Boston, 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
Boston, 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 (7th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 66 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 8th Aug - 9th Aug 2025
Boston, Chelsea, Massachusetts, United States
AQI
Day
Night
.
5 AM8th Aug 2025
8 PM
4 AM9th Aug 2025
Day time
Avg. Highest Time
12PM8th Aug
37AQI
Avg. Lowest Time
5AM8th Aug
29AQI
Night time
Avg. Highest Time
10PM8th Aug
37AQI
Avg. Lowest Time
1AM9th Aug
32AQI
In the last 24 hours,
Boston's AQI reached its highest point of 37 at 12 PM during the Day, while the lowest point, 29, was recorded at 5 AM during the Day between 8th Aug and 9th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Boston, Chelsea, Massachusetts, United States
JulAug
10th - 11th11th - 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
Day
Night
10th Jul 2025345 AMAQI
10th Jul 2025286 AMAQI
10th Jul 2025287 AMAQI
10th Jul 2025268 AMAQI
10th Jul 2025349 AMAQI
10th Jul 20252910 AMAQI
10th Jul 20253011 AMAQI
10th Jul 20252812 PMAQI
10th Jul 2025301 PMAQI
10th Jul 2025292 PMAQI
10th Jul 2025323 PMAQI
10th Jul 2025314 PMAQI
10th Jul 2025295 PMAQI
10th Jul 2025306 PMAQI
10th Jul 2025297 PMAQI
10th Jul 2025298 PMAQI
10th Jul 2025309 PMAQI
10th Jul 20252810 PMAQI
10th Jul 20253011 PMAQI
11th Jul 20252912 AMAQI
11th Jul 2025311 AMAQI
11th Jul 2025292 AMAQI
11th Jul 2025303 AMAQI
11th Jul 2025324 AMAQI
20°C19/24°C
11th Jul 2025365 AMAQI
11th Jul 2025336 AMAQI
11th Jul 2025347 AMAQI
11th Jul 2025348 AMAQI
11th Jul 2025369 AMAQI
11th Jul 20253310 AMAQI
11th Jul 20253211 AMAQI
11th Jul 20253012 PMAQI
11th Jul 2025321 PMAQI
11th Jul 2025322 PMAQI
11th Jul 2025323 PMAQI
11th Jul 2025354 PMAQI
11th Jul 2025335 PMAQI
11th Jul 2025336 PMAQI
11th Jul 2025327 PMAQI
11th Jul 2025308 PMAQI
11th Jul 2025329 PMAQI
11th Jul 20253310 PMAQI
11th Jul 20253411 PMAQI
12th Jul 20253412 AMAQI
12th Jul 2025321 AMAQI
12th Jul 2025302 AMAQI
12th Jul 2025373 AMAQI
12th Jul 2025344 AMAQI
21°C18/25°C
12th Jul 2025345 AMAQI
12th Jul 2025346 AMAQI
12th Jul 2025367 AMAQI
12th Jul 2025368 AMAQI
12th Jul 2025369 AMAQI
12th Jul 20253610 AMAQI
12th Jul 20253511 AMAQI
12th Jul 20253412 PMAQI
12th Jul 2025341 PMAQI
12th Jul 2025322 PMAQI
12th Jul 2025323 PMAQI
12th Jul 2025354 PMAQI
12th Jul 2025335 PMAQI
12th Jul 2025326 PMAQI
12th Jul 2025347 PMAQI
12th Jul 2025328 PMAQI
12th Jul 2025309 PMAQI
12th Jul 20253210 PMAQI
12th Jul 20253311 PMAQI
13th Jul 20253012 AMAQI
13th Jul 2025341 AMAQI
13th Jul 2025232 AMAQI
13th Jul 2025223 AMAQI
13th Jul 2025204 AMAQI
22°C20/26°C
13th Jul 2025225 AMAQI
13th Jul 2025196 AMAQI
13th Jul 2025227 AMAQI
13th Jul 2025218 AMAQI
13th Jul 2025229 AMAQI
13th Jul 20252310 AMAQI
13th Jul 20252311 AMAQI
13th Jul 20252212 PMAQI
13th Jul 2025221 PMAQI
13th Jul 2025222 PMAQI
13th Jul 2025243 PMAQI
13th Jul 2025244 PMAQI
13th Jul 2025255 PMAQI
13th Jul 2025266 PMAQI
13th Jul 2025247 PMAQI
13th Jul 2025248 PMAQI
13th Jul 2025239 PMAQI
13th Jul 20252510 PMAQI
13th Jul 20252311 PMAQI
14th Jul 20252312 AMAQI
14th Jul 2025211 AMAQI
14th Jul 2025222 AMAQI
14th Jul 2025203 AMAQI
14th Jul 2025224 AMAQI
22°C18/25°C
14th Jul 2025235 AMAQI
14th Jul 2025236 AMAQI
14th Jul 2025247 AMAQI
14th Jul 2025258 AMAQI
14th Jul 2025249 AMAQI
14th Jul 20252310 AMAQI
14th Jul 20252311 AMAQI
14th Jul 20252212 PMAQI
14th Jul 2025241 PMAQI
14th Jul 2025262 PMAQI
14th Jul 2025243 PMAQI
14th Jul 2025264 PMAQI
14th Jul 2025245 PMAQI
14th Jul 2025256 PMAQI
14th Jul 2025257 PMAQI
14th Jul 2025248 PMAQI
14th Jul 2025269 PMAQI
14th Jul 20252510 PMAQI
14th Jul 20252511 PMAQI
15th Jul 20252512 AMAQI
15th Jul 2025251 AMAQI
15th Jul 2025252 AMAQI
15th Jul 2025283 AMAQI
15th Jul 2025324 AMAQI
22°C19/27°C
15th Jul 2025295 AMAQI
15th Jul 2025246 AMAQI
15th Jul 2025247 AMAQI
15th Jul 2025258 AMAQI
15th Jul 2025249 AMAQI
15th Jul 20252610 AMAQI
15th Jul 20252911 AMAQI
15th Jul 20253112 PMAQI
15th Jul 2025361 PMAQI
15th Jul 2025342 PMAQI
15th Jul 2025303 PMAQI
15th Jul 2025304 PMAQI
15th Jul 2025305 PMAQI
15th Jul 2025296 PMAQI
15th Jul 2025307 PMAQI
15th Jul 2025298 PMAQI
15th Jul 2025309 PMAQI
15th Jul 20253010 PMAQI
15th Jul 20253011 PMAQI
16th Jul 20252812 AMAQI
16th Jul 2025281 AMAQI
16th Jul 2025252 AMAQI
16th Jul 2025253 AMAQI
16th Jul 2025264 AMAQI
27°C22/34°C
16th Jul 2025285 AMAQI
16th Jul 2025306 AMAQI
16th Jul 2025307 AMAQI
16th Jul 2025358 AMAQI
16th Jul 2025389 AMAQI
16th Jul 20254310 AMAQI
16th Jul 20255011 AMAQI
16th Jul 20254412 PMAQI
16th Jul 2025441 PMAQI
16th Jul 2025402 PMAQI
16th Jul 2025373 PMAQI
16th Jul 2025394 PMAQI
16th Jul 2025375 PMAQI
16th Jul 2025386 PMAQI
16th Jul 2025377 PMAQI
16th Jul 2025368 PMAQI
16th Jul 2025419 PMAQI
16th Jul 20254110 PMAQI
16th Jul 20253611 PMAQI
17th Jul 20253612 AMAQI
17th Jul 2025341 AMAQI
17th Jul 2025372 AMAQI
17th Jul 2025353 AMAQI
17th Jul 2025364 AMAQI
27°C22/33°C
17th Jul 2025405 AMAQI
17th Jul 2025406 AMAQI
17th Jul 2025407 AMAQI
17th Jul 2025428 AMAQI
17th Jul 2025439 AMAQI
17th Jul 20254610 AMAQI
17th Jul 20254311 AMAQI
17th Jul 20254212 PMAQI
17th Jul 2025381 PMAQI
17th Jul 2025332 PMAQI
17th Jul 2025363 PMAQI
17th Jul 2025374 PMAQI
17th Jul 2025375 PMAQI
17th Jul 2025356 PMAQI
17th Jul 2025347 PMAQI
17th Jul 2025368 PMAQI
17th Jul 2025369 PMAQI
17th Jul 20253710 PMAQI
17th Jul 20253511 PMAQI
18th Jul 20253512 AMAQI
18th Jul 2025341 AMAQI
18th Jul 2025222 AMAQI
18th Jul 2025193 AMAQI
18th Jul 2025194 AMAQI
26°C23/32°C
18th Jul 2025175 AMAQI
18th Jul 2025196 AMAQI
18th Jul 2025217 AMAQI
18th Jul 2025198 AMAQI
18th Jul 2025199 AMAQI
18th Jul 20251810 AMAQI
18th Jul 20251811 AMAQI
18th Jul 20251612 PMAQI
18th Jul 2025171 PMAQI
18th Jul 2025182 PMAQI
18th Jul 2025203 PMAQI
18th Jul 2025204 PMAQI
18th Jul 2025205 PMAQI
18th Jul 2025216 PMAQI
18th Jul 2025197 PMAQI
18th Jul 2025208 PMAQI
18th Jul 2025209 PMAQI
18th Jul 20252110 PMAQI
18th Jul 20252111 PMAQI
19th Jul 20252112 AMAQI
19th Jul 2025221 AMAQI
19th Jul 2025282 AMAQI
19th Jul 2025303 AMAQI
19th Jul 2025284 AMAQI
25°C20/29°C
19th Jul 2025275 AMAQI
19th Jul 2025276 AMAQI
19th Jul 2025277 AMAQI
19th Jul 2025278 AMAQI
19th Jul 2025279 AMAQI
19th Jul 20253210 AMAQI
19th Jul 20253111 AMAQI
19th Jul 20253212 PMAQI
19th Jul 2025291 PMAQI
19th Jul 2025292 PMAQI
19th Jul 2025283 PMAQI
19th Jul 2025284 PMAQI
19th Jul 2025275 PMAQI
19th Jul 2025266 PMAQI
19th Jul 2025257 PMAQI
19th Jul 2025268 PMAQI
19th Jul 2025299 PMAQI
19th Jul 20252810 PMAQI
19th Jul 20252711 PMAQI
20th Jul 20252612 AMAQI
20th Jul 2025231 AMAQI
20th Jul 2025182 AMAQI
20th Jul 2025173 AMAQI
20th Jul 2025164 AMAQI
24°C17/30°C
20th Jul 2025165 AMAQI
20th Jul 2025176 AMAQI
20th Jul 2025187 AMAQI
20th Jul 2025188 AMAQI
20th Jul 2025199 AMAQI
20th Jul 20252010 AMAQI
20th Jul 20251911 AMAQI
20th Jul 20251812 PMAQI
20th Jul 2025191 PMAQI
20th Jul 2025212 PMAQI
20th Jul 2025203 PMAQI
20th Jul 2025224 PMAQI
20th Jul 2025215 PMAQI
20th Jul 2025236 PMAQI
20th Jul 2025207 PMAQI
20th Jul 2025218 PMAQI
20th Jul 2025249 PMAQI
20th Jul 20252210 PMAQI
20th Jul 20252211 PMAQI
21st Jul 20252212 AMAQI
21st Jul 2025221 AMAQI
21st Jul 2025202 AMAQI
21st Jul 2025183 AMAQI
21st Jul 2025204 AMAQI
25°C20/32°C
21st Jul 2025225 AMAQI
21st Jul 2025316 AMAQI
21st Jul 2025307 AMAQI
21st Jul 2025338 AMAQI
21st Jul 2025459 AMAQI
21st Jul 20255410 AMAQI
21st Jul 20255611 AMAQI
21st Jul 20255412 PMAQI
21st Jul 2025531 PMAQI
21st Jul 2025462 PMAQI
21st Jul 2025433 PMAQI
21st Jul 2025334 PMAQI
21st Jul 2025265 PMAQI
21st Jul 2025236 PMAQI
21st Jul 2025247 PMAQI
21st Jul 2025248 PMAQI
21st Jul 2025229 PMAQI
21st Jul 20252310 PMAQI
21st Jul 20252411 PMAQI
22nd Jul 20252612 AMAQI
22nd Jul 2025251 AMAQI
22nd Jul 2025172 AMAQI
22nd Jul 2025163 AMAQI
22nd Jul 2025154 AMAQI
23°C19/27°C
22nd Jul 2025165 AMAQI
22nd Jul 2025176 AMAQI
22nd Jul 2025187 AMAQI
22nd Jul 2025188 AMAQI
22nd Jul 2025209 AMAQI
22nd Jul 20252410 AMAQI
22nd Jul 20252111 AMAQI
22nd Jul 20251712 PMAQI
22nd Jul 2025181 PMAQI
22nd Jul 2025182 PMAQI
22nd Jul 2025193 PMAQI
22nd Jul 2025194 PMAQI
22nd Jul 2025195 PMAQI
22nd Jul 2025196 PMAQI
22nd Jul 2025207 PMAQI
22nd Jul 2025218 PMAQI
22nd Jul 2025229 PMAQI
22nd Jul 20252010 PMAQI
22nd Jul 20252311 PMAQI
23rd Jul 20252212 AMAQI
23rd Jul 2025211 AMAQI
23rd Jul 2025202 AMAQI
23rd Jul 2025223 AMAQI
23rd Jul 2025244 AMAQI
21°C15/27°C
23rd Jul 2025325 AMAQI
23rd Jul 2025226 AMAQI
23rd Jul 2025227 AMAQI
23rd Jul 2025268 AMAQI
23rd Jul 2025269 AMAQI
23rd Jul 20252910 AMAQI
23rd Jul 20252811 AMAQI
23rd Jul 20253012 PMAQI
23rd Jul 2025291 PMAQI
23rd Jul 2025292 PMAQI
23rd Jul 2025253 PMAQI
23rd Jul 2025244 PMAQI
23rd Jul 2025255 PMAQI
23rd Jul 2025266 PMAQI
23rd Jul 2025257 PMAQI
23rd Jul 2025268 PMAQI
23rd Jul 2025279 PMAQI
23rd Jul 20252510 PMAQI
23rd Jul 20252511 PMAQI
24th Jul 20252312 AMAQI
24th Jul 2025241 AMAQI
24th Jul 2025222 AMAQI
24th Jul 2025243 AMAQI
24th Jul 2025214 AMAQI
23°C18/28°C
24th Jul 2025225 AMAQI
24th Jul 2025226 AMAQI
24th Jul 2025217 AMAQI
24th Jul 2025238 AMAQI
24th Jul 2025269 AMAQI
24th Jul 20253210 AMAQI
24th Jul 20253311 AMAQI
24th Jul 20253112 PMAQI
24th Jul 2025351 PMAQI
24th Jul 2025382 PMAQI
24th Jul 2025363 PMAQI
24th Jul 2025344 PMAQI
24th Jul 2025355 PMAQI
24th Jul 2025366 PMAQI
24th Jul 2025287 PMAQI
24th Jul 2025278 PMAQI
24th Jul 2025309 PMAQI
24th Jul 20252910 PMAQI
24th Jul 20252811 PMAQI
25th Jul 20252812 AMAQI
25th Jul 2025281 AMAQI
25th Jul 2025272 AMAQI
25th Jul 2025283 AMAQI
25th Jul 2025324 AMAQI
26°C19/33°C
25th Jul 2025345 AMAQI
25th Jul 2025486 AMAQI
25th Jul 2025377 AMAQI
25th Jul 2025408 AMAQI
25th Jul 2025459 AMAQI
25th Jul 20255010 AMAQI
25th Jul 20255011 AMAQI
25th Jul 20254812 PMAQI
25th Jul 2025491 PMAQI
25th Jul 2025492 PMAQI
25th Jul 2025423 PMAQI
25th Jul 2025404 PMAQI
25th Jul 2025405 PMAQI
25th Jul 2025386 PMAQI
25th Jul 2025397 PMAQI
25th Jul 2025388 PMAQI
25th Jul 2025329 PMAQI
25th Jul 20253410 PMAQI
25th Jul 20253511 PMAQI
26th Jul 20253512 AMAQI
26th Jul 2025331 AMAQI
26th Jul 2025572 AMAQI
26th Jul 2025573 AMAQI
26th Jul 2025694 AMAQI
27°C22/35°C
26th Jul 20251195 AMAQI
26th Jul 20251396 AMAQI
26th Jul 20251247 AMAQI
26th Jul 20251268 AMAQI
26th Jul 20251089 AMAQI
26th Jul 20259810 AMAQI
26th Jul 20259511 AMAQI
26th Jul 20258812 PMAQI
26th Jul 2025781 PMAQI
26th Jul 2025752 PMAQI
26th Jul 2025863 PMAQI
26th Jul 2025734 PMAQI
26th Jul 2025665 PMAQI
26th Jul 2025756 PMAQI
26th Jul 2025687 PMAQI
26th Jul 2025668 PMAQI
26th Jul 2025689 PMAQI
26th Jul 20257010 PMAQI
26th Jul 20257311 PMAQI
27th Jul 20257412 AMAQI
27th Jul 2025731 AMAQI
27th Jul 2025782 AMAQI
27th Jul 2025823 AMAQI
27th Jul 2025854 AMAQI
25°C21/29°C
27th Jul 2025855 AMAQI
27th Jul 2025826 AMAQI
27th Jul 2025807 AMAQI
27th Jul 2025768 AMAQI
27th Jul 2025789 AMAQI
27th Jul 20258010 AMAQI
27th Jul 20258011 AMAQI
27th Jul 20258212 PMAQI
27th Jul 2025831 PMAQI
27th Jul 2025842 PMAQI
27th Jul 2025833 PMAQI
27th Jul 2025814 PMAQI
27th Jul 2025805 PMAQI
27th Jul 2025806 PMAQI
27th Jul 2025787 PMAQI
27th Jul 2025778 PMAQI
27th Jul 2025789 PMAQI
27th Jul 20257810 PMAQI
27th Jul 20257811 PMAQI
28th Jul 20257612 AMAQI
28th Jul 2025761 AMAQI
28th Jul 2025842 AMAQI
28th Jul 2025873 AMAQI
28th Jul 2025854 AMAQI
22°C19/25°C
28th Jul 2025785 AMAQI
28th Jul 2025756 AMAQI
28th Jul 2025757 AMAQI
28th Jul 2025738 AMAQI
28th Jul 2025779 AMAQI
28th Jul 20257210 AMAQI
28th Jul 20256911 AMAQI
28th Jul 20256712 PMAQI
28th Jul 2025661 PMAQI
28th Jul 2025662 PMAQI
28th Jul 2025693 PMAQI
28th Jul 2025694 PMAQI
28th Jul 2025685 PMAQI
28th Jul 2025686 PMAQI
28th Jul 2025717 PMAQI
28th Jul 2025678 PMAQI
28th Jul 2025679 PMAQI
28th Jul 20256610 PMAQI
28th Jul 20256611 PMAQI
29th Jul 20256712 AMAQI
29th Jul 2025661 AMAQI
29th Jul 2025602 AMAQI
29th Jul 2025603 AMAQI
29th Jul 2025614 AMAQI
25°C20/32°C
29th Jul 2025605 AMAQI
29th Jul 2025626 AMAQI
29th Jul 2025617 AMAQI
29th Jul 2025628 AMAQI
29th Jul 2025629 AMAQI
29th Jul 20256110 AMAQI
29th Jul 20256011 AMAQI
29th Jul 20256012 PMAQI
29th Jul 2025601 PMAQI
29th Jul 2025612 PMAQI
29th Jul 2025623 PMAQI
29th Jul 2025604 PMAQI
29th Jul 2025615 PMAQI
29th Jul 2025606 PMAQI
29th Jul 2025607 PMAQI
29th Jul 2025608 PMAQI
29th Jul 2025589 PMAQI
29th Jul 20255910 PMAQI
29th Jul 20255811 PMAQI
30th Jul 20255912 AMAQI
30th Jul 2025591 AMAQI
30th Jul 2025572 AMAQI
30th Jul 2025563 AMAQI
30th Jul 2025524 AMAQI
30°C23/37°C
30th Jul 2025485 AMAQI
30th Jul 2025476 AMAQI
30th Jul 2025537 AMAQI
30th Jul 2025528 AMAQI
30th Jul 2025529 AMAQI
30th Jul 20255410 AMAQI
30th Jul 20255311 AMAQI
30th Jul 20255412 PMAQI
30th Jul 2025541 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 20255512 AMAQI
31st Jul 2025541 AMAQI
31st Jul 2025402 AMAQI
31st Jul 2025423 AMAQI
31st Jul 2025444 AMAQI
27°C24/30°C
31st Jul 2025505 AMAQI
31st Jul 2025566 AMAQI
31st Jul 2025577 AMAQI
31st Jul 2025628 AMAQI
31st Jul 2025669 AMAQI
31st Jul 20257010 AMAQI
31st Jul 20257811 AMAQI
31st Jul 20258412 PMAQI
31st Jul 2025871 PMAQI
31st Jul 2025902 PMAQI
31st Jul 2025923 PMAQI
31st Jul 2025904 PMAQI
31st Jul 2025905 PMAQI
31st Jul 2025896 PMAQI
31st Jul 2025657 PMAQI
31st Jul 2025738 PMAQI
31st Jul 2025809 PMAQI
31st Jul 20258510 PMAQI
31st Jul 20257411 PMAQI
1st Aug 20256812 AMAQI
1st Aug 2025601 AMAQI
1st Aug 2025632 AMAQI
1st Aug 2025703 AMAQI
1st Aug 2025684 AMAQI
23°C18/25°C
1st Aug 2025725 AMAQI
1st Aug 2025716 AMAQI
1st Aug 2025707 AMAQI
1st Aug 2025718 AMAQI
1st Aug 2025679 AMAQI
1st Aug 20256810 AMAQI
1st Aug 20256411 AMAQI
1st Aug 20256312 PMAQI
1st Aug 2025621 PMAQI
1st Aug 2025602 PMAQI
1st Aug 2025583 PMAQI
1st Aug 2025564 PMAQI
1st Aug 2025495 PMAQI
1st Aug 2025386 PMAQI
1st Aug 2025677 PMAQI
1st Aug 2025498 PMAQI
1st Aug 2025329 PMAQI
1st Aug 20253510 PMAQI
1st Aug 20253611 PMAQI
2nd Aug 20254812 AMAQI
2nd Aug 2025441 AMAQI
2nd Aug 2025422 AMAQI
2nd Aug 2025373 AMAQI
2nd Aug 2025314 AMAQI
19°C16/22°C
2nd Aug 2025325 AMAQI
2nd Aug 2025336 AMAQI
2nd Aug 2025307 AMAQI
2nd Aug 2025308 AMAQI
2nd Aug 2025299 AMAQI
2nd Aug 20252310 AMAQI
2nd Aug 20252411 AMAQI
2nd Aug 20252712 PMAQI
2nd Aug 2025321 PMAQI
2nd Aug 2025292 PMAQI
2nd Aug 2025273 PMAQI
2nd Aug 2025264 PMAQI
2nd Aug 2025275 PMAQI
2nd Aug 2025286 PMAQI
2nd Aug 2025287 PMAQI
2nd Aug 2025328 PMAQI
2nd Aug 2025349 PMAQI
2nd Aug 20253710 PMAQI
2nd Aug 20253611 PMAQI
3rd Aug 20252412 AMAQI
3rd Aug 2025431 AMAQI
3rd Aug 2025382 AMAQI
3rd Aug 2025343 AMAQI
3rd Aug 2025354 AMAQI
20°C14/26°C
3rd Aug 2025445 AMAQI
3rd Aug 2025346 AMAQI
3rd Aug 2025327 AMAQI
3rd Aug 2025378 AMAQI
3rd Aug 2025509 AMAQI
3rd Aug 20255910 AMAQI
3rd Aug 20256511 AMAQI
3rd Aug 20256912 PMAQI
3rd Aug 2025741 PMAQI
3rd Aug 2025782 PMAQI
3rd Aug 2025823 PMAQI
3rd Aug 2025844 PMAQI
3rd Aug 2025815 PMAQI
3rd Aug 2025826 PMAQI
3rd Aug 2025547 PMAQI
3rd Aug 2025568 PMAQI
3rd Aug 2025669 PMAQI
3rd Aug 20255610 PMAQI
3rd Aug 20255411 PMAQI
4th Aug 20255412 AMAQI
4th Aug 2025541 AMAQI
4th Aug 2025562 AMAQI
4th Aug 2025383 AMAQI
4th Aug 2025434 AMAQI
23°C15/30°C
4th Aug 2025485 AMAQI
4th Aug 2025526 AMAQI
4th Aug 2025557 AMAQI
4th Aug 2025588 AMAQI
4th Aug 2025669 AMAQI
4th Aug 20257210 AMAQI
4th Aug 20258111 AMAQI
4th Aug 20259012 PMAQI
4th Aug 20251031 PMAQI
4th Aug 20251152 PMAQI
4th Aug 20251143 PMAQI
4th Aug 20251124 PMAQI
4th Aug 20251085 PMAQI
4th Aug 20251066 PMAQI
4th Aug 2025677 PMAQI
4th Aug 2025848 PMAQI
4th Aug 20251049 PMAQI
4th Aug 202510410 PMAQI
4th Aug 202510011 PMAQI
5th Aug 20259312 AMAQI
5th Aug 2025961 AMAQI
5th Aug 2025782 AMAQI
5th Aug 2025793 AMAQI
5th Aug 2025814 AMAQI
24°C17/31°C
5th Aug 2025845 AMAQI
5th Aug 20251046 AMAQI
5th Aug 20251047 AMAQI
5th Aug 20251218 AMAQI
5th Aug 20251189 AMAQI
5th Aug 202511810 AMAQI
5th Aug 202511411 AMAQI
5th Aug 202510512 PMAQI
5th Aug 2025861 PMAQI
5th Aug 2025742 PMAQI
5th Aug 2025653 PMAQI
5th Aug 2025614 PMAQI
5th Aug 2025585 PMAQI
5th Aug 2025526 PMAQI
5th Aug 2025837 PMAQI
5th Aug 2025688 PMAQI
5th Aug 2025549 PMAQI
5th Aug 20255310 PMAQI
5th Aug 20255411 PMAQI
6th Aug 20255112 AMAQI
6th Aug 2025451 AMAQI
6th Aug 2025462 AMAQI
6th Aug 2025503 AMAQI
6th Aug 2025494 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 20255510 AMAQI
6th Aug 20255511 AMAQI
6th Aug 20255612 PMAQI
6th Aug 2025531 PMAQI
6th Aug 2025452 PMAQI
6th Aug 2025383 PMAQI
6th Aug 2025324 PMAQI
6th Aug 2025355 PMAQI
6th Aug 2025386 PMAQI
6th Aug 2025527 PMAQI
6th Aug 2025588 PMAQI
6th Aug 2025609 PMAQI
6th Aug 20256510 PMAQI
6th Aug 20255411 PMAQI
7th Aug 20255812 AMAQI
7th Aug 2025801 AMAQI
7th Aug 2025782 AMAQI
7th Aug 2025783 AMAQI
7th Aug 2025664 AMAQI
20°C17/24°C
7th Aug 2025665 AMAQI
7th Aug 2025666 AMAQI
7th Aug 2025717 AMAQI
7th Aug 2025738 AMAQI
7th Aug 2025729 AMAQI
7th Aug 20256810 AMAQI
7th Aug 20256411 AMAQI
7th Aug 20256012 PMAQI
7th Aug 2025561 PMAQI
7th Aug 2025582 PMAQI
7th Aug 2025643 PMAQI
7th Aug 2025644 PMAQI
7th Aug 2025645 PMAQI
7th Aug 2025636 PMAQI
7th Aug 2025647 PMAQI
7th Aug 2025648 PMAQI
7th Aug 2025619 PMAQI
7th Aug 20256210 PMAQI
7th Aug 20256011 PMAQI
8th Aug 20256112 AMAQI
8th Aug 2025361 AMAQI
8th Aug 2025282 AMAQI
8th Aug 2025283 AMAQI
8th Aug 2025294 AMAQI
22°C16/26°C
8th Aug 2025295 AMAQI
8th Aug 2025316 AMAQI
8th Aug 2025347 AMAQI
8th Aug 2025358 AMAQI
8th Aug 2025339 AMAQI
8th Aug 20253410 AMAQI
8th Aug 20253611 AMAQI
8th Aug 20253712 PMAQI
8th Aug 2025361 PMAQI
8th Aug 2025362 PMAQI
8th Aug 2025363 PMAQI
8th Aug 2025364 PMAQI
8th Aug 2025375 PMAQI
8th Aug 2025366 PMAQI
8th Aug 2025367 PMAQI
8th Aug 2025368 PMAQI
8th Aug 2025369 PMAQI
8th Aug 20253710 PMAQI
8th Aug 20253511 PMAQI
9th Aug 20253412 AMAQI
9th Aug 2025321 AMAQI
9th Aug 2025332 AMAQI
9th Aug 2025333 AMAQI
9th Aug 2025334 AMAQI
23°C17/29°C
9th Aug 2025335 AMAQI
5 AM9th Aug 2025306 AMAQI
9th Aug 2025337 AMAQI
12 PM
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
44AQI
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. 44), while the lowest AQI was between 12 AM to 4 AM (Avg. 41).
2025 Days Vs Air Quality
Boston, Chelsea, Massachusetts, United States
2025
84%
185
16%
34
Total number of days with different AQI categories in last 221 days in 2025 (144 days remaining)
Good
185 DaysModerate
34 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 221 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
Boston, 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
22AQI
22AQI
30th March 2025
24AQI
24AQI
31st March 2025
37AQI
37AQI
1st April 2025
19AQI
19AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
26AQI
26AQI
4th April 2025
26AQI
26AQI
5th April 2025
21AQI
21AQI
6th April 2025
21AQI
21AQI
7th April 2025
16AQI
16AQI
8th April 2025
16AQI
16AQI
9th April 2025
16AQI
16AQI
10th April 2025
20AQI
20AQI
11th April 2025
19AQI
19AQI
12th April 2025
16AQI
16AQI
13th April 2025
16AQI
16AQI
14th April 2025
20AQI
20AQI
15th April 2025
31AQI
31AQI
16th April 2025
11AQI
11AQI
17th April 2025
14AQI
14AQI
18th April 2025
22AQI
22AQI
19th April 2025
49AQI
49AQI
20th April 2025
21AQI
21AQI
21st April 2025
16AQI
16AQI
22nd April 2025
42AQI
42AQI
23rd April 2025
26AQI
26AQI
24th April 2025
22AQI
22AQI
25th April 2025
54AQI
54AQI
26th April 2025
31AQI
31AQI
27th April 2025
12AQI
12AQI
28th April 2025
20AQI
20AQI
29th April 2025
28AQI
28AQI
30th April 2025
25AQI
25AQI
1st May 2025
18AQI
18AQI
2nd May 2025
41AQI
41AQI
3rd May 2025
46AQI
46AQI
4th May 2025
36AQI
36AQI
5th May 2025
26AQI
26AQI
6th May 2025
32AQI
32AQI
7th May 2025
28AQI
28AQI
8th May 2025
24AQI
24AQI
9th May 2025
31AQI
31AQI
10th May 2025
16AQI
16AQI
11th May 2025
21AQI
21AQI
12th May 2025
21AQI
21AQI
13th May 2025
28AQI
28AQI
14th May 2025
29AQI
29AQI
15th May 2025
39AQI
39AQI
16th May 2025
34AQI
34AQI
17th May 2025
35AQI
35AQI
18th May 2025
19AQI
19AQI
19th May 2025
14AQI
14AQI
20th May 2025
14AQI
14AQI
21st May 2025
17AQI
17AQI
22nd May 2025
20AQI
20AQI
23rd May 2025
14AQI
14AQI
24th May 2025
14AQI
14AQI
25th May 2025
13AQI
13AQI
26th May 2025
19AQI
19AQI
27th May 2025
26AQI
26AQI
28th May 2025
27AQI
27AQI
29th May 2025
24AQI
24AQI
30th May 2025
33AQI
33AQI
31st May 2025
20AQI
20AQI
1st June 2025
13AQI
13AQI
2nd June 2025
18AQI
18AQI
3rd June 2025
24AQI
24AQI
4th June 2025
39AQI
39AQI
5th June 2025
57AQI
57AQI
6th June 2025
62AQI
62AQI
7th June 2025
53AQI
53AQI
8th June 2025
89AQI
89AQI
9th June 2025
82AQI
82AQI
10th June 2025
54AQI
54AQI
11th June 2025
52AQI
52AQI
12th June 2025
71AQI
71AQI
13th June 2025
52AQI
52AQI
14th June 2025
46AQI
46AQI
15th June 2025
30AQI
30AQI
16th June 2025
32AQI
32AQI
17th June 2025
29AQI
29AQI
18th June 2025
25AQI
25AQI
19th June 2025
28AQI
28AQI
20th June 2025
33AQI
33AQI
21st June 2025
52AQI
52AQI
22nd June 2025
54AQI
54AQI
23rd June 2025
51AQI
51AQI
24th June 2025
56AQI
56AQI
25th June 2025
52AQI
52AQI
26th June 2025
39AQI
39AQI
27th June 2025
26AQI
26AQI
28th June 2025
27AQI
27AQI
29th June 2025
39AQI
39AQI
30th June 2025
39AQI
39AQI
1st July 2025
39AQI
39AQI
2nd July 2025
33AQI
33AQI
3rd July 2025
44AQI
44AQI
4th July 2025
45AQI
45AQI
5th July 2025
51AQI
51AQI
6th July 2025
59AQI
59AQI
7th July 2025
45AQI
45AQI
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
23AQI
23AQI
15th July 2025
29AQI
29AQI
16th July 2025
35AQI
35AQI
17th July 2025
37AQI
37AQI
18th July 2025
21AQI
21AQI
19th July 2025
27AQI
27AQI
20th July 2025
20AQI
20AQI
21st July 2025
30AQI
30AQI
22nd July 2025
19AQI
19AQI
23rd July 2025
25AQI
25AQI
24th July 2025
28AQI
28AQI
25th July 2025
37AQI
37AQI
26th July 2025
77AQI
77AQI
27th July 2025
80AQI
80AQI
28th July 2025
73AQI
73AQI
29th July 2025
61AQI
61AQI
30th July 2025
54AQI
54AQI
31st July 2025
68AQI
68AQI
1st August 2025
58AQI
58AQI
2nd August 2025
33AQI
33AQI
3rd August 2025
54AQI
54AQI
4th August 2025
76AQI
76AQI
5th August 2025
82AQI
82AQI
6th August 2025
50AQI
50AQI
7th August 2025
66AQI
66AQI
35AQI
32AQI
26AQI
23AQI
25AQI
44AQI
40AQI
60AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202533AQI
25
6
28
31
29
1
31
16
14
23
8
2
5
185
34
Highest AQI recorded in
August60AQI
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.)
31AQIBoston's annual 2025 AQI (33) shows an average percentage change of 0.3% (worsened AQI) compared to previous years: 2020 (34), 2021 (33), 2022 (33), 2023 (35), 2024 (31).
