Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Portland, Maine, 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

Portland, Maine, United States

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
4th Aug 2025
82AQI
Lowest AQI recorded on
22nd Aug 2021
11AQI

Same Day Analysis (21st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 15 of Good air quality, showing improvement over 2023 and 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 20th Aug - 21st Aug 2025

Portland, Maine, United States

AQI
Day
Night
.

5 AM20th Aug 2025

7 PM

4 AM21st Aug 2025

Day time
Avg. Highest Time
11AM20th Aug

22AQI

Avg. Lowest Time
6PM20th Aug

16AQI

Night time
Avg. Highest Time
8PM20th Aug

17AQI

Avg. Lowest Time
3AM21st Aug

16AQI

In the last 24 hours,

Portland's AQI reached its highest point of 22 at 11 AM during the Day, while the lowest point, 16, was recorded at 3 AM during the Night between 20th Aug and 21st Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Portland, Maine, United States

JulAug
22nd - 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 - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st
Day
Night
22nd Jul 2025195 AMAQI
22nd Jul 2025206 AMAQI
22nd Jul 2025217 AMAQI
22nd Jul 2025228 AMAQI
22nd Jul 2025229 AMAQI
22nd Jul 20252310 AMAQI
22nd Jul 20252311 AMAQI
22nd Jul 20252312 PMAQI
22nd Jul 2025221 PMAQI
22nd Jul 2025232 PMAQI
22nd Jul 2025223 PMAQI
22nd Jul 2025234 PMAQI
22nd Jul 2025225 PMAQI
22nd Jul 2025216 PMAQI
22nd Jul 2025217 PMAQI
22nd Jul 2025218 PMAQI
22nd Jul 2025219 PMAQI
22nd Jul 20252210 PMAQI
22nd Jul 20252111 PMAQI
23rd Jul 20252112 AMAQI
23rd Jul 2025211 AMAQI
23rd Jul 2025202 AMAQI
23rd Jul 2025203 AMAQI
23rd Jul 2025194 AMAQI

--°C/°C

23rd Jul 2025215 AMAQI
23rd Jul 2025186 AMAQI
23rd Jul 2025197 AMAQI
23rd Jul 2025208 AMAQI
23rd Jul 2025219 AMAQI
23rd Jul 20252310 AMAQI
23rd Jul 20252511 AMAQI
23rd Jul 20252712 PMAQI
23rd Jul 2025271 PMAQI
23rd Jul 2025262 PMAQI
23rd Jul 2025263 PMAQI
23rd Jul 2025264 PMAQI
23rd Jul 2025265 PMAQI
23rd Jul 2025256 PMAQI
23rd Jul 2025237 PMAQI
23rd Jul 2025238 PMAQI
23rd Jul 2025239 PMAQI
23rd Jul 20252410 PMAQI
23rd Jul 20252211 PMAQI
24th Jul 20252112 AMAQI
24th Jul 2025211 AMAQI
24th Jul 2025202 AMAQI
24th Jul 2025203 AMAQI
24th Jul 2025194 AMAQI

19°C17/23°C

24th Jul 2025205 AMAQI
24th Jul 2025236 AMAQI
24th Jul 2025217 AMAQI
24th Jul 2025228 AMAQI
24th Jul 2025229 AMAQI
24th Jul 20252310 AMAQI
24th Jul 20252311 AMAQI
24th Jul 20252412 PMAQI
24th Jul 2025271 PMAQI
24th Jul 2025282 PMAQI
24th Jul 2025273 PMAQI
24th Jul 2025284 PMAQI
24th Jul 2025295 PMAQI
24th Jul 2025306 PMAQI
24th Jul 2025267 PMAQI
24th Jul 2025268 PMAQI
24th Jul 2025299 PMAQI
24th Jul 20252710 PMAQI
24th Jul 20252511 PMAQI
25th Jul 20252412 AMAQI
25th Jul 2025231 AMAQI
25th Jul 2025252 AMAQI
25th Jul 2025263 AMAQI
25th Jul 2025284 AMAQI

21°C17/26°C

25th Jul 2025295 AMAQI
25th Jul 2025286 AMAQI
25th Jul 2025287 AMAQI
25th Jul 2025278 AMAQI
25th Jul 2025279 AMAQI
25th Jul 20252610 AMAQI
25th Jul 20252711 AMAQI
25th Jul 20252712 PMAQI
25th Jul 2025271 PMAQI
25th Jul 2025292 PMAQI
25th Jul 2025283 PMAQI
25th Jul 2025274 PMAQI
25th Jul 2025265 PMAQI
25th Jul 2025256 PMAQI
25th Jul 2025267 PMAQI
25th Jul 2025268 PMAQI
25th Jul 2025249 PMAQI
25th Jul 20252610 PMAQI
25th Jul 20252811 PMAQI
26th Jul 20253012 AMAQI
26th Jul 2025461 AMAQI
26th Jul 2025522 AMAQI
26th Jul 2025523 AMAQI
26th Jul 2025534 AMAQI

23°C20/27°C

26th Jul 2025525 AMAQI
26th Jul 2025526 AMAQI
26th Jul 2025537 AMAQI
26th Jul 2025508 AMAQI
26th Jul 2025469 AMAQI
26th Jul 20254310 AMAQI
26th Jul 20254011 AMAQI
26th Jul 20253712 PMAQI
26th Jul 2025351 PMAQI
26th Jul 2025352 PMAQI
26th Jul 2025353 PMAQI
26th Jul 2025374 PMAQI
26th Jul 2025375 PMAQI
26th Jul 2025366 PMAQI
26th Jul 2025397 PMAQI
26th Jul 2025368 PMAQI
26th Jul 2025369 PMAQI
26th Jul 20253610 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253612 AMAQI
27th Jul 2025311 AMAQI
27th Jul 2025332 AMAQI
27th Jul 2025333 AMAQI
27th Jul 2025354 AMAQI

20°C17/25°C

27th Jul 2025375 AMAQI
27th Jul 2025386 AMAQI
27th Jul 2025387 AMAQI
27th Jul 2025398 AMAQI
27th Jul 2025409 AMAQI
27th Jul 20254110 AMAQI
27th Jul 20254111 AMAQI
27th Jul 20254112 PMAQI
27th Jul 2025421 PMAQI
27th Jul 2025402 PMAQI
27th Jul 2025413 PMAQI
27th Jul 2025394 PMAQI
27th Jul 2025395 PMAQI
27th Jul 2025376 PMAQI
27th Jul 2025387 PMAQI
27th Jul 2025378 PMAQI
27th Jul 2025359 PMAQI
27th Jul 20253410 PMAQI
27th Jul 20253511 PMAQI
28th Jul 20253512 AMAQI
28th Jul 2025351 AMAQI
28th Jul 2025322 AMAQI
28th Jul 2025323 AMAQI
28th Jul 2025304 AMAQI

18°C16/20°C

28th Jul 2025315 AMAQI
28th Jul 2025296 AMAQI
28th Jul 2025307 AMAQI
28th Jul 2025308 AMAQI
28th Jul 2025319 AMAQI
28th Jul 20253110 AMAQI
28th Jul 20253211 AMAQI
28th Jul 20253312 PMAQI
28th Jul 2025331 PMAQI
28th Jul 2025342 PMAQI
28th Jul 2025333 PMAQI
28th Jul 2025334 PMAQI
28th Jul 2025335 PMAQI
28th Jul 2025326 PMAQI
28th Jul 2025337 PMAQI
28th Jul 2025338 PMAQI
28th Jul 2025329 PMAQI
28th Jul 20253210 PMAQI
28th Jul 20253111 PMAQI
29th Jul 20253012 AMAQI
29th Jul 2025301 AMAQI
29th Jul 2025292 AMAQI
29th Jul 2025273 AMAQI
29th Jul 2025284 AMAQI

19°C16/22°C

29th Jul 2025285 AMAQI
29th Jul 2025286 AMAQI
29th Jul 2025297 AMAQI
29th Jul 2025298 AMAQI
29th Jul 2025299 AMAQI
29th Jul 20253010 AMAQI
29th Jul 20253111 AMAQI
29th Jul 20253212 PMAQI
29th Jul 2025301 PMAQI
29th Jul 2025322 PMAQI
29th Jul 2025313 PMAQI
29th Jul 2025314 PMAQI
29th Jul 2025315 PMAQI
29th Jul 2025316 PMAQI
29th Jul 2025307 PMAQI
29th Jul 2025318 PMAQI
29th Jul 2025309 PMAQI
29th Jul 20252910 PMAQI
29th Jul 20253011 PMAQI
30th Jul 20253112 AMAQI
30th Jul 2025291 AMAQI
30th Jul 2025282 AMAQI
30th Jul 2025283 AMAQI
30th Jul 2025274 AMAQI

23°C17/30°C

30th Jul 2025275 AMAQI
30th Jul 2025276 AMAQI
30th Jul 2025287 AMAQI
30th Jul 2025288 AMAQI
30th Jul 2025289 AMAQI
30th Jul 20252810 AMAQI
30th Jul 20252811 AMAQI
30th Jul 20252912 PMAQI
30th Jul 2025291 PMAQI
30th Jul 2025312 PMAQI
30th Jul 2025313 PMAQI
30th Jul 2025314 PMAQI
30th Jul 2025315 PMAQI
30th Jul 2025316 PMAQI
30th Jul 2025317 PMAQI
30th Jul 2025318 PMAQI
30th Jul 2025349 PMAQI
30th Jul 20253410 PMAQI
30th Jul 20253311 PMAQI
31st Jul 20253212 AMAQI
31st Jul 2025311 AMAQI
31st Jul 2025312 AMAQI
31st Jul 2025293 AMAQI
31st Jul 2025284 AMAQI

21°C19/23°C

31st Jul 2025275 AMAQI
31st Jul 2025286 AMAQI
31st Jul 2025327 AMAQI
31st Jul 2025328 AMAQI
31st Jul 2025339 AMAQI
31st Jul 20253610 AMAQI
31st Jul 20254011 AMAQI
31st Jul 20254412 PMAQI
31st Jul 2025441 PMAQI
31st Jul 2025422 PMAQI
31st Jul 2025383 PMAQI
31st Jul 2025374 PMAQI
31st Jul 2025375 PMAQI
31st Jul 2025376 PMAQI
31st Jul 2025367 PMAQI
31st Jul 2025388 PMAQI
31st Jul 2025389 PMAQI
31st Jul 20253810 PMAQI
31st Jul 20253811 PMAQI
1st Aug 20253512 AMAQI
1st Aug 2025341 AMAQI
1st Aug 2025332 AMAQI
1st Aug 2025333 AMAQI
1st Aug 2025344 AMAQI

18°C16/20°C

1st Aug 2025325 AMAQI
1st Aug 2025316 AMAQI
1st Aug 2025297 AMAQI
1st Aug 2025278 AMAQI
1st Aug 2025259 AMAQI
1st Aug 20252410 AMAQI
1st Aug 20252211 AMAQI
1st Aug 20252112 PMAQI
1st Aug 2025221 PMAQI
1st Aug 2025212 PMAQI
1st Aug 2025213 PMAQI
1st Aug 2025194 PMAQI
1st Aug 2025195 PMAQI
1st Aug 2025186 PMAQI
1st Aug 2025297 PMAQI
1st Aug 2025248 PMAQI
1st Aug 2025199 PMAQI
1st Aug 20252110 PMAQI
1st Aug 20252311 PMAQI
2nd Aug 20252512 AMAQI
2nd Aug 2025221 AMAQI
2nd Aug 2025202 AMAQI
2nd Aug 2025203 AMAQI
2nd Aug 2025194 AMAQI

18°C16/21°C

2nd Aug 2025185 AMAQI
2nd Aug 2025176 AMAQI
2nd Aug 2025177 AMAQI
2nd Aug 2025178 AMAQI
2nd Aug 2025169 AMAQI
2nd Aug 20251710 AMAQI
2nd Aug 20251611 AMAQI
2nd Aug 20251612 PMAQI
2nd Aug 2025161 PMAQI
2nd Aug 2025152 PMAQI
2nd Aug 2025163 PMAQI
2nd Aug 2025164 PMAQI
2nd Aug 2025165 PMAQI
2nd Aug 2025166 PMAQI
2nd Aug 2025187 PMAQI
2nd Aug 2025188 PMAQI
2nd Aug 2025209 PMAQI
2nd Aug 20252410 PMAQI
2nd Aug 20252411 PMAQI
3rd Aug 20252612 AMAQI
3rd Aug 2025271 AMAQI
3rd Aug 2025262 AMAQI
3rd Aug 2025253 AMAQI
3rd Aug 2025244 AMAQI

19°C15/24°C

3rd Aug 2025235 AMAQI
3rd Aug 2025246 AMAQI
3rd Aug 2025267 AMAQI
3rd Aug 2025278 AMAQI
3rd Aug 2025289 AMAQI
3rd Aug 20252810 AMAQI
3rd Aug 20252911 AMAQI
3rd Aug 20253012 PMAQI
3rd Aug 2025321 PMAQI
3rd Aug 2025342 PMAQI
3rd Aug 2025353 PMAQI
3rd Aug 2025354 PMAQI
3rd Aug 2025375 PMAQI
3rd Aug 2025356 PMAQI
3rd Aug 2025307 PMAQI
3rd Aug 2025328 PMAQI
3rd Aug 2025349 PMAQI
3rd Aug 20253110 PMAQI
3rd Aug 20253011 PMAQI
4th Aug 20253012 AMAQI
4th Aug 2025311 AMAQI
4th Aug 2025332 AMAQI
4th Aug 2025313 AMAQI
4th Aug 2025324 AMAQI

20°C15/24°C

4th Aug 2025315 AMAQI
4th Aug 2025316 AMAQI
4th Aug 2025327 AMAQI
4th Aug 2025348 AMAQI
4th Aug 2025359 AMAQI
4th Aug 20253710 AMAQI
4th Aug 20253911 AMAQI
4th Aug 20254112 PMAQI
4th Aug 2025451 PMAQI
4th Aug 2025462 PMAQI
4th Aug 2025463 PMAQI
4th Aug 2025494 PMAQI
4th Aug 2025495 PMAQI
4th Aug 2025526 PMAQI
4th Aug 2025347 PMAQI
4th Aug 2025478 PMAQI
4th Aug 2025569 PMAQI
4th Aug 20256310 PMAQI
4th Aug 20256511 PMAQI
5th Aug 20256812 AMAQI
5th Aug 2025661 AMAQI
5th Aug 2025622 AMAQI
5th Aug 2025603 AMAQI
5th Aug 2025604 AMAQI

21°C17/26°C

5th Aug 2025585 AMAQI
5th Aug 2025546 AMAQI
5th Aug 2025507 AMAQI
5th Aug 2025448 AMAQI
5th Aug 2025429 AMAQI
5th Aug 20254110 AMAQI
5th Aug 20253611 AMAQI
5th Aug 20253612 PMAQI
5th Aug 2025361 PMAQI
5th Aug 2025402 PMAQI
5th Aug 2025433 PMAQI
5th Aug 2025434 PMAQI
5th Aug 2025425 PMAQI
5th Aug 2025416 PMAQI
5th Aug 2025477 PMAQI
5th Aug 2025438 PMAQI
5th Aug 2025359 PMAQI
5th Aug 20253510 PMAQI
5th Aug 20253511 PMAQI
6th Aug 20253312 AMAQI
6th Aug 2025311 AMAQI
6th Aug 2025282 AMAQI
6th Aug 2025273 AMAQI
6th Aug 2025264 AMAQI

20°C18/23°C

6th Aug 2025265 AMAQI
6th Aug 2025266 AMAQI
6th Aug 2025277 AMAQI
6th Aug 2025288 AMAQI
6th Aug 2025289 AMAQI
6th Aug 20252710 AMAQI
6th Aug 20252611 AMAQI
6th Aug 20252712 PMAQI
6th Aug 2025281 PMAQI
6th Aug 2025282 PMAQI
6th Aug 2025293 PMAQI
6th Aug 2025294 PMAQI
6th Aug 2025305 PMAQI
6th Aug 2025306 PMAQI
6th Aug 2025287 PMAQI
6th Aug 2025298 PMAQI
6th Aug 2025299 PMAQI
6th Aug 20252810 PMAQI
6th Aug 20253111 PMAQI
7th Aug 20253012 AMAQI
7th Aug 2025321 AMAQI
7th Aug 2025312 AMAQI
7th Aug 2025303 AMAQI
7th Aug 2025304 AMAQI

18°C17/20°C

7th Aug 2025315 AMAQI
7th Aug 2025336 AMAQI
7th Aug 2025327 AMAQI
7th Aug 2025318 AMAQI
7th Aug 2025329 AMAQI
7th Aug 20253110 AMAQI
7th Aug 20253011 AMAQI
7th Aug 20252912 PMAQI
7th Aug 2025311 PMAQI
7th Aug 2025302 PMAQI
7th Aug 2025303 PMAQI
7th Aug 2025294 PMAQI
7th Aug 2025295 PMAQI
7th Aug 2025286 PMAQI
7th Aug 2025297 PMAQI
7th Aug 2025298 PMAQI
7th Aug 2025289 PMAQI
7th Aug 20252810 PMAQI
7th Aug 20252911 PMAQI
8th Aug 20252812 AMAQI
8th Aug 2025251 AMAQI
8th Aug 2025222 AMAQI
8th Aug 2025203 AMAQI
8th Aug 2025194 AMAQI

18°C14/21°C

8th Aug 2025185 AMAQI
8th Aug 2025206 AMAQI
8th Aug 2025227 AMAQI
8th Aug 2025228 AMAQI
8th Aug 2025229 AMAQI
8th Aug 20252310 AMAQI
8th Aug 20252411 AMAQI
8th Aug 20252612 PMAQI
8th Aug 2025251 PMAQI
8th Aug 2025242 PMAQI
8th Aug 2025233 PMAQI
8th Aug 2025244 PMAQI
8th Aug 2025245 PMAQI
8th Aug 2025246 PMAQI
8th Aug 2025237 PMAQI
8th Aug 2025238 PMAQI
8th Aug 2025239 PMAQI
8th Aug 20252410 PMAQI
8th Aug 20252411 PMAQI
9th Aug 20252412 AMAQI
9th Aug 2025231 AMAQI
9th Aug 2025242 AMAQI
9th Aug 2025243 AMAQI
9th Aug 2025224 AMAQI

20°C18/22°C

9th Aug 2025235 AMAQI
9th Aug 2025236 AMAQI
9th Aug 2025247 AMAQI
9th Aug 2025238 AMAQI
9th Aug 2025239 AMAQI
9th Aug 20252210 AMAQI
9th Aug 20252411 AMAQI
9th Aug 20252712 PMAQI
9th Aug 2025241 PMAQI
9th Aug 2025242 PMAQI
9th Aug 2025253 PMAQI
9th Aug 2025244 PMAQI
9th Aug 2025235 PMAQI
9th Aug 2025236 PMAQI
9th Aug 2025237 PMAQI
9th Aug 2025248 PMAQI
9th Aug 2025249 PMAQI
9th Aug 20252410 PMAQI
9th Aug 20252511 PMAQI
10th Aug 20252612 AMAQI
10th Aug 2025261 AMAQI
10th Aug 2025262 AMAQI
10th Aug 2025253 AMAQI
10th Aug 2025254 AMAQI

19°C17/23°C

10th Aug 2025265 AMAQI
10th Aug 2025276 AMAQI
10th Aug 2025257 AMAQI
10th Aug 2025278 AMAQI
10th Aug 2025269 AMAQI
10th Aug 20252610 AMAQI
10th Aug 20252711 AMAQI
10th Aug 20252812 PMAQI
10th Aug 2025301 PMAQI
10th Aug 2025322 PMAQI
10th Aug 2025313 PMAQI
10th Aug 2025324 PMAQI
10th Aug 2025325 PMAQI
10th Aug 2025316 PMAQI
10th Aug 2025287 PMAQI
10th Aug 2025298 PMAQI
10th Aug 2025319 PMAQI
10th Aug 20253010 PMAQI
10th Aug 20253011 PMAQI
11th Aug 20252812 AMAQI
11th Aug 2025291 AMAQI
11th Aug 2025272 AMAQI
11th Aug 2025273 AMAQI
11th Aug 2025274 AMAQI

19°C17/21°C

11th Aug 2025275 AMAQI
11th Aug 2025286 AMAQI
11th Aug 2025297 AMAQI
11th Aug 2025308 AMAQI
11th Aug 2025329 AMAQI
11th Aug 20253310 AMAQI
11th Aug 20253611 AMAQI
11th Aug 20253812 PMAQI
11th Aug 2025391 PMAQI
11th Aug 2025412 PMAQI
11th Aug 2025423 PMAQI
11th Aug 2025414 PMAQI
11th Aug 2025415 PMAQI
11th Aug 2025406 PMAQI
11th Aug 2025347 PMAQI
11th Aug 2025358 PMAQI
11th Aug 2025359 PMAQI
11th Aug 20253410 PMAQI
11th Aug 20253511 PMAQI
12th Aug 20253412 AMAQI
12th Aug 2025351 AMAQI
12th Aug 2025352 AMAQI
12th Aug 2025373 AMAQI
12th Aug 2025404 AMAQI

20°C18/22°C

12th Aug 2025405 AMAQI
12th Aug 2025396 AMAQI
12th Aug 2025407 AMAQI
12th Aug 2025418 AMAQI
12th Aug 2025409 AMAQI
12th Aug 20254110 AMAQI
12th Aug 20254211 AMAQI
12th Aug 20254412 PMAQI
12th Aug 2025451 PMAQI
12th Aug 2025472 PMAQI
12th Aug 2025473 PMAQI
12th Aug 2025474 PMAQI
12th Aug 2025465 PMAQI
12th Aug 2025436 PMAQI
12th Aug 2025407 PMAQI
12th Aug 2025408 PMAQI
12th Aug 2025419 PMAQI
12th Aug 20254310 PMAQI
12th Aug 20254711 PMAQI
13th Aug 20254712 AMAQI
13th Aug 2025461 AMAQI
13th Aug 2025452 AMAQI
13th Aug 2025453 AMAQI
13th Aug 2025474 AMAQI

20°C18/22°C

13th Aug 2025495 AMAQI
13th Aug 2025486 AMAQI
13th Aug 2025497 AMAQI
13th Aug 2025458 AMAQI
13th Aug 2025429 AMAQI
13th Aug 20254110 AMAQI
13th Aug 20253911 AMAQI
13th Aug 20254012 PMAQI
13th Aug 2025391 PMAQI
13th Aug 2025382 PMAQI
13th Aug 2025373 PMAQI
13th Aug 2025374 PMAQI
13th Aug 2025355 PMAQI
13th Aug 2025326 PMAQI
13th Aug 2025417 PMAQI
13th Aug 2025358 PMAQI
13th Aug 2025309 PMAQI
13th Aug 20252810 PMAQI
13th Aug 20252611 PMAQI
14th Aug 20252512 AMAQI
14th Aug 2025241 AMAQI
14th Aug 2025252 AMAQI
14th Aug 2025253 AMAQI
14th Aug 2025244 AMAQI

19°C16/21°C

14th Aug 2025245 AMAQI
14th Aug 2025236 AMAQI
14th Aug 2025237 AMAQI
14th Aug 2025248 AMAQI
14th Aug 2025249 AMAQI
14th Aug 20252710 AMAQI
14th Aug 20252711 AMAQI
14th Aug 20252712 PMAQI
14th Aug 2025281 PMAQI
14th Aug 2025262 PMAQI
14th Aug 2025253 PMAQI
14th Aug 2025254 PMAQI
14th Aug 2025245 PMAQI
14th Aug 2025246 PMAQI
14th Aug 2025267 PMAQI
14th Aug 2025268 PMAQI
14th Aug 2025269 PMAQI
14th Aug 20252810 PMAQI
14th Aug 20253111 PMAQI
15th Aug 20253112 AMAQI
15th Aug 2025291 AMAQI
15th Aug 2025282 AMAQI
15th Aug 2025253 AMAQI
15th Aug 2025224 AMAQI

22°C21/25°C

15th Aug 2025205 AMAQI
15th Aug 2025206 AMAQI
15th Aug 2025177 AMAQI
15th Aug 2025188 AMAQI
15th Aug 2025179 AMAQI
15th Aug 20251610 AMAQI
15th Aug 20251711 AMAQI
15th Aug 20251512 PMAQI
15th Aug 2025151 PMAQI
15th Aug 2025152 PMAQI
15th Aug 2025163 PMAQI
15th Aug 2025154 PMAQI
15th Aug 2025165 PMAQI
15th Aug 2025156 PMAQI
15th Aug 2025187 PMAQI
15th Aug 2025178 PMAQI
15th Aug 2025169 PMAQI
15th Aug 20251610 PMAQI
15th Aug 20251811 PMAQI
16th Aug 20251912 AMAQI
16th Aug 2025191 AMAQI
16th Aug 2025182 AMAQI
16th Aug 2025163 AMAQI
16th Aug 2025154 AMAQI

21°C19/25°C

16th Aug 2025155 AMAQI
16th Aug 2025156 AMAQI
16th Aug 2025157 AMAQI
16th Aug 2025158 AMAQI
16th Aug 2025169 AMAQI
16th Aug 20251810 AMAQI
16th Aug 20251911 AMAQI
16th Aug 20252112 PMAQI
16th Aug 2025211 PMAQI
16th Aug 2025212 PMAQI
16th Aug 2025203 PMAQI
16th Aug 2025204 PMAQI
16th Aug 2025195 PMAQI
16th Aug 2025196 PMAQI
16th Aug 2025187 PMAQI
16th Aug 2025188 PMAQI
16th Aug 2025199 PMAQI
16th Aug 20251810 PMAQI
16th Aug 20252011 PMAQI
17th Aug 20252012 AMAQI
17th Aug 2025211 AMAQI
17th Aug 2025212 AMAQI
17th Aug 2025203 AMAQI
17th Aug 2025214 AMAQI

20°C17/23°C

17th Aug 2025215 AMAQI
17th Aug 2025216 AMAQI
17th Aug 2025217 AMAQI
17th Aug 2025228 AMAQI
17th Aug 2025249 AMAQI
17th Aug 20252510 AMAQI
17th Aug 20252611 AMAQI
17th Aug 20252512 PMAQI
17th Aug 2025261 PMAQI
17th Aug 2025252 PMAQI
17th Aug 2025243 PMAQI
17th Aug 2025254 PMAQI
17th Aug 2025255 PMAQI
17th Aug 2025256 PMAQI
17th Aug 2025237 PMAQI
17th Aug 2025228 PMAQI
17th Aug 2025209 PMAQI
17th Aug 20251910 PMAQI
17th Aug 20251911 PMAQI
18th Aug 20251912 AMAQI
18th Aug 2025191 AMAQI
18th Aug 2025182 AMAQI
18th Aug 2025193 AMAQI
18th Aug 2025184 AMAQI

20°C17/23°C

18th Aug 2025195 AMAQI
18th Aug 2025186 AMAQI
18th Aug 2025197 AMAQI
18th Aug 2025188 AMAQI
18th Aug 2025179 AMAQI
18th Aug 20251810 AMAQI
18th Aug 20251711 AMAQI
18th Aug 20251712 PMAQI
18th Aug 2025171 PMAQI
18th Aug 2025162 PMAQI
18th Aug 2025163 PMAQI
18th Aug 2025154 PMAQI
18th Aug 2025165 PMAQI
18th Aug 2025166 PMAQI
18th Aug 2025177 PMAQI
18th Aug 2025168 PMAQI
18th Aug 2025189 PMAQI
18th Aug 20251910 PMAQI
18th Aug 20252011 PMAQI
19th Aug 20251912 AMAQI
19th Aug 2025191 AMAQI
19th Aug 2025192 AMAQI
19th Aug 2025183 AMAQI
19th Aug 2025204 AMAQI

18°C14/20°C

19th Aug 2025205 AMAQI
19th Aug 2025196 AMAQI
19th Aug 2025197 AMAQI
19th Aug 2025198 AMAQI
19th Aug 2025209 AMAQI
19th Aug 20252110 AMAQI
19th Aug 20252211 AMAQI
19th Aug 20252412 PMAQI
19th Aug 2025221 PMAQI
19th Aug 2025202 PMAQI
19th Aug 2025193 PMAQI
19th Aug 2025184 PMAQI
19th Aug 2025175 PMAQI
19th Aug 2025176 PMAQI
19th Aug 2025187 PMAQI
19th Aug 2025188 PMAQI
19th Aug 2025179 PMAQI
19th Aug 20251710 PMAQI
19th Aug 20251711 PMAQI
20th Aug 20251712 AMAQI
20th Aug 2025171 AMAQI
20th Aug 2025182 AMAQI
20th Aug 2025193 AMAQI
20th Aug 2025194 AMAQI

17°C13/21°C

20th Aug 2025195 AMAQI
20th Aug 2025196 AMAQI
20th Aug 2025197 AMAQI
20th Aug 2025208 AMAQI
20th Aug 2025219 AMAQI
20th Aug 20252110 AMAQI
20th Aug 20252211 AMAQI
20th Aug 20252212 PMAQI
20th Aug 2025211 PMAQI
20th Aug 2025212 PMAQI
20th Aug 2025203 PMAQI
20th Aug 2025204 PMAQI
20th Aug 2025175 PMAQI
20th Aug 2025166 PMAQI
20th Aug 2025187 PMAQI
20th Aug 2025178 PMAQI
20th Aug 2025179 PMAQI
20th Aug 20251610 PMAQI
20th Aug 20251611 PMAQI
21st Aug 20251612 AMAQI
21st Aug 2025171 AMAQI
21st Aug 2025172 AMAQI
21st Aug 2025163 AMAQI
21st Aug 2025174 AMAQI

18°C17/19°C

21st Aug 2025185 AMAQI
5 AM
21st Aug 2025196 AMAQI
21st Aug 2025187 AMAQI
21st Aug 2025198 AMAQI
21st Aug 2025209 AMAQI
21st Aug 20252210 AMAQI
21st Aug 20252311 AMAQI
21st Aug 20252412 PMAQI
12 PM
21st Aug 2025241 PMAQI
21st Aug 2025242 PMAQI
21st Aug 2025223 PMAQI
21st Aug 2025224 PMAQI
21st Aug 2025215 PMAQI
21st Aug 2025216 PMAQI
21st Aug 2025197 PMAQI
7 PM
21st Aug 2025208 PMAQI
21st Aug 2025219 PMAQI
21st Aug 20252110 PMAQI
21st Aug 20252211 PMAQI
12 AM
4 AM

16°C12/18°C

Day time
Avg. Highest Time
12 PM - 5 PM

29AQI

6 hours / Day
180 hours / Month
Avg. Lowest Time
5 AM - 9 AM

27AQI

5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 PM to 5 PM (Avg. 29), while the lowest AQI was between 5 AM to 9 AM (Avg. 27).
Night time
Avg. Highest Time
11 PM

29AQI

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

27AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 PM to 11 PM (Avg. 29), while the lowest AQI was between 3 AM to 4 AM (Avg. 27).

2025 Days Vs Air Quality

Portland, Maine, United States

2025

91%

213

8%

19

0.4%

1

Total number of days with different AQI categories in last 234 days in 2025 (131 days remaining)

Good
213 Days
Moderate
19 Days
Poor
1 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 91%

Health Risk Level:

Very Low

In 2025, 91% of 234 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

Portland, Maine, 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
24AQI
2nd January 2025
20AQI
3rd January 2025
19AQI
4th January 2025
18AQI
5th January 2025
19AQI
6th January 2025
20AQI
7th January 2025
19AQI
8th January 2025
17AQI
9th January 2025
18AQI
10th January 2025
20AQI
11th January 2025
25AQI
12th January 2025
31AQI
13th January 2025
41AQI
14th January 2025
25AQI
15th January 2025
22AQI
16th January 2025
37AQI
17th January 2025
43AQI
18th January 2025
34AQI
19th January 2025
22AQI
20th January 2025
23AQI
21st January 2025
36AQI
22nd January 2025
50AQI
23rd January 2025
47AQI
24th January 2025
45AQI
25th January 2025
39AQI
26th January 2025
36AQI
27th January 2025
22AQI
28th January 2025
21AQI
29th January 2025
26AQI
30th January 2025
24AQI
31st January 2025
31AQI
1st February 2025
21AQI
2nd February 2025
26AQI
3rd February 2025
33AQI
4th February 2025
23AQI
5th February 2025
27AQI
6th February 2025
38AQI
7th February 2025
27AQI
8th February 2025
26AQI
9th February 2025
23AQI
10th February 2025
30AQI
11th February 2025
40AQI
12th February 2025
29AQI
13th February 2025
23AQI
14th February 2025
22AQI
15th February 2025
22AQI
16th February 2025
20AQI
17th February 2025
19AQI
18th February 2025
19AQI
19th February 2025
25AQI
20th February 2025
26AQI
21st February 2025
20AQI
22nd February 2025
26AQI
23rd February 2025
30AQI
24th February 2025
43AQI
25th February 2025
44AQI
26th February 2025
32AQI
27th February 2025
29AQI
28th February 2025
21AQI
1st March 2025
27AQI
2nd March 2025
20AQI
3rd March 2025
28AQI
4th March 2025
37AQI
5th March 2025
33AQI
6th March 2025
20AQI
7th March 2025
18AQI
8th March 2025
20AQI
9th March 2025
20AQI
10th March 2025
23AQI
11th March 2025
28AQI
12th March 2025
21AQI
13th March 2025
22AQI
14th March 2025
29AQI
15th March 2025
24AQI
16th March 2025
28AQI
17th March 2025
21AQI
18th March 2025
23AQI
19th March 2025
24AQI
20th March 2025
15AQI
21st March 2025
14AQI
22nd March 2025
20AQI
23rd March 2025
17AQI
24th March 2025
20AQI
25th March 2025
23AQI
26th March 2025
23AQI
27th March 2025
20AQI
28th March 2025
20AQI
29th March 2025
18AQI
30th March 2025
26AQI
31st March 2025
23AQI
1st April 2025
18AQI
2nd April 2025
17AQI
3rd April 2025
22AQI
4th April 2025
23AQI
5th April 2025
20AQI
6th April 2025
13AQI
7th April 2025
15AQI
8th April 2025
15AQI
9th April 2025
20AQI
10th April 2025
21AQI
11th April 2025
22AQI
12th April 2025
17AQI
13th April 2025
20AQI
14th April 2025
17AQI
15th April 2025
33AQI
16th April 2025
18AQI
17th April 2025
19AQI
18th April 2025
24AQI
19th April 2025
44AQI
20th April 2025
17AQI
21st April 2025
15AQI
22nd April 2025
26AQI
23rd April 2025
20AQI
24th April 2025
18AQI
25th April 2025
27AQI
26th April 2025
25AQI
27th April 2025
13AQI
28th April 2025
17AQI
29th April 2025
34AQI
30th April 2025
21AQI
1st May 2025
18AQI
2nd May 2025
32AQI
3rd May 2025
35AQI
4th May 2025
24AQI
5th May 2025
21AQI
6th May 2025
18AQI
7th May 2025
26AQI
8th May 2025
26AQI
9th May 2025
21AQI
10th May 2025
13AQI
11th May 2025
15AQI
12th May 2025
20AQI
13th May 2025
25AQI
14th May 2025
28AQI
15th May 2025
38AQI
16th May 2025
34AQI
17th May 2025
19AQI
18th May 2025
15AQI
19th May 2025
13AQI
20th May 2025
12AQI
21st May 2025
16AQI
22nd May 2025
19AQI
23rd May 2025
11AQI
24th May 2025
11AQI
25th May 2025
13AQI
26th May 2025
16AQI
27th May 2025
22AQI
28th May 2025
29AQI
29th May 2025
21AQI
30th May 2025
24AQI
31st May 2025
23AQI
1st June 2025
20AQI
2nd June 2025
20AQI
3rd June 2025
22AQI
4th June 2025
42AQI
5th June 2025
62AQI
6th June 2025
58AQI
7th June 2025
52AQI
8th June 2025
79AQI
9th June 2025
78AQI
10th June 2025
37AQI
11th June 2025
43AQI
12th June 2025
65AQI
13th June 2025
38AQI
14th June 2025
35AQI
15th June 2025
32AQI
16th June 2025
29AQI
17th June 2025
25AQI
18th June 2025
22AQI
19th June 2025
32AQI
20th June 2025
34AQI
21st June 2025
30AQI
22nd June 2025
36AQI
23rd June 2025
48AQI
24th June 2025
55AQI
25th June 2025
51AQI
26th June 2025
31AQI
27th June 2025
25AQI
28th June 2025
20AQI
29th June 2025
25AQI
30th June 2025
28AQI
1st July 2025
38AQI
2nd July 2025
35AQI
3rd July 2025
46AQI
4th July 2025
39AQI
5th July 2025
33AQI
6th July 2025
46AQI
7th July 2025
54AQI
8th July 2025
38AQI
9th July 2025
29AQI
10th July 2025
26AQI
11th July 2025
22AQI
12th July 2025
23AQI
13th July 2025
19AQI
14th July 2025
21AQI
15th July 2025
32AQI
16th July 2025
40AQI
17th July 2025
36AQI
18th July 2025
18AQI
19th July 2025
27AQI
20th July 2025
23AQI
21st July 2025
26AQI
22nd July 2025
15AQI
23rd July 2025
24AQI
24th July 2025
34AQI
25th July 2025
49AQI
26th July 2025
111AQI
27th July 2025
77AQI
28th July 2025
59AQI
29th July 2025
58AQI
30th July 2025
48AQI
31st July 2025
70AQI
1st August 2025
49AQI
2nd August 2025
25AQI
3rd August 2025
54AQI
4th August 2025
82AQI
5th August 2025
72AQI
6th August 2025
50AQI
7th August 2025
64AQI
8th August 2025
34AQI
9th August 2025
31AQI
10th August 2025
34AQI
11th August 2025
49AQI
12th August 2025
62AQI
13th August 2025
61AQI
14th August 2025
48AQI
15th August 2025
34AQI
16th August 2025
32AQI
17th August 2025
38AQI
18th August 2025
18AQI
19th August 2025
17AQI
20th August 2025
19AQI
21st August 2025
15AQI
22nd August 2025
23rd August 2025
24th August 2025
25th August 2025
26th August 2025
27th August 2025
28th August 2025
29th August 2025
30th August 2025
31st August 2025
1st September 2025
2nd September 2025
3rd September 2025
4th September 2025
5th September 2025
6th September 2025
7th September 2025
8th September 2025
9th September 2025
10th September 2025
11th September 2025
12th September 2025
13th September 2025
14th September 2025
15th September 2025
16th September 2025
17th September 2025
18th September 2025
19th September 2025
20th September 2025
21st September 2025
22nd September 2025
23rd September 2025
24th September 2025
25th September 2025
26th September 2025
27th September 2025
28th September 2025
29th September 2025
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
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

28AQI

27AQI

23AQI

21AQI

21AQI

39AQI

39AQI

42AQI

No. of days

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

202530AQI

31
28
31
30
31
22
8
25
5
1
15
6
213
19
1

Highest AQI recorded in

August

42AQI

Lowest AQI recorded in

April

21AQI

202424AQI

31
29
31
30
31
29
1
29
2
26
5
30
31
30
29
2
356
10

Highest AQI recorded in

July

31AQI

Lowest AQI recorded in

March

17AQI

202326AQI

31
28
31
30
31
26
4
24
7
27
4
22
8
30
1
28
1
31
339
25

Highest AQI recorded in

July

38AQI

Lowest AQI recorded in

January

19AQI

202222AQI

29
1
21
31
30
31
30
24
1
1
29
31
30
25
2
312
4

Highest AQI recorded in

July

30AQI

Lowest AQI recorded in

August

14AQI

202123AQI

29
1
28
31
28
20
29
1
28
3
28
3
30
31
30
31
343
8

Highest AQI recorded in

June

29AQI

Lowest AQI recorded in

September

18AQI

202030AQI

13
21
18
22
8
28
3
31
30
3
13
29
2
208
13

Highest AQI recorded in

June

41AQI

Lowest AQI recorded in

September

19AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2025(Avg.)
30AQI
Least Polluted Year Recorded
2022(Avg.)
22AQI

Portland's annual 2025 AQI (30) shows an average percentage change of 21.09% (worsened AQI) compared to previous years: 2020 (30), 2021 (23), 2022 (22), 2023 (26), 2024 (24).