Altoona, Wisconsin, 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
Altoona, Wisconsin, United States
AQI Trends: Highest and Lowest
Same Day Analysis (17th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 54 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Altoona, Wisconsin, United States
7 AM17th Oct 2025
6 PM
6 AM18th Oct 2025
70AQI
29AQI
46AQI
31AQI
In the last 24 hours,
Altoona's AQI reached its highest point of 70 at 11 AM during the Day, while the lowest point, 29, was recorded at 7 AM during the Day between 17th Oct and 18th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Altoona, Wisconsin, United States
19°C13/23°C
19°C17/20°C
18°C17/21°C
20°C15/25°C
18°C16/21°C
18°C13/25°C
17°C12/24°C
18°C10/27°C
19°C13/26°C
18°C13/26°C
15°C6/27°C
19°C9/32°C
20°C13/29°C
21°C15/28°C
21°C14/30°C
24°C16/32°C
25°C18/33°C
23°C16/29°C
13°C9/18°C
12°C5/20°C
8°C0/18°C
11°C1/21°C
15°C9/22°C
10°C2/20°C
15°C9/23°C
14°C9/20°C
11°C7/15°C
10°C8/13°C
13°C11/18°C
17°C13/23°C
--°C/°C
34AQI
28AQI
32AQI
28AQI
2025 Days Vs Air Quality
Altoona, Wisconsin, United States
83%
241
14%
42
2%
5
0.6%
2
Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)
Under WHO’s Safe Air Quality Limits: 83%
Health Risk Level:
Low
In 2025, 83% of 291 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
Altoona, Wisconsin, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI
29AQI
20AQI
19AQI
19AQI
19AQI
23AQI
30AQI
51AQI
51AQI
28AQI
28AQI
28AQI
25AQI
41AQI
25AQI
24AQI
20AQI
21AQI
21AQI
22AQI
25AQI
25AQI
34AQI
25AQI
22AQI
22AQI
23AQI
23AQI
29AQI
33AQI
23AQI
44AQI
25AQI
23AQI
24AQI
29AQI
28AQI
32AQI
30AQI
42AQI
27AQI
34AQI
29AQI
46AQI
39AQI
24AQI
24AQI
23AQI
23AQI
23AQI
33AQI
43AQI
67AQI
29AQI
28AQI
28AQI
29AQI
25AQI
26AQI
27AQI
41AQI
56AQI
26AQI
26AQI
29AQI
26AQI
27AQI
28AQI
27AQI
26AQI
34AQI
49AQI
46AQI
15AQI
19AQI
20AQI
18AQI
20AQI
22AQI
19AQI
23AQI
19AQI
26AQI
24AQI
19AQI
48AQI
20AQI
15AQI
17AQI
18AQI
23AQI
16AQI
20AQI
20AQI
22AQI
15AQI
21AQI
41AQI
46AQI
49AQI
61AQI
49AQI
26AQI
15AQI
15AQI
39AQI
42AQI
18AQI
25AQI
13AQI
21AQI
23AQI
15AQI
15AQI
18AQI
27AQI
30AQI
15AQI
19AQI
21AQI
19AQI
14AQI
29AQI
18AQI
23AQI
20AQI
16AQI
29AQI
29AQI
22AQI
30AQI
34AQI
31AQI
37AQI
28AQI
15AQI
14AQI
12AQI
14AQI
17AQI
15AQI
16AQI
26AQI
24AQI
24AQI
20AQI
22AQI
25AQI
35AQI
42AQI
37AQI
51AQI
107AQI
100AQI
59AQI
60AQI
64AQI
71AQI
44AQI
76AQI
83AQI
107AQI
60AQI
35AQI
36AQI
42AQI
30AQI
34AQI
32AQI
29AQI
39AQI
40AQI
49AQI
35AQI
37AQI
25AQI
17AQI
23AQI
24AQI
23AQI
35AQI
46AQI
37AQI
36AQI
41AQI
43AQI
56AQI
53AQI
35AQI
34AQI
30AQI
80AQI
143AQI
98AQI
73AQI
39AQI
19AQI
21AQI
26AQI
30AQI
68AQI
57AQI
43AQI
29AQI
72AQI
58AQI
33AQI
28AQI
41AQI
100AQI
158AQI
159AQI
138AQI
105AQI
91AQI
75AQI
70AQI
55AQI
48AQI
46AQI
31AQI
54AQI
65AQI
61AQI
64AQI
53AQI
28AQI
25AQI
20AQI
26AQI
26AQI
21AQI
26AQI
25AQI
17AQI
18AQI
24AQI
31AQI
33AQI
28AQI
29AQI
35AQI
35AQI
33AQI
46AQI
39AQI
23AQI
18AQI
22AQI
32AQI
43AQI
42AQI
41AQI
47AQI
51AQI
54AQI
53AQI
54AQI
53AQI
39AQI
38AQI
24AQI
29AQI
26AQI
29AQI
25AQI
27AQI
30AQI
31AQI
28AQI
30AQI
30AQI
40AQI
46AQI
60AQI
65AQI
57AQI
42AQI
28AQI
23AQI
24AQI
37AQI
33AQI
30AQI
37AQI
23AQI
16AQI
43AQI
54AQI
27AQI
31AQI
27AQI
26AQI
23AQI
49AQI
54AQI
49AQI
36AQI
39AQI
No. of days
202536AQI
Highest AQI recorded in
July54AQI
Lowest AQI recorded in
May23AQI
202430AQI
Highest AQI recorded in
July37AQI
Lowest AQI recorded in
March24AQI
202340AQI
Highest AQI recorded in
June75AQI
Lowest AQI recorded in
October24AQI
202233AQI
Highest AQI recorded in
January37AQI
Lowest AQI recorded in
September30AQI
202139AQI
Highest AQI recorded in
July56AQI
Lowest AQI recorded in
October29AQI
202034AQI
Highest AQI recorded in
December41AQI
Lowest AQI recorded in
September27AQI
Most & Least Polluted Years Over the Last 6 Years
Altoona's annual 2025 AQI (36) shows an average percentage change of 3.3% (worsened AQI) compared to previous years: 2020 (34), 2021 (39), 2022 (33), 2023 (40), 2024 (30).