Fort Griswold Battlefield State Park, Groton, 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
Fort Griswold Battlefield State Park, Groton, Connecticut, United States
AQI Trends: Highest and Lowest
Same Day Analysis (2nd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 9 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Oct - 3rd Oct 2025
Fort Griswold Battlefield State Park, Groton, Connecticut, United States
6 AM2nd Oct 2025
6 PM
5 AM3rd Oct 2025
24AQI
6AQI
18AQI
7AQI
In the last 24 hours,
Fort Griswold Battlefield State Park's AQI reached its highest point of 24 at 7 AM during the Day, while the lowest point, 6, was recorded at 10 AM during the Day between 2nd Oct and 3rd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Fort Griswold Battlefield State Park, Groton, Connecticut, United States
18°C9/25°C
19°C12/25°C
22°C18/26°C
23°C21/26°C
19°C16/20°C
17°C12/21°C
17°C10/24°C
18°C15/22°C
19°C11/27°C
20°C14/24°C
19°C12/24°C
20°C14/25°C
19°C14/24°C
18°C13/23°C
17°C13/20°C
20°C17/25°C
21°C14/28°C
17°C13/21°C
16°C8/23°C
16°C8/22°C
20°C16/26°C
20°C18/23°C
21°C18/23°C
22°C19/27°C
20°C15/26°C
21°C18/27°C
20°C15/26°C
19°C13/29°C
15°C10/22°C
13°C7/21°C
--°C/°C
27AQI
25AQI
27AQI
26AQI
2025 Days Vs Air Quality
Fort Griswold Battlefield State Park, Groton, Connecticut, United States
88%
243
12%
32
Total number of days with different AQI categories in last 276 days in 2025 (89 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 276 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
Fort Griswold Battlefield State Park, Groton, Connecticut, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI
18AQI
19AQI
19AQI
20AQI
19AQI
19AQI
19AQI
20AQI
21AQI
24AQI
28AQI
52AQI
25AQI
21AQI
32AQI
55AQI
38AQI
30AQI
21AQI
30AQI
38AQI
52AQI
53AQI
44AQI
41AQI
27AQI
26AQI
26AQI
22AQI
30AQI
22AQI
21AQI
41AQI
27AQI
22AQI
29AQI
30AQI
22AQI
24AQI
34AQI
34AQI
33AQI
21AQI
21AQI
22AQI
21AQI
23AQI
23AQI
23AQI
22AQI
22AQI
25AQI
45AQI
45AQI
41AQI
29AQI
44AQI
24AQI
29AQI
22AQI
24AQI
41AQI
35AQI
22AQI
21AQI
21AQI
22AQI
29AQI
27AQI
21AQI
21AQI
25AQI
21AQI
32AQI
16AQI
17AQI
23AQI
15AQI
14AQI
19AQI
17AQI
23AQI
36AQI
20AQI
18AQI
29AQI
37AQI
24AQI
30AQI
16AQI
19AQI
36AQI
30AQI
19AQI
15AQI
17AQI
15AQI
16AQI
26AQI
19AQI
14AQI
17AQI
21AQI
40AQI
11AQI
17AQI
22AQI
56AQI
25AQI
17AQI
38AQI
20AQI
26AQI
34AQI
36AQI
11AQI
16AQI
25AQI
26AQI
17AQI
42AQI
53AQI
36AQI
20AQI
25AQI
26AQI
25AQI
24AQI
13AQI
23AQI
23AQI
28AQI
28AQI
26AQI
27AQI
36AQI
19AQI
13AQI
12AQI
16AQI
13AQI
14AQI
14AQI
13AQI
18AQI
23AQI
20AQI
17AQI
32AQI
20AQI
16AQI
19AQI
23AQI
34AQI
53AQI
54AQI
30AQI
59AQI
64AQI
26AQI
43AQI
62AQI
65AQI
55AQI
35AQI
34AQI
24AQI
19AQI
24AQI
31AQI
52AQI
53AQI
54AQI
58AQI
52AQI
45AQI
25AQI
28AQI
40AQI
34AQI
39AQI
31AQI
41AQI
43AQI
60AQI
58AQI
44AQI
46AQI
34AQI
32AQI
28AQI
25AQI
22AQI
23AQI
24AQI
34AQI
38AQI
21AQI
22AQI
21AQI
38AQI
23AQI
23AQI
25AQI
42AQI
69AQI
81AQI
64AQI
59AQI
53AQI
62AQI
52AQI
36AQI
44AQI
52AQI
83AQI
64AQI
49AQI
31AQI
32AQI
34AQI
45AQI
51AQI
38AQI
31AQI
50AQI
47AQI
53AQI
25AQI
19AQI
20AQI
16AQI
25AQI
37AQI
28AQI
29AQI
20AQI
19AQI
21AQI
25AQI
18AQI
21AQI
28AQI
27AQI
26AQI
24AQI
38AQI
44AQI
37AQI
22AQI
22AQI
22AQI
25AQI
32AQI
31AQI
34AQI
43AQI
30AQI
21AQI
20AQI
31AQI
21AQI
25AQI
23AQI
28AQI
31AQI
16AQI
20AQI
16AQI
21AQI
33AQI
33AQI
15AQI
9AQI
29AQI
28AQI
24AQI
23AQI
23AQI
40AQI
40AQI
36AQI
27AQI
12AQI
No. of days
202530AQI
Highest AQI recorded in
June40AQI
Lowest AQI recorded in
October12AQI
202424AQI
Highest AQI recorded in
August34AQI
Lowest AQI recorded in
March19AQI
202331AQI
Highest AQI recorded in
June48AQI
Lowest AQI recorded in
November23AQI
202227AQI
Highest AQI recorded in
July35AQI
Lowest AQI recorded in
April22AQI
202130AQI
Highest AQI recorded in
July42AQI
Lowest AQI recorded in
May24AQI
202030AQI
Highest AQI recorded in
July34AQI
Lowest AQI recorded in
September24AQI
Most & Least Polluted Years Over the Last 6 Years
Fort Griswold Battlefield State Park's annual 2025 AQI (30) shows an average percentage change of 6.02% (worsened AQI) compared to previous years: 2020 (30), 2021 (30), 2022 (27), 2023 (31), 2024 (24).