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+
November Air Quality Analysis
Boston, Chelsea, Massachusetts, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
11th Nov 2024
143AQILowest AQI recorded on
19th Nov 2023
17AQISame Day Analysis (4th November ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 18 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: 4th Nov - 5th Nov 2025
Boston, Chelsea, Massachusetts, United States
AQI
Day
Night
.
7 AM4th Nov 2025
5 PM
6 AM5th Nov 2025
Day time
Avg. Highest Time
4PM4th Nov
24AQI
Avg. Lowest Time
8AM4th Nov
11AQI
Night time
Avg. Highest Time
11PM4th Nov
39AQI
Avg. Lowest Time
5PM4th Nov
18AQI
In the last 24 hours,
Boston's AQI reached its highest point of 39 at 11 PM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Day between 4th Nov and 5th Nov 2025.
Day & Night AQI Trend : Oct - Nov 2025
Boston, Chelsea, Massachusetts, United States
OctNov
06th - 07th07th - 08th08th - 09th09th - 10th10th - 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
Day
Night
6th Oct 2025637 AMAQI
6th Oct 2025608 AMAQI
6th Oct 2025659 AMAQI
6th Oct 20256010 AMAQI
6th Oct 20255711 AMAQI
6th Oct 20255512 PMAQI
6th Oct 2025551 PMAQI
21°C14/28°C
7th Oct 2025467 AMAQI
7th Oct 2025388 AMAQI
7th Oct 2025429 AMAQI
7th Oct 20254910 AMAQI
7th Oct 20255211 AMAQI
7th Oct 20255612 PMAQI
7th Oct 2025541 PMAQI
7th Oct 2025552 PMAQI
7th Oct 2025543 PMAQI
7th Oct 2025524 PMAQI
7th Oct 2025525 PMAQI
7th Oct 2025446 PMAQI
7th Oct 2025487 PMAQI
7th Oct 2025408 PMAQI
7th Oct 2025189 PMAQI
7th Oct 20251010 PMAQI
7th Oct 20251011 PMAQI
8th Oct 2025812 AMAQI
8th Oct 202571 AMAQI
8th Oct 202572 AMAQI
8th Oct 2025303 AMAQI
8th Oct 2025154 AMAQI
8th Oct 202585 AMAQI
8th Oct 202586 AMAQI
21°C15/30°C
8th Oct 202597 AMAQI
8th Oct 2025348 AMAQI
8th Oct 2025169 AMAQI
8th Oct 20253210 AMAQI
8th Oct 20254811 AMAQI
8th Oct 20251812 PMAQI
8th Oct 2025131 PMAQI
8th Oct 202592 PMAQI
8th Oct 202583 PMAQI
8th Oct 2025134 PMAQI
8th Oct 202595 PMAQI
8th Oct 2025116 PMAQI
8th Oct 202597 PMAQI
8th Oct 202568 PMAQI
8th Oct 2025319 PMAQI
8th Oct 20254710 PMAQI
8th Oct 20254011 PMAQI
9th Oct 20253812 AMAQI
9th Oct 2025371 AMAQI
9th Oct 2025152 AMAQI
9th Oct 202563 AMAQI
9th Oct 2025164 AMAQI
9th Oct 2025215 AMAQI
9th Oct 2025226 AMAQI
17°C10/21°C
9th Oct 2025247 AMAQI
9th Oct 2025238 AMAQI
9th Oct 2025169 AMAQI
9th Oct 20251210 AMAQI
9th Oct 2025911 AMAQI
9th Oct 2025812 PMAQI
9th Oct 2025161 PMAQI
9th Oct 2025342 PMAQI
9th Oct 2025373 PMAQI
9th Oct 2025374 PMAQI
9th Oct 2025275 PMAQI
9th Oct 2025166 PMAQI
9th Oct 2025107 PMAQI
9th Oct 2025358 PMAQI
9th Oct 2025389 PMAQI
9th Oct 20254510 PMAQI
9th Oct 20253911 PMAQI
10th Oct 20254612 AMAQI
10th Oct 2025401 AMAQI
10th Oct 2025312 AMAQI
10th Oct 2025123 AMAQI
10th Oct 202564 AMAQI
10th Oct 202565 AMAQI
10th Oct 202576 AMAQI
9°C6/16°C
10th Oct 202577 AMAQI
10th Oct 202578 AMAQI
10th Oct 2025109 AMAQI
10th Oct 20251810 AMAQI
10th Oct 20253911 AMAQI
10th Oct 20253712 PMAQI
10th Oct 2025401 PMAQI
10th Oct 2025232 PMAQI
10th Oct 2025123 PMAQI
10th Oct 2025134 PMAQI
10th Oct 2025115 PMAQI
10th Oct 2025166 PMAQI
10th Oct 2025127 PMAQI
10th Oct 2025128 PMAQI
10th Oct 2025339 PMAQI
10th Oct 20251510 PMAQI
10th Oct 20251011 PMAQI
11th Oct 20253612 AMAQI
11th Oct 2025391 AMAQI
11th Oct 2025412 AMAQI
11th Oct 2025363 AMAQI
11th Oct 2025174 AMAQI
11th Oct 202565 AMAQI
11th Oct 202566 AMAQI
9°C1/17°C
11th Oct 202567 AMAQI
11th Oct 2025268 AMAQI
11th Oct 2025139 AMAQI
11th Oct 2025710 AMAQI
11th Oct 20253011 AMAQI
11th Oct 20253812 PMAQI
11th Oct 2025221 PMAQI
11th Oct 2025112 PMAQI
11th Oct 2025183 PMAQI
11th Oct 2025384 PMAQI
11th Oct 2025525 PMAQI
11th Oct 2025556 PMAQI
11th Oct 2025427 PMAQI
11th Oct 2025458 PMAQI
11th Oct 2025449 PMAQI
11th Oct 20254210 PMAQI
11th Oct 20254811 PMAQI
12th Oct 20255212 AMAQI
12th Oct 2025561 AMAQI
12th Oct 2025542 AMAQI
12th Oct 2025443 AMAQI
12th Oct 2025144 AMAQI
12th Oct 202595 AMAQI
12th Oct 202586 AMAQI
13°C8/20°C
12th Oct 2025107 AMAQI
12th Oct 2025228 AMAQI
12th Oct 2025239 AMAQI
12th Oct 20252210 AMAQI
12th Oct 20251611 AMAQI
12th Oct 20251612 PMAQI
12th Oct 2025151 PMAQI
12th Oct 2025182 PMAQI
12th Oct 2025353 PMAQI
12th Oct 2025384 PMAQI
12th Oct 2025405 PMAQI
12th Oct 2025446 PMAQI
12th Oct 2025467 PMAQI
12th Oct 2025528 PMAQI
12th Oct 2025529 PMAQI
12th Oct 20255610 PMAQI
12th Oct 20255711 PMAQI
13th Oct 20255812 AMAQI
13th Oct 2025571 AMAQI
13th Oct 2025522 AMAQI
13th Oct 2025513 AMAQI
13th Oct 2025504 AMAQI
13th Oct 2025485 AMAQI
13th Oct 2025496 AMAQI
13°C10/15°C
13th Oct 2025537 AMAQI
13th Oct 2025568 AMAQI
13th Oct 2025569 AMAQI
13th Oct 20255610 AMAQI
13th Oct 20255411 AMAQI
13th Oct 20254912 PMAQI
13th Oct 2025421 PMAQI
13th Oct 2025422 PMAQI
13th Oct 2025423 PMAQI
13th Oct 2025404 PMAQI
13th Oct 2025385 PMAQI
13th Oct 2025306 PMAQI
13th Oct 2025297 PMAQI
13th Oct 2025198 PMAQI
13th Oct 2025269 PMAQI
13th Oct 20252810 PMAQI
13th Oct 20252411 PMAQI
14th Oct 20252612 AMAQI
14th Oct 2025281 AMAQI
14th Oct 2025272 AMAQI
14th Oct 2025253 AMAQI
14th Oct 2025264 AMAQI
14th Oct 2025275 AMAQI
14th Oct 2025266 AMAQI
13°C12/14°C
14th Oct 2025277 AMAQI
14th Oct 2025308 AMAQI
14th Oct 2025279 AMAQI
14th Oct 20251610 AMAQI
14th Oct 2025611 AMAQI
14th Oct 20251812 PMAQI
14th Oct 2025341 PMAQI
14th Oct 2025352 PMAQI
14th Oct 2025383 PMAQI
14th Oct 2025504 PMAQI
14th Oct 2025445 PMAQI
14th Oct 2025206 PMAQI
14th Oct 2025307 PMAQI
14th Oct 2025208 PMAQI
14th Oct 2025359 PMAQI
14th Oct 20253810 PMAQI
14th Oct 20255211 PMAQI
15th Oct 20255012 AMAQI
15th Oct 2025441 AMAQI
15th Oct 2025422 AMAQI
15th Oct 2025133 AMAQI
15th Oct 202594 AMAQI
15th Oct 2025105 AMAQI
15th Oct 2025266 AMAQI
13°C11/15°C
15th Oct 2025427 AMAQI
15th Oct 2025408 AMAQI
15th Oct 2025189 AMAQI
15th Oct 2025810 AMAQI
15th Oct 2025911 AMAQI
15th Oct 20254012 PMAQI
15th Oct 2025461 PMAQI
15th Oct 2025412 PMAQI
15th Oct 2025483 PMAQI
15th Oct 2025444 PMAQI
15th Oct 2025445 PMAQI
15th Oct 2025246 PMAQI
15th Oct 2025157 PMAQI
15th Oct 202568 PMAQI
15th Oct 202569 PMAQI
15th Oct 2025610 PMAQI
15th Oct 2025611 PMAQI
16th Oct 2025712 AMAQI
16th Oct 2025201 AMAQI
16th Oct 2025202 AMAQI
16th Oct 2025143 AMAQI
16th Oct 2025184 AMAQI
16th Oct 2025325 AMAQI
16th Oct 2025186 AMAQI
12°C6/17°C
16th Oct 202577 AMAQI
16th Oct 202588 AMAQI
16th Oct 2025189 AMAQI
16th Oct 2025810 AMAQI
16th Oct 20251111 AMAQI
16th Oct 20251812 PMAQI
16th Oct 2025191 PMAQI
16th Oct 2025122 PMAQI
16th Oct 2025163 PMAQI
16th Oct 2025164 PMAQI
16th Oct 2025205 PMAQI
16th Oct 2025186 PMAQI
16th Oct 2025197 PMAQI
16th Oct 2025158 PMAQI
16th Oct 2025199 PMAQI
16th Oct 20251710 PMAQI
16th Oct 20251511 PMAQI
17th Oct 2025812 AMAQI
17th Oct 2025231 AMAQI
17th Oct 2025262 AMAQI
17th Oct 202573 AMAQI
17th Oct 2025194 AMAQI
17th Oct 2025165 AMAQI
17th Oct 202586 AMAQI
9°C5/14°C
17th Oct 202577 AMAQI
17th Oct 2025118 AMAQI
17th Oct 2025119 AMAQI
17th Oct 20251510 AMAQI
17th Oct 20251311 AMAQI
17th Oct 20251412 PMAQI
17th Oct 2025321 PMAQI
17th Oct 2025352 PMAQI
17th Oct 2025203 PMAQI
17th Oct 2025184 PMAQI
17th Oct 2025185 PMAQI
17th Oct 2025246 PMAQI
17th Oct 2025427 PMAQI
17th Oct 2025498 PMAQI
17th Oct 2025529 PMAQI
17th Oct 20255410 PMAQI
17th Oct 20255611 PMAQI
18th Oct 20256012 AMAQI
18th Oct 2025571 AMAQI
18th Oct 2025452 AMAQI
18th Oct 2025483 AMAQI
18th Oct 2025374 AMAQI
18th Oct 2025475 AMAQI
18th Oct 2025446 AMAQI
11°C6/18°C
18th Oct 2025267 AMAQI
18th Oct 2025258 AMAQI
18th Oct 2025349 AMAQI
18th Oct 20253310 AMAQI
18th Oct 20254111 AMAQI
18th Oct 20254012 PMAQI
18th Oct 2025321 PMAQI
18th Oct 2025362 PMAQI
18th Oct 2025273 PMAQI
18th Oct 2025114 PMAQI
18th Oct 2025315 PMAQI
18th Oct 2025426 PMAQI
18th Oct 2025447 PMAQI
18th Oct 2025488 PMAQI
18th Oct 2025469 PMAQI
18th Oct 20254910 PMAQI
18th Oct 20255311 PMAQI
19th Oct 20255312 AMAQI
19th Oct 2025541 AMAQI
19th Oct 2025542 AMAQI
19th Oct 2025533 AMAQI
19th Oct 2025524 AMAQI
19th Oct 2025505 AMAQI
19th Oct 2025516 AMAQI
10°C4/19°C
19th Oct 2025517 AMAQI
19th Oct 2025438 AMAQI
19th Oct 2025409 AMAQI
19th Oct 20253710 AMAQI
19th Oct 20253711 AMAQI
19th Oct 20253112 PMAQI
19th Oct 2025281 PMAQI
19th Oct 2025282 PMAQI
19th Oct 2025243 PMAQI
19th Oct 2025244 PMAQI
19th Oct 2025265 PMAQI
19th Oct 2025266 PMAQI
19th Oct 2025247 PMAQI
19th Oct 2025228 PMAQI
19th Oct 2025239 PMAQI
19th Oct 20252110 PMAQI
19th Oct 20252311 PMAQI
20th Oct 20252312 AMAQI
20th Oct 2025221 AMAQI
20th Oct 2025232 AMAQI
20th Oct 2025253 AMAQI
20th Oct 2025234 AMAQI
20th Oct 2025245 AMAQI
20th Oct 2025236 AMAQI
13°C7/21°C
20th Oct 2025237 AMAQI
20th Oct 2025168 AMAQI
20th Oct 2025139 AMAQI
20th Oct 20251210 AMAQI
20th Oct 20251211 AMAQI
20th Oct 20251412 PMAQI
20th Oct 2025201 PMAQI
20th Oct 2025252 PMAQI
20th Oct 2025263 PMAQI
20th Oct 2025254 PMAQI
20th Oct 2025255 PMAQI
20th Oct 2025346 PMAQI
20th Oct 2025267 PMAQI
20th Oct 2025288 PMAQI
20th Oct 2025259 PMAQI
20th Oct 20253010 PMAQI
20th Oct 20252611 PMAQI
21st Oct 20252712 AMAQI
21st Oct 2025261 AMAQI
21st Oct 2025252 AMAQI
21st Oct 2025253 AMAQI
21st Oct 2025254 AMAQI
21st Oct 2025245 AMAQI
21st Oct 2025256 AMAQI
15°C11/19°C
21st Oct 2025267 AMAQI
21st Oct 2025258 AMAQI
21st Oct 2025269 AMAQI
21st Oct 20253310 AMAQI
21st Oct 20253211 AMAQI
21st Oct 20252812 PMAQI
21st Oct 2025301 PMAQI
21st Oct 2025242 PMAQI
21st Oct 2025223 PMAQI
21st Oct 2025224 PMAQI
21st Oct 2025225 PMAQI
21st Oct 2025276 PMAQI
21st Oct 2025267 PMAQI
21st Oct 2025208 PMAQI
21st Oct 2025269 PMAQI
21st Oct 20253210 PMAQI
21st Oct 20253811 PMAQI
22nd Oct 20253812 AMAQI
22nd Oct 2025391 AMAQI
22nd Oct 2025342 AMAQI
22nd Oct 2025383 AMAQI
22nd Oct 2025444 AMAQI
22nd Oct 2025405 AMAQI
22nd Oct 2025346 AMAQI
12°C9/17°C
22nd Oct 2025427 AMAQI
22nd Oct 2025408 AMAQI
22nd Oct 2025399 AMAQI
22nd Oct 20252510 AMAQI
22nd Oct 20252711 AMAQI
22nd Oct 20253712 PMAQI
22nd Oct 2025341 PMAQI
22nd Oct 2025422 PMAQI
22nd Oct 2025443 PMAQI
22nd Oct 2025414 PMAQI
22nd Oct 2025355 PMAQI
22nd Oct 2025356 PMAQI
22nd Oct 2025287 PMAQI
22nd Oct 2025288 PMAQI
22nd Oct 2025309 PMAQI
22nd Oct 20252910 PMAQI
22nd Oct 20252811 PMAQI
23rd Oct 20253812 AMAQI
23rd Oct 2025251 AMAQI
23rd Oct 2025312 AMAQI
23rd Oct 2025303 AMAQI
23rd Oct 2025224 AMAQI
23rd Oct 2025245 AMAQI
23rd Oct 2025306 AMAQI
13°C9/18°C
23rd Oct 2025337 AMAQI
23rd Oct 2025298 AMAQI
23rd Oct 2025289 AMAQI
23rd Oct 20253210 AMAQI
23rd Oct 20253311 AMAQI
23rd Oct 20253312 PMAQI
23rd Oct 2025331 PMAQI
23rd Oct 2025292 PMAQI
23rd Oct 2025283 PMAQI
23rd Oct 2025264 PMAQI
23rd Oct 2025275 PMAQI
23rd Oct 2025266 PMAQI
23rd Oct 2025227 PMAQI
23rd Oct 2025278 PMAQI
23rd Oct 2025329 PMAQI
23rd Oct 20253310 PMAQI
23rd Oct 20252911 PMAQI
24th Oct 20253212 AMAQI
24th Oct 2025331 AMAQI
24th Oct 2025332 AMAQI
24th Oct 2025293 AMAQI
24th Oct 2025284 AMAQI
24th Oct 2025285 AMAQI
24th Oct 2025286 AMAQI
11°C7/16°C
24th Oct 2025287 AMAQI
24th Oct 2025288 AMAQI
24th Oct 2025289 AMAQI
24th Oct 20253710 AMAQI
24th Oct 20253711 AMAQI
24th Oct 20253312 PMAQI
24th Oct 2025481 PMAQI
24th Oct 2025392 PMAQI
24th Oct 2025243 PMAQI
24th Oct 2025284 PMAQI
24th Oct 2025265 PMAQI
24th Oct 2025256 PMAQI
24th Oct 2025297 PMAQI
24th Oct 2025248 PMAQI
24th Oct 2025289 PMAQI
24th Oct 20254110 PMAQI
24th Oct 20254411 PMAQI
25th Oct 20254012 AMAQI
25th Oct 2025391 AMAQI
25th Oct 2025342 AMAQI
25th Oct 2025293 AMAQI
25th Oct 2025284 AMAQI
25th Oct 2025285 AMAQI
25th Oct 2025236 AMAQI
10°C4/16°C
25th Oct 2025227 AMAQI
25th Oct 2025188 AMAQI
25th Oct 2025279 AMAQI
25th Oct 20252810 AMAQI
25th Oct 20252311 AMAQI
25th Oct 20252212 PMAQI
25th Oct 2025221 PMAQI
25th Oct 2025242 PMAQI
25th Oct 2025263 PMAQI
25th Oct 2025274 PMAQI
25th Oct 2025235 PMAQI
25th Oct 2025226 PMAQI
25th Oct 2025227 PMAQI
25th Oct 2025298 PMAQI
25th Oct 2025499 PMAQI
25th Oct 20255310 PMAQI
25th Oct 20254711 PMAQI
26th Oct 20255612 AMAQI
26th Oct 2025471 AMAQI
26th Oct 2025492 AMAQI
26th Oct 2025453 AMAQI
26th Oct 2025424 AMAQI
26th Oct 2025395 AMAQI
26th Oct 2025436 AMAQI
9°C3/14°C
26th Oct 2025407 AMAQI
26th Oct 2025348 AMAQI
26th Oct 2025289 AMAQI
26th Oct 20253210 AMAQI
26th Oct 20252811 AMAQI
26th Oct 20252812 PMAQI
26th Oct 2025231 PMAQI
26th Oct 2025222 PMAQI
26th Oct 2025223 PMAQI
26th Oct 2025244 PMAQI
26th Oct 2025265 PMAQI
26th Oct 2025276 PMAQI
26th Oct 2025327 PMAQI
26th Oct 2025438 PMAQI
26th Oct 2025509 PMAQI
26th Oct 20255010 PMAQI
26th Oct 20254511 PMAQI
27th Oct 20254012 AMAQI
27th Oct 2025391 AMAQI
27th Oct 2025342 AMAQI
27th Oct 2025333 AMAQI
27th Oct 2025284 AMAQI
27th Oct 2025285 AMAQI
27th Oct 2025286 AMAQI
8°C3/13°C
27th Oct 2025237 AMAQI
27th Oct 2025228 AMAQI
27th Oct 2025279 AMAQI
27th Oct 20253010 AMAQI
27th Oct 20253811 AMAQI
27th Oct 20255012 PMAQI
27th Oct 2025371 PMAQI
27th Oct 2025292 PMAQI
27th Oct 2025283 PMAQI
27th Oct 2025234 PMAQI
27th Oct 2025225 PMAQI
27th Oct 2025226 PMAQI
27th Oct 2025277 PMAQI
27th Oct 2025288 PMAQI
27th Oct 2025369 PMAQI
27th Oct 20254810 PMAQI
27th Oct 20254511 PMAQI
28th Oct 20254412 AMAQI
28th Oct 2025401 AMAQI
28th Oct 2025342 AMAQI
28th Oct 2025293 AMAQI
28th Oct 2025284 AMAQI
28th Oct 2025285 AMAQI
28th Oct 2025326 AMAQI
7°C1/14°C
28th Oct 2025237 AMAQI
28th Oct 2025228 AMAQI
28th Oct 2025189 AMAQI
28th Oct 20252110 AMAQI
28th Oct 20252211 AMAQI
28th Oct 20252712 PMAQI
28th Oct 2025281 PMAQI
28th Oct 2025282 PMAQI
28th Oct 2025313 PMAQI
28th Oct 2025294 PMAQI
28th Oct 2025235 PMAQI
28th Oct 2025276 PMAQI
28th Oct 2025287 PMAQI
28th Oct 2025288 PMAQI
28th Oct 2025289 PMAQI
28th Oct 20252810 PMAQI
28th Oct 20253211 PMAQI
29th Oct 20253312 AMAQI
29th Oct 2025381 AMAQI
29th Oct 2025302 AMAQI
29th Oct 2025283 AMAQI
29th Oct 2025284 AMAQI
29th Oct 2025285 AMAQI
29th Oct 2025376 AMAQI
8°C3/12°C
29th Oct 2025307 AMAQI
29th Oct 2025288 AMAQI
29th Oct 2025289 AMAQI
29th Oct 20252810 AMAQI
29th Oct 20253211 AMAQI
29th Oct 20253312 PMAQI
29th Oct 2025351 PMAQI
29th Oct 2025392 PMAQI
29th Oct 2025523 PMAQI
29th Oct 2025514 PMAQI
29th Oct 2025415 PMAQI
29th Oct 2025396 PMAQI
29th Oct 2025397 PMAQI
29th Oct 2025438 PMAQI
29th Oct 2025539 PMAQI
29th Oct 20255310 PMAQI
29th Oct 20254211 PMAQI
30th Oct 20253912 AMAQI
30th Oct 2025391 AMAQI
30th Oct 2025392 AMAQI
30th Oct 2025343 AMAQI
30th Oct 2025334 AMAQI
30th Oct 2025335 AMAQI
30th Oct 2025336 AMAQI
9°C8/10°C
30th Oct 2025337 AMAQI
30th Oct 2025338 AMAQI
30th Oct 2025339 AMAQI
30th Oct 20252910 AMAQI
30th Oct 20252811 AMAQI
30th Oct 20252812 PMAQI
30th Oct 2025281 PMAQI
30th Oct 2025282 PMAQI
30th Oct 2025373 PMAQI
30th Oct 2025434 PMAQI
30th Oct 2025405 PMAQI
30th Oct 2025396 PMAQI
30th Oct 2025427 PMAQI
30th Oct 2025448 PMAQI
30th Oct 2025449 PMAQI
30th Oct 20253510 PMAQI
30th Oct 20253311 PMAQI
31st Oct 20252912 AMAQI
31st Oct 2025231 AMAQI
31st Oct 2025272 AMAQI
31st Oct 2025303 AMAQI
31st Oct 2025294 AMAQI
31st Oct 2025225 AMAQI
31st Oct 2025226 AMAQI
11°C9/11°C
31st Oct 2025227 AMAQI
31st Oct 2025208 AMAQI
31st Oct 2025179 AMAQI
31st Oct 20251810 AMAQI
31st Oct 20252211 AMAQI
31st Oct 20252612 PMAQI
31st Oct 2025331 PMAQI
31st Oct 2025322 PMAQI
31st Oct 2025283 PMAQI
31st Oct 2025244 PMAQI
31st Oct 2025175 PMAQI
31st Oct 2025186 PMAQI
31st Oct 2025227 PMAQI
31st Oct 2025188 PMAQI
31st Oct 2025119 PMAQI
31st Oct 20252110 PMAQI
31st Oct 20252211 PMAQI
1st Nov 20251812 AMAQI
1st Nov 2025111 AMAQI
1st Nov 2025112 AMAQI
1st Nov 2025113 AMAQI
1st Nov 2025114 AMAQI
1st Nov 2025115 AMAQI
1st Nov 2025116 AMAQI
12°C8/17°C
1st Nov 2025117 AMAQI
1st Nov 2025118 AMAQI
1st Nov 2025119 AMAQI
1st Nov 20251310 AMAQI
1st Nov 20251511 AMAQI
1st Nov 20251312 PMAQI
1st Nov 2025171 PMAQI
1st Nov 2025192 PMAQI
1st Nov 2025223 PMAQI
1st Nov 2025224 PMAQI
1st Nov 2025225 PMAQI
1st Nov 2025226 PMAQI
1st Nov 2025227 PMAQI
1st Nov 2025228 PMAQI
1st Nov 2025319 PMAQI
1st Nov 20253310 PMAQI
1st Nov 20253311 PMAQI
2nd Nov 20253312 AMAQI
2nd Nov 2025311 AMAQI
2nd Nov 2025232 AMAQI
2nd Nov 2025183 AMAQI
2nd Nov 2025224 AMAQI
2nd Nov 2025205 AMAQI
2nd Nov 2025176 AMAQI
9°C5/16°C
2nd Nov 2025177 AMAQI
2nd Nov 2025178 AMAQI
2nd Nov 2025179 AMAQI
2nd Nov 20251710 AMAQI
2nd Nov 20251711 AMAQI
2nd Nov 20251712 PMAQI
2nd Nov 2025171 PMAQI
2nd Nov 2025182 PMAQI
2nd Nov 2025223 PMAQI
2nd Nov 2025224 PMAQI
2nd Nov 2025225 PMAQI
2nd Nov 2025276 PMAQI
2nd Nov 2025287 PMAQI
2nd Nov 2025398 PMAQI
2nd Nov 2025519 PMAQI
2nd Nov 20255010 PMAQI
2nd Nov 20255011 PMAQI
3rd Nov 20254512 AMAQI
3rd Nov 2025491 AMAQI
3rd Nov 2025452 AMAQI
3rd Nov 2025403 AMAQI
3rd Nov 2025434 AMAQI
3rd Nov 2025495 AMAQI
3rd Nov 2025506 AMAQI
7°C2/13°C
3rd Nov 2025417 AMAQI
3rd Nov 2025438 AMAQI
3rd Nov 2025449 AMAQI
3rd Nov 20255110 AMAQI
3rd Nov 20255011 AMAQI
3rd Nov 20255012 PMAQI
3rd Nov 2025451 PMAQI
3rd Nov 2025402 PMAQI
3rd Nov 2025393 PMAQI
3rd Nov 2025394 PMAQI
3rd Nov 2025395 PMAQI
3rd Nov 2025346 PMAQI
3rd Nov 2025337 PMAQI
3rd Nov 2025338 PMAQI
3rd Nov 2025339 PMAQI
3rd Nov 20253210 PMAQI
3rd Nov 20252811 PMAQI
4th Nov 20252812 AMAQI
4th Nov 2025231 AMAQI
4th Nov 2025222 AMAQI
4th Nov 2025183 AMAQI
4th Nov 2025124 AMAQI
4th Nov 2025115 AMAQI
4th Nov 2025116 AMAQI
7°C1/14°C
4th Nov 2025117 AMAQI
4th Nov 2025118 AMAQI
4th Nov 2025219 AMAQI
4th Nov 20251810 AMAQI
4th Nov 20251811 AMAQI
4th Nov 20251812 PMAQI
4th Nov 2025171 PMAQI
4th Nov 2025172 PMAQI
4th Nov 2025183 PMAQI
4th Nov 2025244 PMAQI
4th Nov 2025185 PMAQI
4th Nov 2025206 PMAQI
4th Nov 2025267 PMAQI
4th Nov 2025278 PMAQI
4th Nov 2025289 PMAQI
4th Nov 20253110 PMAQI
4th Nov 20253911 PMAQI
5th Nov 20252412 AMAQI
5th Nov 2025221 AMAQI
5th Nov 2025252 AMAQI
9°C5/16°C
7 AM
12 PM
5 PM
12 AM
6 AM
--°C/°C
Day time
Avg. Highest Time
1 PM
31AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
9 AM
26AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 PM to 1 PM (Avg. 31), while the lowest AQI was between 9 AM to 9 AM (Avg. 26).
Night time
Avg. Highest Time
12 AM - 1 AM
36AQI
2 hours / Day
60 hours / Month
Avg. Lowest Time
4 AM - 6 AM
27AQI
3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 1 AM (Avg. 36), while the lowest AQI was between 4 AM to 6 AM (Avg. 27).
2025 Days Vs Air Quality
Boston, Chelsea, Massachusetts, United States
2025
87%
269
13%
39
Total number of days with different AQI categories in last 309 days in 2025 (56 days remaining)
Good
269 DaysModerate
39 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 309 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.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
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
8th August 2025
35AQI
35AQI
9th August 2025
33AQI
33AQI
10th August 2025
35AQI
35AQI
11th August 2025
52AQI
52AQI
12th August 2025
61AQI
61AQI
13th August 2025
50AQI
50AQI
14th August 2025
32AQI
32AQI
15th August 2025
43AQI
43AQI
16th August 2025
35AQI
35AQI
17th August 2025
51AQI
51AQI
18th August 2025
17AQI
17AQI
19th August 2025
16AQI
16AQI
20th August 2025
17AQI
17AQI
21st August 2025
21AQI
21AQI
22nd August 2025
30AQI
30AQI
23rd August 2025
40AQI
40AQI
24th August 2025
30AQI
30AQI
25th August 2025
32AQI
32AQI
26th August 2025
20AQI
20AQI
27th August 2025
20AQI
20AQI
28th August 2025
22AQI
22AQI
29th August 2025
27AQI
27AQI
30th August 2025
20AQI
20AQI
31st August 2025
23AQI
23AQI
1st September 2025
31AQI
31AQI
2nd September 2025
30AQI
30AQI
3rd September 2025
30AQI
30AQI
4th September 2025
28AQI
28AQI
5th September 2025
33AQI
33AQI
6th September 2025
48AQI
48AQI
7th September 2025
36AQI
36AQI
8th September 2025
25AQI
25AQI
9th September 2025
26AQI
26AQI
10th September 2025
26AQI
26AQI
11th September 2025
33AQI
33AQI
12th September 2025
34AQI
34AQI
13th September 2025
35AQI
35AQI
14th September 2025
41AQI
41AQI
15th September 2025
47AQI
47AQI
16th September 2025
34AQI
34AQI
17th September 2025
28AQI
28AQI
18th September 2025
22AQI
22AQI
19th September 2025
28AQI
28AQI
20th September 2025
19AQI
19AQI
21st September 2025
25AQI
25AQI
22nd September 2025
23AQI
23AQI
23rd September 2025
26AQI
26AQI
24th September 2025
29AQI
29AQI
25th September 2025
19AQI
19AQI
26th September 2025
25AQI
25AQI
27th September 2025
25AQI
25AQI
28th September 2025
27AQI
27AQI
29th September 2025
22AQI
22AQI
30th September 2025
20AQI
20AQI
1st October 2025
37AQI
37AQI
2nd October 2025
20AQI
20AQI
3rd October 2025
28AQI
28AQI
4th October 2025
46AQI
46AQI
5th October 2025
58AQI
58AQI
6th October 2025
60AQI
60AQI
7th October 2025
42AQI
42AQI
8th October 2025
18AQI
18AQI
9th October 2025
24AQI
24AQI
10th October 2025
19AQI
19AQI
11th October 2025
31AQI
31AQI
12th October 2025
35AQI
35AQI
13th October 2025
43AQI
43AQI
14th October 2025
29AQI
29AQI
15th October 2025
24AQI
24AQI
16th October 2025
17AQI
17AQI
17th October 2025
26AQI
26AQI
18th October 2025
42AQI
42AQI
19th October 2025
37AQI
37AQI
20th October 2025
23AQI
23AQI
21st October 2025
26AQI
26AQI
22nd October 2025
35AQI
35AQI
23rd October 2025
29AQI
29AQI
24th October 2025
31AQI
31AQI
25th October 2025
30AQI
30AQI
26th October 2025
38AQI
38AQI
27th October 2025
32AQI
32AQI
28th October 2025
29AQI
29AQI
29th October 2025
37AQI
37AQI
30th October 2025
36AQI
36AQI
31st October 2025
23AQI
23AQI
1st November 2025
18AQI
18AQI
2nd November 2025
27AQI
27AQI
3rd November 2025
41AQI
41AQI
4th November 2025
18AQI
18AQI
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025
35AQI
32AQI
26AQI
23AQI
25AQI
44AQI
40AQI
38AQI
29AQI
32AQI
26AQI
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
23
8
30
29
2
4
269
39
Highest AQI recorded in
June44AQI
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 -1.7% (improved AQI) compared to previous years: 2020 (34), 2021 (33), 2022 (33), 2023 (35), 2024 (31).
