Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

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+

July Air Quality Analysis

Longueuil, Quebec, Canada

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
1st Jul 2023
124AQI
Lowest AQI recorded on
9th Jul 2022
16AQI

Same Day Analysis (28th July):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 51 of Moderate air quality, showing improvement over 2025 and 2023 on the same day.

Day & Night AQI Trend: 28th Jul - 29th Jul 2026

Longueuil, Quebec, Canada

AQI
Day
Night
.

5 AM28th Jul 2026

8 PM

4 AM29th Jul 2026

Day time
Avg. Highest Time
4PM28th Jul

54AQI

Avg. Lowest Time
5AM28th Jul

48AQI

Night time
Avg. Highest Time
9PM28th Jul

52AQI

Avg. Lowest Time
4AM29th Jul

45AQI

In the last 24 hours,

Longueuil's AQI reached its highest point of 54 at 4 PM during the Day, while the lowest point, 45, was recorded at 4 AM during the Night between 28th Jul and 29th Jul 2026.

Day & Night AQI Trend : Jun - Jul 2026

Longueuil, Quebec, Canada

JunJul
30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th
Day
Night
30th Jun 2026245 AMAQI
30th Jun 2026246 AMAQI
30th Jun 2026247 AMAQI
30th Jun 2026258 AMAQI
30th Jun 2026269 AMAQI
30th Jun 20262710 AMAQI
30th Jun 20262811 AMAQI
30th Jun 20262712 PMAQI
30th Jun 2026281 PMAQI
30th Jun 2026262 PMAQI
30th Jun 2026273 PMAQI
30th Jun 2026274 PMAQI
30th Jun 2026275 PMAQI
30th Jun 2026276 PMAQI
30th Jun 2026287 PMAQI
30th Jun 2026278 PMAQI
30th Jun 2026289 PMAQI
30th Jun 20262310 PMAQI
30th Jun 20261911 PMAQI
1st Jul 20262112 AMAQI
1st Jul 2026241 AMAQI
1st Jul 2026232 AMAQI
1st Jul 2026273 AMAQI
1st Jul 2026264 AMAQI

24°C17/34°C

1st Jul 2026265 AMAQI
1st Jul 2026256 AMAQI
1st Jul 2026277 AMAQI
1st Jul 2026288 AMAQI
1st Jul 2026289 AMAQI
1st Jul 20262910 AMAQI
1st Jul 20262911 AMAQI
1st Jul 20262812 PMAQI
1st Jul 2026291 PMAQI
1st Jul 2026282 PMAQI
1st Jul 2026293 PMAQI
1st Jul 2026274 PMAQI
1st Jul 2026285 PMAQI
1st Jul 2026276 PMAQI
1st Jul 2026297 PMAQI
1st Jul 2026308 PMAQI
1st Jul 2026339 PMAQI
1st Jul 20262510 PMAQI
1st Jul 20262211 PMAQI
2nd Jul 20262012 AMAQI
2nd Jul 2026221 AMAQI
2nd Jul 2026232 AMAQI
2nd Jul 2026233 AMAQI
2nd Jul 2026264 AMAQI

27°C23/36°C

2nd Jul 2026245 AMAQI
2nd Jul 2026226 AMAQI
2nd Jul 2026177 AMAQI
2nd Jul 2026278 AMAQI
2nd Jul 2026279 AMAQI
2nd Jul 20262810 AMAQI
2nd Jul 20262911 AMAQI
2nd Jul 20262912 PMAQI
2nd Jul 2026271 PMAQI
2nd Jul 2026302 PMAQI
2nd Jul 2026263 PMAQI
2nd Jul 2026344 PMAQI
2nd Jul 2026325 PMAQI
2nd Jul 2026446 PMAQI
2nd Jul 2026297 PMAQI
2nd Jul 2026258 PMAQI
2nd Jul 2026399 PMAQI
2nd Jul 20264010 PMAQI
2nd Jul 20263211 PMAQI
3rd Jul 20263412 AMAQI
3rd Jul 2026301 AMAQI
3rd Jul 2026302 AMAQI
3rd Jul 2026283 AMAQI
3rd Jul 2026294 AMAQI

27°C22/36°C

3rd Jul 2026275 AMAQI
3rd Jul 2026296 AMAQI
3rd Jul 2026327 AMAQI
3rd Jul 2026278 AMAQI
3rd Jul 2026299 AMAQI
3rd Jul 20263010 AMAQI
3rd Jul 20263011 AMAQI
3rd Jul 20263012 PMAQI
3rd Jul 2026301 PMAQI
3rd Jul 2026292 PMAQI
3rd Jul 2026283 PMAQI
3rd Jul 2026314 PMAQI
3rd Jul 2026285 PMAQI
3rd Jul 2026296 PMAQI
3rd Jul 2026287 PMAQI
3rd Jul 2026268 PMAQI
3rd Jul 2026269 PMAQI
3rd Jul 20262510 PMAQI
3rd Jul 20262611 PMAQI
4th Jul 20263312 AMAQI
4th Jul 2026261 AMAQI
4th Jul 2026312 AMAQI
4th Jul 2026293 AMAQI
4th Jul 2026274 AMAQI

27°C22/34°C

4th Jul 2026265 AMAQI
4th Jul 2026306 AMAQI
4th Jul 2026277 AMAQI
4th Jul 2026278 AMAQI
4th Jul 2026309 AMAQI
4th Jul 20262710 AMAQI
4th Jul 20262911 AMAQI
4th Jul 20262912 PMAQI
4th Jul 2026251 PMAQI
4th Jul 2026262 PMAQI
4th Jul 2026263 PMAQI
4th Jul 2026264 PMAQI
4th Jul 2026265 PMAQI
4th Jul 2026256 PMAQI
4th Jul 2026247 PMAQI
4th Jul 2026218 PMAQI
4th Jul 2026209 PMAQI
4th Jul 20262010 PMAQI
4th Jul 20262111 PMAQI
5th Jul 20262212 AMAQI
5th Jul 2026231 AMAQI
5th Jul 2026292 AMAQI
5th Jul 2026283 AMAQI
5th Jul 2026404 AMAQI

25°C20/31°C

5th Jul 2026415 AMAQI
5th Jul 2026256 AMAQI
5th Jul 2026237 AMAQI
5th Jul 2026288 AMAQI
5th Jul 2026249 AMAQI
5th Jul 20262710 AMAQI
5th Jul 20262811 AMAQI
5th Jul 20262912 PMAQI
5th Jul 2026311 PMAQI
5th Jul 2026312 PMAQI
5th Jul 2026253 PMAQI
5th Jul 2026294 PMAQI
5th Jul 2026295 PMAQI
5th Jul 2026276 PMAQI
5th Jul 2026267 PMAQI
5th Jul 2026228 PMAQI
5th Jul 2026229 PMAQI
5th Jul 20262010 PMAQI
5th Jul 20262111 PMAQI
6th Jul 20262012 AMAQI
6th Jul 2026241 AMAQI
6th Jul 2026362 AMAQI
6th Jul 2026283 AMAQI
6th Jul 2026224 AMAQI

23°C16/31°C

6th Jul 2026215 AMAQI
6th Jul 2026236 AMAQI
6th Jul 2026287 AMAQI
6th Jul 2026298 AMAQI
6th Jul 2026299 AMAQI
6th Jul 20263010 AMAQI
6th Jul 20263111 AMAQI
6th Jul 20263312 PMAQI
6th Jul 2026321 PMAQI
6th Jul 2026312 PMAQI
6th Jul 2026323 PMAQI
6th Jul 2026354 PMAQI
6th Jul 2026375 PMAQI
6th Jul 2026346 PMAQI
6th Jul 2026377 PMAQI
6th Jul 2026348 PMAQI
6th Jul 2026279 PMAQI
6th Jul 20262510 PMAQI
6th Jul 20262511 PMAQI
7th Jul 20262312 AMAQI
7th Jul 2026271 AMAQI
7th Jul 2026322 AMAQI
7th Jul 2026503 AMAQI
7th Jul 2026304 AMAQI

24°C16/33°C

7th Jul 2026305 AMAQI
7th Jul 2026306 AMAQI
7th Jul 2026307 AMAQI
7th Jul 2026288 AMAQI
7th Jul 2026299 AMAQI
7th Jul 20262910 AMAQI
7th Jul 20263211 AMAQI
7th Jul 20263312 PMAQI
7th Jul 2026311 PMAQI
7th Jul 2026312 PMAQI
7th Jul 2026293 PMAQI
7th Jul 2026324 PMAQI
7th Jul 2026325 PMAQI
7th Jul 2026316 PMAQI
7th Jul 2026307 PMAQI
7th Jul 2026288 PMAQI
7th Jul 2026289 PMAQI
7th Jul 20262610 PMAQI
7th Jul 20262611 PMAQI
8th Jul 20262612 AMAQI
8th Jul 2026261 AMAQI
8th Jul 2026302 AMAQI
8th Jul 2026303 AMAQI
8th Jul 2026264 AMAQI

26°C20/33°C

8th Jul 2026255 AMAQI
8th Jul 2026216 AMAQI
8th Jul 2026217 AMAQI
8th Jul 2026248 AMAQI
8th Jul 2026269 AMAQI
8th Jul 20262810 AMAQI
8th Jul 20263111 AMAQI
8th Jul 20263112 PMAQI
8th Jul 2026311 PMAQI
8th Jul 2026302 PMAQI
8th Jul 2026283 PMAQI
8th Jul 2026294 PMAQI
8th Jul 2026295 PMAQI
8th Jul 2026306 PMAQI
8th Jul 2026297 PMAQI
8th Jul 2026258 PMAQI
8th Jul 2026269 PMAQI
8th Jul 20262510 PMAQI
8th Jul 20262711 PMAQI
9th Jul 20262912 AMAQI
9th Jul 2026261 AMAQI
9th Jul 2026262 AMAQI
9th Jul 2026273 AMAQI
9th Jul 2026274 AMAQI

26°C19/35°C

9th Jul 2026275 AMAQI
9th Jul 2026256 AMAQI
9th Jul 2026267 AMAQI
9th Jul 2026268 AMAQI
9th Jul 2026299 AMAQI
9th Jul 20263110 AMAQI
9th Jul 20263011 AMAQI
9th Jul 20263212 PMAQI
9th Jul 2026301 PMAQI
9th Jul 2026292 PMAQI
9th Jul 2026273 PMAQI
9th Jul 2026304 PMAQI
9th Jul 2026305 PMAQI
9th Jul 2026306 PMAQI
9th Jul 2026317 PMAQI
9th Jul 2026328 PMAQI
9th Jul 2026319 PMAQI
9th Jul 20262910 PMAQI
9th Jul 20262911 PMAQI
10th Jul 20262612 AMAQI
10th Jul 2026251 AMAQI
10th Jul 2026252 AMAQI
10th Jul 2026283 AMAQI
10th Jul 2026324 AMAQI

24°C20/30°C

10th Jul 2026325 AMAQI
10th Jul 2026326 AMAQI
10th Jul 2026327 AMAQI
10th Jul 2026328 AMAQI
10th Jul 2026349 AMAQI
10th Jul 20263610 AMAQI
10th Jul 20263711 AMAQI
10th Jul 20263712 PMAQI
10th Jul 2026351 PMAQI
10th Jul 2026342 PMAQI
10th Jul 2026313 PMAQI
10th Jul 2026344 PMAQI
10th Jul 2026365 PMAQI
10th Jul 2026356 PMAQI
10th Jul 2026357 PMAQI
10th Jul 2026408 PMAQI
10th Jul 2026389 PMAQI
10th Jul 20263010 PMAQI
10th Jul 20262911 PMAQI
11th Jul 20262612 AMAQI
11th Jul 2026261 AMAQI
11th Jul 2026252 AMAQI
11th Jul 2026283 AMAQI
11th Jul 2026324 AMAQI

23°C18/29°C

11th Jul 2026315 AMAQI
11th Jul 2026316 AMAQI
11th Jul 2026287 AMAQI
11th Jul 2026368 AMAQI
11th Jul 2026349 AMAQI
11th Jul 20263310 AMAQI
11th Jul 20263211 AMAQI
11th Jul 20263512 PMAQI
11th Jul 2026331 PMAQI
11th Jul 2026332 PMAQI
11th Jul 2026293 PMAQI
11th Jul 2026314 PMAQI
11th Jul 2026325 PMAQI
11th Jul 2026326 PMAQI
11th Jul 2026307 PMAQI
11th Jul 2026328 PMAQI
11th Jul 2026329 PMAQI
11th Jul 20262810 PMAQI
11th Jul 20262811 PMAQI
12th Jul 20262612 AMAQI
12th Jul 2026241 AMAQI
12th Jul 2026232 AMAQI
12th Jul 2026273 AMAQI
12th Jul 2026594 AMAQI

22°C15/29°C

12th Jul 2026305 AMAQI
12th Jul 2026306 AMAQI
12th Jul 2026307 AMAQI
12th Jul 2026338 AMAQI
12th Jul 2026609 AMAQI
12th Jul 20263110 AMAQI
12th Jul 20266111 AMAQI
12th Jul 20263212 PMAQI
12th Jul 2026241 PMAQI
12th Jul 2026312 PMAQI
12th Jul 2026293 PMAQI
12th Jul 2026444 PMAQI
12th Jul 2026405 PMAQI
12th Jul 2026296 PMAQI
12th Jul 2026247 PMAQI
12th Jul 2026308 PMAQI
12th Jul 2026319 PMAQI
12th Jul 20262810 PMAQI
12th Jul 20262811 PMAQI
13th Jul 20262412 AMAQI
13th Jul 2026241 AMAQI
13th Jul 2026232 AMAQI
13th Jul 2026263 AMAQI
13th Jul 2026344 AMAQI

24°C15/32°C

13th Jul 2026325 AMAQI
13th Jul 2026316 AMAQI
13th Jul 2026337 AMAQI
13th Jul 2026328 AMAQI
13th Jul 2026359 AMAQI
13th Jul 20264610 AMAQI
13th Jul 20264711 AMAQI
13th Jul 20264612 PMAQI
13th Jul 2026301 PMAQI
13th Jul 2026332 PMAQI
13th Jul 2026283 PMAQI
13th Jul 2026324 PMAQI
13th Jul 2026325 PMAQI
13th Jul 2026326 PMAQI
13th Jul 2026297 PMAQI
13th Jul 2026348 PMAQI
13th Jul 2026349 PMAQI
13th Jul 20263410 PMAQI
13th Jul 20262611 PMAQI
14th Jul 20262212 AMAQI
14th Jul 2026221 AMAQI
14th Jul 2026332 AMAQI
14th Jul 2026343 AMAQI
14th Jul 2026374 AMAQI

24°C17/33°C

14th Jul 2026325 AMAQI
14th Jul 2026316 AMAQI
14th Jul 2026347 AMAQI
14th Jul 2026328 AMAQI
14th Jul 2026349 AMAQI
14th Jul 20263610 AMAQI
14th Jul 20263811 AMAQI
14th Jul 20263912 PMAQI
14th Jul 2026361 PMAQI
14th Jul 2026342 PMAQI
14th Jul 2026303 PMAQI
14th Jul 2026344 PMAQI
14th Jul 2026275 PMAQI
14th Jul 2026326 PMAQI
14th Jul 2026327 PMAQI
14th Jul 2026558 PMAQI
14th Jul 2026579 PMAQI
14th Jul 20262810 PMAQI
14th Jul 20262611 PMAQI
15th Jul 20262412 AMAQI
15th Jul 2026231 AMAQI
15th Jul 2026652 AMAQI
15th Jul 2026423 AMAQI
15th Jul 2026474 AMAQI

27°C21/35°C

15th Jul 2026495 AMAQI
15th Jul 2026456 AMAQI
15th Jul 2026417 AMAQI
15th Jul 2026428 AMAQI
15th Jul 2026429 AMAQI
15th Jul 20265610 AMAQI
15th Jul 20264111 AMAQI
15th Jul 20263812 PMAQI
15th Jul 2026361 PMAQI
15th Jul 2026422 PMAQI
15th Jul 2026443 PMAQI
15th Jul 2026304 PMAQI
15th Jul 2026345 PMAQI
15th Jul 2026296 PMAQI
15th Jul 2026317 PMAQI
15th Jul 2026318 PMAQI
15th Jul 2026329 PMAQI
15th Jul 20263010 PMAQI
15th Jul 20262911 PMAQI
16th Jul 20263212 AMAQI
16th Jul 2026381 AMAQI
16th Jul 2026382 AMAQI
16th Jul 2026263 AMAQI
16th Jul 2026264 AMAQI

25°C20/31°C

16th Jul 2026305 AMAQI
16th Jul 2026326 AMAQI
16th Jul 2026507 AMAQI
16th Jul 2026538 AMAQI
16th Jul 2026589 AMAQI
16th Jul 20266310 AMAQI
16th Jul 20266011 AMAQI
16th Jul 20263112 PMAQI
16th Jul 2026611 PMAQI
16th Jul 2026302 PMAQI
16th Jul 2026383 PMAQI
16th Jul 2026304 PMAQI
16th Jul 2026305 PMAQI
16th Jul 2026316 PMAQI
16th Jul 2026267 PMAQI
16th Jul 2026278 PMAQI
16th Jul 2026319 PMAQI
16th Jul 20262810 PMAQI
16th Jul 20262811 PMAQI
17th Jul 20262512 AMAQI
17th Jul 2026251 AMAQI
17th Jul 2026242 AMAQI
17th Jul 2026273 AMAQI
17th Jul 2026364 AMAQI

22°C17/28°C

17th Jul 2026485 AMAQI
17th Jul 2026476 AMAQI
17th Jul 2026507 AMAQI
17th Jul 2026478 AMAQI
17th Jul 2026339 AMAQI
17th Jul 20263210 AMAQI
17th Jul 20263911 AMAQI
17th Jul 20264012 PMAQI
17th Jul 2026441 PMAQI
17th Jul 2026372 PMAQI
17th Jul 2026363 PMAQI
17th Jul 2026224 PMAQI
17th Jul 2026205 PMAQI
17th Jul 2026206 PMAQI
17th Jul 2026267 PMAQI
17th Jul 2026338 PMAQI
17th Jul 2026359 PMAQI
17th Jul 20263310 PMAQI
17th Jul 20264011 PMAQI
18th Jul 20263012 AMAQI
18th Jul 2026411 AMAQI
18th Jul 2026242 AMAQI
18th Jul 2026273 AMAQI
18th Jul 2026514 AMAQI

21°C14/30°C

18th Jul 2026425 AMAQI
18th Jul 2026386 AMAQI
18th Jul 2026387 AMAQI
18th Jul 2026328 AMAQI
18th Jul 2026459 AMAQI
18th Jul 20263710 AMAQI
18th Jul 20263511 AMAQI
18th Jul 20262412 PMAQI
18th Jul 2026351 PMAQI
18th Jul 2026342 PMAQI
18th Jul 2026443 PMAQI
18th Jul 2026424 PMAQI
18th Jul 2026605 PMAQI
18th Jul 2026646 PMAQI
18th Jul 2026627 PMAQI
18th Jul 2026628 PMAQI
18th Jul 2026629 PMAQI
18th Jul 20266510 PMAQI
18th Jul 20267511 PMAQI
19th Jul 20266612 AMAQI
19th Jul 2026601 AMAQI
19th Jul 2026442 AMAQI
19th Jul 2026413 AMAQI
19th Jul 2026344 AMAQI

19°C17/23°C

19th Jul 2026375 AMAQI
19th Jul 2026446 AMAQI
19th Jul 2026337 AMAQI
19th Jul 2026478 AMAQI
19th Jul 2026429 AMAQI
19th Jul 20263610 AMAQI
19th Jul 20262811 AMAQI
19th Jul 20264612 PMAQI
19th Jul 2026431 PMAQI
19th Jul 2026622 PMAQI
19th Jul 2026733 PMAQI
19th Jul 2026724 PMAQI
19th Jul 2026515 PMAQI
19th Jul 2026516 PMAQI
19th Jul 2026247 PMAQI
19th Jul 2026278 PMAQI
19th Jul 2026259 PMAQI
19th Jul 20262610 PMAQI
19th Jul 20262211 PMAQI
20th Jul 20266612 AMAQI
20th Jul 2026641 AMAQI
20th Jul 2026702 AMAQI
20th Jul 2026643 AMAQI
20th Jul 2026644 AMAQI

20°C14/25°C

20th Jul 2026435 AMAQI
20th Jul 2026546 AMAQI
20th Jul 2026507 AMAQI
20th Jul 2026258 AMAQI
20th Jul 2026309 AMAQI
20th Jul 20262510 AMAQI
20th Jul 20262711 AMAQI
20th Jul 20262912 PMAQI
20th Jul 2026241 PMAQI
20th Jul 2026412 PMAQI
20th Jul 2026363 PMAQI
20th Jul 2026274 PMAQI
20th Jul 2026235 PMAQI
20th Jul 2026376 PMAQI
20th Jul 2026257 PMAQI
20th Jul 2026358 PMAQI
20th Jul 2026389 PMAQI
20th Jul 20264210 PMAQI
21st Jul 20264112 AMAQI
21st Jul 2026331 AMAQI
21st Jul 2026242 AMAQI
21st Jul 2026343 AMAQI
21st Jul 2026324 AMAQI

21°C14/30°C

21st Jul 2026465 AMAQI
21st Jul 2026406 AMAQI
21st Jul 2026467 AMAQI
21st Jul 2026338 AMAQI
21st Jul 2026299 AMAQI
21st Jul 20263910 AMAQI
21st Jul 20263811 AMAQI
21st Jul 20263012 PMAQI
21st Jul 2026461 PMAQI
21st Jul 2026512 PMAQI
21st Jul 2026543 PMAQI
21st Jul 2026534 PMAQI
21st Jul 2026525 PMAQI
21st Jul 2026506 PMAQI
21st Jul 2026477 PMAQI
21st Jul 2026448 PMAQI
21st Jul 2026449 PMAQI
21st Jul 20264210 PMAQI
21st Jul 20263911 PMAQI
22nd Jul 20263912 AMAQI
22nd Jul 2026411 AMAQI
22nd Jul 2026402 AMAQI
22nd Jul 2026363 AMAQI
22nd Jul 2026374 AMAQI

23°C18/30°C

22nd Jul 2026365 AMAQI
22nd Jul 2026386 AMAQI
22nd Jul 2026277 AMAQI
22nd Jul 2026218 AMAQI
22nd Jul 2026269 AMAQI
22nd Jul 20262710 AMAQI
22nd Jul 20262111 AMAQI
22nd Jul 20262112 PMAQI
22nd Jul 2026251 PMAQI
22nd Jul 2026252 PMAQI
22nd Jul 2026243 PMAQI
22nd Jul 2026334 PMAQI
22nd Jul 2026235 PMAQI
22nd Jul 2026256 PMAQI
22nd Jul 2026167 PMAQI
22nd Jul 2026258 PMAQI
22nd Jul 2026159 PMAQI
22nd Jul 20262510 PMAQI
22nd Jul 20261411 PMAQI
23rd Jul 20261912 AMAQI
23rd Jul 2026221 AMAQI
23rd Jul 2026462 AMAQI
23rd Jul 2026313 AMAQI
23rd Jul 2026254 AMAQI

20°C15/23°C

23rd Jul 2026155 AMAQI
23rd Jul 2026236 AMAQI
23rd Jul 2026167 AMAQI
23rd Jul 202688 AMAQI
23rd Jul 202689 AMAQI
23rd Jul 20261810 AMAQI
23rd Jul 2026811 AMAQI
23rd Jul 20262512 PMAQI
23rd Jul 2026121 PMAQI
23rd Jul 2026232 PMAQI
23rd Jul 2026183 PMAQI
23rd Jul 2026264 PMAQI
23rd Jul 2026425 PMAQI
23rd Jul 2026446 PMAQI
23rd Jul 2026647 PMAQI
23rd Jul 2026258 PMAQI
23rd Jul 2026249 PMAQI
23rd Jul 20262410 PMAQI
23rd Jul 20262511 PMAQI
24th Jul 20262512 AMAQI
24th Jul 2026291 AMAQI
24th Jul 2026252 AMAQI
24th Jul 2026353 AMAQI
24th Jul 2026264 AMAQI

19°C12/28°C

24th Jul 2026255 AMAQI
24th Jul 2026256 AMAQI
24th Jul 2026367 AMAQI
24th Jul 2026258 AMAQI
24th Jul 2026279 AMAQI
24th Jul 20262410 AMAQI
24th Jul 20263211 AMAQI
24th Jul 20263112 PMAQI
24th Jul 2026291 PMAQI
24th Jul 2026252 PMAQI
24th Jul 2026353 PMAQI
24th Jul 2026284 PMAQI
24th Jul 2026225 PMAQI
24th Jul 2026356 PMAQI
24th Jul 2026247 PMAQI
24th Jul 2026388 PMAQI
24th Jul 2026409 PMAQI
24th Jul 20264110 PMAQI
24th Jul 20264411 PMAQI
25th Jul 20264312 AMAQI
25th Jul 2026451 AMAQI
25th Jul 2026482 AMAQI
25th Jul 2026473 AMAQI
25th Jul 2026484 AMAQI

22°C15/29°C

25th Jul 2026485 AMAQI
25th Jul 2026486 AMAQI
25th Jul 2026497 AMAQI
25th Jul 2026488 AMAQI
25th Jul 2026489 AMAQI
25th Jul 20264610 AMAQI
25th Jul 20264311 AMAQI
25th Jul 20264112 PMAQI
25th Jul 2026431 PMAQI
25th Jul 2026402 PMAQI
25th Jul 2026303 PMAQI
25th Jul 2026404 PMAQI
25th Jul 2026305 PMAQI
25th Jul 2026216 PMAQI
25th Jul 2026307 PMAQI
25th Jul 2026278 PMAQI
25th Jul 2026359 PMAQI
25th Jul 20263410 PMAQI
25th Jul 20264111 PMAQI
26th Jul 20264012 AMAQI
26th Jul 2026461 AMAQI
26th Jul 2026482 AMAQI
26th Jul 2026473 AMAQI
26th Jul 2026464 AMAQI

24°C16/33°C

26th Jul 2026435 AMAQI
26th Jul 2026466 AMAQI
26th Jul 2026477 AMAQI
26th Jul 2026438 AMAQI
26th Jul 2026459 AMAQI
26th Jul 20264410 AMAQI
26th Jul 20264411 AMAQI
26th Jul 20264412 PMAQI
26th Jul 2026421 PMAQI
26th Jul 2026422 PMAQI
26th Jul 2026403 PMAQI
26th Jul 2026404 PMAQI
26th Jul 2026395 PMAQI
26th Jul 2026386 PMAQI
26th Jul 2026317 PMAQI
26th Jul 2026328 PMAQI
26th Jul 2026359 PMAQI
26th Jul 20263110 PMAQI
26th Jul 20263211 PMAQI
27th Jul 20263012 AMAQI
27th Jul 2026311 AMAQI
27th Jul 2026302 AMAQI
27th Jul 2026293 AMAQI
27th Jul 2026374 AMAQI

25°C17/33°C

27th Jul 2026315 AMAQI
27th Jul 2026276 AMAQI
27th Jul 2026437 AMAQI
27th Jul 2026398 AMAQI
27th Jul 2026409 AMAQI
27th Jul 20264010 AMAQI
27th Jul 20264211 AMAQI
27th Jul 20264312 PMAQI
27th Jul 2026431 PMAQI
27th Jul 2026442 PMAQI
27th Jul 2026433 PMAQI
27th Jul 2026454 PMAQI
27th Jul 2026435 PMAQI
27th Jul 2026456 PMAQI
27th Jul 2026467 PMAQI
27th Jul 2026458 PMAQI
27th Jul 2026469 PMAQI
27th Jul 20264610 PMAQI
27th Jul 20264911 PMAQI
28th Jul 20264912 AMAQI
28th Jul 2026461 AMAQI
28th Jul 2026462 AMAQI
28th Jul 2026473 AMAQI
28th Jul 2026494 AMAQI

25°C19/33°C

28th Jul 2026485 AMAQI
28th Jul 2026496 AMAQI
28th Jul 2026507 AMAQI
28th Jul 2026498 AMAQI
28th Jul 2026509 AMAQI
28th Jul 20264910 AMAQI
28th Jul 20265011 AMAQI
28th Jul 20265112 PMAQI
28th Jul 2026521 PMAQI
28th Jul 2026522 PMAQI
28th Jul 2026533 PMAQI
28th Jul 2026544 PMAQI
28th Jul 2026545 PMAQI
28th Jul 2026546 PMAQI
28th Jul 2026547 PMAQI
28th Jul 2026548 PMAQI
28th Jul 2026529 PMAQI
28th Jul 20265210 PMAQI
28th Jul 20265011 PMAQI
29th Jul 20265012 AMAQI
29th Jul 2026501 AMAQI
29th Jul 2026502 AMAQI
29th Jul 2026483 AMAQI
29th Jul 2026454 AMAQI

23°C18/28°C

29th Jul 2026435 AMAQI
5 AM
29th Jul 2026386 AMAQI
29th Jul 2026357 AMAQI
29th Jul 2026368 AMAQI
29th Jul 2026349 AMAQI
29th Jul 20263410 AMAQI
29th Jul 20263211 AMAQI
29th Jul 20263012 PMAQI
12 PM
29th Jul 2026361 PMAQI
29th Jul 2026382 PMAQI
29th Jul 2026453 PMAQI
29th Jul 2026234 PMAQI
29th Jul 2026375 PMAQI
29th Jul 2026406 PMAQI
29th Jul 2026367 PMAQI
29th Jul 2026428 PMAQI
8 PM
29th Jul 2026409 PMAQI
29th Jul 20264110 PMAQI
29th Jul 20263811 PMAQI
12 AM
4 AM

22°C20/28°C

Day time
Avg. Highest Time
5 AM - 6 PM

34AQI

14 hours / Day
420 hours / Month
Avg. Lowest Time
6 AM

33AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 6 PM (Avg. 34), while the lowest AQI was between 6 AM to 6 AM (Avg. 33).
Night time
Avg. Highest Time
4 AM

36AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
11 PM

31AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 4 AM (Avg. 36), while the lowest AQI was between 11 PM to 11 PM (Avg. 31).

2026 Days Vs Air Quality

Longueuil, Quebec, Canada

2026

93%

192

7%

14

Total number of days with different AQI categories in last 210 days in 2026 (155 days remaining)

Good
192 Days
Moderate
14 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 93%

Health Risk Level:

Very Low

In 2026, 93% of 210 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

Longueuil, Quebec, Canada

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
17AQI (US)
2nd January 2026
32AQI (US)
3rd January 2026
19AQI (US)
4th January 2026
44AQI (US)
5th January 2026
44AQI (US)
6th January 2026
59AQI (US)
7th January 2026
58AQI (US)
8th January 2026
66AQI (US)
9th January 2026
43AQI (US)
10th January 2026
16AQI (US)
11th January 2026
17AQI (US)
12th January 2026
18AQI (US)
13th January 2026
48AQI (US)
14th January 2026
40AQI (US)
15th January 2026
34AQI (US)
16th January 2026
16AQI (US)
17th January 2026
40AQI (US)
18th January 2026
35AQI (US)
19th January 2026
46AQI (US)
20th January 2026
22AQI (US)
21st January 2026
29AQI (US)
22nd January 2026
49AQI (US)
23rd January 2026
54AQI (US)
24th January 2026
48AQI (US)
25th January 2026
46AQI (US)
26th January 2026
48AQI (US)
27th January 2026
44AQI (US)
28th January 2026
47AQI (US)
29th January 2026
52AQI (US)
30th January 2026
50AQI (US)
31st January 2026
45AQI (US)
1st February 2026
48AQI (US)
2nd February 2026
49AQI (US)
3rd February 2026
50AQI (US)
4th February 2026
54AQI (US)
5th February 2026
50AQI (US)
6th February 2026
41AQI (US)
7th February 2026
39AQI (US)
8th February 2026
45AQI (US)
9th February 2026
46AQI (US)
10th February 2026
46AQI (US)
11th February 2026
47AQI (US)
12th February 2026
45AQI (US)
13th February 2026
52AQI (US)
14th February 2026
49AQI (US)
15th February 2026
42AQI (US)
16th February 2026
44AQI (US)
17th February 2026
45AQI (US)
18th February 2026
42AQI (US)
19th February 2026
41AQI (US)
20th February 2026
43AQI (US)
21st February 2026
37AQI (US)
22nd February 2026
35AQI (US)
23rd February 2026
40AQI (US)
24th February 2026
44AQI (US)
25th February 2026
42AQI (US)
26th February 2026
35AQI (US)
27th February 2026
35AQI (US)
28th February 2026
38AQI (US)
1st March 2026
42AQI (US)
2nd March 2026
53AQI (US)
3rd March 2026
46AQI (US)
4th March 2026
45AQI (US)
5th March 2026
42AQI (US)
6th March 2026
38AQI (US)
7th March 2026
40AQI (US)
8th March 2026
39AQI (US)
9th March 2026
40AQI (US)
10th March 2026
34AQI (US)
11th March 2026
42AQI (US)
12th March 2026
42AQI (US)
13th March 2026
40AQI (US)
14th March 2026
37AQI (US)
15th March 2026
36AQI (US)
16th March 2026
36AQI (US)
17th March 2026
34AQI (US)
18th March 2026
33AQI (US)
19th March 2026
32AQI (US)
20th March 2026
36AQI (US)
21st March 2026
36AQI (US)
22nd March 2026
36AQI (US)
23rd March 2026
41AQI (US)
24th March 2026
36AQI (US)
25th March 2026
34AQI (US)
26th March 2026
30AQI (US)
27th March 2026
30AQI (US)
28th March 2026
35AQI (US)
29th March 2026
31AQI (US)
30th March 2026
28AQI (US)
31st March 2026
25AQI (US)
1st April 2026
32AQI (US)
2nd April 2026
34AQI (US)
3rd April 2026
28AQI (US)
4th April 2026
31AQI (US)
5th April 2026
29AQI (US)
6th April 2026
28AQI (US)
7th April 2026
27AQI (US)
8th April 2026
31AQI (US)
9th April 2026
28AQI (US)
10th April 2026
31AQI (US)
11th April 2026
33AQI (US)
12th April 2026
29AQI (US)
13th April 2026
33AQI (US)
14th April 2026
34AQI (US)
15th April 2026
34AQI (US)
16th April 2026
30AQI (US)
17th April 2026
18th April 2026
34AQI (US)
19th April 2026
34AQI (US)
20th April 2026
30AQI (US)
21st April 2026
28AQI (US)
22nd April 2026
23rd April 2026
25AQI (US)
24th April 2026
28AQI (US)
25th April 2026
32AQI (US)
26th April 2026
33AQI (US)
27th April 2026
29AQI (US)
28th April 2026
25AQI (US)
29th April 2026
23AQI (US)
30th April 2026
26AQI (US)
1st May 2026
27AQI (US)
2nd May 2026
25AQI (US)
3rd May 2026
21AQI (US)
4th May 2026
29AQI (US)
5th May 2026
32AQI (US)
6th May 2026
31AQI (US)
7th May 2026
28AQI (US)
8th May 2026
28AQI (US)
9th May 2026
10th May 2026
34AQI (US)
11th May 2026
32AQI (US)
12th May 2026
30AQI (US)
13th May 2026
29AQI (US)
14th May 2026
25AQI (US)
15th May 2026
45AQI (US)
16th May 2026
53AQI (US)
17th May 2026
56AQI (US)
18th May 2026
57AQI (US)
19th May 2026
54AQI (US)
20th May 2026
49AQI (US)
21st May 2026
44AQI (US)
22nd May 2026
44AQI (US)
23rd May 2026
51AQI (US)
24th May 2026
48AQI (US)
25th May 2026
45AQI (US)
26th May 2026
28AQI (US)
27th May 2026
26AQI (US)
28th May 2026
18AQI (US)
29th May 2026
19AQI (US)
30th May 2026
20AQI (US)
31st May 2026
26AQI (US)
1st June 2026
27AQI (US)
2nd June 2026
24AQI (US)
3rd June 2026
22AQI (US)
4th June 2026
24AQI (US)
5th June 2026
27AQI (US)
6th June 2026
25AQI (US)
7th June 2026
20AQI (US)
8th June 2026
25AQI (US)
9th June 2026
24AQI (US)
10th June 2026
27AQI (US)
11th June 2026
25AQI (US)
12th June 2026
26AQI (US)
13th June 2026
22AQI (US)
14th June 2026
23AQI (US)
15th June 2026
23AQI (US)
16th June 2026
25AQI (US)
17th June 2026
26AQI (US)
18th June 2026
25AQI (US)
19th June 2026
23AQI (US)
20th June 2026
23AQI (US)
21st June 2026
21AQI (US)
22nd June 2026
23AQI (US)
23rd June 2026
22AQI (US)
24th June 2026
24AQI (US)
25th June 2026
25AQI (US)
26th June 2026
27AQI (US)
27th June 2026
28AQI (US)
28th June 2026
28AQI (US)
29th June 2026
26AQI (US)
30th June 2026
26AQI (US)
1st July 2026
27AQI (US)
2nd July 2026
28AQI (US)
3rd July 2026
29AQI (US)
4th July 2026
26AQI (US)
5th July 2026
27AQI (US)
6th July 2026
29AQI (US)
7th July 2026
30AQI (US)
8th July 2026
27AQI (US)
9th July 2026
28AQI (US)
10th July 2026
32AQI (US)
11th July 2026
31AQI (US)
12th July 2026
33AQI (US)
13th July 2026
32AQI (US)
14th July 2026
34AQI (US)
15th July 2026
39AQI (US)
16th July 2026
37AQI (US)
17th July 2026
34AQI (US)
18th July 2026
44AQI (US)
19th July 2026
43AQI (US)
20th July 2026
41AQI (US)
21st July 2026
41AQI (US)
22nd July 2026
28AQI (US)
23rd July 2026
25AQI (US)
24th July 2026
30AQI (US)
25th July 2026
41AQI (US)
26th July 2026
41AQI (US)
27th July 2026
40AQI (US)
28th July 2026
51AQI (US)
29th July 2026
30th July 2026
31st July 2026
1st August 2026
2nd August 2026
3rd August 2026
4th August 2026
5th August 2026
6th August 2026
7th August 2026
8th August 2026
9th August 2026
10th August 2026
11th August 2026
12th August 2026
13th August 2026
14th August 2026
15th August 2026
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

40AQI (US)

44AQI (US)

37AQI (US)

30AQI (US)

35AQI (US)

25AQI (US)

34AQI (US)

No. of days

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

202635AQI (US)

26
5
26
2
30
1
28
25
5
30
27
1
192
14

Highest AQI (US) recorded in

February

44AQI (US)

Lowest AQI (US) recorded in

June

25AQI (US)

202533AQI (US)

28
3
26
2
27
4
30
31
25
5
26
5
23
8
30
26
5
27
3
25
6
324
41

Highest AQI (US) recorded in

July

40AQI (US)

Lowest AQI (US) recorded in

April

23AQI (US)

202431AQI (US)

29
2
24
5
28
3
30
31
27
3
29
2
22
9
24
6
31
30
26
4
1
331
34
1

Highest AQI (US) recorded in

December

38AQI (US)

Lowest AQI (US) recorded in

November

24AQI (US)

202336AQI (US)

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 (US) recorded in

June

54AQI (US)

Lowest AQI (US) recorded in

November

27AQI (US)

202233AQI (US)

20
11
19
4
28
3
29
1
29
2
29
1
23
1
4
30
29
2
28
2
27
4
295
31

Highest AQI (US) recorded in

January

44AQI (US)

Lowest AQI (US) recorded in

August

23AQI (US)

202132AQI (US)

27
4
21
7
28
3
29
1
28
3
30
27
4
23
8
30
30
1
27
3
27
4
327
38

Highest AQI (US) recorded in

August

41AQI (US)

Lowest AQI (US) recorded in

September

22AQI (US)

202025AQI (US)

12
1
20
21
30
31
31
30
31
25
5
29
2
260
8

Highest AQI (US) recorded in

November

34AQI (US)

Lowest AQI (US) recorded in

October

21AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
36AQI (US)
Least Polluted Year Recorded
2020(Avg.)
25AQI (US)

Longueuil's annual 2026 AQI (US) (35) shows an average percentage change of 11.9% (worsened AQI (US)) compared to previous years: 2020 (25), 2021 (32), 2022 (33), 2023 (36), 2024 (31), 2025 (33).