQI
53AQI
51AQI
37AQI
32AQI
25AQI
23AQI
29AQI
37AQI
40AQI
35AQI
31AQI
40AQI
41AQI
54AQI
54AQI
45AQI
34AQI
28AQI
19AQI
29AQI
29AQI
44AQI
37AQI
37AQI
37AQI
45AQI
31AQI
30AQI
32AQI
30AQI
26AQI
46AQI
42AQI
38AQI
39AQI
38AQI
No. of days
202535AQI
Highest AQI recorded in
June46AQI
Lowest AQI recorded in
May26AQI
202428AQI
Highest AQI recorded in
July36AQI
Lowest AQI recorded in
September21AQI
202335AQI
Highest AQI recorded in
June68AQI
Lowest AQI recorded in
October24AQI
202232AQI
Highest AQI recorded in
May56AQI
Lowest AQI recorded in
March4AQI
202134AQI
Highest AQI recorded in
July45AQI
Lowest AQI recorded in
November24AQI
202034AQI
Highest AQI recorded in
December40AQI
Lowest AQI recorded in
May15AQI
Most & Least Polluted Years Over the Last 6 Years
Bloomington's annual 2025 AQI (35) shows an average percentage change of 8.02% (worsened AQI) compared to previous years: 2020 (34), 2021 (34), 2022 (32), 2023 (35), 2024 (28).