Longueuil, Quebec, Canada 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
Longueuil, Quebec, Canada
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
5th Aug 2021
73AQILowest AQI recorded on
9th Aug 2024
15AQISame Day Analysis (4th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 65 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 4th Aug - 5th Aug 2025
Longueuil, Quebec, Canada
AQI
Day
Night
.
5 AM4th Aug 2025
8 PM
4 AM5th Aug 2025
Day time
Avg. Highest Time
2PM4th Aug
125AQI
Avg. Lowest Time
5AM4th Aug
57AQI
Night time
Avg. Highest Time
10PM4th Aug
76AQI
Avg. Lowest Time
4AM5th Aug
47AQI
In the last 24 hours,
Longueuil's AQI reached its highest point of 125 at 2 PM during the Day, while the lowest point, 47, was recorded at 4 AM during the Night between 4th Aug and 5th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Longueuil, Quebec, Canada
JulAug
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 Jul 2025395 AMAQI
6th Jul 2025446 AMAQI
6th Jul 2025477 AMAQI
6th Jul 2025478 AMAQI
6th Jul 2025459 AMAQI
6th Jul 20254410 AMAQI
6th Jul 20254411 AMAQI
6th Jul 20254412 PMAQI
6th Jul 2025441 PMAQI
6th Jul 2025442 PMAQI
6th Jul 2025443 PMAQI
6th Jul 2025434 PMAQI
6th Jul 2025375 PMAQI
6th Jul 2025386 PMAQI
6th Jul 2025397 PMAQI
6th Jul 2025408 PMAQI
6th Jul 2025419 PMAQI
6th Jul 20254310 PMAQI
6th Jul 20254211 PMAQI
7th Jul 20254412 AMAQI
7th Jul 2025431 AMAQI
7th Jul 2025412 AMAQI
7th Jul 2025433 AMAQI
7th Jul 2025474 AMAQI
27°C20/37°C
7th Jul 2025435 AMAQI
7th Jul 2025416 AMAQI
7th Jul 2025357 AMAQI
7th Jul 2025388 AMAQI
7th Jul 2025469 AMAQI
7th Jul 20255010 AMAQI
7th Jul 20255011 AMAQI
7th Jul 20255112 PMAQI
7th Jul 2025511 PMAQI
7th Jul 2025522 PMAQI
7th Jul 2025523 PMAQI
7th Jul 2025494 PMAQI
7th Jul 2025445 PMAQI
7th Jul 2025406 PMAQI
7th Jul 2025367 PMAQI
7th Jul 2025358 PMAQI
7th Jul 2025419 PMAQI
7th Jul 20253910 PMAQI
7th Jul 20253311 PMAQI
8th Jul 20253512 AMAQI
8th Jul 2025371 AMAQI
8th Jul 2025362 AMAQI
8th Jul 2025303 AMAQI
8th Jul 2025274 AMAQI
18°C15/23°C
8th Jul 2025255 AMAQI
8th Jul 2025256 AMAQI
8th Jul 2025267 AMAQI
8th Jul 2025288 AMAQI
8th Jul 2025289 AMAQI
8th Jul 20252710 AMAQI
8th Jul 20253011 AMAQI
8th Jul 20253012 PMAQI
8th Jul 2025321 PMAQI
8th Jul 2025352 PMAQI
8th Jul 2025383 PMAQI
8th Jul 2025374 PMAQI
8th Jul 2025345 PMAQI
8th Jul 2025346 PMAQI
8th Jul 2025327 PMAQI
8th Jul 2025328 PMAQI
8th Jul 2025309 PMAQI
8th Jul 20253010 PMAQI
8th Jul 20253011 PMAQI
9th Jul 20253112 AMAQI
9th Jul 2025321 AMAQI
9th Jul 2025332 AMAQI
9th Jul 2025373 AMAQI
9th Jul 2025414 AMAQI
22°C16/30°C
9th Jul 2025445 AMAQI
9th Jul 2025466 AMAQI
9th Jul 2025487 AMAQI
9th Jul 2025488 AMAQI
9th Jul 2025479 AMAQI
9th Jul 20254610 AMAQI
9th Jul 20255011 AMAQI
9th Jul 20254712 PMAQI
9th Jul 2025471 PMAQI
9th Jul 2025442 PMAQI
9th Jul 2025463 PMAQI
9th Jul 2025454 PMAQI
9th Jul 2025445 PMAQI
9th Jul 2025446 PMAQI
9th Jul 2025437 PMAQI
9th Jul 2025438 PMAQI
9th Jul 2025439 PMAQI
9th Jul 20254310 PMAQI
9th Jul 20254111 PMAQI
10th Jul 20254012 AMAQI
10th Jul 2025431 AMAQI
10th Jul 2025432 AMAQI
10th Jul 2025473 AMAQI
10th Jul 2025484 AMAQI
23°C16/31°C
10th Jul 2025495 AMAQI
10th Jul 2025506 AMAQI
10th Jul 2025507 AMAQI
10th Jul 2025508 AMAQI
10th Jul 2025479 AMAQI
10th Jul 20254910 AMAQI
10th Jul 20254911 AMAQI
10th Jul 20255012 PMAQI
10th Jul 2025491 PMAQI
10th Jul 2025482 PMAQI
10th Jul 2025473 PMAQI
10th Jul 2025474 PMAQI
10th Jul 2025475 PMAQI
10th Jul 2025466 PMAQI
10th Jul 2025497 PMAQI
10th Jul 2025508 PMAQI
10th Jul 2025489 PMAQI
10th Jul 20254410 PMAQI
10th Jul 20254511 PMAQI
11th Jul 20254312 AMAQI
11th Jul 2025441 AMAQI
11th Jul 2025462 AMAQI
11th Jul 2025483 AMAQI
11th Jul 2025514 AMAQI
24°C18/30°C
11th Jul 2025515 AMAQI
11th Jul 2025516 AMAQI
11th Jul 2025527 AMAQI
11th Jul 2025508 AMAQI
11th Jul 2025509 AMAQI
11th Jul 20255010 AMAQI
11th Jul 20255211 AMAQI
11th Jul 20255212 PMAQI
11th Jul 2025521 PMAQI
11th Jul 2025532 PMAQI
11th Jul 2025523 PMAQI
11th Jul 2025534 PMAQI
11th Jul 2025515 PMAQI
11th Jul 2025516 PMAQI
11th Jul 2025507 PMAQI
11th Jul 2025518 PMAQI
11th Jul 2025479 PMAQI
11th Jul 20254610 PMAQI
11th Jul 20254711 PMAQI
12th Jul 20254812 AMAQI
12th Jul 2025481 AMAQI
12th Jul 2025492 AMAQI
12th Jul 2025523 AMAQI
12th Jul 2025544 AMAQI
25°C18/32°C
12th Jul 2025535 AMAQI
12th Jul 2025506 AMAQI
12th Jul 2025507 AMAQI
12th Jul 2025528 AMAQI
12th Jul 2025539 AMAQI
12th Jul 20255210 AMAQI
12th Jul 20255311 AMAQI
12th Jul 20255512 PMAQI
12th Jul 2025541 PMAQI
12th Jul 2025552 PMAQI
12th Jul 2025553 PMAQI
12th Jul 2025544 PMAQI
12th Jul 2025535 PMAQI
12th Jul 2025536 PMAQI
12th Jul 2025537 PMAQI
12th Jul 2025538 PMAQI
12th Jul 2025529 PMAQI
12th Jul 20255210 PMAQI
12th Jul 20255211 PMAQI
13th Jul 20255212 AMAQI
13th Jul 2025521 AMAQI
13th Jul 2025512 AMAQI
13th Jul 2025453 AMAQI
13th Jul 2025424 AMAQI
26°C19/34°C
13th Jul 2025405 AMAQI
13th Jul 2025396 AMAQI
13th Jul 2025387 AMAQI
13th Jul 2025398 AMAQI
13th Jul 2025439 AMAQI
13th Jul 20254110 AMAQI
13th Jul 20254211 AMAQI
13th Jul 20254212 PMAQI
13th Jul 2025391 PMAQI
13th Jul 2025382 PMAQI
13th Jul 2025403 PMAQI
13th Jul 2025414 PMAQI
13th Jul 2025435 PMAQI
13th Jul 2025426 PMAQI
13th Jul 2025417 PMAQI
13th Jul 2025418 PMAQI
13th Jul 2025429 PMAQI
13th Jul 20254110 PMAQI
13th Jul 20254011 PMAQI
14th Jul 20254112 AMAQI
14th Jul 2025431 AMAQI
14th Jul 2025412 AMAQI
14th Jul 2025383 AMAQI
14th Jul 2025364 AMAQI
26°C23/31°C
14th Jul 2025345 AMAQI
14th Jul 2025346 AMAQI
14th Jul 2025337 AMAQI
14th Jul 2025348 AMAQI
14th Jul 2025359 AMAQI
14th Jul 20253610 AMAQI
14th Jul 20254111 AMAQI
14th Jul 20254812 PMAQI
14th Jul 2025481 PMAQI
14th Jul 2025482 PMAQI
14th Jul 2025433 PMAQI
14th Jul 2025414 PMAQI
14th Jul 2025405 PMAQI
14th Jul 2025416 PMAQI
14th Jul 2025407 PMAQI
14th Jul 2025418 PMAQI
14th Jul 2025409 PMAQI
14th Jul 20254110 PMAQI
14th Jul 20253711 PMAQI
15th Jul 20253812 AMAQI
15th Jul 2025401 AMAQI
15th Jul 2025382 AMAQI
15th Jul 2025343 AMAQI
15th Jul 2025284 AMAQI
26°C22/34°C
15th Jul 2025335 AMAQI
15th Jul 2025346 AMAQI
15th Jul 2025417 AMAQI
15th Jul 2025408 AMAQI
15th Jul 2025439 AMAQI
15th Jul 20254310 AMAQI
15th Jul 20254211 AMAQI
15th Jul 20254212 PMAQI
15th Jul 2025441 PMAQI
15th Jul 2025442 PMAQI
15th Jul 2025463 PMAQI
15th Jul 2025444 PMAQI
15th Jul 2025415 PMAQI
15th Jul 2025416 PMAQI
15th Jul 2025417 PMAQI
15th Jul 2025418 PMAQI
15th Jul 2025409 PMAQI
15th Jul 20253910 PMAQI
15th Jul 20254011 PMAQI
16th Jul 20254012 AMAQI
16th Jul 2025391 AMAQI
16th Jul 2025402 AMAQI
16th Jul 2025413 AMAQI
16th Jul 2025514 AMAQI
26°C19/34°C
16th Jul 2025525 AMAQI
16th Jul 2025516 AMAQI
16th Jul 2025527 AMAQI
16th Jul 2025548 AMAQI
16th Jul 2025519 AMAQI
16th Jul 20255210 AMAQI
16th Jul 20255111 AMAQI
16th Jul 20255012 PMAQI
16th Jul 2025511 PMAQI
16th Jul 2025502 PMAQI
16th Jul 2025513 PMAQI
16th Jul 2025504 PMAQI
16th Jul 2025515 PMAQI
16th Jul 2025506 PMAQI
16th Jul 2025497 PMAQI
16th Jul 2025508 PMAQI
16th Jul 2025499 PMAQI
16th Jul 20254910 PMAQI
16th Jul 20254911 PMAQI
17th Jul 20254912 AMAQI
17th Jul 2025491 AMAQI
17th Jul 2025492 AMAQI
17th Jul 2025533 AMAQI
17th Jul 2025564 AMAQI
28°C21/35°C
17th Jul 2025555 AMAQI
17th Jul 2025516 AMAQI
17th Jul 2025487 AMAQI
17th Jul 2025488 AMAQI
17th Jul 2025499 AMAQI
17th Jul 20254910 AMAQI
17th Jul 20254711 AMAQI
17th Jul 20254512 PMAQI
17th Jul 2025451 PMAQI
17th Jul 2025422 PMAQI
17th Jul 2025413 PMAQI
17th Jul 2025444 PMAQI
17th Jul 2025465 PMAQI
17th Jul 2025466 PMAQI
17th Jul 2025447 PMAQI
17th Jul 2025428 PMAQI
17th Jul 2025489 PMAQI
17th Jul 20254610 PMAQI
17th Jul 20253711 PMAQI
18th Jul 20253712 AMAQI
18th Jul 2025361 AMAQI
18th Jul 2025342 AMAQI
18th Jul 2025223 AMAQI
18th Jul 2025164 AMAQI
27°C18/31°C
18th Jul 2025155 AMAQI
18th Jul 2025146 AMAQI
18th Jul 2025157 AMAQI
18th Jul 2025168 AMAQI
18th Jul 2025179 AMAQI
18th Jul 20251910 AMAQI
18th Jul 20252011 AMAQI
18th Jul 20252012 PMAQI
18th Jul 2025201 PMAQI
18th Jul 2025212 PMAQI
18th Jul 2025223 PMAQI
18th Jul 2025224 PMAQI
18th Jul 2025235 PMAQI
18th Jul 2025246 PMAQI
18th Jul 2025247 PMAQI
18th Jul 2025268 PMAQI
18th Jul 2025239 PMAQI
18th Jul 20252310 PMAQI
18th Jul 20252811 PMAQI
19th Jul 20252812 AMAQI
19th Jul 2025281 AMAQI
19th Jul 2025282 AMAQI
19th Jul 2025293 AMAQI
19th Jul 2025304 AMAQI
20°C14/28°C
19th Jul 2025295 AMAQI
19th Jul 2025296 AMAQI
19th Jul 2025277 AMAQI
19th Jul 2025278 AMAQI
19th Jul 2025279 AMAQI
19th Jul 20252610 AMAQI
19th Jul 20252611 AMAQI
19th Jul 20252812 PMAQI
19th Jul 2025301 PMAQI
19th Jul 2025342 PMAQI
19th Jul 2025383 PMAQI
19th Jul 2025384 PMAQI
19th Jul 2025385 PMAQI
19th Jul 2025406 PMAQI
19th Jul 2025417 PMAQI
19th Jul 2025398 PMAQI
19th Jul 2025349 PMAQI
19th Jul 20253210 PMAQI
19th Jul 20254011 PMAQI
20th Jul 20253812 AMAQI
20th Jul 2025381 AMAQI
20th Jul 2025392 AMAQI
20th Jul 2025433 AMAQI
20th Jul 2025474 AMAQI
22°C15/30°C
20th Jul 2025475 AMAQI
20th Jul 2025476 AMAQI
20th Jul 2025427 AMAQI
20th Jul 2025408 AMAQI
20th Jul 2025389 AMAQI
20th Jul 20253610 AMAQI
20th Jul 20253411 AMAQI
20th Jul 20253312 PMAQI
20th Jul 2025321 PMAQI
20th Jul 2025322 PMAQI
20th Jul 2025323 PMAQI
20th Jul 2025324 PMAQI
20th Jul 2025345 PMAQI
20th Jul 2025356 PMAQI
20th Jul 2025367 PMAQI
20th Jul 2025368 PMAQI
20th Jul 2025389 PMAQI
20th Jul 20253910 PMAQI
20th Jul 20254211 PMAQI
21st Jul 20254012 AMAQI
21st Jul 2025381 AMAQI
21st Jul 2025382 AMAQI
21st Jul 2025493 AMAQI
21st Jul 2025534 AMAQI
21°C17/29°C
21st Jul 2025445 AMAQI
21st Jul 2025356 AMAQI
21st Jul 2025307 AMAQI
21st Jul 2025308 AMAQI
21st Jul 2025309 AMAQI
21st Jul 20252710 AMAQI
21st Jul 20252611 AMAQI
21st Jul 20252612 PMAQI
21st Jul 2025241 PMAQI
21st Jul 2025222 PMAQI
21st Jul 2025213 PMAQI
21st Jul 2025244 PMAQI
21st Jul 2025265 PMAQI
21st Jul 2025266 PMAQI
21st Jul 2025267 PMAQI
21st Jul 2025258 PMAQI
21st Jul 2025269 PMAQI
21st Jul 20252410 PMAQI
21st Jul 20252411 PMAQI
22nd Jul 20252412 AMAQI
22nd Jul 2025231 AMAQI
22nd Jul 2025232 AMAQI
22nd Jul 2025193 AMAQI
22nd Jul 2025174 AMAQI
19°C14/24°C
22nd Jul 2025185 AMAQI
22nd Jul 2025176 AMAQI
22nd Jul 2025187 AMAQI
22nd Jul 2025188 AMAQI
22nd Jul 2025189 AMAQI
22nd Jul 20251910 AMAQI
22nd Jul 20251911 AMAQI
22nd Jul 20251812 PMAQI
22nd Jul 2025181 PMAQI
22nd Jul 2025182 PMAQI
22nd Jul 2025193 PMAQI
22nd Jul 2025194 PMAQI
22nd Jul 2025205 PMAQI
22nd Jul 2025206 PMAQI
22nd Jul 2025197 PMAQI
22nd Jul 2025198 PMAQI
22nd Jul 2025199 PMAQI
22nd Jul 20251910 PMAQI
22nd Jul 20252011 PMAQI
23rd Jul 20252012 AMAQI
23rd Jul 2025211 AMAQI
23rd Jul 2025212 AMAQI
23rd Jul 2025213 AMAQI
23rd Jul 2025234 AMAQI
19°C11/24°C
23rd Jul 2025245 AMAQI
23rd Jul 2025256 AMAQI
23rd Jul 2025257 AMAQI
23rd Jul 2025268 AMAQI
23rd Jul 2025269 AMAQI
23rd Jul 20252810 AMAQI
23rd Jul 20252911 AMAQI
23rd Jul 20252912 PMAQI
23rd Jul 2025261 PMAQI
23rd Jul 2025252 PMAQI
23rd Jul 2025243 PMAQI
23rd Jul 2025234 PMAQI
23rd Jul 2025235 PMAQI
23rd Jul 2025236 PMAQI
23rd Jul 2025237 PMAQI
23rd Jul 2025238 PMAQI
23rd Jul 2025239 PMAQI
23rd Jul 20252310 PMAQI
23rd Jul 20252511 PMAQI
24th Jul 20252312 AMAQI
24th Jul 2025251 AMAQI
24th Jul 2025252 AMAQI
24th Jul 2025273 AMAQI
24th Jul 2025274 AMAQI
21°C12/29°C
24th Jul 2025265 AMAQI
24th Jul 2025276 AMAQI
24th Jul 2025267 AMAQI
24th Jul 2025258 AMAQI
24th Jul 2025289 AMAQI
24th Jul 20253010 AMAQI
24th Jul 20253411 AMAQI
24th Jul 20253912 PMAQI
24th Jul 2025431 PMAQI
24th Jul 2025432 PMAQI
24th Jul 2025443 PMAQI
24th Jul 2025394 PMAQI
24th Jul 2025355 PMAQI
24th Jul 2025346 PMAQI
24th Jul 2025357 PMAQI
24th Jul 2025368 PMAQI
24th Jul 2025359 PMAQI
24th Jul 20253510 PMAQI
24th Jul 20253711 PMAQI
25th Jul 20253312 AMAQI
25th Jul 2025311 AMAQI
25th Jul 2025332 AMAQI
25th Jul 2025423 AMAQI
25th Jul 2025474 AMAQI
26°C17/35°C
25th Jul 2025385 AMAQI
25th Jul 2025346 AMAQI
25th Jul 2025347 AMAQI
25th Jul 2025348 AMAQI
25th Jul 2025349 AMAQI
25th Jul 20253310 AMAQI
25th Jul 20253211 AMAQI
25th Jul 20253212 PMAQI
25th Jul 2025341 PMAQI
25th Jul 2025392 PMAQI
25th Jul 2025453 PMAQI
25th Jul 2025444 PMAQI
25th Jul 2025385 PMAQI
25th Jul 2025386 PMAQI
25th Jul 2025367 PMAQI
25th Jul 2025378 PMAQI
25th Jul 2025429 PMAQI
25th Jul 20254110 PMAQI
25th Jul 20253611 PMAQI
26th Jul 20253612 AMAQI
26th Jul 2025371 AMAQI
26th Jul 2025372 AMAQI
26th Jul 2025513 AMAQI
26th Jul 2025454 AMAQI
26°C23/31°C
26th Jul 2025455 AMAQI
26th Jul 2025536 AMAQI
26th Jul 2025587 AMAQI
26th Jul 2025548 AMAQI
26th Jul 2025499 AMAQI
26th Jul 20255410 AMAQI
26th Jul 20255111 AMAQI
26th Jul 20255212 PMAQI
26th Jul 2025521 PMAQI
26th Jul 2025512 PMAQI
26th Jul 2025493 PMAQI
26th Jul 2025504 PMAQI
26th Jul 2025515 PMAQI
26th Jul 2025516 PMAQI
26th Jul 2025517 PMAQI
26th Jul 2025518 PMAQI
26th Jul 2025519 PMAQI
26th Jul 20255110 PMAQI
26th Jul 20255011 PMAQI
27th Jul 20255112 AMAQI
27th Jul 2025511 AMAQI
27th Jul 2025522 AMAQI
27th Jul 2025503 AMAQI
27th Jul 2025614 AMAQI
24°C15/33°C
27th Jul 2025575 AMAQI
27th Jul 2025576 AMAQI
27th Jul 2025577 AMAQI
27th Jul 2025558 AMAQI
27th Jul 2025589 AMAQI
27th Jul 20255610 AMAQI
27th Jul 20255711 AMAQI
27th Jul 20255612 PMAQI
27th Jul 2025561 PMAQI
27th Jul 2025562 PMAQI
27th Jul 2025563 PMAQI
27th Jul 2025564 PMAQI
27th Jul 2025575 PMAQI
27th Jul 2025576 PMAQI
27th Jul 2025577 PMAQI
27th Jul 2025578 PMAQI
27th Jul 2025559 PMAQI
27th Jul 20255610 PMAQI
27th Jul 20255611 PMAQI
28th Jul 20255512 AMAQI
28th Jul 2025551 AMAQI
28th Jul 2025562 AMAQI
28th Jul 2025543 AMAQI
28th Jul 2025554 AMAQI
24°C18/31°C
28th Jul 2025575 AMAQI
28th Jul 2025606 AMAQI
28th Jul 2025607 AMAQI
28th Jul 2025608 AMAQI
28th Jul 2025599 AMAQI
28th Jul 20256010 AMAQI
28th Jul 20255911 AMAQI
28th Jul 20255912 PMAQI
28th Jul 2025601 PMAQI
28th Jul 2025612 PMAQI
28th Jul 2025593 PMAQI
28th Jul 2025574 PMAQI
28th Jul 2025575 PMAQI
28th Jul 2025576 PMAQI
28th Jul 2025587 PMAQI
28th Jul 2025578 PMAQI
28th Jul 2025599 PMAQI
28th Jul 20255910 PMAQI
28th Jul 20255711 PMAQI
29th Jul 20255812 AMAQI
29th Jul 2025581 AMAQI
29th Jul 2025582 AMAQI
29th Jul 2025593 AMAQI
29th Jul 2025584 AMAQI
27°C20/33°C
29th Jul 2025585 AMAQI
29th Jul 2025576 AMAQI
29th Jul 2025567 AMAQI
29th Jul 2025578 AMAQI
29th Jul 2025569 AMAQI
29th Jul 20255410 AMAQI
29th Jul 20255211 AMAQI
29th Jul 20254812 PMAQI
29th Jul 2025451 PMAQI
29th Jul 2025432 PMAQI
29th Jul 2025423 PMAQI
29th Jul 2025464 PMAQI
29th Jul 2025535 PMAQI
29th Jul 2025536 PMAQI
29th Jul 2025547 PMAQI
29th Jul 2025558 PMAQI
29th Jul 2025569 PMAQI
29th Jul 20255710 PMAQI
29th Jul 20255811 PMAQI
30th Jul 20255712 AMAQI
30th Jul 2025571 AMAQI
30th Jul 2025582 AMAQI
30th Jul 2025583 AMAQI
30th Jul 2025604 AMAQI
25°C21/29°C
30th Jul 2025625 AMAQI
30th Jul 2025616 AMAQI
30th Jul 2025617 AMAQI
30th Jul 2025628 AMAQI
30th Jul 2025649 AMAQI
30th Jul 20256310 AMAQI
30th Jul 20256311 AMAQI
30th Jul 20256312 PMAQI
30th Jul 2025641 PMAQI
30th Jul 2025642 PMAQI
30th Jul 2025653 PMAQI
30th Jul 2025664 PMAQI
30th Jul 2025665 PMAQI
30th Jul 2025666 PMAQI
30th Jul 2025667 PMAQI
30th Jul 2025668 PMAQI
30th Jul 2025669 PMAQI
30th Jul 20256610 PMAQI
30th Jul 20256111 PMAQI
31st Jul 20256012 AMAQI
31st Jul 2025611 AMAQI
31st Jul 2025602 AMAQI
31st Jul 2025613 AMAQI
31st Jul 2025604 AMAQI
24°C19/29°C
31st Jul 2025675 AMAQI
31st Jul 2025626 AMAQI
31st Jul 2025567 AMAQI
31st Jul 2025498 AMAQI
31st Jul 2025479 AMAQI
31st Jul 20254310 AMAQI
31st Jul 20254011 AMAQI
31st Jul 20253412 PMAQI
31st Jul 2025341 PMAQI
31st Jul 2025332 PMAQI
31st Jul 2025353 PMAQI
31st Jul 2025354 PMAQI
31st Jul 2025335 PMAQI
31st Jul 2025336 PMAQI
31st Jul 2025337 PMAQI
31st Jul 2025338 PMAQI
31st Jul 2025449 PMAQI
31st Jul 20253910 PMAQI
31st Jul 20253211 PMAQI
1st Aug 20253212 AMAQI
1st Aug 2025341 AMAQI
1st Aug 2025322 AMAQI
1st Aug 2025333 AMAQI
1st Aug 2025314 AMAQI
19°C15/24°C
1st Aug 2025295 AMAQI
1st Aug 2025266 AMAQI
1st Aug 2025237 AMAQI
1st Aug 2025208 AMAQI
1st Aug 2025199 AMAQI
1st Aug 20251910 AMAQI
1st Aug 20251911 AMAQI
1st Aug 20251812 PMAQI
1st Aug 2025181 PMAQI
1st Aug 2025182 PMAQI
1st Aug 2025173 PMAQI
1st Aug 2025164 PMAQI
1st Aug 2025175 PMAQI
1st Aug 2025176 PMAQI
1st Aug 2025177 PMAQI
1st Aug 2025168 PMAQI
1st Aug 2025199 PMAQI
1st Aug 20252110 PMAQI
1st Aug 20252211 PMAQI
2nd Aug 20252312 AMAQI
2nd Aug 2025251 AMAQI
2nd Aug 2025272 AMAQI
2nd Aug 2025293 AMAQI
2nd Aug 2025284 AMAQI
18°C10/26°C
2nd Aug 2025295 AMAQI
2nd Aug 2025276 AMAQI
2nd Aug 2025277 AMAQI
2nd Aug 2025248 AMAQI
2nd Aug 2025239 AMAQI
2nd Aug 20252210 AMAQI
2nd Aug 20252211 AMAQI
2nd Aug 20252112 PMAQI
2nd Aug 2025211 PMAQI
2nd Aug 2025262 PMAQI
2nd Aug 2025303 PMAQI
2nd Aug 2025384 PMAQI
2nd Aug 2025555 PMAQI
2nd Aug 2025606 PMAQI
2nd Aug 2025507 PMAQI
2nd Aug 2025308 PMAQI
2nd Aug 2025309 PMAQI
2nd Aug 20253210 PMAQI
2nd Aug 20253811 PMAQI
3rd Aug 20254312 AMAQI
3rd Aug 2025411 AMAQI
3rd Aug 2025452 AMAQI
3rd Aug 2025523 AMAQI
3rd Aug 2025454 AMAQI
21°C12/30°C
3rd Aug 2025445 AMAQI
3rd Aug 2025476 AMAQI
3rd Aug 2025457 AMAQI
3rd Aug 2025418 AMAQI
3rd Aug 2025379 AMAQI
3rd Aug 20254610 AMAQI
3rd Aug 20255711 AMAQI
3rd Aug 20256312 PMAQI
3rd Aug 2025701 PMAQI
3rd Aug 2025702 PMAQI
3rd Aug 2025683 PMAQI
3rd Aug 2025674 PMAQI
3rd Aug 2025705 PMAQI
3rd Aug 2025696 PMAQI
3rd Aug 2025657 PMAQI
3rd Aug 2025668 PMAQI
3rd Aug 2025559 PMAQI
3rd Aug 20256310 PMAQI
3rd Aug 20256011 PMAQI
4th Aug 20255812 AMAQI
4th Aug 2025581 AMAQI
4th Aug 2025582 AMAQI
4th Aug 2025573 AMAQI
4th Aug 2025514 AMAQI
24°C15/33°C
4th Aug 2025575 AMAQI
4th Aug 2025616 AMAQI
4th Aug 2025637 AMAQI
4th Aug 2025658 AMAQI
4th Aug 2025679 AMAQI
4th Aug 20257610 AMAQI
4th Aug 20257911 AMAQI
4th Aug 20258112 PMAQI
4th Aug 20251041 PMAQI
4th Aug 20251252 PMAQI
4th Aug 20251173 PMAQI
4th Aug 20251074 PMAQI
4th Aug 2025965 PMAQI
4th Aug 2025906 PMAQI
4th Aug 2025897 PMAQI
4th Aug 2025858 PMAQI
4th Aug 2025729 PMAQI
4th Aug 20257610 PMAQI
4th Aug 20257611 PMAQI
5th Aug 20257312 AMAQI
5th Aug 2025661 AMAQI
5th Aug 2025592 AMAQI
5th Aug 2025523 AMAQI
5th Aug 2025474 AMAQI
22°C17/27°C
5th Aug 2025445 AMAQI
5 AM5th Aug 2025396 AMAQI
12 PM
8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 8 PM
43AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM
43AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 43), while the lowest AQI was between 5 AM to 8 PM (Avg. 43).
Night time
Avg. Highest Time
12 AM - 11 PM
42AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
42AQI
8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 42), while the lowest AQI was between 12 AM to 11 PM (Avg. 42).
2025 Days Vs Air Quality
Longueuil, Quebec, Canada
2025
89%
193
11%
23
Total number of days with different AQI categories in last 217 days in 2025 (148 days remaining)
Good
193 DaysModerate
23 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 217 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
Longueuil, Quebec, Canada
AQI levels in 2025
AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
1st January 2025
32AQI
32AQI
2nd January 2025
23AQI
23AQI
3rd January 2025
20AQI
20AQI
4th January 2025
20AQI
20AQI
5th January 2025
22AQI
22AQI
6th January 2025
25AQI
25AQI
7th January 2025
21AQI
21AQI
8th January 2025
21AQI
21AQI
9th January 2025
20AQI
20AQI
10th January 2025
21AQI
21AQI
11th January 2025
38AQI
38AQI
12th January 2025
35AQI
35AQI
13th January 2025
58AQI
58AQI
14th January 2025
33AQI
33AQI
15th January 2025
23AQI
23AQI
16th January 2025
30AQI
30AQI
17th January 2025
60AQI
60AQI
18th January 2025
45AQI
45AQI
19th January 2025
26AQI
26AQI
20th January 2025
24AQI
24AQI
21st January 2025
37AQI
37AQI
22nd January 2025
48AQI
48AQI
23rd January 2025
43AQI
43AQI
24th January 2025
46AQI
46AQI
25th January 2025
52AQI
52AQI
26th January 2025
39AQI
39AQI
27th January 2025
26AQI
26AQI
28th January 2025
25AQI
25AQI
29th January 2025
29AQI
29AQI
30th January 2025
25AQI
25AQI
31st January 2025
43AQI
43AQI
1st February 2025
25AQI
25AQI
2nd February 2025
38AQI
38AQI
3rd February 2025
55AQI
55AQI
4th February 2025
29AQI
29AQI
5th February 2025
23AQI
23AQI
6th February 2025
35AQI
35AQI
7th February 2025
35AQI
35AQI
8th February 2025
28AQI
28AQI
9th February 2025
37AQI
37AQI
10th February 2025
26AQI
26AQI
11th February 2025
28AQI
28AQI
12th February 2025
30AQI
30AQI
13th February 2025
27AQI
27AQI
14th February 2025
21AQI
21AQI
15th February 2025
23AQI
23AQI
16th February 2025
23AQI
23AQI
17th February 2025
21AQI
21AQI
18th February 2025
22AQI
22AQI
19th February 2025
21AQI
21AQI
20th February 2025
26AQI
26AQI
21st February 2025
20AQI
20AQI
22nd February 2025
26AQI
26AQI
23rd February 2025
50AQI
50AQI
24th February 2025
48AQI
48AQI
25th February 2025
58AQI
58AQI
26th February 2025
46AQI
46AQI
27th February 2025
45AQI
45AQI
28th February 2025
32AQI
32AQI
1st March 2025
30AQI
30AQI
2nd March 2025
24AQI
24AQI
3rd March 2025
37AQI
37AQI
4th March 2025
37AQI
37AQI
5th March 2025
57AQI
57AQI
6th March 2025
21AQI
21AQI
7th March 2025
21AQI
21AQI
8th March 2025
24AQI
24AQI
9th March 2025
25AQI
25AQI
10th March 2025
30AQI
30AQI
11th March 2025
46AQI
46AQI
12th March 2025
23AQI
23AQI
13th March 2025
43AQI
43AQI
14th March 2025
79AQI
79AQI
15th March 2025
62AQI
62AQI
16th March 2025
55AQI
55AQI
17th March 2025
33AQI
33AQI
18th March 2025
34AQI
34AQI
19th March 2025
39AQI
39AQI
20th March 2025
27AQI
27AQI
21st March 2025
21AQI
21AQI
22nd March 2025
24AQI
24AQI
23rd March 2025
20AQI
20AQI
24th March 2025
24AQI
24AQI
25th March 2025
25AQI
25AQI
26th March 2025
22AQI
22AQI
27th March 2025
20AQI
20AQI
28th March 2025
22AQI
22AQI
29th March 2025
21AQI
21AQI
30th March 2025
25AQI
25AQI
31st March 2025
32AQI
32AQI
1st April 2025
18AQI
18AQI
2nd April 2025
20AQI
20AQI
3rd April 2025
21AQI
21AQI
4th April 2025
19AQI
19AQI
5th April 2025
20AQI
20AQI
6th April 2025
18AQI
18AQI
7th April 2025
20AQI
20AQI
8th April 2025
21AQI
21AQI
9th April 2025
18AQI
18AQI
10th April 2025
26AQI
26AQI
11th April 2025
32AQI
32AQI
12th April 2025
41AQI
41AQI
13th April 2025
26AQI
26AQI
14th April 2025
33AQI
33AQI
15th April 2025
29AQI
29AQI
16th April 2025
15AQI
15AQI
17th April 2025
17AQI
17AQI
18th April 2025
26AQI
26AQI
19th April 2025
44AQI
44AQI
20th April 2025
16AQI
16AQI
21st April 2025
22AQI
22AQI
22nd April 2025
22AQI
22AQI
23rd April 2025
16AQI
16AQI
24th April 2025
25AQI
25AQI
25th April 2025
24AQI
24AQI
26th April 2025
24AQI
24AQI
27th April 2025
14AQI
14AQI
28th April 2025
23AQI
23AQI
29th April 2025
31AQI
31AQI
30th April 2025
17AQI
17AQI
1st May 2025
18AQI
18AQI
2nd May 2025
25AQI
25AQI
3rd May 2025
16AQI
16AQI
4th May 2025
29AQI
29AQI
5th May 2025
22AQI
22AQI
6th May 2025
22AQI
22AQI
7th May 2025
17AQI
17AQI
8th May 2025
16AQI
16AQI
9th May 2025
18AQI
18AQI
10th May 2025
24AQI
24AQI
11th May 2025
16AQI
16AQI
12th May 2025
23AQI
23AQI
13th May 2025
34AQI
34AQI
14th May 2025
38AQI
38AQI
15th May 2025
30AQI
30AQI
16th May 2025
43AQI
43AQI
17th May 2025
41AQI
41AQI
18th May 2025
22AQI
22AQI
19th May 2025
15AQI
15AQI
20th May 2025
15AQI
15AQI
21st May 2025
21AQI
21AQI
22nd May 2025
17AQI
17AQI
23rd May 2025
17AQI
17AQI
24th May 2025
14AQI
14AQI
25th May 2025
17AQI
17AQI
26th May 2025
24AQI
24AQI
27th May 2025
27AQI
27AQI
28th May 2025
33AQI
33AQI
29th May 2025
33AQI
33AQI
30th May 2025
26AQI
26AQI
31st May 2025
31AQI
31AQI
1st June 2025
16AQI
16AQI
2nd June 2025
18AQI
18AQI
3rd June 2025
25AQI
25AQI
4th June 2025
41AQI
41AQI
5th June 2025
42AQI
42AQI
6th June 2025
53AQI
53AQI
7th June 2025
58AQI
58AQI
8th June 2025
57AQI
57AQI
9th June 2025
59AQI
59AQI
10th June 2025
43AQI
43AQI
11th June 2025
51AQI
51AQI
12th June 2025
56AQI
56AQI
13th June 2025
28AQI
28AQI
14th June 2025
28AQI
28AQI
15th June 2025
31AQI
31AQI
16th June 2025
44AQI
44AQI
17th June 2025
43AQI
43AQI
18th June 2025
26AQI
26AQI
19th June 2025
38AQI
38AQI
20th June 2025
22AQI
22AQI
21st June 2025
25AQI
25AQI
22nd June 2025
27AQI
27AQI
23rd June 2025
40AQI
40AQI
24th June 2025
51AQI
51AQI
25th June 2025
47AQI
47AQI
26th June 2025
30AQI
30AQI
27th June 2025
30AQI
30AQI
28th June 2025
27AQI
27AQI
29th June 2025
30AQI
30AQI
30th June 2025
30AQI
30AQI
1st July 2025
34AQI
34AQI
2nd July 2025
30AQI
30AQI
3rd July 2025
38AQI
38AQI
4th July 2025
24AQI
24AQI
5th July 2025
27AQI
27AQI
6th July 2025
40AQI
40AQI
7th July 2025
43AQI
43AQI
8th July 2025
31AQI
31AQI
9th July 2025
42AQI
42AQI
10th July 2025
47AQI
47AQI
11th July 2025
49AQI
49AQI
12th July 2025
52AQI
52AQI
13th July 2025
43AQI
43AQI
14th July 2025
40AQI
40AQI
15th July 2025
39AQI
39AQI
16th July 2025
48AQI
48AQI
17th July 2025
47AQI
47AQI
18th July 2025
23AQI
23AQI
19th July 2025
32AQI
32AQI
20th July 2025
38AQI
38AQI
21st July 2025
31AQI
31AQI
22nd July 2025
19AQI
19AQI
23rd July 2025
24AQI
24AQI
24th July 2025
32AQI
32AQI
25th July 2025
37AQI
37AQI
26th July 2025
49AQI
49AQI
27th July 2025
56AQI
56AQI
28th July 2025
58AQI
58AQI
29th July 2025
54AQI
54AQI
30th July 2025
62AQI
62AQI
31st July 2025
46AQI
46AQI
1st August 2025
23AQI
23AQI
2nd August 2025
32AQI
32AQI
3rd August 2025
55AQI
55AQI
4th August 2025
65AQI
65AQI
33AQI
32AQI
32AQI
23AQI
24AQI
37AQI
40AQI
44AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202532AQI
28
3
26
2
27
4
30
31
23
7
26
5
2
2
193
23
Highest AQI recorded in
August44AQI
Lowest AQI recorded in
April23AQI
202431AQI
29
2
24
5
29
2
30
31
27
3
29
2
22
9
24
6
31
30
26
4
1
332
33
1
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
April24AQI
202336AQI
29
2
21
7
29
2
28
2
28
3
17
9
3
1
21
8
2
27
4
21
9
28
3
29
25
6
303
55
5
1
Highest AQI recorded in
June54AQI
Lowest AQI recorded in
November27AQI
202233AQI
19
12
19
4
28
3
29
1
29
2
29
1
23
1
4
30
29
2
28
2
27
4
294
32
Highest AQI recorded in
January45AQI
Lowest AQI recorded in
August23AQI
202132AQI
27
4
21
7
28
3
29
1
28
3
30
26
5
23
8
30
30
1
27
3
27
4
326
39
Highest AQI recorded in
August41AQI
Lowest AQI recorded in
September22AQI
202025AQI
12
1
20
21
30
31
31
30
31
25
5
29
2
260
8
Highest AQI recorded in
November34AQI
Lowest AQI recorded in
October21AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
36AQILeast Polluted Year Recorded
2020(Avg.)
25AQILongueuil's annual 2025 AQI (32) shows an average percentage change of 3.2% (worsened AQI) compared to previous years: 2020 (25), 2021 (32), 2022 (33), 2023 (36), 2024 (31).
