Country Background

Boston, 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+

October Air Quality Analysis

Boston, Massachusetts, United States

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
1st Oct 2023
95AQI
Lowest AQI recorded on
23rd Oct 2023
11AQI


Same Day Analysis (17th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 25 of Good air quality, showing improvement over 2022 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 17th Oct - 18th Oct 2025

Boston, Massachusetts, United States

AQI
Day
Night
.

6 AM17th Oct 2025

6 PM

5 AM18th Oct 2025

Day time
Avg. Highest Time
2PM17th Oct

36AQI

Avg. Lowest Time
7AM17th Oct

7AQI

Night time
Avg. Highest Time
1AM18th Oct

58AQI

Avg. Lowest Time
6AM17th Oct

7AQI

In the last 24 hours,

Boston's AQI reached its highest point of 58 at 1 AM during the Night, while the lowest point, 7, was recorded at 7 AM during the Day between 17th Oct and 18th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Boston, Massachusetts, United States

SepOct
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 - 18th18th
Day
Night
18th Sep 2025206 AMAQI
18th Sep 2025207 AMAQI
18th Sep 2025198 AMAQI
18th Sep 2025209 AMAQI
18th Sep 20252110 AMAQI
18th Sep 20252211 AMAQI
18th Sep 20252312 PMAQI
18th Sep 2025231 PMAQI
18th Sep 2025212 PMAQI
18th Sep 2025203 PMAQI
18th Sep 2025204 PMAQI
18th Sep 2025205 PMAQI
18th Sep 2025216 PMAQI
18th Sep 2025217 PMAQI
18th Sep 2025218 PMAQI
18th Sep 2025229 PMAQI
18th Sep 20252210 PMAQI
18th Sep 20252311 PMAQI
19th Sep 20252312 AMAQI
19th Sep 2025261 AMAQI
19th Sep 2025262 AMAQI
19th Sep 2025263 AMAQI
19th Sep 2025274 AMAQI
19th Sep 2025275 AMAQI

21°C17/27°C

19th Sep 2025296 AMAQI
19th Sep 2025317 AMAQI
19th Sep 2025348 AMAQI
19th Sep 2025369 AMAQI
19th Sep 20253310 AMAQI
19th Sep 20253111 AMAQI
19th Sep 20252912 PMAQI
19th Sep 2025291 PMAQI
19th Sep 2025292 PMAQI
19th Sep 2025273 PMAQI
19th Sep 2025264 PMAQI
19th Sep 2025255 PMAQI
19th Sep 2025236 PMAQI
19th Sep 2025277 PMAQI
19th Sep 2025288 PMAQI
19th Sep 2025249 PMAQI
19th Sep 20252310 PMAQI
19th Sep 20252211 PMAQI
20th Sep 20252212 AMAQI
20th Sep 2025201 AMAQI
20th Sep 2025172 AMAQI
20th Sep 2025163 AMAQI
20th Sep 2025164 AMAQI
20th Sep 2025175 AMAQI

21°C17/25°C

20th Sep 2025176 AMAQI
20th Sep 2025187 AMAQI
20th Sep 2025198 AMAQI
20th Sep 2025199 AMAQI
20th Sep 20251810 AMAQI
20th Sep 20252111 AMAQI
20th Sep 20251812 PMAQI
20th Sep 2025181 PMAQI
20th Sep 2025182 PMAQI
20th Sep 2025183 PMAQI
20th Sep 2025184 PMAQI
20th Sep 2025185 PMAQI
20th Sep 2025196 PMAQI
20th Sep 2025197 PMAQI
20th Sep 2025188 PMAQI
20th Sep 2025209 PMAQI
20th Sep 20252010 PMAQI
20th Sep 20252211 PMAQI
21st Sep 20252312 AMAQI
21st Sep 2025271 AMAQI
21st Sep 2025292 AMAQI
21st Sep 2025283 AMAQI
21st Sep 2025274 AMAQI
21st Sep 2025295 AMAQI

16°C12/20°C

21st Sep 2025296 AMAQI
21st Sep 2025287 AMAQI
21st Sep 2025278 AMAQI
21st Sep 2025299 AMAQI
21st Sep 20252810 AMAQI
21st Sep 20252411 AMAQI
21st Sep 20252112 PMAQI
21st Sep 2025221 PMAQI
21st Sep 2025212 PMAQI
21st Sep 2025223 PMAQI
21st Sep 2025214 PMAQI
21st Sep 2025195 PMAQI
21st Sep 2025206 PMAQI
21st Sep 2025247 PMAQI
21st Sep 2025248 PMAQI
21st Sep 2025209 PMAQI
21st Sep 20252010 PMAQI
21st Sep 20252211 PMAQI
22nd Sep 20252312 AMAQI
22nd Sep 2025211 AMAQI
22nd Sep 2025202 AMAQI
22nd Sep 2025213 AMAQI
22nd Sep 2025214 AMAQI
22nd Sep 2025235 AMAQI

14°C6/20°C

22nd Sep 2025236 AMAQI
22nd Sep 2025257 AMAQI
22nd Sep 2025258 AMAQI
22nd Sep 2025279 AMAQI
22nd Sep 20252710 AMAQI
22nd Sep 20252611 AMAQI
22nd Sep 20252412 PMAQI
22nd Sep 2025221 PMAQI
22nd Sep 2025222 PMAQI
22nd Sep 2025213 PMAQI
22nd Sep 2025224 PMAQI
22nd Sep 2025225 PMAQI
22nd Sep 2025226 PMAQI
22nd Sep 2025227 PMAQI
22nd Sep 2025228 PMAQI
22nd Sep 2025229 PMAQI
22nd Sep 20252210 PMAQI
22nd Sep 20252211 PMAQI
23rd Sep 20252212 AMAQI
23rd Sep 2025211 AMAQI
23rd Sep 2025212 AMAQI
23rd Sep 2025213 AMAQI
23rd Sep 2025224 AMAQI
23rd Sep 2025225 AMAQI

15°C8/23°C

23rd Sep 2025236 AMAQI
23rd Sep 2025247 AMAQI
23rd Sep 2025258 AMAQI
23rd Sep 2025269 AMAQI
23rd Sep 20252810 AMAQI
23rd Sep 20252911 AMAQI
23rd Sep 20253212 PMAQI
23rd Sep 2025341 PMAQI
23rd Sep 2025362 PMAQI
23rd Sep 2025343 PMAQI
23rd Sep 2025344 PMAQI
23rd Sep 2025345 PMAQI
23rd Sep 2025346 PMAQI
23rd Sep 2025287 PMAQI
23rd Sep 2025288 PMAQI
23rd Sep 2025349 PMAQI
23rd Sep 20253510 PMAQI
23rd Sep 20253511 PMAQI
24th Sep 20253312 AMAQI
24th Sep 2025341 AMAQI
24th Sep 2025322 AMAQI
24th Sep 2025313 AMAQI
24th Sep 2025324 AMAQI
24th Sep 2025355 AMAQI

21°C15/30°C

24th Sep 2025346 AMAQI
24th Sep 2025317 AMAQI
24th Sep 2025328 AMAQI
24th Sep 2025319 AMAQI
24th Sep 20253210 AMAQI
24th Sep 20253011 AMAQI
24th Sep 20252912 PMAQI
24th Sep 2025291 PMAQI
24th Sep 2025312 PMAQI
24th Sep 2025313 PMAQI
24th Sep 2025304 PMAQI
24th Sep 2025305 PMAQI
24th Sep 2025316 PMAQI
24th Sep 2025317 PMAQI
24th Sep 2025308 PMAQI
24th Sep 2025299 PMAQI
24th Sep 20252810 PMAQI
24th Sep 20252811 PMAQI
25th Sep 20252712 AMAQI
25th Sep 2025271 AMAQI
25th Sep 2025242 AMAQI
25th Sep 2025233 AMAQI
25th Sep 2025224 AMAQI
25th Sep 2025205 AMAQI

18°C17/19°C

25th Sep 2025156 AMAQI
25th Sep 2025117 AMAQI
25th Sep 2025118 AMAQI
25th Sep 2025119 AMAQI
25th Sep 20251110 AMAQI
25th Sep 20251111 AMAQI
25th Sep 20251112 PMAQI
25th Sep 202591 PMAQI
25th Sep 2025142 PMAQI
25th Sep 2025173 PMAQI
25th Sep 2025154 PMAQI
25th Sep 2025185 PMAQI
25th Sep 2025176 PMAQI
25th Sep 2025177 PMAQI
25th Sep 2025188 PMAQI
25th Sep 2025209 PMAQI
25th Sep 20252010 PMAQI
25th Sep 20252211 PMAQI
26th Sep 20252612 AMAQI
26th Sep 2025311 AMAQI
26th Sep 2025322 AMAQI
26th Sep 2025263 AMAQI
26th Sep 2025204 AMAQI
26th Sep 2025175 AMAQI

20°C17/22°C

26th Sep 2025176 AMAQI
26th Sep 2025177 AMAQI
26th Sep 2025178 AMAQI
26th Sep 2025169 AMAQI
26th Sep 20252110 AMAQI
26th Sep 20252511 AMAQI
26th Sep 20252712 PMAQI
26th Sep 2025281 PMAQI
26th Sep 2025292 PMAQI
26th Sep 2025283 PMAQI
26th Sep 2025284 PMAQI
26th Sep 2025275 PMAQI
26th Sep 2025276 PMAQI
26th Sep 2025257 PMAQI
26th Sep 2025208 PMAQI
26th Sep 2025199 PMAQI
26th Sep 20251910 PMAQI
26th Sep 20251911 PMAQI
27th Sep 20251812 AMAQI
27th Sep 2025181 AMAQI
27th Sep 2025182 AMAQI
27th Sep 2025183 AMAQI
27th Sep 2025184 AMAQI
27th Sep 2025185 AMAQI

22°C18/29°C

27th Sep 2025186 AMAQI
27th Sep 2025187 AMAQI
27th Sep 2025188 AMAQI
27th Sep 2025189 AMAQI
27th Sep 20251810 AMAQI
27th Sep 20251711 AMAQI
27th Sep 20251812 PMAQI
27th Sep 2025191 PMAQI
27th Sep 2025232 PMAQI
27th Sep 2025233 PMAQI
27th Sep 2025234 PMAQI
27th Sep 2025275 PMAQI
27th Sep 2025286 PMAQI
27th Sep 2025287 PMAQI
27th Sep 2025308 PMAQI
27th Sep 2025319 PMAQI
27th Sep 20253010 PMAQI
27th Sep 20253111 PMAQI
28th Sep 20253112 AMAQI
28th Sep 2025321 AMAQI
28th Sep 2025302 AMAQI
28th Sep 2025313 AMAQI
28th Sep 2025264 AMAQI
28th Sep 2025255 AMAQI

20°C15/25°C

28th Sep 2025236 AMAQI
28th Sep 2025237 AMAQI
28th Sep 2025238 AMAQI
28th Sep 2025209 AMAQI
28th Sep 20251810 AMAQI
28th Sep 20251611 AMAQI
28th Sep 20252112 PMAQI
28th Sep 2025261 PMAQI
28th Sep 2025262 PMAQI
28th Sep 2025263 PMAQI
28th Sep 2025274 PMAQI
28th Sep 2025275 PMAQI
28th Sep 2025286 PMAQI
28th Sep 2025357 PMAQI
28th Sep 2025388 PMAQI
28th Sep 2025289 PMAQI
28th Sep 20253110 PMAQI
28th Sep 20253711 PMAQI
29th Sep 20253712 AMAQI
29th Sep 2025361 AMAQI
29th Sep 2025342 AMAQI
29th Sep 2025343 AMAQI
29th Sep 2025324 AMAQI
29th Sep 2025325 AMAQI

22°C17/29°C

29th Sep 2025336 AMAQI
29th Sep 2025317 AMAQI
29th Sep 2025178 AMAQI
29th Sep 2025199 AMAQI
29th Sep 20252010 AMAQI
29th Sep 20251711 AMAQI
29th Sep 20251512 PMAQI
29th Sep 2025131 PMAQI
29th Sep 2025172 PMAQI
29th Sep 2025173 PMAQI
29th Sep 2025124 PMAQI
29th Sep 2025125 PMAQI
29th Sep 2025136 PMAQI
29th Sep 2025137 PMAQI
29th Sep 2025128 PMAQI
29th Sep 2025129 PMAQI
29th Sep 20251110 PMAQI
29th Sep 20251111 PMAQI
30th Sep 20251112 AMAQI
30th Sep 2025111 AMAQI
30th Sep 2025112 AMAQI
30th Sep 2025113 AMAQI
30th Sep 2025124 AMAQI
30th Sep 2025245 AMAQI

21°C13/30°C

30th Sep 2025166 AMAQI
30th Sep 2025207 AMAQI
30th Sep 2025218 AMAQI
30th Sep 2025209 AMAQI
30th Sep 20252310 AMAQI
30th Sep 20252611 AMAQI
30th Sep 20252912 PMAQI
30th Sep 2025281 PMAQI
30th Sep 2025402 PMAQI
30th Sep 2025383 PMAQI
30th Sep 2025314 PMAQI
30th Sep 2025235 PMAQI
30th Sep 2025236 PMAQI
30th Sep 2025207 PMAQI
30th Sep 2025148 PMAQI
30th Sep 2025149 PMAQI
30th Sep 20252110 PMAQI
30th Sep 20252811 PMAQI
1st Oct 20252612 AMAQI
1st Oct 2025271 AMAQI
1st Oct 2025222 AMAQI
1st Oct 2025223 AMAQI
1st Oct 2025224 AMAQI
1st Oct 2025225 AMAQI

18°C14/24°C

1st Oct 2025256 AMAQI
1st Oct 2025237 AMAQI
1st Oct 2025218 AMAQI
1st Oct 2025249 AMAQI
1st Oct 20252210 AMAQI
1st Oct 20252011 AMAQI
1st Oct 20251712 PMAQI
1st Oct 2025151 PMAQI
1st Oct 2025292 PMAQI
1st Oct 2025253 PMAQI
1st Oct 2025384 PMAQI
1st Oct 2025505 PMAQI
1st Oct 2025826 PMAQI
1st Oct 2025747 PMAQI
1st Oct 2025708 PMAQI
1st Oct 2025709 PMAQI
1st Oct 20253110 PMAQI
1st Oct 20251311 PMAQI
2nd Oct 20251412 AMAQI
2nd Oct 202581 AMAQI
2nd Oct 202572 AMAQI
2nd Oct 202573 AMAQI
2nd Oct 202574 AMAQI
2nd Oct 202565 AMAQI

14°C9/20°C

2nd Oct 2025266 AMAQI
2nd Oct 2025347 AMAQI
2nd Oct 2025178 AMAQI
2nd Oct 2025109 AMAQI
2nd Oct 20251310 AMAQI
2nd Oct 20251211 AMAQI
2nd Oct 20253212 PMAQI
2nd Oct 2025191 PMAQI
2nd Oct 2025132 PMAQI
2nd Oct 2025133 PMAQI
2nd Oct 2025124 PMAQI
2nd Oct 2025115 PMAQI
2nd Oct 2025116 PMAQI
2nd Oct 2025127 PMAQI
2nd Oct 2025298 PMAQI
2nd Oct 2025509 PMAQI
2nd Oct 20254510 PMAQI
2nd Oct 20254411 PMAQI
3rd Oct 20254612 AMAQI
3rd Oct 2025421 AMAQI
3rd Oct 2025362 AMAQI
3rd Oct 2025173 AMAQI
3rd Oct 2025304 AMAQI
3rd Oct 2025175 AMAQI

12°C6/17°C

3rd Oct 202576 AMAQI
3rd Oct 202567 AMAQI
3rd Oct 2025308 AMAQI
3rd Oct 2025189 AMAQI
3rd Oct 20253210 AMAQI
3rd Oct 20253911 AMAQI
3rd Oct 20253912 PMAQI
3rd Oct 2025401 PMAQI
3rd Oct 2025432 PMAQI
3rd Oct 2025223 PMAQI
3rd Oct 2025164 PMAQI
3rd Oct 2025175 PMAQI
3rd Oct 2025186 PMAQI
3rd Oct 2025177 PMAQI
3rd Oct 2025338 PMAQI
3rd Oct 2025199 PMAQI
3rd Oct 20253410 PMAQI
3rd Oct 20254411 PMAQI
4th Oct 20254412 AMAQI
4th Oct 2025391 AMAQI
4th Oct 2025412 AMAQI
4th Oct 2025423 AMAQI
4th Oct 2025414 AMAQI
4th Oct 2025415 AMAQI

14°C6/23°C

4th Oct 2025406 AMAQI
4th Oct 2025407 AMAQI
4th Oct 2025398 AMAQI
4th Oct 2025379 AMAQI
4th Oct 20254110 AMAQI
4th Oct 20254511 AMAQI
4th Oct 20254712 PMAQI
4th Oct 2025451 PMAQI
4th Oct 2025452 PMAQI
4th Oct 2025453 PMAQI
4th Oct 2025474 PMAQI
4th Oct 2025465 PMAQI
4th Oct 2025426 PMAQI
4th Oct 2025407 PMAQI
4th Oct 2025448 PMAQI
4th Oct 2025479 PMAQI
4th Oct 20255610 PMAQI
4th Oct 20256011 PMAQI
5th Oct 20256112 AMAQI
5th Oct 2025601 AMAQI
5th Oct 2025622 AMAQI
5th Oct 2025553 AMAQI
5th Oct 2025504 AMAQI
5th Oct 2025515 AMAQI

19°C10/31°C

5th Oct 2025536 AMAQI
5th Oct 2025547 AMAQI
5th Oct 2025558 AMAQI
5th Oct 2025569 AMAQI
5th Oct 20255610 AMAQI
5th Oct 20255711 AMAQI
5th Oct 20255612 PMAQI
5th Oct 2025571 PMAQI
5th Oct 2025562 PMAQI
5th Oct 2025573 PMAQI
5th Oct 2025594 PMAQI
5th Oct 2025605 PMAQI
5th Oct 2025536 PMAQI
5th Oct 2025517 PMAQI
5th Oct 2025578 PMAQI
5th Oct 2025569 PMAQI
5th Oct 20256010 PMAQI
5th Oct 20256111 PMAQI
6th Oct 20256112 AMAQI
6th Oct 2025601 AMAQI
6th Oct 2025602 AMAQI
6th Oct 2025563 AMAQI
6th Oct 2025554 AMAQI
6th Oct 2025555 AMAQI

20°C12/27°C

6th Oct 2025566 AMAQI
6th Oct 2025607 AMAQI
6th Oct 2025578 AMAQI
6th Oct 2025589 AMAQI
6th Oct 20255910 AMAQI
6th Oct 20255611 AMAQI
6th Oct 20255712 PMAQI
6th Oct 2025561 PMAQI

21°C14/28°C

7th Oct 2025487 AMAQI
7th Oct 2025398 AMAQI
7th Oct 2025449 AMAQI
7th Oct 20254710 AMAQI
7th Oct 20255011 AMAQI
7th Oct 20254812 PMAQI
7th Oct 2025531 PMAQI
7th Oct 2025542 PMAQI
7th Oct 2025533 PMAQI
7th Oct 2025514 PMAQI
7th Oct 2025515 PMAQI
7th Oct 2025466 PMAQI
7th Oct 2025467 PMAQI
7th Oct 2025418 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 2025174 AMAQI
8th Oct 202585 AMAQI

21°C15/30°C

8th Oct 202576 AMAQI
8th Oct 202587 AMAQI
8th Oct 2025348 AMAQI
8th Oct 2025189 AMAQI
8th Oct 20253210 AMAQI
8th Oct 20254311 AMAQI
8th Oct 20251812 PMAQI
8th Oct 2025121 PMAQI
8th Oct 202592 PMAQI
8th Oct 202583 PMAQI
8th Oct 2025114 PMAQI
8th Oct 202595 PMAQI
8th Oct 2025106 PMAQI
8th Oct 202597 PMAQI
8th Oct 202568 PMAQI
8th Oct 2025309 PMAQI
8th Oct 20254410 PMAQI
8th Oct 20253811 PMAQI
9th Oct 20253612 AMAQI
9th Oct 2025361 AMAQI
9th Oct 2025152 AMAQI
9th Oct 202563 AMAQI
9th Oct 2025144 AMAQI
9th Oct 2025225 AMAQI

17°C10/21°C

9th Oct 2025226 AMAQI
9th Oct 2025217 AMAQI
9th Oct 2025238 AMAQI
9th Oct 2025149 AMAQI
9th Oct 2025910 AMAQI
9th Oct 2025811 AMAQI
9th Oct 2025812 PMAQI
9th Oct 2025131 PMAQI
9th Oct 2025332 PMAQI
9th Oct 2025403 PMAQI
9th Oct 2025384 PMAQI
9th Oct 2025265 PMAQI
9th Oct 2025176 PMAQI
9th Oct 2025107 PMAQI
9th Oct 2025348 PMAQI
9th Oct 2025399 PMAQI
9th Oct 20254210 PMAQI
9th Oct 20254111 PMAQI
10th Oct 20254012 AMAQI
10th Oct 2025371 AMAQI
10th Oct 2025302 AMAQI
10th Oct 2025133 AMAQI
10th Oct 202564 AMAQI
10th Oct 202565 AMAQI

9°C6/16°C

10th Oct 202576 AMAQI
10th Oct 202577 AMAQI
10th Oct 202578 AMAQI
10th Oct 2025109 AMAQI
10th Oct 20251710 AMAQI
10th Oct 20253611 AMAQI
10th Oct 20253812 PMAQI
10th Oct 2025411 PMAQI
10th Oct 2025222 PMAQI
10th Oct 2025133 PMAQI
10th Oct 2025124 PMAQI
10th Oct 2025115 PMAQI
10th Oct 2025176 PMAQI
10th Oct 2025127 PMAQI
10th Oct 2025118 PMAQI
10th Oct 2025319 PMAQI
10th Oct 20251710 PMAQI
10th Oct 20251011 PMAQI
11th Oct 20253512 AMAQI
11th Oct 2025411 AMAQI
11th Oct 2025392 AMAQI
11th Oct 2025363 AMAQI
11th Oct 2025164 AMAQI
11th Oct 202565 AMAQI

9°C1/17°C

11th Oct 202576 AMAQI
11th Oct 202577 AMAQI
11th Oct 2025288 AMAQI
11th Oct 2025169 AMAQI
11th Oct 2025710 AMAQI
11th Oct 20253211 AMAQI
11th Oct 20254112 PMAQI
11th Oct 2025231 PMAQI
11th Oct 2025112 PMAQI
11th Oct 2025193 PMAQI
11th Oct 2025364 PMAQI
11th Oct 2025525 PMAQI
11th Oct 2025526 PMAQI
11th Oct 2025417 PMAQI
11th Oct 2025448 PMAQI
11th Oct 2025469 PMAQI
11th Oct 20254510 PMAQI
11th Oct 20254911 PMAQI
12th Oct 20254612 AMAQI
12th Oct 2025431 AMAQI
12th Oct 2025432 AMAQI
12th Oct 2025433 AMAQI
12th Oct 2025164 AMAQI
12th Oct 202595 AMAQI

13°C8/20°C

12th Oct 202586 AMAQI
12th Oct 2025117 AMAQI
12th Oct 2025248 AMAQI
12th Oct 2025229 AMAQI
12th Oct 20252210 AMAQI
12th Oct 20251611 AMAQI
12th Oct 20251412 PMAQI
12th Oct 2025151 PMAQI
12th Oct 2025172 PMAQI
12th Oct 2025353 PMAQI
12th Oct 2025404 PMAQI
12th Oct 2025415 PMAQI
12th Oct 2025406 PMAQI
12th Oct 2025427 PMAQI
12th Oct 2025478 PMAQI
12th Oct 2025499 PMAQI
12th Oct 20255210 PMAQI
12th Oct 20255411 PMAQI
13th Oct 20255812 AMAQI
13th Oct 2025581 AMAQI
13th Oct 2025492 AMAQI
13th Oct 2025473 AMAQI
13th Oct 2025484 AMAQI
13th Oct 2025485 AMAQI

13°C10/15°C

13th Oct 2025476 AMAQI
13th Oct 2025517 AMAQI
13th Oct 2025538 AMAQI
13th Oct 2025549 AMAQI
13th Oct 20255410 AMAQI
13th Oct 20255411 AMAQI
13th Oct 20254912 PMAQI
13th Oct 2025451 PMAQI
13th Oct 2025402 PMAQI
13th Oct 2025443 PMAQI
13th Oct 2025444 PMAQI
13th Oct 2025405 PMAQI
13th Oct 2025286 PMAQI
13th Oct 2025277 PMAQI
13th Oct 2025188 PMAQI
13th Oct 2025279 PMAQI
13th Oct 20252710 PMAQI
13th Oct 20252511 PMAQI
14th Oct 20252612 AMAQI
14th Oct 2025251 AMAQI
14th Oct 2025272 AMAQI
14th Oct 2025263 AMAQI
14th Oct 2025254 AMAQI
14th Oct 2025275 AMAQI

13°C12/14°C

14th Oct 2025276 AMAQI
14th Oct 2025277 AMAQI
14th Oct 2025278 AMAQI
14th Oct 2025269 AMAQI
14th Oct 20251610 AMAQI
14th Oct 2025611 AMAQI
14th Oct 20251912 PMAQI
14th Oct 2025321 PMAQI
14th Oct 2025372 PMAQI
14th Oct 2025373 PMAQI
14th Oct 2025444 PMAQI
14th Oct 2025435 PMAQI
14th Oct 2025196 PMAQI
14th Oct 2025317 PMAQI
14th Oct 2025198 PMAQI
14th Oct 2025359 PMAQI
14th Oct 20253810 PMAQI
14th Oct 20254511 PMAQI
15th Oct 20254412 AMAQI
15th Oct 2025411 AMAQI
15th Oct 2025412 AMAQI
15th Oct 2025153 AMAQI
15th Oct 202584 AMAQI
15th Oct 2025105 AMAQI

13°C11/15°C

15th Oct 2025286 AMAQI
15th Oct 2025447 AMAQI
15th Oct 2025408 AMAQI
15th Oct 2025169 AMAQI
15th Oct 2025910 AMAQI
15th Oct 20251011 AMAQI
15th Oct 20253712 PMAQI
15th Oct 2025461 PMAQI
15th Oct 2025402 PMAQI
15th Oct 2025473 PMAQI
15th Oct 2025474 PMAQI
15th Oct 2025455 PMAQI
15th Oct 2025236 PMAQI
15th Oct 2025137 PMAQI
15th Oct 202578 PMAQI
15th Oct 202569 PMAQI
15th Oct 2025610 PMAQI
15th Oct 2025611 PMAQI
16th Oct 2025612 AMAQI
16th Oct 2025211 AMAQI
16th Oct 2025202 AMAQI
16th Oct 2025143 AMAQI
16th Oct 2025174 AMAQI
16th Oct 2025305 AMAQI

12°C6/17°C

16th Oct 2025176 AMAQI
16th Oct 202567 AMAQI
16th Oct 202588 AMAQI
16th Oct 2025159 AMAQI
16th Oct 2025810 AMAQI
16th Oct 20251011 AMAQI
16th Oct 20251712 PMAQI
16th Oct 2025211 PMAQI
16th Oct 2025132 PMAQI
16th Oct 2025183 PMAQI
16th Oct 2025144 PMAQI
16th Oct 2025185 PMAQI
16th Oct 2025186 PMAQI
16th Oct 2025217 PMAQI
16th Oct 2025138 PMAQI
16th Oct 2025189 PMAQI
16th Oct 20251610 PMAQI
16th Oct 20251611 PMAQI
17th Oct 2025812 AMAQI
17th Oct 2025251 AMAQI
17th Oct 2025252 AMAQI
17th Oct 202573 AMAQI
17th Oct 2025194 AMAQI
17th Oct 2025145 AMAQI

9°C5/14°C

17th Oct 202576 AMAQI
17th Oct 202577 AMAQI
17th Oct 2025108 AMAQI
17th Oct 2025119 AMAQI
17th Oct 20251510 AMAQI
17th Oct 20251311 AMAQI
17th Oct 20251612 PMAQI
17th Oct 2025291 PMAQI
17th Oct 2025362 PMAQI
17th Oct 2025213 PMAQI
17th Oct 2025174 PMAQI
17th Oct 2025185 PMAQI
17th Oct 2025196 PMAQI
17th Oct 2025417 PMAQI
17th Oct 2025478 PMAQI
17th Oct 2025499 PMAQI
17th Oct 20255210 PMAQI
17th Oct 20255411 PMAQI
18th Oct 20255712 AMAQI
18th Oct 2025581 AMAQI
18th Oct 2025552 AMAQI
18th Oct 2025453 AMAQI
18th Oct 2025414 AMAQI
18th Oct 2025485 AMAQI

11°C6/18°C

18th Oct 2025436 AMAQI
6 AM
18th Oct 2025277 AMAQI
18th Oct 2025238 AMAQI
18th Oct 2025329 AMAQI
18th Oct 20253310 AMAQI
18th Oct 20253911 AMAQI
18th Oct 20253812 PMAQI
12 PM
18th Oct 2025321 PMAQI
18th Oct 2025362 PMAQI
18th Oct 2025273 PMAQI
18th Oct 2025134 PMAQI
18th Oct 2025295 PMAQI
18th Oct 2025406 PMAQI
6 PM
18th Oct 2025407 PMAQI
12 AM
5 AM

--°C/°C

Day time
Avg. Highest Time
12 PM - 2 PM

29AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
6 AM

24AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 PM to 2 PM (Avg. 29), while the lowest AQI was between 6 AM to 6 AM (Avg. 24).
Night time
Avg. Highest Time
1 AM

32AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
4 AM - 5 AM

24AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 AM to 1 AM (Avg. 32), while the lowest AQI was between 4 AM to 5 AM (Avg. 24).

2025 Days Vs Air Quality

Boston, Massachusetts, United States

2025

87%

251

13%

39

Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)

Good
251 Days
Moderate
39 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



Under WHO’s Safe Air Quality Limits: 87%

Health Risk Level:

Low

In 2025, 87% of 291 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, 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
26AQI
2nd January 2025
21AQI
3rd January 2025
21AQI
4th January 2025
25AQI
5th January 2025
24AQI
6th January 2025
20AQI
7th January 2025
20AQI
8th January 2025
21AQI
9th January 2025
23AQI
10th January 2025
23AQI
11th January 2025
31AQI
12th January 2025
34AQI
13th January 2025
53AQI
14th January 2025
27AQI
15th January 2025
24AQI
16th January 2025
33AQI
17th January 2025
58AQI
18th January 2025
47AQI
19th January 2025
29AQI
20th January 2025
29AQI
21st January 2025
47AQI
22nd January 2025
54AQI
23rd January 2025
53AQI
24th January 2025
55AQI
25th January 2025
43AQI
26th January 2025
46AQI
27th January 2025
28AQI
28th January 2025
28AQI
29th January 2025
30AQI
30th January 2025
31AQI
31st January 2025
37AQI
1st February 2025
27AQI
2nd February 2025
26AQI
3rd February 2025
44AQI
4th February 2025
27AQI
5th February 2025
23AQI
6th February 2025
37AQI
7th February 2025
32AQI
8th February 2025
31AQI
9th February 2025
31AQI
10th February 2025
31AQI
11th February 2025
45AQI
12th February 2025
37AQI
13th February 2025
25AQI
14th February 2025
29AQI
15th February 2025
27AQI
16th February 2025
26AQI
17th February 2025
29AQI
18th February 2025
27AQI
19th February 2025
23AQI
20th February 2025
25AQI
21st February 2025
24AQI
22nd February 2025
29AQI
23rd February 2025
41AQI
24th February 2025
47AQI
25th February 2025
44AQI
26th February 2025
28AQI
27th February 2025
38AQI
28th February 2025
26AQI
1st March 2025
29AQI
2nd March 2025
28AQI
3rd March 2025
26AQI
4th March 2025
37AQI
5th March 2025
31AQI
6th March 2025
26AQI
7th March 2025
29AQI
8th March 2025
30AQI
9th March 2025
29AQI
10th March 2025
27AQI
11th March 2025
36AQI
12th March 2025
28AQI
13th March 2025
22AQI
14th March 2025
29AQI
15th March 2025
26AQI
16th March 2025
34AQI
17th March 2025
19AQI
18th March 2025
17AQI
19th March 2025
21AQI
20th March 2025
18AQI
21st March 2025
25AQI
22nd March 2025
19AQI
23rd March 2025
16AQI
24th March 2025
25AQI
25th March 2025
28AQI
26th March 2025
24AQI
27th March 2025
18AQI
28th March 2025
20AQI
29th March 2025
21AQI
30th March 2025
23AQI
31st March 2025
36AQI
1st April 2025
19AQI
2nd April 2025
18AQI
3rd April 2025
26AQI
4th April 2025
26AQI
5th April 2025
22AQI
6th April 2025
21AQI
7th April 2025
17AQI
8th April 2025
17AQI
9th April 2025
15AQI
10th April 2025
21AQI
11th April 2025
21AQI
12th April 2025
18AQI
13th April 2025
16AQI
14th April 2025
20AQI
15th April 2025
32AQI
16th April 2025
12AQI
17th April 2025
15AQI
18th April 2025
20AQI
19th April 2025
49AQI
20th April 2025
21AQI
21st April 2025
16AQI
22nd April 2025
43AQI
23rd April 2025
26AQI
24th April 2025
22AQI
25th April 2025
55AQI
26th April 2025
32AQI
27th April 2025
12AQI
28th April 2025
19AQI
29th April 2025
27AQI
30th April 2025
24AQI
1st May 2025
18AQI
2nd May 2025
40AQI
3rd May 2025
47AQI
4th May 2025
39AQI
5th May 2025
27AQI
6th May 2025
34AQI
7th May 2025
29AQI
8th May 2025
26AQI
9th May 2025
35AQI
10th May 2025
15AQI
11th May 2025
21AQI
12th May 2025
22AQI
13th May 2025
30AQI
14th May 2025
31AQI
15th May 2025
42AQI
16th May 2025
37AQI
17th May 2025
37AQI
18th May 2025
19AQI
19th May 2025
13AQI
20th May 2025
13AQI
21st May 2025
18AQI
22nd May 2025
22AQI
23rd May 2025
15AQI
24th May 2025
14AQI
25th May 2025
13AQI
26th May 2025
20AQI
27th May 2025
26AQI
28th May 2025
28AQI
29th May 2025
22AQI
30th May 2025
33AQI
31st May 2025
20AQI
1st June 2025
13AQI
2nd June 2025
18AQI
3rd June 2025
24AQI
4th June 2025
39AQI
5th June 2025
58AQI
6th June 2025
62AQI
7th June 2025
55AQI
8th June 2025
89AQI
9th June 2025
83AQI
10th June 2025
58AQI
11th June 2025
52AQI
12th June 2025
70AQI
13th June 2025
54AQI
14th June 2025
46AQI
15th June 2025
31AQI
16th June 2025
34AQI
17th June 2025
30AQI
18th June 2025
24AQI
19th June 2025
27AQI
20th June 2025
34AQI
21st June 2025
52AQI
22nd June 2025
53AQI
23rd June 2025
51AQI
24th June 2025
55AQI
25th June 2025
53AQI
26th June 2025
39AQI
27th June 2025
26AQI
28th June 2025
28AQI
29th June 2025
42AQI
30th June 2025
39AQI
1st July 2025
39AQI
2nd July 2025
33AQI
3rd July 2025
45AQI
4th July 2025
43AQI
5th July 2025
51AQI
6th July 2025
58AQI
7th July 2025
44AQI
8th July 2025
36AQI
9th July 2025
33AQI
10th July 2025
30AQI
11th July 2025
33AQI
12th July 2025
33AQI
13th July 2025
23AQI
14th July 2025
24AQI
15th July 2025
28AQI
16th July 2025
35AQI
17th July 2025
37AQI
18th July 2025
20AQI
19th July 2025
26AQI
20th July 2025
20AQI
21st July 2025
30AQI
22nd July 2025
18AQI
23rd July 2025
23AQI
24th July 2025
28AQI
25th July 2025
37AQI
26th July 2025
76AQI
27th July 2025
80AQI
28th July 2025
71AQI
29th July 2025
60AQI
30th July 2025
54AQI
31st July 2025
68AQI
1st August 2025
59AQI
2nd August 2025
32AQI
3rd August 2025
55AQI
4th August 2025
75AQI
5th August 2025
80AQI
6th August 2025
51AQI
7th August 2025
64AQI
8th August 2025
35AQI
9th August 2025
33AQI
10th August 2025
36AQI
11th August 2025
52AQI
12th August 2025
63AQI
13th August 2025
51AQI
14th August 2025
36AQI
15th August 2025
44AQI
16th August 2025
34AQI
17th August 2025
49AQI
18th August 2025
19AQI
19th August 2025
19AQI
20th August 2025
18AQI
21st August 2025
20AQI
22nd August 2025
26AQI
23rd August 2025
39AQI
24th August 2025
28AQI
25th August 2025
31AQI
26th August 2025
20AQI
27th August 2025
20AQI
28th August 2025
21AQI
29th August 2025
24AQI
30th August 2025
19AQI
31st August 2025
21AQI
1st September 2025
32AQI
2nd September 2025
30AQI
3rd September 2025
31AQI
4th September 2025
27AQI
5th September 2025
34AQI
6th September 2025
46AQI
7th September 2025
35AQI
8th September 2025
24AQI
9th September 2025
26AQI
10th September 2025
24AQI
11th September 2025
30AQI
12th September 2025
32AQI
13th September 2025
33AQI
14th September 2025
39AQI
15th September 2025
48AQI
16th September 2025
33AQI
17th September 2025
26AQI
18th September 2025
21AQI
19th September 2025
27AQI
20th September 2025
19AQI
21st September 2025
24AQI
22nd September 2025
23AQI
23rd September 2025
28AQI
24th September 2025
31AQI
25th September 2025
18AQI
26th September 2025
23AQI
27th September 2025
22AQI
28th September 2025
28AQI
29th September 2025
21AQI
30th September 2025
20AQI
1st October 2025
35AQI
2nd October 2025
20AQI
3rd October 2025
27AQI
4th October 2025
44AQI
5th October 2025
56AQI
6th October 2025
58AQI
7th October 2025
41AQI
8th October 2025
18AQI
9th October 2025
24AQI
10th October 2025
19AQI
11th October 2025
32AQI
12th October 2025
33AQI
13th October 2025
41AQI
14th October 2025
28AQI
15th October 2025
24AQI
16th October 2025
16AQI
17th October 2025
25AQI
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
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

34AQI

31AQI

26AQI

23AQI

26AQI

45AQI

40AQI

38AQI

29AQI

32AQI


No. of days

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

202532AQI

26
5
28
31
29
1
31
16
14
23
8
22
9
30
15
2
251
39

Highest AQI recorded in

June

45AQI


Lowest AQI recorded in

April

23AQI


202429AQI

28
3
29
31
30
31
30
28
3
24
7
30
31
30
29
2
351
15

Highest AQI recorded in

August

38AQI


Lowest AQI recorded in

November

24AQI


202334AQI

31
27
1
31
27
3
31
20
10
21
9
1
26
5
23
7
29
2
28
1
30
1
324
39
1

Highest AQI recorded in

July

46AQI


Lowest AQI recorded in

November

27AQI


202232AQI

23
8
20
1
27
4
17
30
1
29
1
21
2
2
30
31
29
1
28
3
287
21

Highest AQI recorded in

January

39AQI


Lowest AQI recorded in

August

24AQI


202132AQI

27
3
25
3
31
30
31
26
3
26
5
26
5
30
31
27
3
28
3
338
25

Highest AQI recorded in

July

36AQI


Lowest AQI recorded in

October

24AQI


202033AQI

5
1
19
18
29
1
30
1
30
1
27
3
31
26
4
26
5
241
16

Highest AQI recorded in

August

39AQI


Lowest AQI recorded in

April

29AQI


Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2023(Avg.)
34AQI
Least Polluted Year Recorded
2024(Avg.)
29AQI


Boston's annual 2025 AQI (32) shows an average percentage change of 0.9% (worsened AQI) compared to previous years: 2020 (33), 2021 (32), 2022 (32), 2023 (34), 2024 (29).