Waterbury, Connecticut, 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
Waterbury, Connecticut, United States
AQI Trends: Highest and Lowest
Same Day Analysis (31st October ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 49 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 1st Oct - 2nd Oct 2025
Waterbury, Connecticut, United States
6 AM1st Oct 2025
6 PM
5 AM2nd Oct 2025
20AQI
6AQI
8AQI
6AQI
In the last 24 hours,
Waterbury's AQI reached its highest point of 20 at 6 AM during the Day, while the lowest point, 6, was recorded at 3 AM during the Night between 1st Oct and 2nd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Waterbury, Connecticut, United States
18°C9/26°C
17°C6/26°C
19°C9/27°C
23°C17/30°C
23°C18/31°C
18°C15/22°C
16°C10/21°C
16°C7/24°C
16°C12/19°C
18°C6/25°C
20°C13/24°C
17°C12/23°C
20°C12/28°C
20°C14/27°C
19°C14/23°C
16°C12/20°C
21°C16/29°C
20°C15/25°C
16°C11/22°C
15°C8/24°C
15°C7/23°C
19°C13/27°C
20°C18/24°C
21°C19/23°C
21°C18/26°C
20°C14/28°C
22°C16/31°C
20°C14/28°C
19°C13/28°C
15°C9/22°C
--°C/°C
31AQI
27AQI
31AQI
28AQI
2025 Days Vs Air Quality
Waterbury, Connecticut, United States
88%
240
12%
32
0.3%
1
Total number of days with different AQI categories in last 275 days in 2025 (90 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 275 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
Waterbury, Connecticut, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI
18AQI
20AQI
18AQI
19AQI
19AQI
19AQI
20AQI
21AQI
23AQI
23AQI
34AQI
55AQI
28AQI
21AQI
39AQI
60AQI
45AQI
31AQI
21AQI
37AQI
50AQI
59AQI
58AQI
50AQI
48AQI
36AQI
25AQI
28AQI
24AQI
44AQI
23AQI
24AQI
58AQI
28AQI
22AQI
37AQI
29AQI
24AQI
26AQI
38AQI
48AQI
47AQI
22AQI
22AQI
25AQI
23AQI
24AQI
24AQI
24AQI
22AQI
23AQI
29AQI
46AQI
54AQI
43AQI
30AQI
39AQI
24AQI
26AQI
23AQI
28AQI
45AQI
33AQI
21AQI
24AQI
23AQI
25AQI
31AQI
33AQI
24AQI
22AQI
25AQI
26AQI
33AQI
17AQI
17AQI
24AQI
17AQI
14AQI
19AQI
18AQI
25AQI
33AQI
22AQI
22AQI
29AQI
46AQI
30AQI
40AQI
18AQI
19AQI
31AQI
24AQI
18AQI
17AQI
17AQI
16AQI
16AQI
28AQI
22AQI
13AQI
15AQI
27AQI
36AQI
12AQI
17AQI
25AQI
50AQI
19AQI
17AQI
25AQI
18AQI
32AQI
42AQI
27AQI
10AQI
17AQI
27AQI
21AQI
18AQI
35AQI
45AQI
30AQI
15AQI
17AQI
28AQI
25AQI
18AQI
15AQI
29AQI
24AQI
34AQI
28AQI
28AQI
42AQI
42AQI
18AQI
13AQI
14AQI
16AQI
12AQI
12AQI
14AQI
13AQI
18AQI
22AQI
25AQI
18AQI
34AQI
17AQI
16AQI
18AQI
26AQI
41AQI
61AQI
62AQI
46AQI
62AQI
65AQI
23AQI
48AQI
67AQI
65AQI
58AQI
42AQI
39AQI
25AQI
19AQI
23AQI
30AQI
52AQI
52AQI
54AQI
58AQI
48AQI
40AQI
28AQI
27AQI
40AQI
33AQI
42AQI
30AQI
42AQI
40AQI
59AQI
62AQI
40AQI
37AQI
27AQI
29AQI
31AQI
31AQI
21AQI
24AQI
24AQI
35AQI
36AQI
17AQI
21AQI
21AQI
37AQI
25AQI
26AQI
29AQI
43AQI
74AQI
91AQI
65AQI
57AQI
49AQI
54AQI
50AQI
39AQI
55AQI
81AQI
103AQI
74AQI
42AQI
32AQI
38AQI
46AQI
56AQI
56AQI
40AQI
32AQI
56AQI
55AQI
56AQI
24AQI
18AQI
17AQI
15AQI
23AQI
33AQI
27AQI
27AQI
21AQI
19AQI
22AQI
27AQI
18AQI
22AQI
27AQI
28AQI
28AQI
31AQI
35AQI
48AQI
39AQI
21AQI
20AQI
21AQI
25AQI
33AQI
41AQI
42AQI
46AQI
36AQI
22AQI
24AQI
30AQI
21AQI
25AQI
22AQI
29AQI
30AQI
22AQI
21AQI
24AQI
27AQI
38AQI
41AQI
33AQI
31AQI
26AQI
23AQI
23AQI
42AQI
39AQI
39AQI
30AQI
No. of days
202532AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
April23AQI
202426AQI
Highest AQI recorded in
August34AQI
Lowest AQI recorded in
March17AQI
202333AQI
Highest AQI recorded in
June52AQI
Lowest AQI recorded in
March26AQI
202231AQI
Highest AQI recorded in
January43AQI
Lowest AQI recorded in
April22AQI
202135AQI
Highest AQI recorded in
July49AQI
Lowest AQI recorded in
May28AQI
202033AQI
Highest AQI recorded in
December39AQI
Lowest AQI recorded in
March22AQI
Most & Least Polluted Years Over the Last 6 Years
Waterbury's annual 2025 AQI (32) shows an average percentage change of 1.9% (worsened AQI) compared to previous years: 2020 (33), 2021 (35), 2022 (31), 2023 (33), 2024 (26).