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
2022
2023
2024
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
5th Aug 2025
82AQILowest AQI recorded on
20th Aug 2024
15AQISame Day Analysis (15th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 21 of Good air quality, showing improvement over 2025, 2024 and 2023 on the same day.
Day & Night AQI Trend: 15th Aug - 16th Aug 2026
Boston, Chelsea, Massachusetts, United States
AQI
Day
Night
.
5 AM15th Aug 2026
8 PM
4 AM16th Aug 2026
Day time
Avg. Highest Time
8AM15th Aug
36AQI
Avg. Lowest Time
6PM15th Aug
11AQI
Night time
Avg. Highest Time
11PM15th Aug
40AQI
Avg. Lowest Time
9PM15th Aug
12AQI
In the last 24 hours,
Boston's AQI reached its highest point of 40 at 11 PM during the Night, while the lowest point, 11, was recorded at 6 PM during the Day between 15th Aug and 16th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Boston, Chelsea, Massachusetts, United States
JulAug
18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th
Day
Night
18th Jul 2026385 AMAQI
18th Jul 2026476 AMAQI
18th Jul 2026497 AMAQI
18th Jul 2026478 AMAQI
18th Jul 2026629 AMAQI
18th Jul 20267410 AMAQI
18th Jul 20269211 AMAQI
18th Jul 20269712 PMAQI
18th Jul 20261091 PMAQI
18th Jul 20261452 PMAQI
18th Jul 20261313 PMAQI
18th Jul 20261484 PMAQI
18th Jul 20261385 PMAQI
18th Jul 20261536 PMAQI
18th Jul 20261527 PMAQI
18th Jul 20261548 PMAQI
18th Jul 20261589 PMAQI
18th Jul 202615610 PMAQI
18th Jul 202614911 PMAQI
19th Jul 202614212 AMAQI
19th Jul 20261081 AMAQI
19th Jul 2026872 AMAQI
19th Jul 2026633 AMAQI
19th Jul 2026604 AMAQI
23°C16/32°C
19th Jul 2026365 AMAQI
19th Jul 2026446 AMAQI
19th Jul 2026467 AMAQI
19th Jul 2026488 AMAQI
19th Jul 2026409 AMAQI
19th Jul 20264210 AMAQI
19th Jul 20262111 AMAQI
19th Jul 20262512 PMAQI
19th Jul 2026271 PMAQI
19th Jul 2026232 PMAQI
19th Jul 2026333 PMAQI
19th Jul 2026194 PMAQI
19th Jul 2026375 PMAQI
19th Jul 2026126 PMAQI
19th Jul 2026347 PMAQI
19th Jul 2026128 PMAQI
19th Jul 2026369 PMAQI
19th Jul 20264010 PMAQI
19th Jul 20264611 PMAQI
20th Jul 20264212 AMAQI
20th Jul 2026501 AMAQI
20th Jul 2026582 AMAQI
20th Jul 2026503 AMAQI
20th Jul 2026244 AMAQI
23°C20/26°C
20th Jul 2026205 AMAQI
20th Jul 2026266 AMAQI
20th Jul 2026207 AMAQI
20th Jul 202688 AMAQI
20th Jul 2026299 AMAQI
20th Jul 20261610 AMAQI
20th Jul 20262511 AMAQI
20th Jul 20261512 PMAQI
20th Jul 2026201 PMAQI
20th Jul 2026162 PMAQI
20th Jul 2026173 PMAQI
20th Jul 2026364 PMAQI
20th Jul 2026205 PMAQI
20th Jul 2026506 PMAQI
20th Jul 2026827 PMAQI
20th Jul 2026568 PMAQI
20th Jul 2026309 PMAQI
20th Jul 20262410 PMAQI
21st Jul 20264412 AMAQI
21st Jul 2026311 AMAQI
21st Jul 2026422 AMAQI
21st Jul 2026273 AMAQI
21st Jul 2026524 AMAQI
23°C14/31°C
21st Jul 2026565 AMAQI
21st Jul 2026366 AMAQI
21st Jul 2026467 AMAQI
21st Jul 2026278 AMAQI
21st Jul 2026389 AMAQI
21st Jul 20264610 AMAQI
21st Jul 20264611 AMAQI
21st Jul 20264412 PMAQI
21st Jul 2026481 PMAQI
21st Jul 2026442 PMAQI
21st Jul 2026423 PMAQI
21st Jul 2026404 PMAQI
21st Jul 2026405 PMAQI
21st Jul 2026466 PMAQI
21st Jul 2026447 PMAQI
21st Jul 2026508 PMAQI
21st Jul 2026429 PMAQI
21st Jul 20263810 PMAQI
21st Jul 20262511 PMAQI
22nd Jul 20263312 AMAQI
22nd Jul 2026331 AMAQI
22nd Jul 2026272 AMAQI
22nd Jul 2026293 AMAQI
22nd Jul 2026424 AMAQI
22°C16/31°C
22nd Jul 2026385 AMAQI
22nd Jul 2026406 AMAQI
22nd Jul 2026297 AMAQI
22nd Jul 2026278 AMAQI
22nd Jul 2026259 AMAQI
22nd Jul 20262310 AMAQI
22nd Jul 20262511 AMAQI
22nd Jul 20262312 PMAQI
22nd Jul 2026251 PMAQI
22nd Jul 2026252 PMAQI
22nd Jul 2026253 PMAQI
22nd Jul 2026254 PMAQI
22nd Jul 2026275 PMAQI
22nd Jul 2026236 PMAQI
22nd Jul 2026237 PMAQI
22nd Jul 2026238 PMAQI
22nd Jul 2026219 PMAQI
22nd Jul 20262110 PMAQI
22nd Jul 20262111 PMAQI
23rd Jul 20262312 AMAQI
23rd Jul 2026171 AMAQI
23rd Jul 2026212 AMAQI
23rd Jul 2026253 AMAQI
23rd Jul 2026184 AMAQI
24°C20/31°C
23rd Jul 2026215 AMAQI
23rd Jul 2026206 AMAQI
23rd Jul 2026147 AMAQI
23rd Jul 202688 AMAQI
23rd Jul 202689 AMAQI
23rd Jul 20261810 AMAQI
23rd Jul 2026811 AMAQI
23rd Jul 20262812 PMAQI
23rd Jul 202691 PMAQI
23rd Jul 2026162 PMAQI
23rd Jul 2026123 PMAQI
23rd Jul 2026124 PMAQI
23rd Jul 2026385 PMAQI
23rd Jul 2026126 PMAQI
23rd Jul 2026227 PMAQI
23rd Jul 2026318 PMAQI
23rd Jul 2026219 PMAQI
23rd Jul 20262310 PMAQI
23rd Jul 20262111 PMAQI
24th Jul 20262912 AMAQI
24th Jul 2026291 AMAQI
24th Jul 2026252 AMAQI
24th Jul 2026333 AMAQI
24th Jul 2026254 AMAQI
20°C15/25°C
24th Jul 2026365 AMAQI
24th Jul 2026366 AMAQI
24th Jul 2026327 AMAQI
24th Jul 2026218 AMAQI
24th Jul 2026219 AMAQI
24th Jul 20262510 AMAQI
24th Jul 20262111 AMAQI
24th Jul 20262112 PMAQI
24th Jul 2026211 PMAQI
24th Jul 2026292 PMAQI
24th Jul 2026233 PMAQI
24th Jul 2026254 PMAQI
24th Jul 2026165 PMAQI
24th Jul 2026256 PMAQI
24th Jul 2026217 PMAQI
24th Jul 2026218 PMAQI
24th Jul 2026259 PMAQI
24th Jul 20262510 PMAQI
24th Jul 20262111 PMAQI
25th Jul 20263612 AMAQI
25th Jul 2026331 AMAQI
25th Jul 2026322 AMAQI
25th Jul 2026213 AMAQI
25th Jul 2026204 AMAQI
22°C14/31°C
25th Jul 2026325 AMAQI
25th Jul 2026366 AMAQI
25th Jul 2026327 AMAQI
25th Jul 2026348 AMAQI
25th Jul 2026279 AMAQI
25th Jul 20262710 AMAQI
25th Jul 20262511 AMAQI
25th Jul 20262912 PMAQI
25th Jul 2026271 PMAQI
25th Jul 2026422 PMAQI
25th Jul 2026363 PMAQI
25th Jul 2026404 PMAQI
25th Jul 2026215 PMAQI
25th Jul 2026386 PMAQI
25th Jul 2026387 PMAQI
25th Jul 2026188 PMAQI
25th Jul 2026169 PMAQI
25th Jul 20262910 PMAQI
25th Jul 20262711 PMAQI
26th Jul 20262112 AMAQI
26th Jul 2026361 AMAQI
26th Jul 2026342 AMAQI
26th Jul 2026313 AMAQI
26th Jul 2026384 AMAQI
21°C15/28°C
26th Jul 2026215 AMAQI
26th Jul 2026426 AMAQI
26th Jul 2026347 AMAQI
26th Jul 2026318 AMAQI
26th Jul 2026329 AMAQI
26th Jul 20263410 AMAQI
26th Jul 20264211 AMAQI
26th Jul 20263812 PMAQI
26th Jul 2026291 PMAQI
26th Jul 2026232 PMAQI
26th Jul 2026293 PMAQI
26th Jul 2026294 PMAQI
26th Jul 2026335 PMAQI
26th Jul 2026336 PMAQI
26th Jul 2026257 PMAQI
26th Jul 2026278 PMAQI
26th Jul 2026299 PMAQI
26th Jul 20262110 PMAQI
26th Jul 20263611 PMAQI
27th Jul 20262512 AMAQI
27th Jul 2026251 AMAQI
27th Jul 2026252 AMAQI
27th Jul 2026293 AMAQI
27th Jul 2026364 AMAQI
18°C12/24°C
27th Jul 2026325 AMAQI
27th Jul 2026276 AMAQI
27th Jul 2026367 AMAQI
27th Jul 2026238 AMAQI
27th Jul 2026349 AMAQI
27th Jul 20263610 AMAQI
27th Jul 20263611 AMAQI
27th Jul 20263412 PMAQI
27th Jul 2026421 PMAQI
27th Jul 2026362 PMAQI
27th Jul 2026363 PMAQI
27th Jul 2026384 PMAQI
27th Jul 2026255 PMAQI
27th Jul 2026386 PMAQI
27th Jul 2026317 PMAQI
27th Jul 2026328 PMAQI
27th Jul 2026239 PMAQI
27th Jul 20263210 PMAQI
27th Jul 20263211 PMAQI
28th Jul 20263212 AMAQI
28th Jul 2026421 AMAQI
28th Jul 2026382 AMAQI
28th Jul 2026213 AMAQI
28th Jul 2026324 AMAQI
21°C12/29°C
28th Jul 2026385 AMAQI
28th Jul 2026366 AMAQI
28th Jul 2026307 AMAQI
28th Jul 2026308 AMAQI
28th Jul 2026219 AMAQI
28th Jul 20264010 AMAQI
28th Jul 20264011 AMAQI
28th Jul 20264612 PMAQI
28th Jul 2026401 PMAQI
28th Jul 2026462 PMAQI
28th Jul 2026423 PMAQI
28th Jul 2026464 PMAQI
28th Jul 2026425 PMAQI
28th Jul 2026426 PMAQI
28th Jul 2026407 PMAQI
28th Jul 2026368 PMAQI
28th Jul 2026309 PMAQI
28th Jul 20263210 PMAQI
28th Jul 20263411 PMAQI
29th Jul 20263812 AMAQI
29th Jul 2026361 AMAQI
29th Jul 2026342 AMAQI
29th Jul 2026323 AMAQI
29th Jul 2026184 AMAQI
23°C18/29°C
29th Jul 2026175 AMAQI
29th Jul 2026306 AMAQI
29th Jul 2026197 AMAQI
29th Jul 2026208 AMAQI
29th Jul 2026329 AMAQI
29th Jul 20263410 AMAQI
29th Jul 20262211 AMAQI
29th Jul 20262412 PMAQI
29th Jul 2026231 PMAQI
29th Jul 2026212 PMAQI
29th Jul 2026203 PMAQI
29th Jul 2026224 PMAQI
29th Jul 2026505 PMAQI
29th Jul 2026226 PMAQI
29th Jul 2026317 PMAQI
29th Jul 2026368 PMAQI
29th Jul 2026469 PMAQI
29th Jul 20264810 PMAQI
29th Jul 20263611 PMAQI
30th Jul 20264612 AMAQI
30th Jul 2026211 AMAQI
30th Jul 2026322 AMAQI
30th Jul 2026233 AMAQI
30th Jul 2026274 AMAQI
21°C19/25°C
30th Jul 2026335 AMAQI
30th Jul 2026286 AMAQI
30th Jul 2026297 AMAQI
30th Jul 2026228 AMAQI
30th Jul 2026149 AMAQI
30th Jul 20262910 AMAQI
30th Jul 20262111 AMAQI
30th Jul 20261512 PMAQI
30th Jul 2026161 PMAQI
30th Jul 2026142 PMAQI
30th Jul 2026143 PMAQI
30th Jul 2026214 PMAQI
30th Jul 2026125 PMAQI
30th Jul 2026166 PMAQI
30th Jul 2026167 PMAQI
30th Jul 2026408 PMAQI
30th Jul 2026219 PMAQI
30th Jul 20261210 PMAQI
30th Jul 20262111 PMAQI
31st Jul 20262112 AMAQI
31st Jul 2026201 AMAQI
31st Jul 2026252 AMAQI
31st Jul 2026213 AMAQI
31st Jul 2026384 AMAQI
19°C18/21°C
31st Jul 2026255 AMAQI
31st Jul 2026256 AMAQI
31st Jul 2026217 AMAQI
31st Jul 2026258 AMAQI
31st Jul 2026239 AMAQI
31st Jul 20262310 AMAQI
31st Jul 20262311 AMAQI
31st Jul 20263212 PMAQI
31st Jul 2026231 PMAQI
31st Jul 2026252 PMAQI
31st Jul 2026293 PMAQI
31st Jul 2026274 PMAQI
31st Jul 2026255 PMAQI
31st Jul 2026346 PMAQI
31st Jul 2026217 PMAQI
31st Jul 2026278 PMAQI
31st Jul 2026299 PMAQI
31st Jul 20262510 PMAQI
31st Jul 20264011 PMAQI
1st Aug 20264712 AMAQI
1st Aug 2026421 AMAQI
1st Aug 2026322 AMAQI
1st Aug 2026343 AMAQI
1st Aug 2026234 AMAQI
22°C17/28°C
1st Aug 2026255 AMAQI
1st Aug 2026346 AMAQI
1st Aug 2026347 AMAQI
1st Aug 2026328 AMAQI
1st Aug 2026329 AMAQI
1st Aug 20263010 AMAQI
1st Aug 20263411 AMAQI
1st Aug 20263612 PMAQI
1st Aug 2026361 PMAQI
1st Aug 2026322 PMAQI
1st Aug 2026363 PMAQI
1st Aug 2026424 PMAQI
1st Aug 2026425 PMAQI
1st Aug 2026446 PMAQI
1st Aug 2026407 PMAQI
1st Aug 2026368 PMAQI
1st Aug 2026259 PMAQI
1st Aug 20263410 PMAQI
1st Aug 20263611 PMAQI
2nd Aug 20262312 AMAQI
2nd Aug 2026361 AMAQI
2nd Aug 2026342 AMAQI
2nd Aug 2026363 AMAQI
2nd Aug 2026304 AMAQI
25°C18/33°C
2nd Aug 2026345 AMAQI
2nd Aug 2026326 AMAQI
2nd Aug 2026347 AMAQI
2nd Aug 2026388 AMAQI
2nd Aug 2026429 AMAQI
2nd Aug 20264410 AMAQI
2nd Aug 20262311 AMAQI
2nd Aug 20264012 PMAQI
2nd Aug 2026401 PMAQI
2nd Aug 2026422 PMAQI
2nd Aug 2026463 PMAQI
2nd Aug 2026324 PMAQI
2nd Aug 2026325 PMAQI
2nd Aug 2026326 PMAQI
2nd Aug 2026337 PMAQI
2nd Aug 2026328 PMAQI
2nd Aug 2026239 PMAQI
2nd Aug 20262210 PMAQI
2nd Aug 20262111 PMAQI
3rd Aug 20262512 AMAQI
3rd Aug 2026291 AMAQI
3rd Aug 2026382 AMAQI
3rd Aug 2026273 AMAQI
3rd Aug 2026364 AMAQI
26°C21/33°C
3rd Aug 2026345 AMAQI
3rd Aug 2026386 AMAQI
3rd Aug 2026427 AMAQI
3rd Aug 2026448 AMAQI
3rd Aug 2026469 AMAQI
3rd Aug 20264210 AMAQI
3rd Aug 20264211 AMAQI
3rd Aug 20264012 PMAQI
3rd Aug 2026381 PMAQI
3rd Aug 2026382 PMAQI
3rd Aug 2026363 PMAQI
3rd Aug 2026444 PMAQI
3rd Aug 2026215 PMAQI
3rd Aug 2026226 PMAQI
3rd Aug 2026207 PMAQI
3rd Aug 2026168 PMAQI
3rd Aug 2026259 PMAQI
3rd Aug 20262610 PMAQI
3rd Aug 20261811 PMAQI
4th Aug 20261812 AMAQI
4th Aug 2026161 AMAQI
4th Aug 2026202 AMAQI
4th Aug 2026203 AMAQI
4th Aug 2026184 AMAQI
24°C20/26°C
4th Aug 2026195 AMAQI
4th Aug 2026166 AMAQI
4th Aug 2026177 AMAQI
4th Aug 2026178 AMAQI
4th Aug 2026109 AMAQI
4th Aug 20261010 AMAQI
4th Aug 20261111 AMAQI
4th Aug 20261112 PMAQI
4th Aug 2026211 PMAQI
4th Aug 2026132 PMAQI
4th Aug 2026383 PMAQI
4th Aug 2026314 PMAQI
4th Aug 2026125 PMAQI
4th Aug 2026126 PMAQI
4th Aug 2026167 PMAQI
4th Aug 2026138 PMAQI
4th Aug 2026109 PMAQI
4th Aug 20261310 PMAQI
4th Aug 20261011 PMAQI
5th Aug 20261912 AMAQI
5th Aug 2026251 AMAQI
5th Aug 202682 AMAQI
5th Aug 202693 AMAQI
5th Aug 2026214 AMAQI
24°C17/34°C
5th Aug 2026165 AMAQI
5th Aug 202696 AMAQI
5th Aug 2026147 AMAQI
5th Aug 2026258 AMAQI
5th Aug 2026129 AMAQI
5th Aug 20263810 AMAQI
5th Aug 20263311 AMAQI
5th Aug 20265412 PMAQI
5th Aug 2026251 PMAQI
5th Aug 2026542 PMAQI
5th Aug 2026563 PMAQI
5th Aug 2026254 PMAQI
5th Aug 2026255 PMAQI
5th Aug 2026386 PMAQI
5th Aug 2026257 PMAQI
5th Aug 2026498 PMAQI
5th Aug 2026499 PMAQI
5th Aug 20263610 PMAQI
5th Aug 20264911 PMAQI
6th Aug 20264012 AMAQI
6th Aug 2026421 AMAQI
6th Aug 2026382 AMAQI
6th Aug 2026293 AMAQI
6th Aug 2026444 AMAQI
25°C18/34°C
6th Aug 2026425 AMAQI
6th Aug 2026366 AMAQI
6th Aug 2026277 AMAQI
6th Aug 2026428 AMAQI
6th Aug 2026329 AMAQI
6th Aug 20264810 AMAQI
6th Aug 20264011 AMAQI
6th Aug 20262712 PMAQI
6th Aug 2026421 PMAQI
6th Aug 2026402 PMAQI
6th Aug 2026383 PMAQI
6th Aug 2026384 PMAQI
6th Aug 2026365 PMAQI
6th Aug 2026326 PMAQI
6th Aug 2026257 PMAQI
6th Aug 2026428 PMAQI
6th Aug 2026469 PMAQI
6th Aug 20264810 PMAQI
6th Aug 20264011 PMAQI
7th Aug 20264212 AMAQI
7th Aug 2026421 AMAQI
7th Aug 2026422 AMAQI
7th Aug 2026493 AMAQI
7th Aug 2026514 AMAQI
27°C22/33°C
7th Aug 2026585 AMAQI
7th Aug 2026556 AMAQI
7th Aug 2026517 AMAQI
7th Aug 2026548 AMAQI
7th Aug 2026539 AMAQI
7th Aug 20265510 AMAQI
7th Aug 20264811 AMAQI
7th Aug 20264212 PMAQI
7th Aug 2026381 PMAQI
7th Aug 2026362 PMAQI
7th Aug 2026363 PMAQI
7th Aug 2026234 PMAQI
7th Aug 2026215 PMAQI
7th Aug 2026256 PMAQI
7th Aug 2026237 PMAQI
7th Aug 2026258 PMAQI
7th Aug 2026369 PMAQI
7th Aug 20264010 PMAQI
7th Aug 20262511 PMAQI
8th Aug 20262312 AMAQI
8th Aug 2026231 AMAQI
8th Aug 2026212 AMAQI
8th Aug 2026233 AMAQI
8th Aug 2026364 AMAQI
30°C24/38°C
8th Aug 2026235 AMAQI
8th Aug 2026386 AMAQI
8th Aug 2026367 AMAQI
8th Aug 2026428 AMAQI
8th Aug 2026469 AMAQI
8th Aug 20262410 AMAQI
8th Aug 20264611 AMAQI
8th Aug 20263312 PMAQI
8th Aug 2026211 PMAQI
8th Aug 2026212 PMAQI
8th Aug 2026253 PMAQI
8th Aug 2026214 PMAQI
8th Aug 2026215 PMAQI
8th Aug 2026216 PMAQI
8th Aug 2026217 PMAQI
8th Aug 2026258 PMAQI
8th Aug 2026219 PMAQI
8th Aug 20262310 PMAQI
8th Aug 20262511 PMAQI
9th Aug 20262512 AMAQI
9th Aug 2026251 AMAQI
9th Aug 2026252 AMAQI
9th Aug 2026213 AMAQI
9th Aug 2026384 AMAQI
28°C22/33°C
9th Aug 2026255 AMAQI
9th Aug 2026256 AMAQI
9th Aug 2026257 AMAQI
9th Aug 2026448 AMAQI
9th Aug 2026369 AMAQI
9th Aug 20262710 AMAQI
9th Aug 20262111 AMAQI
9th Aug 20262912 PMAQI
9th Aug 2026381 PMAQI
9th Aug 2026422 PMAQI
9th Aug 2026403 PMAQI
9th Aug 2026424 PMAQI
9th Aug 2026405 PMAQI
9th Aug 2026446 PMAQI
9th Aug 2026387 PMAQI
9th Aug 2026408 PMAQI
9th Aug 2026449 PMAQI
9th Aug 20264010 PMAQI
9th Aug 20262511 PMAQI
10th Aug 20262512 AMAQI
10th Aug 2026251 AMAQI
10th Aug 2026232 AMAQI
10th Aug 2026213 AMAQI
10th Aug 2026304 AMAQI
27°C21/35°C
10th Aug 2026215 AMAQI
10th Aug 2026216 AMAQI
10th Aug 2026217 AMAQI
10th Aug 2026218 AMAQI
10th Aug 2026219 AMAQI
10th Aug 20263610 AMAQI
10th Aug 20262311 AMAQI
10th Aug 20262112 PMAQI
10th Aug 2026211 PMAQI
10th Aug 2026402 PMAQI
10th Aug 2026403 PMAQI
10th Aug 2026444 PMAQI
10th Aug 2026385 PMAQI
10th Aug 2026366 PMAQI
10th Aug 2026217 PMAQI
10th Aug 2026218 PMAQI
10th Aug 2026219 PMAQI
10th Aug 20262310 PMAQI
10th Aug 20262111 PMAQI
11th Aug 20262112 AMAQI
11th Aug 2026211 AMAQI
11th Aug 2026252 AMAQI
11th Aug 2026213 AMAQI
11th Aug 2026214 AMAQI
26°C19/34°C
11th Aug 2026215 AMAQI
11th Aug 2026256 AMAQI
11th Aug 2026257 AMAQI
11th Aug 2026258 AMAQI
11th Aug 2026319 AMAQI
11th Aug 20263810 AMAQI
11th Aug 20264211 AMAQI
11th Aug 20263812 PMAQI
11th Aug 2026401 PMAQI
11th Aug 2026422 PMAQI
11th Aug 2026423 PMAQI
11th Aug 2026404 PMAQI
11th Aug 2026405 PMAQI
11th Aug 2026386 PMAQI
11th Aug 2026367 PMAQI
11th Aug 2026368 PMAQI
11th Aug 2026369 PMAQI
11th Aug 20262910 PMAQI
11th Aug 20262911 PMAQI
12th Aug 20262912 AMAQI
12th Aug 2026311 AMAQI
12th Aug 2026312 AMAQI
12th Aug 2026313 AMAQI
12th Aug 2026364 AMAQI
26°C21/34°C
12th Aug 2026335 AMAQI
12th Aug 2026316 AMAQI
12th Aug 2026257 AMAQI
12th Aug 2026238 AMAQI
12th Aug 2026299 AMAQI
12th Aug 20263410 AMAQI
12th Aug 20262511 AMAQI
12th Aug 20262112 PMAQI
12th Aug 2026251 PMAQI
12th Aug 2026212 PMAQI
12th Aug 2026213 PMAQI
12th Aug 2026214 PMAQI
12th Aug 2026215 PMAQI
12th Aug 2026256 PMAQI
12th Aug 2026237 PMAQI
12th Aug 2026218 PMAQI
12th Aug 2026259 PMAQI
12th Aug 20262110 PMAQI
12th Aug 20262511 PMAQI
13th Aug 20262512 AMAQI
13th Aug 2026331 AMAQI
13th Aug 2026212 AMAQI
13th Aug 2026253 AMAQI
13th Aug 2026254 AMAQI
24°C18/30°C
13th Aug 2026255 AMAQI
13th Aug 2026216 AMAQI
13th Aug 2026217 AMAQI
13th Aug 2026218 AMAQI
13th Aug 2026239 AMAQI
13th Aug 20262510 AMAQI
13th Aug 20262311 AMAQI
13th Aug 20262112 PMAQI
13th Aug 2026291 PMAQI
13th Aug 2026402 PMAQI
13th Aug 2026423 PMAQI
13th Aug 2026384 PMAQI
13th Aug 2026335 PMAQI
13th Aug 2026386 PMAQI
13th Aug 2026367 PMAQI
13th Aug 2026388 PMAQI
13th Aug 2026369 PMAQI
13th Aug 20263110 PMAQI
13th Aug 20262911 PMAQI
14th Aug 20263312 AMAQI
14th Aug 2026331 AMAQI
14th Aug 2026292 AMAQI
14th Aug 2026293 AMAQI
14th Aug 2026364 AMAQI
25°C20/32°C
14th Aug 2026215 AMAQI
14th Aug 2026216 AMAQI
14th Aug 2026237 AMAQI
14th Aug 2026258 AMAQI
14th Aug 2026259 AMAQI
14th Aug 20262510 AMAQI
14th Aug 20262711 AMAQI
14th Aug 20262312 PMAQI
14th Aug 2026231 PMAQI
14th Aug 2026252 PMAQI
14th Aug 2026383 PMAQI
14th Aug 2026254 PMAQI
14th Aug 2026295 PMAQI
14th Aug 2026256 PMAQI
14th Aug 2026257 PMAQI
14th Aug 2026298 PMAQI
14th Aug 2026299 PMAQI
14th Aug 20262510 PMAQI
14th Aug 20263311 PMAQI
15th Aug 20262512 AMAQI
15th Aug 2026331 AMAQI
15th Aug 2026252 AMAQI
15th Aug 2026293 AMAQI
15th Aug 2026364 AMAQI
24°C17/31°C
15th Aug 2026215 AMAQI
15th Aug 2026336 AMAQI
15th Aug 2026317 AMAQI
15th Aug 2026368 AMAQI
15th Aug 2026129 AMAQI
15th Aug 20262110 AMAQI
15th Aug 20261211 AMAQI
15th Aug 20261212 PMAQI
15th Aug 2026121 PMAQI
15th Aug 2026122 PMAQI
15th Aug 2026123 PMAQI
15th Aug 2026124 PMAQI
15th Aug 2026125 PMAQI
15th Aug 2026116 PMAQI
15th Aug 2026217 PMAQI
15th Aug 2026148 PMAQI
15th Aug 2026129 PMAQI
15th Aug 20262910 PMAQI
15th Aug 20264011 PMAQI
16th Aug 20263812 AMAQI
16th Aug 2026251 AMAQI
16th Aug 2026292 AMAQI
16th Aug 2026293 AMAQI
16th Aug 2026294 AMAQI
22°C15/29°C
16th Aug 2026295 AMAQI
5 AM16th Aug 2026336 AMAQI
16th Aug 2026387 AMAQI
16th Aug 2026318 AMAQI
16th Aug 2026299 AMAQI
16th Aug 20263810 AMAQI
16th Aug 20263611 AMAQI
16th Aug 20263312 PMAQI
12 PM16th Aug 2026331 PMAQI
16th Aug 2026422 PMAQI
16th Aug 2026463 PMAQI
16th Aug 2026484 PMAQI
16th Aug 2026465 PMAQI
16th Aug 2026386 PMAQI
16th Aug 2026427 PMAQI
16th Aug 2026338 PMAQI
8 PM16th Aug 2026179 PMAQI
16th Aug 20262910 PMAQI
16th Aug 20262511 PMAQI
12 AM
4 AM
10°C1/25°C
Day time
Avg. Highest Time
2 PM - 4 PM
35AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
5 AM
30AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 2 PM to 4 PM (Avg. 35), while the lowest AQI was between 5 AM to 5 AM (Avg. 30).
Night time
Avg. Highest Time
12 AM - 1 AM
34AQI
2 hours / Day
60 hours / Month
Avg. Lowest Time
3 AM
29AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 1 AM (Avg. 34), while the lowest AQI was between 3 AM to 3 AM (Avg. 29).
2026 Days Vs Air Quality
Boston, Chelsea, Massachusetts, United States
2026
98%
219
2%
5
Total number of days with different AQI categories in last 228 days in 2026 (137 days remaining)
Good
219 DaysModerate
5 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2026, 98% of 228 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Boston, Chelsea, Massachusetts, United States
AQI levels in 2026
AQI (US)
PM₂.₅
PM₁₀
CO
SO₂
NO₂
O₃
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
33AQI (US)
33AQI (US)
2nd January 2026
30AQI (US)
30AQI (US)
3rd January 2026
27AQI (US)
27AQI (US)
4th January 2026
28AQI (US)
28AQI (US)
5th January 2026
30AQI (US)
30AQI (US)
6th January 2026
56AQI (US)
56AQI (US)
7th January 2026
44AQI (US)
44AQI (US)
8th January 2026
32AQI (US)
32AQI (US)
9th January 2026
37AQI (US)
37AQI (US)
10th January 2026
21AQI (US)
21AQI (US)
11th January 2026
18AQI (US)
18AQI (US)
12th January 2026
18AQI (US)
18AQI (US)
13th January 2026
29AQI (US)
29AQI (US)
14th January 2026
43AQI (US)
43AQI (US)
15th January 2026
50AQI (US)
50AQI (US)
16th January 2026
16AQI (US)
16AQI (US)
17th January 2026
33AQI (US)
33AQI (US)
18th January 2026
61AQI (US)
61AQI (US)
19th January 2026
38AQI (US)
38AQI (US)
20th January 2026
43AQI (US)
43AQI (US)
21st January 2026
36AQI (US)
36AQI (US)
22nd January 2026
37AQI (US)
37AQI (US)
23rd January 2026
37AQI (US)
37AQI (US)
24th January 2026
39AQI (US)
39AQI (US)
25th January 2026
46AQI (US)
46AQI (US)
26th January 2026
47AQI (US)
47AQI (US)
27th January 2026
42AQI (US)
42AQI (US)
28th January 2026
22AQI (US)
22AQI (US)
29th January 2026
26AQI (US)
26AQI (US)
30th January 2026
44AQI (US)
44AQI (US)
31st January 2026
31AQI (US)
31AQI (US)
1st February 2026
28AQI (US)
28AQI (US)
2nd February 2026
32AQI (US)
32AQI (US)
3rd February 2026
30AQI (US)
30AQI (US)
4th February 2026
29AQI (US)
29AQI (US)
5th February 2026
39AQI (US)
39AQI (US)
6th February 2026
33AQI (US)
33AQI (US)
7th February 2026
25AQI (US)
25AQI (US)
8th February 2026
25AQI (US)
25AQI (US)
9th February 2026
34AQI (US)
34AQI (US)
10th February 2026
44AQI (US)
44AQI (US)
11th February 2026
23AQI (US)
23AQI (US)
12th February 2026
34AQI (US)
34AQI (US)
13th February 2026
36AQI (US)
36AQI (US)
14th February 2026
36AQI (US)
36AQI (US)
15th February 2026
25AQI (US)
25AQI (US)
16th February 2026
35AQI (US)
35AQI (US)
17th February 2026
31AQI (US)
31AQI (US)
18th February 2026
39AQI (US)
39AQI (US)
19th February 2026
40AQI (US)
40AQI (US)
20th February 2026
23AQI (US)
23AQI (US)
21st February 2026
33AQI (US)
33AQI (US)
22nd February 2026
25AQI (US)
25AQI (US)
23rd February 2026
37AQI (US)
37AQI (US)
24th February 2026
44AQI (US)
44AQI (US)
25th February 2026
35AQI (US)
35AQI (US)
26th February 2026
20AQI (US)
20AQI (US)
27th February 2026
26AQI (US)
26AQI (US)
28th February 2026
21AQI (US)
21AQI (US)
1st March 2026
26AQI (US)
26AQI (US)
2nd March 2026
40AQI (US)
40AQI (US)
3rd March 2026
25AQI (US)
25AQI (US)
4th March 2026
37AQI (US)
37AQI (US)
5th March 2026
31AQI (US)
31AQI (US)
6th March 2026
17AQI (US)
17AQI (US)
7th March 2026
32AQI (US)
32AQI (US)
8th March 2026
23AQI (US)
23AQI (US)
9th March 2026
28AQI (US)
28AQI (US)
10th March 2026
25AQI (US)
25AQI (US)
11th March 2026
30AQI (US)
30AQI (US)
12th March 2026
20AQI (US)
20AQI (US)
13th March 2026
27AQI (US)
27AQI (US)
14th March 2026
26AQI (US)
26AQI (US)
15th March 2026
36AQI (US)
36AQI (US)
16th March 2026
27AQI (US)
27AQI (US)
17th March 2026
29AQI (US)
29AQI (US)
18th March 2026
29AQI (US)
29AQI (US)
19th March 2026
28AQI (US)
28AQI (US)
20th March 2026
29AQI (US)
29AQI (US)
21st March 2026
28AQI (US)
28AQI (US)
22nd March 2026
23AQI (US)
23AQI (US)
23rd March 2026
40AQI (US)
40AQI (US)
24th March 2026
30AQI (US)
30AQI (US)
25th March 2026
25AQI (US)
25AQI (US)
26th March 2026
18AQI (US)
18AQI (US)
27th March 2026
23AQI (US)
23AQI (US)
28th March 2026
35AQI (US)
35AQI (US)
29th March 2026
26AQI (US)
26AQI (US)
30th March 2026
18AQI (US)
18AQI (US)
31st March 2026
26AQI (US)
26AQI (US)
1st April 2026
28AQI (US)
28AQI (US)
2nd April 2026
20AQI (US)
20AQI (US)
3rd April 2026
20AQI (US)
20AQI (US)
4th April 2026
26AQI (US)
26AQI (US)
5th April 2026
28AQI (US)
28AQI (US)
6th April 2026
29AQI (US)
29AQI (US)
7th April 2026
26AQI (US)
26AQI (US)
8th April 2026
27AQI (US)
27AQI (US)
9th April 2026
20AQI (US)
20AQI (US)
10th April 2026
25AQI (US)
25AQI (US)
11th April 2026
29AQI (US)
29AQI (US)
12th April 2026
29AQI (US)
29AQI (US)
13th April 2026
23AQI (US)
23AQI (US)
14th April 2026
21AQI (US)
21AQI (US)
15th April 2026
17AQI (US)
17AQI (US)
16th April 2026
20AQI (US)
20AQI (US)
17th April 2026
18th April 2026
27AQI (US)
27AQI (US)
19th April 2026
32AQI (US)
32AQI (US)
20th April 2026
29AQI (US)
29AQI (US)
21st April 2026
22AQI (US)
22AQI (US)
22nd April 2026
23rd April 2026
18AQI (US)
18AQI (US)
24th April 2026
20AQI (US)
20AQI (US)
25th April 2026
29AQI (US)
29AQI (US)
26th April 2026
34AQI (US)
34AQI (US)
27th April 2026
15AQI (US)
15AQI (US)
28th April 2026
18AQI (US)
18AQI (US)
29th April 2026
18AQI (US)
18AQI (US)
30th April 2026
23AQI (US)
23AQI (US)
1st May 2026
25AQI (US)
25AQI (US)
2nd May 2026
19AQI (US)
19AQI (US)
3rd May 2026
21AQI (US)
21AQI (US)
4th May 2026
28AQI (US)
28AQI (US)
5th May 2026
26AQI (US)
26AQI (US)
6th May 2026
20AQI (US)
20AQI (US)
7th May 2026
26AQI (US)
26AQI (US)
8th May 2026
27AQI (US)
27AQI (US)
9th May 2026
10th May 2026
26AQI (US)
26AQI (US)
11th May 2026
29AQI (US)
29AQI (US)
12th May 2026
26AQI (US)
26AQI (US)
13th May 2026
19AQI (US)
19AQI (US)
14th May 2026
16AQI (US)
16AQI (US)
15th May 2026
44AQI (US)
44AQI (US)
16th May 2026
47AQI (US)
47AQI (US)
17th May 2026
50AQI (US)
50AQI (US)
18th May 2026
54AQI (US)
54AQI (US)
19th May 2026
53AQI (US)
53AQI (US)
20th May 2026
44AQI (US)
44AQI (US)
21st May 2026
39AQI (US)
39AQI (US)
22nd May 2026
35AQI (US)
35AQI (US)
23rd May 2026
43AQI (US)
43AQI (US)
24th May 2026
47AQI (US)
47AQI (US)
25th May 2026
46AQI (US)
46AQI (US)
26th May 2026
21AQI (US)
21AQI (US)
27th May 2026
14AQI (US)
14AQI (US)
28th May 2026
14AQI (US)
14AQI (US)
29th May 2026
18AQI (US)
18AQI (US)
30th May 2026
16AQI (US)
16AQI (US)
31st May 2026
22AQI (US)
22AQI (US)
1st June 2026
15AQI (US)
15AQI (US)
2nd June 2026
15AQI (US)
15AQI (US)
3rd June 2026
15AQI (US)
15AQI (US)
4th June 2026
17AQI (US)
17AQI (US)
5th June 2026
22AQI (US)
22AQI (US)
6th June 2026
26AQI (US)
26AQI (US)
7th June 2026
14AQI (US)
14AQI (US)
8th June 2026
12AQI (US)
12AQI (US)
9th June 2026
15AQI (US)
15AQI (US)
10th June 2026
16AQI (US)
16AQI (US)
11th June 2026
18AQI (US)
18AQI (US)
12th June 2026
17AQI (US)
17AQI (US)
13th June 2026
12AQI (US)
12AQI (US)
14th June 2026
13AQI (US)
13AQI (US)
15th June 2026
15AQI (US)
15AQI (US)
16th June 2026
16AQI (US)
16AQI (US)
17th June 2026
17AQI (US)
17AQI (US)
18th June 2026
20AQI (US)
20AQI (US)
19th June 2026
14AQI (US)
14AQI (US)
20th June 2026
20AQI (US)
20AQI (US)
21st June 2026
19AQI (US)
19AQI (US)
22nd June 2026
15AQI (US)
15AQI (US)
23rd June 2026
17AQI (US)
17AQI (US)
24th June 2026
13AQI (US)
13AQI (US)
25th June 2026
17AQI (US)
17AQI (US)
26th June 2026
12AQI (US)
12AQI (US)
27th June 2026
22AQI (US)
22AQI (US)
28th June 2026
19AQI (US)
19AQI (US)
29th June 2026
16AQI (US)
16AQI (US)
30th June 2026
17AQI (US)
17AQI (US)
1st July 2026
16AQI (US)
16AQI (US)
2nd July 2026
24AQI (US)
24AQI (US)
3rd July 2026
31AQI (US)
31AQI (US)
4th July 2026
28AQI (US)
28AQI (US)
5th July 2026
28AQI (US)
28AQI (US)
6th July 2026
24AQI (US)
24AQI (US)
7th July 2026
15AQI (US)
15AQI (US)
8th July 2026
15AQI (US)
15AQI (US)
9th July 2026
16AQI (US)
16AQI (US)
10th July 2026
15AQI (US)
15AQI (US)
11th July 2026
21AQI (US)
21AQI (US)
12th July 2026
14AQI (US)
14AQI (US)
13th July 2026
16AQI (US)
16AQI (US)
14th July 2026
18AQI (US)
18AQI (US)
15th July 2026
46AQI (US)
46AQI (US)
16th July 2026
45AQI (US)
45AQI (US)
17th July 2026
44AQI (US)
44AQI (US)
18th July 2026
96AQI (US)
96AQI (US)
19th July 2026
45AQI (US)
45AQI (US)
20th July 2026
32AQI (US)
32AQI (US)
21st July 2026
41AQI (US)
41AQI (US)
22nd July 2026
27AQI (US)
27AQI (US)
23rd July 2026
19AQI (US)
19AQI (US)
24th July 2026
25AQI (US)
25AQI (US)
25th July 2026
30AQI (US)
30AQI (US)
26th July 2026
31AQI (US)
31AQI (US)
27th July 2026
32AQI (US)
32AQI (US)
28th July 2026
36AQI (US)
36AQI (US)
29th July 2026
30AQI (US)
30AQI (US)
30th July 2026
23AQI (US)
23AQI (US)
31st July 2026
26AQI (US)
26AQI (US)
1st August 2026
35AQI (US)
35AQI (US)
2nd August 2026
33AQI (US)
33AQI (US)
3rd August 2026
33AQI (US)
33AQI (US)
4th August 2026
16AQI (US)
16AQI (US)
5th August 2026
30AQI (US)
30AQI (US)
6th August 2026
38AQI (US)
38AQI (US)
7th August 2026
40AQI (US)
40AQI (US)
8th August 2026
27AQI (US)
27AQI (US)
9th August 2026
33AQI (US)
33AQI (US)
10th August 2026
26AQI (US)
26AQI (US)
11th August 2026
32AQI (US)
32AQI (US)
12th August 2026
26AQI (US)
26AQI (US)
13th August 2026
29AQI (US)
29AQI (US)
14th August 2026
27AQI (US)
27AQI (US)
15th August 2026
21AQI (US)
21AQI (US)
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026
35AQI (US)
32AQI (US)
28AQI (US)
24AQI (US)
31AQI (US)
17AQI (US)
29AQI (US)
30AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202628AQI (US)
29
2
28
31
28
28
2
30
30
1
15
219
5
Highest AQI (US) recorded in
January35AQI (US)
Lowest AQI (US) recorded in
June17AQI (US)
202533AQI (US)
25
6
28
31
29
1
31
16
14
23
8
23
8
30
29
2
28
2
27
4
320
45
Highest AQI (US) recorded in
June44AQI (US)
Lowest AQI (US) recorded in
April23AQI (US)
202431AQI (US)
26
5
27
2
31
30
31
29
27
4
22
9
30
31
27
3
29
2
340
22
3
Highest AQI (US) recorded in
July39AQI (US)
Lowest AQI (US) recorded in
September25AQI (US)
202335AQI (US)
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 (US) recorded in
July47AQI (US)
Lowest AQI (US) recorded in
November27AQI (US)
202233AQI (US)
19
11
20
1
27
4
29
30
1
29
1
20
3
2
29
31
29
1
28
3
293
25
Highest AQI (US) recorded in
January42AQI (US)
Lowest AQI (US) recorded in
September26AQI (US)
202133AQI (US)
25
4
22
6
29
2
30
31
25
4
24
7
24
7
30
31
27
3
27
4
325
37
Highest AQI (US) recorded in
July42AQI (US)
Lowest AQI (US) recorded in
October26AQI (US)
202034AQI (US)
13
20
18
28
2
30
1
28
3
26
4
28
3
26
4
26
5
243
22
Highest AQI (US) recorded in
August42AQI (US)
Lowest AQI (US) recorded in
April23AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Most Polluted Year Recorded
2023(Avg.)
35AQI (US)Least Polluted Year Recorded
2026(Avg.)
28AQI (US)Boston's annual 2026 AQI (US) (28) shows an average percentage change of -15.4% (improved AQI (US)) compared to previous years: 2020 (34), 2021 (33), 2022 (33), 2023 (35), 2024 (31), 2025 (33).
