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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

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!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

July Air Quality Analysis

Fort Griswold Battlefield State Park, Groton, Connecticut, United States

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
1st Jul 2023
101AQI
Lowest AQI recorded on
7th Jul 2026
12AQI

Same Day Analysis (17th July):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 78 of Moderate air quality on the same day.

Day & Night AQI Trend: 16th Jul - 17th Jul 2026

Fort Griswold Battlefield State Park, Groton, Connecticut, United States

AQI
Day
Night
.

5 AM16th Jul 2026

8 PM

4 AM17th Jul 2026

Day time
Avg. Highest Time
8PM16th Jul

91AQI

Avg. Lowest Time
2PM16th Jul

31AQI

Night time
Avg. Highest Time
12AM17th Jul

116AQI

Avg. Lowest Time
11PM16th Jul

81AQI

In the last 24 hours,

Fort Griswold Battlefield State Park's AQI reached its highest point of 116 at 12 AM during the Night, while the lowest point, 31, was recorded at 2 PM during the Day between 16th Jul and 17th Jul 2026.

Day & Night AQI Trend : Jun - Jul 2026

Fort Griswold Battlefield State Park, Groton, Connecticut, United States

JunJul
18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th
Day
Night
18th Jun 2026205 AMAQI
18th Jun 2026226 AMAQI
18th Jun 2026257 AMAQI
18th Jun 2026238 AMAQI
18th Jun 2026109 AMAQI
18th Jun 20262910 AMAQI
18th Jun 20261911 AMAQI
18th Jun 20263612 PMAQI
18th Jun 2026311 PMAQI
18th Jun 2026162 PMAQI
18th Jun 2026203 PMAQI
18th Jun 2026234 PMAQI
18th Jun 2026245 PMAQI
18th Jun 2026246 PMAQI
18th Jun 2026267 PMAQI
18th Jun 2026288 PMAQI
18th Jun 2026289 PMAQI
18th Jun 20262410 PMAQI
18th Jun 20262011 PMAQI
19th Jun 20262012 AMAQI
19th Jun 2026171 AMAQI
19th Jun 2026162 AMAQI
19th Jun 2026143 AMAQI
19th Jun 2026124 AMAQI

22°C16/30°C

19th Jun 2026105 AMAQI
19th Jun 2026106 AMAQI
19th Jun 2026207 AMAQI
19th Jun 2026208 AMAQI
19th Jun 2026149 AMAQI
19th Jun 20261910 AMAQI
19th Jun 20262611 AMAQI
19th Jun 20262512 PMAQI
19th Jun 2026261 PMAQI
19th Jun 2026112 PMAQI
19th Jun 2026113 PMAQI
19th Jun 2026124 PMAQI
19th Jun 2026115 PMAQI
19th Jun 2026116 PMAQI
19th Jun 2026117 PMAQI
19th Jun 2026128 PMAQI
19th Jun 2026129 PMAQI
19th Jun 20261410 PMAQI
19th Jun 20261111 PMAQI
20th Jun 20261212 AMAQI
20th Jun 2026101 AMAQI
20th Jun 2026122 AMAQI
20th Jun 2026183 AMAQI
20th Jun 2026244 AMAQI

23°C17/28°C

20th Jun 2026235 AMAQI
20th Jun 2026216 AMAQI
20th Jun 2026167 AMAQI
20th Jun 2026198 AMAQI
20th Jun 2026249 AMAQI
20th Jun 20261210 AMAQI
20th Jun 20261611 AMAQI
20th Jun 20261412 PMAQI
20th Jun 2026141 PMAQI
20th Jun 2026132 PMAQI
20th Jun 2026163 PMAQI
20th Jun 2026104 PMAQI
20th Jun 2026125 PMAQI
20th Jun 2026106 PMAQI
20th Jun 2026127 PMAQI
20th Jun 2026128 PMAQI
20th Jun 2026119 PMAQI
20th Jun 20261210 PMAQI
20th Jun 2026911 PMAQI
21st Jun 20261712 AMAQI
21st Jun 2026171 AMAQI
21st Jun 2026172 AMAQI
21st Jun 2026173 AMAQI
21st Jun 2026204 AMAQI

21°C16/28°C

21st Jun 2026185 AMAQI
21st Jun 2026146 AMAQI
21st Jun 2026187 AMAQI
21st Jun 2026148 AMAQI
21st Jun 2026229 AMAQI
21st Jun 20262410 AMAQI
21st Jun 20262511 AMAQI
21st Jun 20262412 PMAQI
21st Jun 2026261 PMAQI
21st Jun 2026262 PMAQI
21st Jun 2026223 PMAQI
21st Jun 2026154 PMAQI
21st Jun 2026145 PMAQI
21st Jun 2026186 PMAQI
21st Jun 2026227 PMAQI
21st Jun 2026228 PMAQI
21st Jun 2026129 PMAQI
21st Jun 20261210 PMAQI
21st Jun 20261211 PMAQI
22nd Jun 2026812 AMAQI
22nd Jun 202681 AMAQI
22nd Jun 2026222 AMAQI
22nd Jun 2026223 AMAQI
22nd Jun 2026134 AMAQI

22°C14/30°C

22nd Jun 2026185 AMAQI
22nd Jun 2026196 AMAQI
22nd Jun 2026207 AMAQI
22nd Jun 2026188 AMAQI
22nd Jun 2026129 AMAQI
22nd Jun 20261710 AMAQI
22nd Jun 20261711 AMAQI
22nd Jun 2026812 PMAQI
22nd Jun 2026161 PMAQI
22nd Jun 2026122 PMAQI
22nd Jun 2026113 PMAQI
22nd Jun 202694 PMAQI
22nd Jun 2026145 PMAQI
22nd Jun 2026176 PMAQI
22nd Jun 202697 PMAQI
22nd Jun 2026108 PMAQI
22nd Jun 2026149 PMAQI
22nd Jun 20261010 PMAQI
22nd Jun 20261211 PMAQI
23rd Jun 20261612 AMAQI
23rd Jun 2026221 AMAQI
23rd Jun 2026252 AMAQI
23rd Jun 2026203 AMAQI
23rd Jun 2026184 AMAQI

20°C15/26°C

23rd Jun 2026295 AMAQI
23rd Jun 2026206 AMAQI
23rd Jun 2026127 AMAQI
23rd Jun 2026118 AMAQI
23rd Jun 2026109 AMAQI
23rd Jun 20261210 AMAQI
23rd Jun 20261011 AMAQI
23rd Jun 20261112 PMAQI
23rd Jun 202681 PMAQI
23rd Jun 2026252 PMAQI
23rd Jun 2026163 PMAQI
23rd Jun 2026124 PMAQI
23rd Jun 2026185 PMAQI
23rd Jun 2026126 PMAQI
23rd Jun 2026247 PMAQI
23rd Jun 2026258 PMAQI
23rd Jun 2026189 PMAQI
23rd Jun 20261210 PMAQI
23rd Jun 20261211 PMAQI
24th Jun 20261212 AMAQI
24th Jun 2026121 AMAQI
24th Jun 2026172 AMAQI
24th Jun 2026143 AMAQI
24th Jun 2026164 AMAQI

21°C19/23°C

24th Jun 2026145 AMAQI
24th Jun 2026136 AMAQI
24th Jun 2026107 AMAQI
24th Jun 2026148 AMAQI
24th Jun 2026149 AMAQI
24th Jun 20261410 AMAQI
24th Jun 20261111 AMAQI
24th Jun 20261012 PMAQI
24th Jun 202691 PMAQI
24th Jun 2026102 PMAQI
24th Jun 2026123 PMAQI
24th Jun 2026104 PMAQI
24th Jun 2026145 PMAQI
24th Jun 202696 PMAQI
24th Jun 2026107 PMAQI
24th Jun 2026108 PMAQI
24th Jun 2026109 PMAQI
24th Jun 20261010 PMAQI
24th Jun 2026911 PMAQI
25th Jun 20261012 AMAQI
25th Jun 2026161 AMAQI
25th Jun 2026122 AMAQI
25th Jun 2026143 AMAQI
25th Jun 2026124 AMAQI

22°C16/30°C

25th Jun 2026105 AMAQI
25th Jun 2026106 AMAQI
25th Jun 2026147 AMAQI
25th Jun 2026108 AMAQI
25th Jun 2026139 AMAQI
25th Jun 20261010 AMAQI
25th Jun 20261111 AMAQI
25th Jun 20261012 PMAQI
25th Jun 2026101 PMAQI
25th Jun 2026122 PMAQI
25th Jun 2026213 PMAQI
25th Jun 2026124 PMAQI
25th Jun 2026125 PMAQI
25th Jun 2026126 PMAQI
25th Jun 2026107 PMAQI
25th Jun 202688 PMAQI
25th Jun 2026309 PMAQI
25th Jun 20261010 PMAQI
25th Jun 2026811 PMAQI
26th Jun 20261812 AMAQI
26th Jun 2026271 AMAQI
26th Jun 2026102 AMAQI
26th Jun 2026163 AMAQI
26th Jun 2026164 AMAQI

22°C15/31°C

26th Jun 2026165 AMAQI
26th Jun 2026246 AMAQI
26th Jun 2026117 AMAQI
26th Jun 2026248 AMAQI
26th Jun 2026269 AMAQI
26th Jun 20263010 AMAQI
26th Jun 20263111 AMAQI
26th Jun 2026912 PMAQI
26th Jun 2026101 PMAQI
26th Jun 202682 PMAQI
26th Jun 202683 PMAQI
26th Jun 2026114 PMAQI
26th Jun 2026165 PMAQI
26th Jun 2026146 PMAQI
26th Jun 2026177 PMAQI
26th Jun 2026168 PMAQI
26th Jun 2026169 PMAQI
26th Jun 20262510 PMAQI
26th Jun 20262411 PMAQI
27th Jun 20262812 AMAQI
27th Jun 2026311 AMAQI
27th Jun 2026162 AMAQI
27th Jun 2026283 AMAQI
27th Jun 2026154 AMAQI

21°C18/25°C

27th Jun 2026175 AMAQI
27th Jun 2026156 AMAQI
27th Jun 2026267 AMAQI
27th Jun 2026168 AMAQI
27th Jun 2026259 AMAQI
27th Jun 20262710 AMAQI
27th Jun 20262111 AMAQI
27th Jun 20261612 PMAQI
27th Jun 2026161 PMAQI
27th Jun 2026142 PMAQI
27th Jun 2026163 PMAQI
27th Jun 2026164 PMAQI
27th Jun 2026255 PMAQI
27th Jun 2026196 PMAQI
27th Jun 2026167 PMAQI
27th Jun 2026168 PMAQI
27th Jun 2026169 PMAQI
27th Jun 20261810 PMAQI
27th Jun 20262611 PMAQI
28th Jun 20261612 AMAQI
28th Jun 2026161 AMAQI
28th Jun 2026242 AMAQI
28th Jun 2026153 AMAQI
28th Jun 2026164 AMAQI

23°C18/31°C

28th Jun 2026155 AMAQI
28th Jun 2026146 AMAQI
28th Jun 2026147 AMAQI
28th Jun 2026148 AMAQI
28th Jun 2026169 AMAQI
28th Jun 20261410 AMAQI
28th Jun 20261611 AMAQI
28th Jun 20261212 PMAQI
28th Jun 2026211 PMAQI
28th Jun 2026152 PMAQI
28th Jun 2026123 PMAQI
28th Jun 2026124 PMAQI
28th Jun 2026125 PMAQI
28th Jun 2026186 PMAQI
28th Jun 2026177 PMAQI
28th Jun 2026188 PMAQI
28th Jun 2026109 PMAQI
28th Jun 20261110 PMAQI
28th Jun 20261611 PMAQI
29th Jun 20262512 AMAQI
29th Jun 2026171 AMAQI
29th Jun 2026182 AMAQI
29th Jun 2026213 AMAQI
29th Jun 2026184 AMAQI

21°C18/28°C

29th Jun 2026185 AMAQI
29th Jun 2026186 AMAQI
29th Jun 2026157 AMAQI
29th Jun 2026258 AMAQI
29th Jun 2026119 AMAQI
29th Jun 20261410 AMAQI
29th Jun 20261011 AMAQI
29th Jun 20262212 PMAQI
29th Jun 2026161 PMAQI
29th Jun 2026142 PMAQI
29th Jun 2026163 PMAQI
29th Jun 2026134 PMAQI
29th Jun 2026265 PMAQI
29th Jun 2026286 PMAQI
29th Jun 2026127 PMAQI
29th Jun 2026148 PMAQI
29th Jun 2026289 PMAQI
29th Jun 20261310 PMAQI
29th Jun 20262611 PMAQI
30th Jun 20261312 AMAQI
30th Jun 2026271 AMAQI
30th Jun 2026242 AMAQI
30th Jun 2026263 AMAQI
30th Jun 2026104 AMAQI

24°C18/32°C

30th Jun 2026265 AMAQI
30th Jun 2026426 AMAQI
30th Jun 2026427 AMAQI
30th Jun 2026228 AMAQI
30th Jun 2026109 AMAQI
30th Jun 20261210 AMAQI
30th Jun 20261211 AMAQI
30th Jun 20262512 PMAQI
30th Jun 2026241 PMAQI
30th Jun 2026232 PMAQI
30th Jun 2026243 PMAQI
30th Jun 2026244 PMAQI
30th Jun 2026255 PMAQI
30th Jun 2026166 PMAQI
30th Jun 2026387 PMAQI
30th Jun 2026148 PMAQI
30th Jun 2026239 PMAQI
30th Jun 20262910 PMAQI
30th Jun 20262511 PMAQI
1st Jul 20262512 AMAQI
1st Jul 2026181 AMAQI
1st Jul 2026292 AMAQI
1st Jul 2026183 AMAQI
1st Jul 2026134 AMAQI

25°C18/32°C

1st Jul 2026145 AMAQI
1st Jul 2026146 AMAQI
1st Jul 2026167 AMAQI
1st Jul 2026188 AMAQI
1st Jul 2026169 AMAQI
1st Jul 20262410 AMAQI
1st Jul 20261611 AMAQI
1st Jul 20261612 PMAQI
1st Jul 2026161 PMAQI
1st Jul 2026172 PMAQI
1st Jul 2026183 PMAQI
1st Jul 2026184 PMAQI
1st Jul 2026185 PMAQI
1st Jul 2026256 PMAQI
1st Jul 2026187 PMAQI
1st Jul 2026188 PMAQI
1st Jul 2026469 PMAQI
1st Jul 20261910 PMAQI
1st Jul 20261911 PMAQI
2nd Jul 20261812 AMAQI
2nd Jul 2026301 AMAQI
2nd Jul 2026192 AMAQI
2nd Jul 2026203 AMAQI
2nd Jul 2026204 AMAQI

26°C20/34°C

2nd Jul 2026205 AMAQI
2nd Jul 2026296 AMAQI
2nd Jul 2026307 AMAQI
2nd Jul 2026208 AMAQI
2nd Jul 2026369 AMAQI
2nd Jul 20262110 AMAQI
2nd Jul 20262211 AMAQI
2nd Jul 20262312 PMAQI
2nd Jul 2026361 PMAQI
2nd Jul 2026442 PMAQI
2nd Jul 2026373 PMAQI
2nd Jul 2026254 PMAQI
2nd Jul 2026355 PMAQI
2nd Jul 2026426 PMAQI
2nd Jul 2026457 PMAQI
2nd Jul 2026348 PMAQI
2nd Jul 2026329 PMAQI
2nd Jul 20264210 PMAQI
2nd Jul 20263111 PMAQI
3rd Jul 20263112 AMAQI
3rd Jul 2026341 AMAQI
3rd Jul 2026422 AMAQI
3rd Jul 2026353 AMAQI
3rd Jul 2026364 AMAQI

29°C22/38°C

3rd Jul 2026325 AMAQI
3rd Jul 2026316 AMAQI
3rd Jul 2026367 AMAQI
3rd Jul 2026348 AMAQI
3rd Jul 2026289 AMAQI
3rd Jul 20263910 AMAQI
3rd Jul 20262611 AMAQI
3rd Jul 20262612 PMAQI
3rd Jul 2026271 PMAQI
3rd Jul 2026222 PMAQI
3rd Jul 2026243 PMAQI
3rd Jul 2026274 PMAQI
3rd Jul 2026245 PMAQI
3rd Jul 2026276 PMAQI
3rd Jul 2026247 PMAQI
3rd Jul 2026258 PMAQI
3rd Jul 2026299 PMAQI
3rd Jul 20262610 PMAQI
3rd Jul 20262411 PMAQI
4th Jul 20262812 AMAQI
4th Jul 2026281 AMAQI
4th Jul 2026222 AMAQI
4th Jul 2026233 AMAQI
4th Jul 2026204 AMAQI

31°C24/39°C

4th Jul 2026205 AMAQI
4th Jul 2026226 AMAQI
4th Jul 2026187 AMAQI
4th Jul 2026188 AMAQI
4th Jul 2026229 AMAQI
4th Jul 20261410 AMAQI
4th Jul 20262011 AMAQI
4th Jul 20261712 PMAQI
4th Jul 2026141 PMAQI
4th Jul 2026152 PMAQI
4th Jul 2026163 PMAQI
4th Jul 2026204 PMAQI
4th Jul 2026205 PMAQI
4th Jul 2026166 PMAQI
4th Jul 2026237 PMAQI
4th Jul 2026238 PMAQI
4th Jul 2026259 PMAQI
4th Jul 20263610 PMAQI
4th Jul 20264411 PMAQI
5th Jul 20264812 AMAQI
5th Jul 2026551 AMAQI
5th Jul 2026312 AMAQI
5th Jul 2026123 AMAQI
5th Jul 2026344 AMAQI

30°C24/37°C

5th Jul 2026335 AMAQI
5th Jul 2026226 AMAQI
5th Jul 2026147 AMAQI
5th Jul 2026268 AMAQI
5th Jul 2026249 AMAQI
5th Jul 20261510 AMAQI
5th Jul 20261411 AMAQI
5th Jul 20263012 PMAQI
5th Jul 2026291 PMAQI
5th Jul 2026292 PMAQI
5th Jul 2026263 PMAQI
5th Jul 2026284 PMAQI
5th Jul 2026285 PMAQI
5th Jul 2026306 PMAQI
5th Jul 2026307 PMAQI
5th Jul 2026198 PMAQI
5th Jul 2026199 PMAQI
5th Jul 20263410 PMAQI
5th Jul 20264911 PMAQI
6th Jul 20265412 AMAQI
6th Jul 2026381 AMAQI
6th Jul 2026382 AMAQI
6th Jul 2026473 AMAQI
6th Jul 2026184 AMAQI

24°C21/28°C

6th Jul 2026425 AMAQI
6th Jul 2026236 AMAQI
6th Jul 2026167 AMAQI
6th Jul 2026268 AMAQI
6th Jul 2026299 AMAQI
6th Jul 20261510 AMAQI
6th Jul 20262411 AMAQI
6th Jul 20262212 PMAQI
6th Jul 2026131 PMAQI
6th Jul 2026162 PMAQI
6th Jul 2026163 PMAQI
6th Jul 2026304 PMAQI
6th Jul 2026105 PMAQI
6th Jul 2026246 PMAQI
6th Jul 2026207 PMAQI
6th Jul 2026188 PMAQI
6th Jul 2026129 PMAQI
6th Jul 20261310 PMAQI
6th Jul 20262111 PMAQI
7th Jul 20261312 AMAQI
7th Jul 2026171 AMAQI
7th Jul 2026162 AMAQI
7th Jul 2026103 AMAQI
7th Jul 2026104 AMAQI

20°C17/24°C

7th Jul 2026165 AMAQI
7th Jul 2026146 AMAQI
7th Jul 2026107 AMAQI
7th Jul 2026178 AMAQI
7th Jul 2026129 AMAQI
7th Jul 20261410 AMAQI
7th Jul 20261211 AMAQI
7th Jul 2026812 PMAQI
7th Jul 2026121 PMAQI
7th Jul 2026122 PMAQI
7th Jul 2026123 PMAQI
7th Jul 2026124 PMAQI
7th Jul 2026125 PMAQI
7th Jul 2026126 PMAQI
7th Jul 202687 PMAQI
7th Jul 202688 PMAQI
7th Jul 2026129 PMAQI
7th Jul 20261210 PMAQI
7th Jul 20261711 PMAQI
8th Jul 20261212 AMAQI
8th Jul 2026211 AMAQI
8th Jul 2026212 AMAQI
8th Jul 2026213 AMAQI
8th Jul 2026244 AMAQI

19°C17/22°C

8th Jul 2026165 AMAQI
8th Jul 2026186 AMAQI
8th Jul 202687 AMAQI
8th Jul 2026158 AMAQI
8th Jul 2026219 AMAQI
8th Jul 20261810 AMAQI
8th Jul 20261011 AMAQI
8th Jul 20261012 PMAQI
8th Jul 2026101 PMAQI
8th Jul 2026252 PMAQI
8th Jul 2026203 PMAQI
8th Jul 2026204 PMAQI
8th Jul 2026215 PMAQI
8th Jul 2026196 PMAQI
8th Jul 2026297 PMAQI
8th Jul 2026298 PMAQI
8th Jul 2026109 PMAQI
8th Jul 20261110 PMAQI
8th Jul 20261011 PMAQI
9th Jul 20261012 AMAQI
9th Jul 2026101 AMAQI
9th Jul 2026292 AMAQI
9th Jul 2026253 AMAQI
9th Jul 2026124 AMAQI

22°C17/29°C

9th Jul 2026275 AMAQI
9th Jul 2026216 AMAQI
9th Jul 2026267 AMAQI
9th Jul 2026178 AMAQI
9th Jul 202699 AMAQI
9th Jul 20261710 AMAQI
9th Jul 20261311 AMAQI
9th Jul 20261012 PMAQI
9th Jul 2026131 PMAQI
9th Jul 2026182 PMAQI
9th Jul 2026183 PMAQI
9th Jul 2026204 PMAQI
9th Jul 2026255 PMAQI
9th Jul 2026186 PMAQI
9th Jul 2026257 PMAQI
9th Jul 2026148 PMAQI
9th Jul 2026219 PMAQI
9th Jul 20262110 PMAQI
9th Jul 20261711 PMAQI
10th Jul 20261312 AMAQI
10th Jul 2026171 AMAQI
10th Jul 2026172 AMAQI
10th Jul 2026123 AMAQI
10th Jul 2026174 AMAQI

24°C18/32°C

10th Jul 2026165 AMAQI
10th Jul 2026216 AMAQI
10th Jul 2026167 AMAQI
10th Jul 2026258 AMAQI
10th Jul 2026259 AMAQI
10th Jul 20262510 AMAQI
10th Jul 20262111 AMAQI
10th Jul 20261712 PMAQI
10th Jul 2026131 PMAQI
10th Jul 2026142 PMAQI
10th Jul 202683 PMAQI
10th Jul 2026104 PMAQI
10th Jul 2026125 PMAQI
10th Jul 2026126 PMAQI
10th Jul 2026247 PMAQI
10th Jul 2026108 PMAQI
10th Jul 2026129 PMAQI
10th Jul 20261210 PMAQI
10th Jul 20261711 PMAQI
11th Jul 20261312 AMAQI
11th Jul 2026161 AMAQI
11th Jul 2026132 AMAQI
11th Jul 2026253 AMAQI
11th Jul 2026174 AMAQI

27°C22/33°C

11th Jul 2026205 AMAQI
11th Jul 2026296 AMAQI
11th Jul 2026177 AMAQI
11th Jul 2026148 AMAQI
11th Jul 2026159 AMAQI
11th Jul 20261410 AMAQI
11th Jul 20261411 AMAQI
11th Jul 20262612 PMAQI
11th Jul 2026141 PMAQI
11th Jul 2026382 PMAQI
11th Jul 2026143 PMAQI
11th Jul 2026304 PMAQI
11th Jul 2026265 PMAQI
11th Jul 2026386 PMAQI
11th Jul 2026287 PMAQI
11th Jul 2026268 PMAQI
11th Jul 2026249 PMAQI
11th Jul 20262410 PMAQI
11th Jul 20262411 PMAQI
12th Jul 20261812 AMAQI
12th Jul 2026281 AMAQI
12th Jul 2026292 AMAQI
12th Jul 2026143 AMAQI
12th Jul 2026144 AMAQI

25°C19/31°C

12th Jul 2026275 AMAQI
12th Jul 2026166 AMAQI
12th Jul 2026367 AMAQI
12th Jul 2026228 AMAQI
12th Jul 2026159 AMAQI
12th Jul 20262010 AMAQI
12th Jul 20263111 AMAQI
12th Jul 20262412 PMAQI
12th Jul 2026201 PMAQI
12th Jul 2026142 PMAQI
12th Jul 2026163 PMAQI
12th Jul 2026184 PMAQI
12th Jul 2026145 PMAQI
12th Jul 2026166 PMAQI
12th Jul 2026187 PMAQI
12th Jul 2026148 PMAQI
12th Jul 2026219 PMAQI
12th Jul 20262010 PMAQI
12th Jul 20262111 PMAQI
13th Jul 20261812 AMAQI
13th Jul 2026111 AMAQI
13th Jul 2026202 AMAQI
13th Jul 2026193 AMAQI
13th Jul 2026184 AMAQI

23°C16/32°C

13th Jul 2026235 AMAQI
13th Jul 2026206 AMAQI
13th Jul 2026107 AMAQI
13th Jul 2026188 AMAQI
13th Jul 2026189 AMAQI
13th Jul 20261010 AMAQI
13th Jul 20261811 AMAQI
13th Jul 20261812 PMAQI
13th Jul 2026221 PMAQI
13th Jul 2026332 PMAQI
13th Jul 2026183 PMAQI
13th Jul 2026124 PMAQI
13th Jul 2026325 PMAQI
13th Jul 2026126 PMAQI
13th Jul 2026317 PMAQI
13th Jul 2026248 PMAQI
13th Jul 2026299 PMAQI
13th Jul 20261210 PMAQI
13th Jul 20261311 PMAQI
14th Jul 20262912 AMAQI
14th Jul 2026201 AMAQI
14th Jul 2026182 AMAQI
14th Jul 2026293 AMAQI
14th Jul 2026204 AMAQI

23°C16/31°C

14th Jul 2026185 AMAQI
14th Jul 2026126 AMAQI
14th Jul 2026237 AMAQI
14th Jul 2026238 AMAQI
14th Jul 2026129 AMAQI
14th Jul 20261210 AMAQI
14th Jul 20261411 AMAQI
14th Jul 20261512 PMAQI
14th Jul 2026161 PMAQI
14th Jul 2026282 PMAQI
14th Jul 2026183 PMAQI
14th Jul 2026184 PMAQI
14th Jul 2026205 PMAQI
14th Jul 2026276 PMAQI
14th Jul 2026207 PMAQI
14th Jul 2026298 PMAQI
14th Jul 2026269 PMAQI
14th Jul 20262210 PMAQI
14th Jul 20262211 PMAQI
15th Jul 20262012 AMAQI
15th Jul 2026221 AMAQI
15th Jul 2026202 AMAQI
15th Jul 2026343 AMAQI
15th Jul 2026324 AMAQI

27°C21/34°C

15th Jul 2026365 AMAQI
15th Jul 2026346 AMAQI
15th Jul 2026327 AMAQI
15th Jul 2026188 AMAQI
15th Jul 2026199 AMAQI
15th Jul 20262010 AMAQI
15th Jul 20264411 AMAQI
15th Jul 20267612 PMAQI
15th Jul 2026491 PMAQI
15th Jul 2026252 PMAQI
15th Jul 2026563 PMAQI
15th Jul 2026554 PMAQI
15th Jul 2026855 PMAQI
15th Jul 2026786 PMAQI
15th Jul 2026567 PMAQI
15th Jul 2026468 PMAQI
15th Jul 2026769 PMAQI
15th Jul 20264610 PMAQI
15th Jul 20264311 PMAQI
16th Jul 20265212 AMAQI
16th Jul 2026401 AMAQI
16th Jul 2026682 AMAQI
16th Jul 2026343 AMAQI
16th Jul 2026364 AMAQI

28°C22/35°C

16th Jul 2026405 AMAQI
16th Jul 2026416 AMAQI
16th Jul 2026367 AMAQI
16th Jul 2026388 AMAQI
16th Jul 2026369 AMAQI
16th Jul 20264010 AMAQI
16th Jul 20263211 AMAQI
16th Jul 20263212 PMAQI
16th Jul 2026401 PMAQI
16th Jul 2026312 PMAQI
16th Jul 2026603 PMAQI
16th Jul 2026704 PMAQI
16th Jul 2026425 PMAQI
16th Jul 2026416 PMAQI
16th Jul 2026777 PMAQI
16th Jul 2026918 PMAQI
16th Jul 2026899 PMAQI
16th Jul 20269210 PMAQI
16th Jul 20268111 PMAQI
17th Jul 202611612 AMAQI
17th Jul 2026921 AMAQI
17th Jul 2026942 AMAQI
17th Jul 20261023 AMAQI
17th Jul 2026934 AMAQI

26°C20/33°C

17th Jul 20261555 AMAQI
5 AM
17th Jul 20261526 AMAQI
17th Jul 20261297 AMAQI
17th Jul 20261228 AMAQI
17th Jul 20261149 AMAQI
17th Jul 20269410 AMAQI
17th Jul 20267811 AMAQI
17th Jul 20266612 PMAQI
12 PM
17th Jul 2026621 PMAQI
17th Jul 2026542 PMAQI
17th Jul 2026503 PMAQI
17th Jul 2026424 PMAQI
17th Jul 2026385 PMAQI
17th Jul 2026346 PMAQI
17th Jul 2026407 PMAQI
17th Jul 2026408 PMAQI
8 PM
17th Jul 2026369 PMAQI
17th Jul 20263810 PMAQI
17th Jul 20264211 PMAQI
12 AM
4 AM

25°C17/32°C

Day time
Avg. Highest Time
5 AM

26AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
11 AM

21AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 5 AM (Avg. 26), while the lowest AQI was between 11 AM to 11 AM (Avg. 21).
Night time
Avg. Highest Time
1 AM - 2 AM

25AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
4 AM

22AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 AM to 2 AM (Avg. 25), while the lowest AQI was between 4 AM to 4 AM (Avg. 22).

2026 Days Vs Air Quality

Fort Griswold Battlefield State Park, Groton, Connecticut, United States

2026

98%

191

2%

4

Total number of days with different AQI categories in last 198 days in 2026 (167 days remaining)

Good
191 Days
Moderate
4 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 98%

Health Risk Level:

Very Low

In 2026, 98% of 198 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.

Annual Air Quality Insights

Fort Griswold Battlefield State Park, Groton, Connecticut, United States

AQI levels in 2026

AQI (US)
PM₂.₅
PM₁₀
CO
SO₂
NO₂
O₃
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
19AQI (US)
2nd January 2026
18AQI (US)
3rd January 2026
24AQI (US)
4th January 2026
21AQI (US)
5th January 2026
21AQI (US)
6th January 2026
45AQI (US)
7th January 2026
30AQI (US)
8th January 2026
18AQI (US)
9th January 2026
25AQI (US)
10th January 2026
21AQI (US)
11th January 2026
13AQI (US)
12th January 2026
12AQI (US)
13th January 2026
29AQI (US)
14th January 2026
38AQI (US)
15th January 2026
33AQI (US)
16th January 2026
14AQI (US)
17th January 2026
30AQI (US)
18th January 2026
49AQI (US)
19th January 2026
28AQI (US)
20th January 2026
28AQI (US)
21st January 2026
27AQI (US)
22nd January 2026
35AQI (US)
23rd January 2026
33AQI (US)
24th January 2026
46AQI (US)
25th January 2026
31AQI (US)
26th January 2026
36AQI (US)
27th January 2026
30AQI (US)
28th January 2026
23AQI (US)
29th January 2026
29AQI (US)
30th January 2026
45AQI (US)
31st January 2026
26AQI (US)
1st February 2026
28AQI (US)
2nd February 2026
28AQI (US)
3rd February 2026
23AQI (US)
4th February 2026
21AQI (US)
5th February 2026
28AQI (US)
6th February 2026
36AQI (US)
7th February 2026
25AQI (US)
8th February 2026
22AQI (US)
9th February 2026
25AQI (US)
10th February 2026
24AQI (US)
11th February 2026
35AQI (US)
12th February 2026
32AQI (US)
13th February 2026
33AQI (US)
14th February 2026
30AQI (US)
15th February 2026
29AQI (US)
16th February 2026
29AQI (US)
17th February 2026
40AQI (US)
18th February 2026
38AQI (US)
19th February 2026
26AQI (US)
20th February 2026
26AQI (US)
21st February 2026
35AQI (US)
22nd February 2026
30AQI (US)
23rd February 2026
38AQI (US)
24th February 2026
36AQI (US)
25th February 2026
28AQI (US)
26th February 2026
29AQI (US)
27th February 2026
19AQI (US)
28th February 2026
19AQI (US)
1st March 2026
30AQI (US)
2nd March 2026
41AQI (US)
3rd March 2026
22AQI (US)
4th March 2026
24AQI (US)
5th March 2026
28AQI (US)
6th March 2026
37AQI (US)
7th March 2026
18AQI (US)
8th March 2026
19AQI (US)
9th March 2026
15AQI (US)
10th March 2026
18AQI (US)
11th March 2026
28AQI (US)
12th March 2026
32AQI (US)
13th March 2026
27AQI (US)
14th March 2026
20AQI (US)
15th March 2026
32AQI (US)
16th March 2026
26AQI (US)
17th March 2026
33AQI (US)
18th March 2026
28AQI (US)
19th March 2026
20AQI (US)
20th March 2026
25AQI (US)
21st March 2026
29AQI (US)
22nd March 2026
16AQI (US)
23rd March 2026
35AQI (US)
24th March 2026
33AQI (US)
25th March 2026
22AQI (US)
26th March 2026
18AQI (US)
27th March 2026
30AQI (US)
28th March 2026
27AQI (US)
29th March 2026
16AQI (US)
30th March 2026
19AQI (US)
31st March 2026
26AQI (US)
1st April 2026
31AQI (US)
2nd April 2026
33AQI (US)
3rd April 2026
23AQI (US)
4th April 2026
27AQI (US)
5th April 2026
27AQI (US)
6th April 2026
29AQI (US)
7th April 2026
23AQI (US)
8th April 2026
34AQI (US)
9th April 2026
17AQI (US)
10th April 2026
20AQI (US)
11th April 2026
32AQI (US)
12th April 2026
22AQI (US)
13th April 2026
22AQI (US)
14th April 2026
24AQI (US)
15th April 2026
20AQI (US)
16th April 2026
24AQI (US)
17th April 2026
18th April 2026
27AQI (US)
19th April 2026
31AQI (US)
20th April 2026
27AQI (US)
21st April 2026
23AQI (US)
22nd April 2026
23rd April 2026
17AQI (US)
24th April 2026
20AQI (US)
25th April 2026
14AQI (US)
26th April 2026
32AQI (US)
27th April 2026
23AQI (US)
28th April 2026
19AQI (US)
29th April 2026
16AQI (US)
30th April 2026
19AQI (US)
1st May 2026
25AQI (US)
2nd May 2026
13AQI (US)
3rd May 2026
20AQI (US)
4th May 2026
23AQI (US)
5th May 2026
30AQI (US)
6th May 2026
23AQI (US)
7th May 2026
26AQI (US)
8th May 2026
25AQI (US)
9th May 2026
10th May 2026
17AQI (US)
11th May 2026
28AQI (US)
12th May 2026
31AQI (US)
13th May 2026
19AQI (US)
14th May 2026
19AQI (US)
15th May 2026
40AQI (US)
16th May 2026
39AQI (US)
17th May 2026
50AQI (US)
18th May 2026
54AQI (US)
19th May 2026
54AQI (US)
20th May 2026
49AQI (US)
21st May 2026
40AQI (US)
22nd May 2026
37AQI (US)
23rd May 2026
41AQI (US)
24th May 2026
44AQI (US)
25th May 2026
45AQI (US)
26th May 2026
19AQI (US)
27th May 2026
15AQI (US)
28th May 2026
16AQI (US)
29th May 2026
16AQI (US)
30th May 2026
16AQI (US)
31st May 2026
18AQI (US)
1st June 2026
23AQI (US)
2nd June 2026
16AQI (US)
3rd June 2026
15AQI (US)
4th June 2026
17AQI (US)
5th June 2026
23AQI (US)
6th June 2026
24AQI (US)
7th June 2026
14AQI (US)
8th June 2026
18AQI (US)
9th June 2026
14AQI (US)
10th June 2026
18AQI (US)
11th June 2026
21AQI (US)
12th June 2026
14AQI (US)
13th June 2026
14AQI (US)
14th June 2026
16AQI (US)
15th June 2026
20AQI (US)
16th June 2026
24AQI (US)
17th June 2026
16AQI (US)
18th June 2026
24AQI (US)
19th June 2026
15AQI (US)
20th June 2026
15AQI (US)
21st June 2026
19AQI (US)
22nd June 2026
14AQI (US)
23rd June 2026
17AQI (US)
24th June 2026
12AQI (US)
25th June 2026
12AQI (US)
26th June 2026
18AQI (US)
27th June 2026
20AQI (US)
28th June 2026
15AQI (US)
29th June 2026
18AQI (US)
30th June 2026
23AQI (US)
1st July 2026
20AQI (US)
2nd July 2026
30AQI (US)
3rd July 2026
30AQI (US)
4th July 2026
22AQI (US)
5th July 2026
28AQI (US)
6th July 2026
24AQI (US)
7th July 2026
12AQI (US)
8th July 2026
17AQI (US)
9th July 2026
18AQI (US)
10th July 2026
16AQI (US)
11th July 2026
22AQI (US)
12th July 2026
20AQI (US)
13th July 2026
19AQI (US)
14th July 2026
20AQI (US)
15th July 2026
43AQI (US)
16th July 2026
52AQI (US)
17th July 2026
78AQI (US)
18th July 2026
19th July 2026
20th July 2026
21st July 2026
22nd July 2026
23rd July 2026
24th July 2026
25th July 2026
26th July 2026
27th July 2026
28th July 2026
29th July 2026
30th July 2026
31st July 2026
1st August 2026
2nd August 2026
3rd August 2026
4th August 2026
5th August 2026
6th August 2026
7th August 2026
8th August 2026
9th August 2026
10th August 2026
11th August 2026
12th August 2026
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

28AQI (US)

29AQI (US)

26AQI (US)

24AQI (US)

30AQI (US)

18AQI (US)

28AQI (US)

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202626AQI (US)

31
28
31
28
28
2
30
15
2
191
4

Highest AQI (US) recorded in

May

30AQI (US)

Lowest AQI (US) recorded in

June

18AQI (US)

202529AQI (US)

27
4
28
31
29
1
30
1
18
12
23
8
25
6
30
29
2
30
30
1
330
35

Highest AQI (US) recorded in

June

40AQI (US)

Lowest AQI (US) recorded in

October

21AQI (US)

202424AQI (US)

31
29
31
30
31
30
28
2
26
5
30
30
1
30
30
1
356
9

Highest AQI (US) recorded in

August

34AQI (US)

Lowest AQI (US) recorded in

March

19AQI (US)

202331AQI (US)

28
3
27
1
30
1
28
2
31
22
4
3
1
23
7
1
26
5
24
6
27
3
1
28
1
29
2
323
35
5
1

Highest AQI (US) recorded in

June

48AQI (US)

Lowest AQI (US) recorded in

November

23AQI (US)

202227AQI (US)

26
4
20
1
30
1
29
1
30
1
30
19
4
1
29
31
29
1
30
1
304
14

Highest AQI (US) recorded in

July

35AQI (US)

Lowest AQI (US) recorded in

April

22AQI (US)

202130AQI (US)

25
4
24
4
30
1
29
1
31
28
2
25
5
1
29
2
30
31
28
2
25
4
335
25
1

Highest AQI (US) recorded in

July

42AQI (US)

Lowest AQI (US) recorded in

May

24AQI (US)

202030AQI (US)

16
2
18
30
31
31
28
2
28
2
1
26
4
26
5
234
15
1

Highest AQI (US) recorded in

July

34AQI (US)

Lowest AQI (US) recorded in

September

24AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
31AQI (US)
Least Polluted Year Recorded
2024(Avg.)
24AQI (US)

Fort Griswold Battlefield State Park's annual 2026 AQI (US) (26) shows an average percentage change of -8.08% (improved AQI (US)) compared to previous years: 2020 (30), 2021 (30), 2022 (27), 2023 (31), 2024 (24), 2025 (29).