Downtown, Hartford, 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
Downtown, Hartford, Connecticut, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 23 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Oct - 30th Oct 2025
Downtown, Hartford, Connecticut, United States
7 AM29th Oct 2025
6 PM
6 AM30th Oct 2025
22AQI
17AQI
28AQI
22AQI
In the last 24 hours,
Downtown's AQI reached its highest point of 28 at 9 PM during the Night, while the lowest point, 17, was recorded at 3 PM during the Day between 29th Oct and 30th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Downtown, Hartford, Connecticut, United States
19°C12/29°C
15°C9/22°C
13°C6/21°C
14°C6/24°C
18°C9/29°C
20°C11/32°C
20°C14/31°C
21°C16/29°C
18°C12/21°C
10°C6/16°C
8°C1/17°C
14°C8/20°C
13°C11/17°C
12°C11/13°C
12°C10/15°C
13°C7/20°C
9°C5/17°C
10°C5/19°C
11°C3/21°C
13°C7/21°C
16°C11/19°C
13°C8/21°C
14°C9/19°C
11°C7/16°C
9°C5/14°C
8°C3/14°C
8°C2/14°C
6°C0/13°C
7°C1/16°C
8°C6/10°C
--°C/°C
28AQI
18AQI
28AQI
18AQI
2025 Days Vs Air Quality
Downtown, Hartford, Connecticut, United States
84%
182
16%
34
0.4%
1
Total number of days with different AQI categories in last 303 days in 2025 (62 days remaining)
Under WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 303 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
Downtown, Hartford, Connecticut, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
17AQI
24AQI
40AQI
32AQI
46AQI
18AQI
19AQI
40AQI
26AQI
20AQI
19AQI
19AQI
21AQI
15AQI
30AQI
23AQI
15AQI
15AQI
21AQI
38AQI
10AQI
13AQI
27AQI
55AQI
17AQI
18AQI
34AQI
19AQI
37AQI
46AQI
32AQI
10AQI
21AQI
28AQI
24AQI
19AQI
41AQI
48AQI
38AQI
19AQI
21AQI
31AQI
22AQI
22AQI
14AQI
28AQI
27AQI
31AQI
30AQI
30AQI
38AQI
36AQI
18AQI
12AQI
12AQI
17AQI
14AQI
14AQI
14AQI
13AQI
18AQI
28AQI
25AQI
23AQI
37AQI
18AQI
14AQI
19AQI
28AQI
38AQI
61AQI
62AQI
48AQI
72AQI
73AQI
33AQI
52AQI
69AQI
67AQI
58AQI
42AQI
40AQI
31AQI
20AQI
24AQI
33AQI
58AQI
58AQI
58AQI
60AQI
53AQI
41AQI
30AQI
30AQI
42AQI
39AQI
48AQI
39AQI
49AQI
46AQI
79AQI
63AQI
50AQI
43AQI
29AQI
32AQI
34AQI
31AQI
21AQI
29AQI
31AQI
36AQI
42AQI
18AQI
25AQI
25AQI
41AQI
23AQI
31AQI
34AQI
44AQI
74AQI
93AQI
70AQI
59AQI
54AQI
62AQI
59AQI
41AQI
60AQI
78AQI
113AQI
77AQI
50AQI
35AQI
39AQI
43AQI
58AQI
60AQI
48AQI
40AQI
61AQI
57AQI
58AQI
24AQI
19AQI
19AQI
18AQI
27AQI
39AQI
29AQI
30AQI
20AQI
21AQI
26AQI
31AQI
18AQI
24AQI
33AQI
35AQI
34AQI
26AQI
39AQI
48AQI
42AQI
22AQI
24AQI
24AQI
32AQI
40AQI
42AQI
44AQI
51AQI
38AQI
24AQI
24AQI
34AQI
21AQI
28AQI
26AQI
31AQI
34AQI
20AQI
19AQI
24AQI
21AQI
35AQI
36AQI
16AQI
10AQI
23AQI
47AQI
71AQI
59AQI
45AQI
10AQI
9AQI
11AQI
12AQI
13AQI
24AQI
17AQI
10AQI
13AQI
13AQI
35AQI
35AQI
17AQI
21AQI
29AQI
21AQI
25AQI
18AQI
32AQI
33AQI
29AQI
23AQI
32AQI
24AQI
24AQI
45AQI
44AQI
43AQI
32AQI
25AQI
No. of days
202534AQI
Highest AQI recorded in
June45AQI
Lowest AQI recorded in
April24AQI
Most & Least Polluted Years Over the Last 1 Years
Downtown's annual 2025 AQI (34) shows an average percentage change of NaN% (improved AQI) compared to previous years: .