Chelsea, Massachusetts, 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+
August Air Quality Analysis
Chelsea, Massachusetts, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
5th Aug 2025
82AQILowest AQI recorded on
20th Aug 2024
15AQISame Day Analysis (9th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 33 of Good air quality, showing improvement over 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 9th Aug - 10th Aug 2025
Chelsea, Massachusetts, United States
AQI
Day
Night
.
5 AM9th Aug 2025
8 PM
4 AM10th Aug 2025
Day time
Avg. Highest Time
12PM9th Aug
35AQI
Avg. Lowest Time
6PM9th Aug
32AQI
Night time
Avg. Highest Time
11PM9th Aug
34AQI
Avg. Lowest Time
4AM10th Aug
30AQI
In the last 24 hours,
Chelsea's AQI reached its highest point of 35 at 12 PM during the Day, while the lowest point, 30, was recorded at 4 AM during the Night between 9th Aug and 10th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Chelsea, Massachusetts, United States
JulAug
11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th
Day
Night
11th Jul 2025345 AMAQI
11th Jul 2025336 AMAQI
11th Jul 2025337 AMAQI
11th Jul 2025348 AMAQI
11th Jul 2025369 AMAQI
11th Jul 20253510 AMAQI
11th Jul 20253411 AMAQI
11th Jul 20253112 PMAQI
11th Jul 2025331 PMAQI
11th Jul 2025332 PMAQI
11th Jul 2025333 PMAQI
11th Jul 2025354 PMAQI
11th Jul 2025325 PMAQI
11th Jul 2025306 PMAQI
11th Jul 2025327 PMAQI
11th Jul 2025328 PMAQI
11th Jul 2025329 PMAQI
11th Jul 20253310 PMAQI
11th Jul 20253411 PMAQI
12th Jul 20253412 AMAQI
12th Jul 2025311 AMAQI
12th Jul 2025282 AMAQI
12th Jul 2025343 AMAQI
12th Jul 2025354 AMAQI
20°C18/24°C
12th Jul 2025365 AMAQI
12th Jul 2025366 AMAQI
12th Jul 2025367 AMAQI
12th Jul 2025378 AMAQI
12th Jul 2025369 AMAQI
12th Jul 20253610 AMAQI
12th Jul 20253611 AMAQI
12th Jul 20253612 PMAQI
12th Jul 2025361 PMAQI
12th Jul 2025332 PMAQI
12th Jul 2025323 PMAQI
12th Jul 2025324 PMAQI
12th Jul 2025315 PMAQI
12th Jul 2025306 PMAQI
12th Jul 2025327 PMAQI
12th Jul 2025338 PMAQI
12th Jul 2025299 PMAQI
12th Jul 20253010 PMAQI
12th Jul 20253111 PMAQI
13th Jul 20252912 AMAQI
13th Jul 2025301 AMAQI
13th Jul 2025222 AMAQI
13th Jul 2025223 AMAQI
13th Jul 2025224 AMAQI
21°C20/24°C
13th Jul 2025235 AMAQI
13th Jul 2025196 AMAQI
13th Jul 2025227 AMAQI
13th Jul 2025218 AMAQI
13th Jul 2025229 AMAQI
13th Jul 20252210 AMAQI
13th Jul 20252211 AMAQI
13th Jul 20252212 PMAQI
13th Jul 2025221 PMAQI
13th Jul 2025212 PMAQI
13th Jul 2025223 PMAQI
13th Jul 2025234 PMAQI
13th Jul 2025245 PMAQI
13th Jul 2025256 PMAQI
13th Jul 2025247 PMAQI
13th Jul 2025248 PMAQI
13th Jul 2025259 PMAQI
13th Jul 20252510 PMAQI
13th Jul 20252411 PMAQI
14th Jul 20252312 AMAQI
14th Jul 2025231 AMAQI
14th Jul 2025212 AMAQI
14th Jul 2025213 AMAQI
14th Jul 2025234 AMAQI
21°C18/24°C
14th Jul 2025235 AMAQI
14th Jul 2025256 AMAQI
14th Jul 2025247 AMAQI
14th Jul 2025248 AMAQI
14th Jul 2025249 AMAQI
14th Jul 20252310 AMAQI
14th Jul 20252411 AMAQI
14th Jul 20252312 PMAQI
14th Jul 2025251 PMAQI
14th Jul 2025272 PMAQI
14th Jul 2025263 PMAQI
14th Jul 2025274 PMAQI
14th Jul 2025275 PMAQI
14th Jul 2025286 PMAQI
14th Jul 2025277 PMAQI
14th Jul 2025268 PMAQI
14th Jul 2025299 PMAQI
14th Jul 20252810 PMAQI
14th Jul 20252811 PMAQI
15th Jul 20252812 AMAQI
15th Jul 2025281 AMAQI
15th Jul 2025252 AMAQI
15th Jul 2025273 AMAQI
15th Jul 2025294 AMAQI
22°C19/26°C
15th Jul 2025265 AMAQI
15th Jul 2025246 AMAQI
15th Jul 2025237 AMAQI
15th Jul 2025248 AMAQI
15th Jul 2025249 AMAQI
15th Jul 20252510 AMAQI
15th Jul 20252811 AMAQI
15th Jul 20253212 PMAQI
15th Jul 2025351 PMAQI
15th Jul 2025352 PMAQI
15th Jul 2025313 PMAQI
15th Jul 2025314 PMAQI
15th Jul 2025315 PMAQI
15th Jul 2025316 PMAQI
15th Jul 2025317 PMAQI
15th Jul 2025318 PMAQI
15th Jul 2025319 PMAQI
15th Jul 20253210 PMAQI
15th Jul 20253111 PMAQI
16th Jul 20253012 AMAQI
16th Jul 2025291 AMAQI
16th Jul 2025272 AMAQI
16th Jul 2025263 AMAQI
16th Jul 2025304 AMAQI
26°C22/33°C
16th Jul 2025305 AMAQI
16th Jul 2025316 AMAQI
16th Jul 2025327 AMAQI
16th Jul 2025358 AMAQI
16th Jul 2025389 AMAQI
16th Jul 20254610 AMAQI
16th Jul 20255111 AMAQI
16th Jul 20254812 PMAQI
16th Jul 2025441 PMAQI
16th Jul 2025432 PMAQI
16th Jul 2025403 PMAQI
16th Jul 2025444 PMAQI
16th Jul 2025445 PMAQI
16th Jul 2025436 PMAQI
16th Jul 2025427 PMAQI
16th Jul 2025418 PMAQI
16th Jul 2025439 PMAQI
16th Jul 20254210 PMAQI
16th Jul 20254011 PMAQI
17th Jul 20254112 AMAQI
17th Jul 2025371 AMAQI
17th Jul 2025362 AMAQI
17th Jul 2025353 AMAQI
17th Jul 2025394 AMAQI
26°C22/31°C
17th Jul 2025415 AMAQI
17th Jul 2025446 AMAQI
17th Jul 2025437 AMAQI
17th Jul 2025448 AMAQI
17th Jul 2025459 AMAQI
17th Jul 20254910 AMAQI
17th Jul 20254611 AMAQI
17th Jul 20254512 PMAQI
17th Jul 2025411 PMAQI
17th Jul 2025362 PMAQI
17th Jul 2025363 PMAQI
17th Jul 2025374 PMAQI
17th Jul 2025365 PMAQI
17th Jul 2025356 PMAQI
17th Jul 2025377 PMAQI
17th Jul 2025398 PMAQI
17th Jul 2025399 PMAQI
17th Jul 20253910 PMAQI
17th Jul 20253811 PMAQI
18th Jul 20253712 AMAQI
18th Jul 2025371 AMAQI
18th Jul 2025222 AMAQI
18th Jul 2025203 AMAQI
18th Jul 2025194 AMAQI
26°C22/31°C
18th Jul 2025185 AMAQI
18th Jul 2025206 AMAQI
18th Jul 2025207 AMAQI
18th Jul 2025198 AMAQI
18th Jul 2025189 AMAQI
18th Jul 20251710 AMAQI
18th Jul 20251511 AMAQI
18th Jul 20251512 PMAQI
18th Jul 2025151 PMAQI
18th Jul 2025172 PMAQI
18th Jul 2025193 PMAQI
18th Jul 2025194 PMAQI
18th Jul 2025195 PMAQI
18th Jul 2025206 PMAQI
18th Jul 2025197 PMAQI
18th Jul 2025198 PMAQI
18th Jul 2025209 PMAQI
18th Jul 20252010 PMAQI
18th Jul 20252011 PMAQI
19th Jul 20252112 AMAQI
19th Jul 2025221 AMAQI
19th Jul 2025262 AMAQI
19th Jul 2025293 AMAQI
19th Jul 2025284 AMAQI
24°C21/28°C
19th Jul 2025285 AMAQI
19th Jul 2025276 AMAQI
19th Jul 2025287 AMAQI
19th Jul 2025288 AMAQI
19th Jul 2025289 AMAQI
19th Jul 20253110 AMAQI
19th Jul 20253011 AMAQI
19th Jul 20253112 PMAQI
19th Jul 2025281 PMAQI
19th Jul 2025292 PMAQI
19th Jul 2025273 PMAQI
19th Jul 2025274 PMAQI
19th Jul 2025265 PMAQI
19th Jul 2025266 PMAQI
19th Jul 2025267 PMAQI
19th Jul 2025268 PMAQI
19th Jul 2025279 PMAQI
19th Jul 20252610 PMAQI
19th Jul 20252611 PMAQI
20th Jul 20252512 AMAQI
20th Jul 2025231 AMAQI
20th Jul 2025182 AMAQI
20th Jul 2025173 AMAQI
20th Jul 2025164 AMAQI
23°C17/28°C
20th Jul 2025165 AMAQI
20th Jul 2025176 AMAQI
20th Jul 2025177 AMAQI
20th Jul 2025188 AMAQI
20th Jul 2025199 AMAQI
20th Jul 20252010 AMAQI
20th Jul 20252011 AMAQI
20th Jul 20252012 PMAQI
20th Jul 2025201 PMAQI
20th Jul 2025222 PMAQI
20th Jul 2025223 PMAQI
20th Jul 2025244 PMAQI
20th Jul 2025245 PMAQI
20th Jul 2025256 PMAQI
20th Jul 2025227 PMAQI
20th Jul 2025228 PMAQI
20th Jul 2025249 PMAQI
20th Jul 20252410 PMAQI
20th Jul 20252411 PMAQI
21st Jul 20252412 AMAQI
21st Jul 2025241 AMAQI
21st Jul 2025202 AMAQI
21st Jul 2025193 AMAQI
21st Jul 2025204 AMAQI
24°C20/31°C
21st Jul 2025235 AMAQI
21st Jul 2025306 AMAQI
21st Jul 2025317 AMAQI
21st Jul 2025368 AMAQI
21st Jul 2025479 AMAQI
21st Jul 20255410 AMAQI
21st Jul 20255611 AMAQI
21st Jul 20255512 PMAQI
21st Jul 2025551 PMAQI
21st Jul 2025492 PMAQI
21st Jul 2025433 PMAQI
21st Jul 2025344 PMAQI
21st Jul 2025275 PMAQI
21st Jul 2025246 PMAQI
21st Jul 2025247 PMAQI
21st Jul 2025258 PMAQI
21st Jul 2025219 PMAQI
21st Jul 20252210 PMAQI
21st Jul 20252211 PMAQI
22nd Jul 20252312 AMAQI
22nd Jul 2025231 AMAQI
22nd Jul 2025182 AMAQI
22nd Jul 2025163 AMAQI
22nd Jul 2025174 AMAQI
23°C19/27°C
22nd Jul 2025175 AMAQI
22nd Jul 2025186 AMAQI
22nd Jul 2025187 AMAQI
22nd Jul 2025188 AMAQI
22nd Jul 2025199 AMAQI
22nd Jul 20252110 AMAQI
22nd Jul 20251911 AMAQI
22nd Jul 20251712 PMAQI
22nd Jul 2025181 PMAQI
22nd Jul 2025182 PMAQI
22nd Jul 2025193 PMAQI
22nd Jul 2025184 PMAQI
22nd Jul 2025185 PMAQI
22nd Jul 2025186 PMAQI
22nd Jul 2025197 PMAQI
22nd Jul 2025208 PMAQI
22nd Jul 2025209 PMAQI
22nd Jul 20252010 PMAQI
22nd Jul 20252111 PMAQI
23rd Jul 20252112 AMAQI
23rd Jul 2025211 AMAQI
23rd Jul 2025212 AMAQI
23rd Jul 2025213 AMAQI
23rd Jul 2025224 AMAQI
21°C15/26°C
23rd Jul 2025275 AMAQI
23rd Jul 2025226 AMAQI
23rd Jul 2025217 AMAQI
23rd Jul 2025248 AMAQI
23rd Jul 2025269 AMAQI
23rd Jul 20252810 AMAQI
23rd Jul 20252811 AMAQI
23rd Jul 20252912 PMAQI
23rd Jul 2025291 PMAQI
23rd Jul 2025302 PMAQI
23rd Jul 2025263 PMAQI
23rd Jul 2025264 PMAQI
23rd Jul 2025265 PMAQI
23rd Jul 2025276 PMAQI
23rd Jul 2025267 PMAQI
23rd Jul 2025278 PMAQI
23rd Jul 2025269 PMAQI
23rd Jul 20252510 PMAQI
23rd Jul 20252511 PMAQI
24th Jul 20252412 AMAQI
24th Jul 2025241 AMAQI
24th Jul 2025222 AMAQI
24th Jul 2025233 AMAQI
24th Jul 2025224 AMAQI
22°C18/26°C
24th Jul 2025225 AMAQI
24th Jul 2025226 AMAQI
24th Jul 2025227 AMAQI
24th Jul 2025238 AMAQI
24th Jul 2025249 AMAQI
24th Jul 20252910 AMAQI
24th Jul 20253111 AMAQI
24th Jul 20253412 PMAQI
24th Jul 2025381 PMAQI
24th Jul 2025402 PMAQI
24th Jul 2025403 PMAQI
24th Jul 2025414 PMAQI
24th Jul 2025415 PMAQI
24th Jul 2025426 PMAQI
24th Jul 2025297 PMAQI
24th Jul 2025298 PMAQI
24th Jul 2025349 PMAQI
24th Jul 20253110 PMAQI
24th Jul 20253011 PMAQI
25th Jul 20253012 AMAQI
25th Jul 2025301 AMAQI
25th Jul 2025262 AMAQI
25th Jul 2025283 AMAQI
25th Jul 2025314 AMAQI
25°C19/32°C
25th Jul 2025345 AMAQI
25th Jul 2025426 AMAQI
25th Jul 2025387 AMAQI
25th Jul 2025418 AMAQI
25th Jul 2025469 AMAQI
25th Jul 20255010 AMAQI
25th Jul 20255211 AMAQI
25th Jul 20255212 PMAQI
25th Jul 2025521 PMAQI
25th Jul 2025522 PMAQI
25th Jul 2025473 PMAQI
25th Jul 2025434 PMAQI
25th Jul 2025445 PMAQI
25th Jul 2025406 PMAQI
25th Jul 2025407 PMAQI
25th Jul 2025388 PMAQI
25th Jul 2025309 PMAQI
25th Jul 20253110 PMAQI
25th Jul 20253211 PMAQI
26th Jul 20253212 AMAQI
26th Jul 2025311 AMAQI
26th Jul 2025562 AMAQI
26th Jul 2025563 AMAQI
26th Jul 2025674 AMAQI
27°C21/33°C
26th Jul 20251075 AMAQI
26th Jul 20251286 AMAQI
26th Jul 20251287 AMAQI
26th Jul 20251278 AMAQI
26th Jul 20251189 AMAQI
26th Jul 202510310 AMAQI
26th Jul 20259511 AMAQI
26th Jul 20258912 PMAQI
26th Jul 2025781 PMAQI
26th Jul 2025752 PMAQI
26th Jul 2025813 PMAQI
26th Jul 2025724 PMAQI
26th Jul 2025675 PMAQI
26th Jul 2025706 PMAQI
26th Jul 2025677 PMAQI
26th Jul 2025668 PMAQI
26th Jul 2025669 PMAQI
26th Jul 20256910 PMAQI
26th Jul 20257111 PMAQI
27th Jul 20257112 AMAQI
27th Jul 2025731 AMAQI
27th Jul 2025802 AMAQI
27th Jul 2025863 AMAQI
27th Jul 2025864 AMAQI
23°C20/27°C
27th Jul 2025845 AMAQI
27th Jul 2025786 AMAQI
27th Jul 2025777 AMAQI
27th Jul 2025758 AMAQI
27th Jul 2025769 AMAQI
27th Jul 20257810 AMAQI
27th Jul 20257811 AMAQI
27th Jul 20258112 PMAQI
27th Jul 2025821 PMAQI
27th Jul 2025832 PMAQI
27th Jul 2025823 PMAQI
27th Jul 2025824 PMAQI
27th Jul 2025805 PMAQI
27th Jul 2025796 PMAQI
27th Jul 2025787 PMAQI
27th Jul 2025768 PMAQI
27th Jul 2025779 PMAQI
27th Jul 20257710 PMAQI
27th Jul 20257711 PMAQI
28th Jul 20257512 AMAQI
28th Jul 2025761 AMAQI
28th Jul 2025812 AMAQI
28th Jul 2025843 AMAQI
28th Jul 2025834 AMAQI
22°C18/25°C
28th Jul 2025785 AMAQI
28th Jul 2025756 AMAQI
28th Jul 2025737 AMAQI
28th Jul 2025728 AMAQI
28th Jul 2025749 AMAQI
28th Jul 20257110 AMAQI
28th Jul 20256811 AMAQI
28th Jul 20256612 PMAQI
28th Jul 2025641 PMAQI
28th Jul 2025652 PMAQI
28th Jul 2025673 PMAQI
28th Jul 2025674 PMAQI
28th Jul 2025665 PMAQI
28th Jul 2025666 PMAQI
28th Jul 2025707 PMAQI
28th Jul 2025668 PMAQI
28th Jul 2025639 PMAQI
28th Jul 20256410 PMAQI
28th Jul 20256311 PMAQI
29th Jul 20256412 AMAQI
29th Jul 2025641 AMAQI
29th Jul 2025592 AMAQI
29th Jul 2025603 AMAQI
29th Jul 2025604 AMAQI
23°C20/28°C
29th Jul 2025605 AMAQI
29th Jul 2025616 AMAQI
29th Jul 2025617 AMAQI
29th Jul 2025628 AMAQI
29th Jul 2025629 AMAQI
29th Jul 20256110 AMAQI
29th Jul 20256011 AMAQI
29th Jul 20256112 PMAQI
29th Jul 2025611 PMAQI
29th Jul 2025612 PMAQI
29th Jul 2025613 PMAQI
29th Jul 2025604 PMAQI
29th Jul 2025615 PMAQI
29th Jul 2025596 PMAQI
29th Jul 2025607 PMAQI
29th Jul 2025608 PMAQI
29th Jul 2025579 PMAQI
29th Jul 20255710 PMAQI
29th Jul 20255611 PMAQI
30th Jul 20255712 AMAQI
30th Jul 2025571 AMAQI
30th Jul 2025562 AMAQI
30th Jul 2025553 AMAQI
30th Jul 2025524 AMAQI
29°C22/36°C
30th Jul 2025505 AMAQI
30th Jul 2025486 AMAQI
30th Jul 2025527 AMAQI
30th Jul 2025528 AMAQI
30th Jul 2025539 AMAQI
30th Jul 20255410 AMAQI
30th Jul 20255411 AMAQI
30th Jul 20255412 PMAQI
30th Jul 2025551 PMAQI
30th Jul 2025552 PMAQI
30th Jul 2025553 PMAQI
30th Jul 2025554 PMAQI
30th Jul 2025555 PMAQI
30th Jul 2025556 PMAQI
30th Jul 2025557 PMAQI
30th Jul 2025558 PMAQI
30th Jul 2025549 PMAQI
30th Jul 20255410 PMAQI
30th Jul 20255411 PMAQI
31st Jul 20255412 AMAQI
31st Jul 2025541 AMAQI
31st Jul 2025452 AMAQI
31st Jul 2025453 AMAQI
31st Jul 2025454 AMAQI
26°C23/28°C
31st Jul 2025505 AMAQI
31st Jul 2025546 AMAQI
31st Jul 2025577 AMAQI
31st Jul 2025628 AMAQI
31st Jul 2025669 AMAQI
31st Jul 20257010 AMAQI
31st Jul 20257811 AMAQI
31st Jul 20258712 PMAQI
31st Jul 2025881 PMAQI
31st Jul 2025902 PMAQI
31st Jul 2025913 PMAQI
31st Jul 2025904 PMAQI
31st Jul 2025915 PMAQI
31st Jul 2025906 PMAQI
31st Jul 2025667 PMAQI
31st Jul 2025748 PMAQI
31st Jul 2025829 PMAQI
31st Jul 20258510 PMAQI
31st Jul 20257411 PMAQI
1st Aug 20256912 AMAQI
1st Aug 2025611 AMAQI
1st Aug 2025652 AMAQI
1st Aug 2025703 AMAQI
1st Aug 2025724 AMAQI
22°C17/24°C
1st Aug 2025745 AMAQI
1st Aug 2025716 AMAQI
1st Aug 2025707 AMAQI
1st Aug 2025728 AMAQI
1st Aug 2025689 AMAQI
1st Aug 20256910 AMAQI
1st Aug 20256411 AMAQI
1st Aug 20256312 PMAQI
1st Aug 2025611 PMAQI
1st Aug 2025592 PMAQI
1st Aug 2025563 PMAQI
1st Aug 2025554 PMAQI
1st Aug 2025495 PMAQI
1st Aug 2025376 PMAQI
1st Aug 2025687 PMAQI
1st Aug 2025488 PMAQI
1st Aug 2025309 PMAQI
1st Aug 20253410 PMAQI
1st Aug 20253511 PMAQI
2nd Aug 20254212 AMAQI
2nd Aug 2025431 AMAQI
2nd Aug 2025412 AMAQI
2nd Aug 2025343 AMAQI
2nd Aug 2025324 AMAQI
19°C16/22°C
2nd Aug 2025335 AMAQI
2nd Aug 2025336 AMAQI
2nd Aug 2025317 AMAQI
2nd Aug 2025308 AMAQI
2nd Aug 2025299 AMAQI
2nd Aug 20252410 AMAQI
2nd Aug 20252411 AMAQI
2nd Aug 20252612 PMAQI
2nd Aug 2025291 PMAQI
2nd Aug 2025272 PMAQI
2nd Aug 2025263 PMAQI
2nd Aug 2025254 PMAQI
2nd Aug 2025265 PMAQI
2nd Aug 2025266 PMAQI
2nd Aug 2025287 PMAQI
2nd Aug 2025318 PMAQI
2nd Aug 2025349 PMAQI
2nd Aug 20253610 PMAQI
2nd Aug 20253511 PMAQI
3rd Aug 20253012 AMAQI
3rd Aug 2025401 AMAQI
3rd Aug 2025382 AMAQI
3rd Aug 2025353 AMAQI
3rd Aug 2025354 AMAQI
19°C15/24°C
3rd Aug 2025405 AMAQI
3rd Aug 2025346 AMAQI
3rd Aug 2025337 AMAQI
3rd Aug 2025378 AMAQI
3rd Aug 2025509 AMAQI
3rd Aug 20255810 AMAQI
3rd Aug 20256411 AMAQI
3rd Aug 20256912 PMAQI
3rd Aug 2025741 PMAQI
3rd Aug 2025792 PMAQI
3rd Aug 2025823 PMAQI
3rd Aug 2025834 PMAQI
3rd Aug 2025805 PMAQI
3rd Aug 2025776 PMAQI
3rd Aug 2025537 PMAQI
3rd Aug 2025568 PMAQI
3rd Aug 2025629 PMAQI
3rd Aug 20255510 PMAQI
3rd Aug 20255211 PMAQI
4th Aug 20255212 AMAQI
4th Aug 2025541 AMAQI
4th Aug 2025562 AMAQI
4th Aug 2025383 AMAQI
4th Aug 2025404 AMAQI
22°C16/29°C
4th Aug 2025445 AMAQI
4th Aug 2025486 AMAQI
4th Aug 2025537 AMAQI
4th Aug 2025578 AMAQI
4th Aug 2025659 AMAQI
4th Aug 20257110 AMAQI
4th Aug 20257811 AMAQI
4th Aug 20259112 PMAQI
4th Aug 20251041 PMAQI
4th Aug 20251142 PMAQI
4th Aug 20251153 PMAQI
4th Aug 20251114 PMAQI
4th Aug 20251085 PMAQI
4th Aug 20251056 PMAQI
4th Aug 2025667 PMAQI
4th Aug 2025868 PMAQI
4th Aug 20251019 PMAQI
4th Aug 202510310 PMAQI
4th Aug 202510011 PMAQI
5th Aug 20259612 AMAQI
5th Aug 2025971 AMAQI
5th Aug 2025802 AMAQI
5th Aug 2025803 AMAQI
5th Aug 2025844 AMAQI
23°C17/30°C
5th Aug 2025875 AMAQI
5th Aug 20251056 AMAQI
5th Aug 20251057 AMAQI
5th Aug 20251228 AMAQI
5th Aug 20251209 AMAQI
5th Aug 202511910 AMAQI
5th Aug 202511211 AMAQI
5th Aug 202510012 PMAQI
5th Aug 2025831 PMAQI
5th Aug 2025732 PMAQI
5th Aug 2025653 PMAQI
5th Aug 2025604 PMAQI
5th Aug 2025565 PMAQI
5th Aug 2025526 PMAQI
5th Aug 2025877 PMAQI
5th Aug 2025698 PMAQI
5th Aug 2025539 PMAQI
5th Aug 20255310 PMAQI
5th Aug 20255411 PMAQI
6th Aug 20255112 AMAQI
6th Aug 2025441 AMAQI
6th Aug 2025472 AMAQI
6th Aug 2025493 AMAQI
6th Aug 2025504 AMAQI
21°C19/22°C
6th Aug 2025525 AMAQI
6th Aug 2025516 AMAQI
6th Aug 2025527 AMAQI
6th Aug 2025538 AMAQI
6th Aug 2025549 AMAQI
6th Aug 20255410 AMAQI
6th Aug 20255511 AMAQI
6th Aug 20255512 PMAQI
6th Aug 2025521 PMAQI
6th Aug 2025452 PMAQI
6th Aug 2025363 PMAQI
6th Aug 2025334 PMAQI
6th Aug 2025365 PMAQI
6th Aug 2025406 PMAQI
6th Aug 2025527 PMAQI
6th Aug 2025578 PMAQI
6th Aug 2025609 PMAQI
6th Aug 20256610 PMAQI
6th Aug 20255411 PMAQI
7th Aug 20255612 AMAQI
7th Aug 2025781 AMAQI
7th Aug 2025782 AMAQI
7th Aug 2025773 AMAQI
7th Aug 2025684 AMAQI
20°C17/23°C
7th Aug 2025675 AMAQI
7th Aug 2025686 AMAQI
7th Aug 2025707 AMAQI
7th Aug 2025718 AMAQI
7th Aug 2025719 AMAQI
7th Aug 20256810 AMAQI
7th Aug 20256311 AMAQI
7th Aug 20255812 PMAQI
7th Aug 2025551 PMAQI
7th Aug 2025562 PMAQI
7th Aug 2025583 PMAQI
7th Aug 2025584 PMAQI
7th Aug 2025585 PMAQI
7th Aug 2025586 PMAQI
7th Aug 2025627 PMAQI
7th Aug 2025628 PMAQI
7th Aug 2025589 PMAQI
7th Aug 20255710 PMAQI
7th Aug 20255711 PMAQI
8th Aug 20255512 AMAQI
8th Aug 2025361 AMAQI
8th Aug 2025312 AMAQI
8th Aug 2025303 AMAQI
8th Aug 2025304 AMAQI
21°C16/24°C
8th Aug 2025305 AMAQI
8th Aug 2025316 AMAQI
8th Aug 2025337 AMAQI
8th Aug 2025358 AMAQI
8th Aug 2025339 AMAQI
8th Aug 20253410 AMAQI
8th Aug 20253511 AMAQI
8th Aug 20253512 PMAQI
8th Aug 2025361 PMAQI
8th Aug 2025362 PMAQI
8th Aug 2025363 PMAQI
8th Aug 2025364 PMAQI
8th Aug 2025365 PMAQI
8th Aug 2025356 PMAQI
8th Aug 2025357 PMAQI
8th Aug 2025368 PMAQI
8th Aug 2025369 PMAQI
8th Aug 20253610 PMAQI
8th Aug 20253511 PMAQI
9th Aug 20253312 AMAQI
9th Aug 2025321 AMAQI
9th Aug 2025342 AMAQI
9th Aug 2025333 AMAQI
9th Aug 2025334 AMAQI
22°C17/26°C
9th Aug 2025335 AMAQI
9th Aug 2025326 AMAQI
9th Aug 2025337 AMAQI
9th Aug 2025338 AMAQI
9th Aug 2025339 AMAQI
9th Aug 20253310 AMAQI
9th Aug 20253311 AMAQI
9th Aug 20253512 PMAQI
9th Aug 2025351 PMAQI
9th Aug 2025342 PMAQI
9th Aug 2025343 PMAQI
9th Aug 2025324 PMAQI
9th Aug 2025325 PMAQI
9th Aug 2025326 PMAQI
9th Aug 2025347 PMAQI
9th Aug 2025328 PMAQI
9th Aug 2025329 PMAQI
9th Aug 20253310 PMAQI
9th Aug 20253411 PMAQI
10th Aug 20253312 AMAQI
10th Aug 2025301 AMAQI
10th Aug 2025322 AMAQI
10th Aug 2025303 AMAQI
10th Aug 2025304 AMAQI
20°C17/24°C
10th Aug 2025295 AMAQI
5 AM10th Aug 2025286 AMAQI
10th Aug 2025307 AMAQI
10th Aug 2025318 AMAQI
10th Aug 2025329 AMAQI
10th Aug 20253510 AMAQI
10th Aug 20253811 AMAQI
10th Aug 20254412 PMAQI
12 PM10th Aug 2025461 PMAQI
10th Aug 2025472 PMAQI
10th Aug 2025433 PMAQI
10th Aug 2025434 PMAQI
10th Aug 2025445 PMAQI
10th Aug 2025416 PMAQI
8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 8 PM
46AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM
46AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 46), while the lowest AQI was between 5 AM to 8 PM (Avg. 46).
Night time
Avg. Highest Time
9 PM - 11 PM
43AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
12 AM - 4 AM
41AQI
5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 11 PM (Avg. 43), while the lowest AQI was between 12 AM to 4 AM (Avg. 41).
2025 Days Vs Air Quality
Chelsea, Massachusetts, United States
2025
85%
187
15%
34
Total number of days with different AQI categories in last 222 days in 2025 (143 days remaining)
Good
187 DaysModerate
34 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2025, 85% of 222 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
Chelsea, Massachusetts, United States
AQI levels in 2025
AQI
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.
1st January 2025
28AQI
28AQI
2nd January 2025
21AQI
21AQI
3rd January 2025
21AQI
21AQI
4th January 2025
25AQI
25AQI
5th January 2025
24AQI
24AQI
6th January 2025
21AQI
21AQI
7th January 2025
21AQI
21AQI
8th January 2025
21AQI
21AQI
9th January 2025
23AQI
23AQI
10th January 2025
24AQI
24AQI
11th January 2025
35AQI
35AQI
12th January 2025
38AQI
38AQI
13th January 2025
56AQI
56AQI
14th January 2025
28AQI
28AQI
15th January 2025
24AQI
24AQI
16th January 2025
34AQI
34AQI
17th January 2025
60AQI
60AQI
18th January 2025
45AQI
45AQI
19th January 2025
31AQI
31AQI
20th January 2025
34AQI
34AQI
21st January 2025
55AQI
55AQI
22nd January 2025
59AQI
59AQI
23rd January 2025
54AQI
54AQI
24th January 2025
56AQI
56AQI
25th January 2025
45AQI
45AQI
26th January 2025
48AQI
48AQI
27th January 2025
28AQI
28AQI
28th January 2025
28AQI
28AQI
29th January 2025
33AQI
33AQI
30th January 2025
32AQI
32AQI
31st January 2025
40AQI
40AQI
1st February 2025
30AQI
30AQI
2nd February 2025
28AQI
28AQI
3rd February 2025
48AQI
48AQI
4th February 2025
28AQI
28AQI
5th February 2025
24AQI
24AQI
6th February 2025
36AQI
36AQI
7th February 2025
33AQI
33AQI
8th February 2025
32AQI
32AQI
9th February 2025
34AQI
34AQI
10th February 2025
34AQI
34AQI
11th February 2025
48AQI
48AQI
12th February 2025
38AQI
38AQI
13th February 2025
25AQI
25AQI
14th February 2025
28AQI
28AQI
15th February 2025
28AQI
28AQI
16th February 2025
26AQI
26AQI
17th February 2025
28AQI
28AQI
18th February 2025
26AQI
26AQI
19th February 2025
23AQI
23AQI
20th February 2025
27AQI
27AQI
21st February 2025
24AQI
24AQI
22nd February 2025
28AQI
28AQI
23rd February 2025
43AQI
43AQI
24th February 2025
48AQI
48AQI
25th February 2025
46AQI
46AQI
26th February 2025
29AQI
29AQI
27th February 2025
40AQI
40AQI
28th February 2025
26AQI
26AQI
1st March 2025
29AQI
29AQI
2nd March 2025
28AQI
28AQI
3rd March 2025
27AQI
27AQI
4th March 2025
37AQI
37AQI
5th March 2025
33AQI
33AQI
6th March 2025
26AQI
26AQI
7th March 2025
29AQI
29AQI
8th March 2025
30AQI
30AQI
9th March 2025
29AQI
29AQI
10th March 2025
29AQI
29AQI
11th March 2025
36AQI
36AQI
12th March 2025
28AQI
28AQI
13th March 2025
22AQI
22AQI
14th March 2025
28AQI
28AQI
15th March 2025
26AQI
26AQI
16th March 2025
36AQI
36AQI
17th March 2025
22AQI
22AQI
18th March 2025
18AQI
18AQI
19th March 2025
24AQI
24AQI
20th March 2025
17AQI
17AQI
21st March 2025
16AQI
16AQI
22nd March 2025
21AQI
21AQI
23rd March 2025
18AQI
18AQI
24th March 2025
29AQI
29AQI
25th March 2025
31AQI
31AQI
26th March 2025
26AQI
26AQI
27th March 2025
18AQI
18AQI
28th March 2025
21AQI
21AQI
29th March 2025
23AQI
23AQI
30th March 2025
25AQI
25AQI
31st March 2025
38AQI
38AQI
1st April 2025
19AQI
19AQI
2nd April 2025
19AQI
19AQI
3rd April 2025
27AQI
27AQI
4th April 2025
26AQI
26AQI
5th April 2025
23AQI
23AQI
6th April 2025
22AQI
22AQI
7th April 2025
17AQI
17AQI
8th April 2025
17AQI
17AQI
9th April 2025
15AQI
15AQI
10th April 2025
20AQI
20AQI
11th April 2025
21AQI
21AQI
12th April 2025
18AQI
18AQI
13th April 2025
17AQI
17AQI
14th April 2025
21AQI
21AQI
15th April 2025
32AQI
32AQI
16th April 2025
12AQI
12AQI
17th April 2025
14AQI
14AQI
18th April 2025
22AQI
22AQI
19th April 2025
50AQI
50AQI
20th April 2025
21AQI
21AQI
21st April 2025
16AQI
16AQI
22nd April 2025
42AQI
42AQI
23rd April 2025
26AQI
26AQI
24th April 2025
23AQI
23AQI
25th April 2025
54AQI
54AQI
26th April 2025
32AQI
32AQI
27th April 2025
12AQI
12AQI
28th April 2025
19AQI
19AQI
29th April 2025
25AQI
25AQI
30th April 2025
22AQI
22AQI
1st May 2025
18AQI
18AQI
2nd May 2025
42AQI
42AQI
3rd May 2025
47AQI
47AQI
4th May 2025
38AQI
38AQI
5th May 2025
28AQI
28AQI
6th May 2025
34AQI
34AQI
7th May 2025
29AQI
29AQI
8th May 2025
25AQI
25AQI
9th May 2025
34AQI
34AQI
10th May 2025
16AQI
16AQI
11th May 2025
21AQI
21AQI
12th May 2025
22AQI
22AQI
13th May 2025
29AQI
29AQI
14th May 2025
30AQI
30AQI
15th May 2025
40AQI
40AQI
16th May 2025
36AQI
36AQI
17th May 2025
37AQI
37AQI
18th May 2025
19AQI
19AQI
19th May 2025
13AQI
13AQI
20th May 2025
13AQI
13AQI
21st May 2025
18AQI
18AQI
22nd May 2025
23AQI
23AQI
23rd May 2025
14AQI
14AQI
24th May 2025
14AQI
14AQI
25th May 2025
13AQI
13AQI
26th May 2025
19AQI
19AQI
27th May 2025
27AQI
27AQI
28th May 2025
28AQI
28AQI
29th May 2025
23AQI
23AQI
30th May 2025
34AQI
34AQI
31st May 2025
20AQI
20AQI
1st June 2025
13AQI
13AQI
2nd June 2025
18AQI
18AQI
3rd June 2025
25AQI
25AQI
4th June 2025
39AQI
39AQI
5th June 2025
58AQI
58AQI
6th June 2025
62AQI
62AQI
7th June 2025
54AQI
54AQI
8th June 2025
88AQI
88AQI
9th June 2025
81AQI
81AQI
10th June 2025
54AQI
54AQI
11th June 2025
52AQI
52AQI
12th June 2025
71AQI
71AQI
13th June 2025
53AQI
53AQI
14th June 2025
47AQI
47AQI
15th June 2025
31AQI
31AQI
16th June 2025
34AQI
34AQI
17th June 2025
30AQI
30AQI
18th June 2025
25AQI
25AQI
19th June 2025
29AQI
29AQI
20th June 2025
34AQI
34AQI
21st June 2025
53AQI
53AQI
22nd June 2025
54AQI
54AQI
23rd June 2025
52AQI
52AQI
24th June 2025
56AQI
56AQI
25th June 2025
53AQI
53AQI
26th June 2025
38AQI
38AQI
27th June 2025
26AQI
26AQI
28th June 2025
28AQI
28AQI
29th June 2025
41AQI
41AQI
30th June 2025
39AQI
39AQI
1st July 2025
41AQI
41AQI
2nd July 2025
34AQI
34AQI
3rd July 2025
46AQI
46AQI
4th July 2025
44AQI
44AQI
5th July 2025
50AQI
50AQI
6th July 2025
59AQI
59AQI
7th July 2025
44AQI
44AQI
8th July 2025
37AQI
37AQI
9th July 2025
33AQI
33AQI
10th July 2025
31AQI
31AQI
11th July 2025
32AQI
32AQI
12th July 2025
33AQI
33AQI
13th July 2025
24AQI
24AQI
14th July 2025
25AQI
25AQI
15th July 2025
29AQI
29AQI
16th July 2025
38AQI
38AQI
17th July 2025
40AQI
40AQI
18th July 2025
21AQI
21AQI
19th July 2025
27AQI
27AQI
20th July 2025
21AQI
21AQI
21st July 2025
30AQI
30AQI
22nd July 2025
19AQI
19AQI
23rd July 2025
25AQI
25AQI
24th July 2025
29AQI
29AQI
25th July 2025
38AQI
38AQI
26th July 2025
76AQI
76AQI
27th July 2025
79AQI
79AQI
28th July 2025
71AQI
71AQI
29th July 2025
60AQI
60AQI
30th July 2025
54AQI
54AQI
31st July 2025
69AQI
69AQI
1st August 2025
58AQI
58AQI
2nd August 2025
32AQI
32AQI
3rd August 2025
53AQI
53AQI
4th August 2025
75AQI
75AQI
5th August 2025
82AQI
82AQI
6th August 2025
51AQI
51AQI
7th August 2025
64AQI
64AQI
8th August 2025
35AQI
35AQI
9th August 2025
33AQI
33AQI
35AQI
32AQI
26AQI
23AQI
26AQI
45AQI
41AQI
54AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202534AQI
25
6
28
31
29
1
31
16
14
24
7
3
6
187
34
Highest AQI recorded in
August54AQI
Lowest AQI recorded in
April23AQI
202431AQI
26
5
27
2
31
30
31
29
27
4
22
9
30
31
27
3
29
2
340
22
3
Highest AQI recorded in
July39AQI
Lowest AQI recorded in
September25AQI
202335AQI
30
1
27
1
31
27
3
30
1
20
10
21
9
1
26
5
22
8
28
3
28
1
30
1
320
43
1
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
November27AQI
202233AQI
19
12
20
1
27
4
29
30
1
29
1
20
3
2
29
31
29
1
28
3
293
26
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
September26AQI
202133AQI
26
4
22
6
29
2
30
31
25
4
24
7
24
7
30
31
27
3
27
4
326
37
Highest AQI recorded in
July42AQI
Lowest AQI recorded in
April26AQI
202034AQI
13
20
18
28
2
30
1
28
3
26
4
28
3
26
4
26
5
243
22
Highest AQI recorded in
August42AQI
Lowest AQI recorded in
April23AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
35AQILeast Polluted Year Recorded
2024(Avg.)
31AQIChelsea's annual 2025 AQI (34) shows an average percentage change of 1.1% (worsened AQI) compared to previous years: 2020 (34), 2021 (33), 2022 (33), 2023 (35), 2024 (31).
