Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Guelph, Ontario, 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

Guelph, Ontario, Canada

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
16th Aug 2023
90AQI
Lowest AQI recorded on
31st Aug 2022
19AQI

Same Day Analysis (1st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 60 of Moderate air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 1st Aug - 2nd Aug 2025

Guelph, Ontario, Canada

AQI
Day
Night
.

5 AM1st Aug 2025

8 PM

4 AM2nd Aug 2025

Day time
Avg. Highest Time
6AM1st Aug

65AQI

Avg. Lowest Time
7PM1st Aug

25AQI

Night time
Avg. Highest Time
5AM1st Aug

71AQI

Avg. Lowest Time
11PM1st Aug

23AQI

In the last 24 hours,

Guelph's AQI reached its highest point of 71 at 5 AM during the Night, while the lowest point, 23, was recorded at 11 PM during the Night between 1st Aug and 2nd Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Guelph, Ontario, Canada

JulAug
03rd - 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 - 30th30th - 31st31st - 01st01st - 02nd02nd
Day
Night
3rd Jul 2025465 AMAQI
3rd Jul 2025486 AMAQI
3rd Jul 2025487 AMAQI
3rd Jul 2025458 AMAQI
3rd Jul 2025479 AMAQI
3rd Jul 20255010 AMAQI
3rd Jul 20255211 AMAQI
3rd Jul 20254812 PMAQI
3rd Jul 2025481 PMAQI
3rd Jul 2025482 PMAQI
3rd Jul 2025473 PMAQI
3rd Jul 2025484 PMAQI
3rd Jul 2025535 PMAQI
3rd Jul 2025526 PMAQI
3rd Jul 2025517 PMAQI
3rd Jul 2025478 PMAQI
3rd Jul 2025489 PMAQI
3rd Jul 20254910 PMAQI
3rd Jul 20254111 PMAQI
4th Jul 20254212 AMAQI
4th Jul 2025401 AMAQI
4th Jul 2025352 AMAQI
4th Jul 2025383 AMAQI
4th Jul 2025374 AMAQI

--°C/°C

4th Jul 2025365 AMAQI
4th Jul 2025386 AMAQI
4th Jul 2025347 AMAQI
4th Jul 2025378 AMAQI
4th Jul 2025389 AMAQI
4th Jul 20253610 AMAQI
4th Jul 20253611 AMAQI
4th Jul 20253412 PMAQI
4th Jul 2025351 PMAQI
4th Jul 2025342 PMAQI
4th Jul 2025353 PMAQI
4th Jul 2025364 PMAQI
4th Jul 2025385 PMAQI
4th Jul 2025406 PMAQI
4th Jul 2025407 PMAQI
4th Jul 2025428 PMAQI
4th Jul 2025389 PMAQI
4th Jul 20253710 PMAQI
4th Jul 20254211 PMAQI
5th Jul 20254212 AMAQI
5th Jul 2025441 AMAQI
5th Jul 2025422 AMAQI
5th Jul 2025443 AMAQI
5th Jul 2025444 AMAQI

19°C10/27°C

5th Jul 2025405 AMAQI
5th Jul 2025426 AMAQI
5th Jul 2025407 AMAQI
5th Jul 2025398 AMAQI
5th Jul 2025399 AMAQI
5th Jul 20254210 AMAQI
5th Jul 20254811 AMAQI
5th Jul 20254812 PMAQI
5th Jul 2025481 PMAQI
5th Jul 2025462 PMAQI
5th Jul 2025433 PMAQI
5th Jul 2025424 PMAQI
5th Jul 2025425 PMAQI
5th Jul 2025426 PMAQI
5th Jul 2025447 PMAQI
5th Jul 2025438 PMAQI
5th Jul 2025449 PMAQI
5th Jul 20254210 PMAQI
5th Jul 20254411 PMAQI
6th Jul 20254312 AMAQI
6th Jul 2025491 AMAQI
6th Jul 2025492 AMAQI
6th Jul 2025513 AMAQI
6th Jul 2025524 AMAQI

24°C15/32°C

6th Jul 2025525 AMAQI
6th Jul 2025526 AMAQI
6th Jul 2025527 AMAQI
6th Jul 2025528 AMAQI
6th Jul 2025529 AMAQI
6th Jul 20255310 AMAQI
6th Jul 20255311 AMAQI
6th Jul 20255212 PMAQI
6th Jul 2025501 PMAQI
6th Jul 2025502 PMAQI
6th Jul 2025523 PMAQI
6th Jul 2025524 PMAQI
6th Jul 2025525 PMAQI
6th Jul 2025526 PMAQI
6th Jul 2025537 PMAQI
6th Jul 2025538 PMAQI
6th Jul 2025539 PMAQI
6th Jul 20255310 PMAQI
6th Jul 20255311 PMAQI
7th Jul 20255212 AMAQI
7th Jul 2025531 AMAQI
7th Jul 2025522 AMAQI
7th Jul 2025523 AMAQI
7th Jul 2025534 AMAQI

26°C19/34°C

7th Jul 2025525 AMAQI
7th Jul 2025526 AMAQI
7th Jul 2025527 AMAQI
7th Jul 2025518 AMAQI
7th Jul 2025519 AMAQI
7th Jul 20254810 AMAQI
7th Jul 20254311 AMAQI
7th Jul 20254212 PMAQI
7th Jul 2025401 PMAQI
7th Jul 2025412 PMAQI
7th Jul 2025393 PMAQI
7th Jul 2025404 PMAQI
7th Jul 2025405 PMAQI
7th Jul 2025406 PMAQI
7th Jul 2025417 PMAQI
7th Jul 2025418 PMAQI
7th Jul 2025419 PMAQI
7th Jul 20254210 PMAQI
7th Jul 20254011 PMAQI
8th Jul 20254012 AMAQI
8th Jul 2025351 AMAQI
8th Jul 2025262 AMAQI
8th Jul 2025293 AMAQI
8th Jul 2025284 AMAQI

22°C19/24°C

8th Jul 2025275 AMAQI
8th Jul 2025266 AMAQI
8th Jul 2025257 AMAQI
8th Jul 2025258 AMAQI
8th Jul 2025269 AMAQI
8th Jul 20252610 AMAQI
8th Jul 20252611 AMAQI
8th Jul 20252812 PMAQI
8th Jul 2025301 PMAQI
8th Jul 2025312 PMAQI
8th Jul 2025333 PMAQI
8th Jul 2025354 PMAQI
8th Jul 2025375 PMAQI
8th Jul 2025406 PMAQI
8th Jul 2025417 PMAQI
8th Jul 2025378 PMAQI
8th Jul 2025309 PMAQI
8th Jul 20252810 PMAQI
8th Jul 20253211 PMAQI
9th Jul 20253212 AMAQI
9th Jul 2025361 AMAQI
9th Jul 2025382 AMAQI
9th Jul 2025373 AMAQI
9th Jul 2025404 AMAQI

21°C18/24°C

9th Jul 2025405 AMAQI
9th Jul 2025436 AMAQI
9th Jul 2025397 AMAQI
9th Jul 2025348 AMAQI
9th Jul 2025389 AMAQI
9th Jul 20254510 AMAQI
9th Jul 20255011 AMAQI
9th Jul 20255012 PMAQI
9th Jul 2025471 PMAQI
9th Jul 2025382 PMAQI
9th Jul 2025393 PMAQI
9th Jul 2025444 PMAQI
9th Jul 2025475 PMAQI
9th Jul 2025446 PMAQI
9th Jul 2025457 PMAQI
9th Jul 2025408 PMAQI
9th Jul 2025429 PMAQI
9th Jul 20254010 PMAQI
9th Jul 20253511 PMAQI
10th Jul 20253512 AMAQI
10th Jul 2025341 AMAQI
10th Jul 2025292 AMAQI
10th Jul 2025323 AMAQI
10th Jul 2025334 AMAQI

20°C14/25°C

10th Jul 2025325 AMAQI
10th Jul 2025356 AMAQI
10th Jul 2025337 AMAQI
10th Jul 2025328 AMAQI
10th Jul 2025339 AMAQI
10th Jul 20253310 AMAQI
10th Jul 20253411 AMAQI
10th Jul 20253812 PMAQI
10th Jul 2025431 PMAQI
10th Jul 2025452 PMAQI
10th Jul 2025453 PMAQI
10th Jul 2025454 PMAQI
10th Jul 2025455 PMAQI
10th Jul 2025446 PMAQI
10th Jul 2025427 PMAQI
10th Jul 2025408 PMAQI
10th Jul 2025369 PMAQI
10th Jul 20253810 PMAQI
10th Jul 20253811 PMAQI
11th Jul 20254012 AMAQI
11th Jul 2025411 AMAQI
11th Jul 2025472 AMAQI
11th Jul 2025463 AMAQI
11th Jul 2025474 AMAQI

22°C16/27°C

11th Jul 2025465 AMAQI
11th Jul 2025486 AMAQI
11th Jul 2025447 AMAQI
11th Jul 2025468 AMAQI
11th Jul 2025499 AMAQI
11th Jul 20254810 AMAQI
11th Jul 20254811 AMAQI
11th Jul 20255012 PMAQI
11th Jul 2025491 PMAQI
11th Jul 2025492 PMAQI
11th Jul 2025503 PMAQI
11th Jul 2025504 PMAQI
11th Jul 2025505 PMAQI
11th Jul 2025486 PMAQI
11th Jul 2025467 PMAQI
11th Jul 2025498 PMAQI
11th Jul 2025489 PMAQI
11th Jul 20254610 PMAQI
11th Jul 20254711 PMAQI
12th Jul 20254612 AMAQI
12th Jul 2025481 AMAQI
12th Jul 2025482 AMAQI
12th Jul 2025443 AMAQI
12th Jul 2025444 AMAQI

22°C16/29°C

12th Jul 2025445 AMAQI
12th Jul 2025426 AMAQI
12th Jul 2025417 AMAQI
12th Jul 2025418 AMAQI
12th Jul 2025439 AMAQI
12th Jul 20254310 AMAQI
12th Jul 20254211 AMAQI
12th Jul 20254012 PMAQI
12th Jul 2025421 PMAQI
12th Jul 2025422 PMAQI
12th Jul 2025453 PMAQI
12th Jul 2025444 PMAQI
12th Jul 2025465 PMAQI
12th Jul 2025476 PMAQI
12th Jul 2025467 PMAQI
12th Jul 2025468 PMAQI
12th Jul 2025449 PMAQI
12th Jul 20254610 PMAQI
12th Jul 20254511 PMAQI
13th Jul 20254612 AMAQI
13th Jul 2025481 AMAQI
13th Jul 2025432 AMAQI
13th Jul 2025423 AMAQI
13th Jul 2025404 AMAQI

26°C20/34°C

13th Jul 2025405 AMAQI
13th Jul 2025426 AMAQI
13th Jul 2025437 AMAQI
13th Jul 2025448 AMAQI
13th Jul 2025439 AMAQI
13th Jul 20254310 AMAQI
13th Jul 20254311 AMAQI
13th Jul 20254312 PMAQI
13th Jul 2025421 PMAQI
13th Jul 2025412 PMAQI
13th Jul 2025403 PMAQI
13th Jul 2025404 PMAQI
13th Jul 2025425 PMAQI
13th Jul 2025466 PMAQI
13th Jul 2025527 PMAQI
13th Jul 2025528 PMAQI
13th Jul 2025469 PMAQI
13th Jul 20254510 PMAQI
13th Jul 20254411 PMAQI
14th Jul 20254512 AMAQI
14th Jul 2025461 AMAQI
14th Jul 2025502 AMAQI
14th Jul 2025453 AMAQI
14th Jul 2025474 AMAQI

24°C20/29°C

14th Jul 2025435 AMAQI
14th Jul 2025386 AMAQI
14th Jul 2025407 AMAQI
14th Jul 2025448 AMAQI
14th Jul 2025489 AMAQI
14th Jul 20254610 AMAQI
14th Jul 20254611 AMAQI
14th Jul 20254812 PMAQI
14th Jul 2025481 PMAQI
14th Jul 2025452 PMAQI
14th Jul 2025463 PMAQI
14th Jul 2025474 PMAQI
14th Jul 2025475 PMAQI
14th Jul 2025476 PMAQI
14th Jul 2025477 PMAQI
14th Jul 2025468 PMAQI
14th Jul 2025459 PMAQI
14th Jul 20254810 PMAQI
14th Jul 20254811 PMAQI
15th Jul 20254812 AMAQI
15th Jul 2025471 AMAQI
15th Jul 2025572 AMAQI
15th Jul 2025623 AMAQI
15th Jul 2025644 AMAQI

24°C17/31°C

15th Jul 2025655 AMAQI
15th Jul 2025686 AMAQI
15th Jul 2025667 AMAQI
15th Jul 2025668 AMAQI
15th Jul 2025609 AMAQI
15th Jul 20255910 AMAQI
15th Jul 20256011 AMAQI
15th Jul 20255912 PMAQI
15th Jul 2025601 PMAQI
15th Jul 2025602 PMAQI
15th Jul 2025603 PMAQI
15th Jul 2025604 PMAQI
15th Jul 2025605 PMAQI
15th Jul 2025606 PMAQI
15th Jul 2025607 PMAQI
15th Jul 2025608 PMAQI
15th Jul 2025599 PMAQI
15th Jul 20256010 PMAQI
15th Jul 20256011 PMAQI
16th Jul 20255912 AMAQI
16th Jul 2025601 AMAQI
16th Jul 2025682 AMAQI
16th Jul 2025713 AMAQI
16th Jul 2025724 AMAQI

24°C15/33°C

16th Jul 2025755 AMAQI
16th Jul 2025756 AMAQI
16th Jul 2025747 AMAQI
16th Jul 2025728 AMAQI
16th Jul 2025709 AMAQI
16th Jul 20257310 AMAQI
16th Jul 20257011 AMAQI
16th Jul 20256912 PMAQI
16th Jul 2025681 PMAQI
16th Jul 2025692 PMAQI
16th Jul 2025703 PMAQI
16th Jul 2025664 PMAQI
16th Jul 2025635 PMAQI
16th Jul 2025646 PMAQI
16th Jul 2025657 PMAQI
16th Jul 2025658 PMAQI
16th Jul 2025649 PMAQI
16th Jul 20256310 PMAQI
16th Jul 20255911 PMAQI
17th Jul 20255812 AMAQI
17th Jul 2025601 AMAQI
17th Jul 2025422 AMAQI
17th Jul 2025483 AMAQI
17th Jul 2025484 AMAQI

24°C17/33°C

17th Jul 2025465 AMAQI
17th Jul 2025456 AMAQI
17th Jul 2025427 AMAQI
17th Jul 2025418 AMAQI
17th Jul 2025449 AMAQI
17th Jul 20254210 AMAQI
17th Jul 20254111 AMAQI
17th Jul 20254412 PMAQI
17th Jul 2025521 PMAQI
17th Jul 2025482 PMAQI
17th Jul 2025383 PMAQI
17th Jul 2025384 PMAQI
17th Jul 2025385 PMAQI
17th Jul 2025426 PMAQI
17th Jul 2025427 PMAQI
17th Jul 2025438 PMAQI
17th Jul 2025419 PMAQI
17th Jul 20254010 PMAQI
17th Jul 20253211 PMAQI
18th Jul 20253312 AMAQI
18th Jul 2025301 AMAQI
18th Jul 2025212 AMAQI
18th Jul 2025203 AMAQI
18th Jul 2025204 AMAQI

21°C16/24°C

18th Jul 2025205 AMAQI
18th Jul 2025216 AMAQI
18th Jul 2025217 AMAQI
18th Jul 2025228 AMAQI
18th Jul 2025209 AMAQI
18th Jul 20252110 AMAQI
18th Jul 20252011 AMAQI
18th Jul 20252012 PMAQI
18th Jul 2025201 PMAQI
18th Jul 2025212 PMAQI
18th Jul 2025223 PMAQI
18th Jul 2025234 PMAQI
18th Jul 2025225 PMAQI
18th Jul 2025246 PMAQI
18th Jul 2025247 PMAQI
18th Jul 2025268 PMAQI
18th Jul 2025219 PMAQI
18th Jul 20252110 PMAQI
18th Jul 20252411 PMAQI
19th Jul 20252612 AMAQI
19th Jul 2025261 AMAQI
19th Jul 2025402 AMAQI
19th Jul 2025483 AMAQI
19th Jul 2025484 AMAQI

17°C9/23°C

19th Jul 2025445 AMAQI
19th Jul 2025376 AMAQI
19th Jul 2025327 AMAQI
19th Jul 2025298 AMAQI
19th Jul 2025319 AMAQI
19th Jul 20253210 AMAQI
19th Jul 20253111 AMAQI
19th Jul 20252812 PMAQI
19th Jul 2025281 PMAQI
19th Jul 2025262 PMAQI
19th Jul 2025283 PMAQI
19th Jul 2025284 PMAQI
19th Jul 2025295 PMAQI
19th Jul 2025286 PMAQI
19th Jul 2025287 PMAQI
19th Jul 2025288 PMAQI
19th Jul 2025309 PMAQI
19th Jul 20253010 PMAQI
19th Jul 20252811 PMAQI
20th Jul 20252812 AMAQI
20th Jul 2025271 AMAQI
20th Jul 2025222 AMAQI
20th Jul 2025223 AMAQI
20th Jul 2025244 AMAQI

20°C11/29°C

20th Jul 2025245 AMAQI
20th Jul 2025226 AMAQI
20th Jul 2025227 AMAQI
20th Jul 2025248 AMAQI
20th Jul 2025239 AMAQI
20th Jul 20252210 AMAQI
20th Jul 20252011 AMAQI
20th Jul 20252012 PMAQI
20th Jul 2025201 PMAQI
20th Jul 2025212 PMAQI
20th Jul 2025233 PMAQI
20th Jul 2025214 PMAQI
20th Jul 2025215 PMAQI
20th Jul 2025226 PMAQI
20th Jul 2025227 PMAQI
20th Jul 2025238 PMAQI
20th Jul 2025249 PMAQI
20th Jul 20252610 PMAQI
20th Jul 20253311 PMAQI
21st Jul 20253412 AMAQI
21st Jul 2025351 AMAQI
21st Jul 2025452 AMAQI
21st Jul 2025563 AMAQI
21st Jul 2025604 AMAQI

21°C14/26°C

21st Jul 2025625 AMAQI
21st Jul 2025606 AMAQI
21st Jul 2025607 AMAQI
21st Jul 2025568 AMAQI
21st Jul 2025499 AMAQI
21st Jul 20254210 AMAQI
21st Jul 20253711 AMAQI
21st Jul 20253412 PMAQI
21st Jul 2025331 PMAQI
21st Jul 2025332 PMAQI
21st Jul 2025303 PMAQI
21st Jul 2025324 PMAQI
21st Jul 2025385 PMAQI
21st Jul 2025386 PMAQI
21st Jul 2025377 PMAQI
21st Jul 2025368 PMAQI
21st Jul 2025429 PMAQI
21st Jul 20254310 PMAQI
21st Jul 20253611 PMAQI
22nd Jul 20253712 AMAQI
22nd Jul 2025341 AMAQI
22nd Jul 2025312 AMAQI
22nd Jul 2025193 AMAQI
22nd Jul 2025204 AMAQI

17°C11/22°C

22nd Jul 2025195 AMAQI
22nd Jul 2025186 AMAQI
22nd Jul 2025187 AMAQI
22nd Jul 2025188 AMAQI
22nd Jul 2025189 AMAQI
22nd Jul 20251910 AMAQI
22nd Jul 20251811 AMAQI
22nd Jul 20251912 PMAQI
22nd Jul 2025191 PMAQI
22nd Jul 2025222 PMAQI
22nd Jul 2025223 PMAQI
22nd Jul 2025224 PMAQI
22nd Jul 2025225 PMAQI
22nd Jul 2025226 PMAQI
22nd Jul 2025227 PMAQI
22nd Jul 2025228 PMAQI
22nd Jul 2025229 PMAQI
22nd Jul 20252110 PMAQI
22nd Jul 20252311 PMAQI
23rd Jul 20252212 AMAQI
23rd Jul 2025221 AMAQI
23rd Jul 2025212 AMAQI
23rd Jul 2025213 AMAQI
23rd Jul 2025224 AMAQI

17°C9/23°C

23rd Jul 2025225 AMAQI
23rd Jul 2025216 AMAQI
23rd Jul 2025227 AMAQI
23rd Jul 2025228 AMAQI
23rd Jul 2025229 AMAQI
23rd Jul 20252210 AMAQI
23rd Jul 20252211 AMAQI
23rd Jul 20252312 PMAQI
23rd Jul 2025221 PMAQI
23rd Jul 2025232 PMAQI
23rd Jul 2025213 PMAQI
23rd Jul 2025224 PMAQI
23rd Jul 2025235 PMAQI
23rd Jul 2025256 PMAQI
23rd Jul 2025237 PMAQI
23rd Jul 2025248 PMAQI
23rd Jul 2025239 PMAQI
23rd Jul 20252410 PMAQI
23rd Jul 20252511 PMAQI
24th Jul 20252512 AMAQI
24th Jul 2025241 AMAQI
24th Jul 2025242 AMAQI
24th Jul 2025263 AMAQI
24th Jul 2025284 AMAQI

21°C12/31°C

24th Jul 2025285 AMAQI
24th Jul 2025266 AMAQI
24th Jul 2025267 AMAQI
24th Jul 2025288 AMAQI
24th Jul 2025309 AMAQI
24th Jul 20253310 AMAQI
24th Jul 20254011 AMAQI
24th Jul 20254412 PMAQI
24th Jul 2025471 PMAQI
24th Jul 2025502 PMAQI
24th Jul 2025473 PMAQI
24th Jul 2025444 PMAQI
24th Jul 2025435 PMAQI
24th Jul 2025456 PMAQI
24th Jul 2025447 PMAQI
24th Jul 2025428 PMAQI
24th Jul 2025389 PMAQI
24th Jul 20253710 PMAQI
24th Jul 20253611 PMAQI
25th Jul 20253312 AMAQI
25th Jul 2025321 AMAQI
25th Jul 2025312 AMAQI
25th Jul 2025303 AMAQI
25th Jul 2025314 AMAQI

25°C15/35°C

25th Jul 2025335 AMAQI
25th Jul 2025356 AMAQI
25th Jul 2025367 AMAQI
25th Jul 2025388 AMAQI
25th Jul 2025369 AMAQI
25th Jul 20253310 AMAQI
25th Jul 20253211 AMAQI
25th Jul 20253112 PMAQI
25th Jul 2025321 PMAQI
25th Jul 2025322 PMAQI
25th Jul 2025303 PMAQI
25th Jul 2025344 PMAQI
25th Jul 2025385 PMAQI
25th Jul 2025396 PMAQI
25th Jul 2025387 PMAQI
25th Jul 2025408 PMAQI
25th Jul 2025399 PMAQI
25th Jul 20253810 PMAQI
25th Jul 20253911 PMAQI
26th Jul 20253512 AMAQI
26th Jul 2025361 AMAQI
26th Jul 2025572 AMAQI
26th Jul 2025603 AMAQI
26th Jul 2025624 AMAQI

24°C21/28°C

26th Jul 2025645 AMAQI
26th Jul 2025646 AMAQI
26th Jul 2025627 AMAQI
26th Jul 2025598 AMAQI
26th Jul 2025669 AMAQI
26th Jul 20256710 AMAQI
26th Jul 20256811 AMAQI
26th Jul 20256612 PMAQI
26th Jul 2025611 PMAQI
26th Jul 2025602 PMAQI
26th Jul 2025583 PMAQI
26th Jul 2025564 PMAQI
26th Jul 2025575 PMAQI
26th Jul 2025566 PMAQI
26th Jul 2025557 PMAQI
26th Jul 2025548 PMAQI
26th Jul 2025589 PMAQI
26th Jul 20255910 PMAQI
26th Jul 20255211 PMAQI
27th Jul 20255112 AMAQI
27th Jul 2025481 AMAQI
27th Jul 2025362 AMAQI
27th Jul 2025423 AMAQI
27th Jul 2025394 AMAQI

22°C16/29°C

27th Jul 2025385 AMAQI
27th Jul 2025366 AMAQI
27th Jul 2025357 AMAQI
27th Jul 2025368 AMAQI
27th Jul 2025379 AMAQI
27th Jul 20253710 AMAQI
27th Jul 20253811 AMAQI
27th Jul 20254212 PMAQI
27th Jul 2025431 PMAQI
27th Jul 2025402 PMAQI
27th Jul 2025403 PMAQI
27th Jul 2025414 PMAQI
27th Jul 2025445 PMAQI
27th Jul 2025446 PMAQI
27th Jul 2025447 PMAQI
27th Jul 2025448 PMAQI
27th Jul 2025429 PMAQI
27th Jul 20254310 PMAQI
27th Jul 20254911 PMAQI
28th Jul 20254712 AMAQI
28th Jul 2025501 AMAQI
28th Jul 2025522 AMAQI
28th Jul 2025523 AMAQI
28th Jul 2025524 AMAQI

25°C19/32°C

28th Jul 2025505 AMAQI
28th Jul 2025506 AMAQI
28th Jul 2025497 AMAQI
28th Jul 2025478 AMAQI
28th Jul 2025519 AMAQI
28th Jul 20254910 AMAQI
28th Jul 20255511 AMAQI
28th Jul 20255512 PMAQI
28th Jul 2025541 PMAQI
28th Jul 2025532 PMAQI
28th Jul 2025523 PMAQI
28th Jul 2025534 PMAQI
28th Jul 2025525 PMAQI
28th Jul 2025526 PMAQI
28th Jul 2025527 PMAQI
28th Jul 2025528 PMAQI
28th Jul 2025529 PMAQI
28th Jul 20255210 PMAQI
28th Jul 20255011 PMAQI
29th Jul 20255012 AMAQI
29th Jul 2025501 AMAQI
29th Jul 2025482 AMAQI
29th Jul 2025503 AMAQI
29th Jul 2025494 AMAQI

24°C14/34°C

29th Jul 2025475 AMAQI
29th Jul 2025426 AMAQI
29th Jul 2025377 AMAQI
29th Jul 2025378 AMAQI
29th Jul 2025419 AMAQI
29th Jul 20254110 AMAQI
29th Jul 20254211 AMAQI
29th Jul 20253812 PMAQI
29th Jul 2025381 PMAQI
29th Jul 2025362 PMAQI
29th Jul 2025363 PMAQI
29th Jul 2025384 PMAQI
29th Jul 2025425 PMAQI
29th Jul 2025416 PMAQI
29th Jul 2025427 PMAQI
29th Jul 2025408 PMAQI
29th Jul 2025439 PMAQI
29th Jul 20254210 PMAQI
29th Jul 20254011 PMAQI
30th Jul 20254012 AMAQI
30th Jul 2025421 AMAQI
30th Jul 2025432 AMAQI
30th Jul 2025453 AMAQI
30th Jul 2025454 AMAQI

25°C19/33°C

30th Jul 2025445 AMAQI
30th Jul 2025446 AMAQI
30th Jul 2025457 AMAQI
30th Jul 2025458 AMAQI
30th Jul 2025489 AMAQI
30th Jul 20254710 AMAQI
30th Jul 20254611 AMAQI
30th Jul 20254912 PMAQI
30th Jul 2025521 PMAQI
30th Jul 2025532 PMAQI
30th Jul 2025533 PMAQI
30th Jul 2025554 PMAQI
30th Jul 2025555 PMAQI
30th Jul 2025556 PMAQI
30th Jul 2025557 PMAQI
30th Jul 2025558 PMAQI
30th Jul 2025559 PMAQI
30th Jul 20255510 PMAQI
30th Jul 20255211 PMAQI
31st Jul 20255012 AMAQI
31st Jul 2025541 AMAQI
31st Jul 2025602 AMAQI
31st Jul 2025683 AMAQI
31st Jul 2025864 AMAQI

23°C17/28°C

31st Jul 2025805 AMAQI
31st Jul 2025786 AMAQI
31st Jul 2025807 AMAQI
31st Jul 20251068 AMAQI
31st Jul 20251159 AMAQI
31st Jul 202510210 AMAQI
31st Jul 20256711 AMAQI
31st Jul 202510612 PMAQI
31st Jul 20251421 PMAQI
31st Jul 20251522 PMAQI
31st Jul 20251423 PMAQI
31st Jul 20251344 PMAQI
31st Jul 20251205 PMAQI
31st Jul 2025966 PMAQI
31st Jul 2025867 PMAQI
31st Jul 2025928 PMAQI
31st Jul 20251299 PMAQI
31st Jul 202510310 PMAQI
31st Jul 20258811 PMAQI
1st Aug 20258812 AMAQI
1st Aug 2025901 AMAQI
1st Aug 2025882 AMAQI
1st Aug 2025723 AMAQI
1st Aug 2025754 AMAQI

19°C14/24°C

1st Aug 2025715 AMAQI
1st Aug 2025656 AMAQI
1st Aug 2025657 AMAQI
1st Aug 2025648 AMAQI
1st Aug 2025629 AMAQI
1st Aug 20255810 AMAQI
1st Aug 20255211 AMAQI
1st Aug 20254412 PMAQI
1st Aug 2025351 PMAQI
1st Aug 2025372 PMAQI
1st Aug 2025323 PMAQI
1st Aug 2025414 PMAQI
1st Aug 2025285 PMAQI
1st Aug 2025296 PMAQI
1st Aug 2025257 PMAQI
1st Aug 2025308 PMAQI
1st Aug 2025429 PMAQI
1st Aug 20253410 PMAQI
1st Aug 20252311 PMAQI
2nd Aug 20252612 AMAQI
2nd Aug 2025261 AMAQI
2nd Aug 2025262 AMAQI
2nd Aug 2025363 AMAQI
2nd Aug 2025354 AMAQI

17°C9/25°C

2nd Aug 2025325 AMAQI
5 AM
2nd Aug 2025306 AMAQI
2nd Aug 2025327 AMAQI
2nd Aug 2025328 AMAQI
2nd Aug 2025329 AMAQI
2nd Aug 20253110 AMAQI
2nd Aug 20253311 AMAQI
2nd Aug 20253912 PMAQI
12 PM
2nd Aug 2025301 PMAQI
2nd Aug 2025312 PMAQI
2nd Aug 2025393 PMAQI
2nd Aug 2025514 PMAQI
2nd Aug 2025615 PMAQI
2nd Aug 2025706 PMAQI
2nd Aug 2025787 PMAQI
2nd Aug 2025808 PMAQI
8 PM
2nd Aug 2025489 PMAQI
12 AM
4 AM

18°C9/26°C

Day time
Avg. Highest Time
5 AM - 8 PM

44AQI

16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM

44AQI

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. 44), while the lowest AQI was between 5 AM to 8 PM (Avg. 44).
Night time
Avg. Highest Time
12 AM - 11 PM

43AQI

8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM

43AQI

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. 43), while the lowest AQI was between 12 AM to 11 PM (Avg. 43).

2025 Days Vs Air Quality

Guelph, Ontario, Canada

2025

88%

188

12%

25

Total number of days with different AQI categories in last 215 days in 2025 (150 days remaining)

Good
188 Days
Moderate
25 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 88%

Health Risk Level:

Low

In 2025, 88% of 215 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

Guelph, Ontario, 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
21AQI
2nd January 2025
21AQI
3rd January 2025
23AQI
4th January 2025
28AQI
5th January 2025
27AQI
6th January 2025
23AQI
7th January 2025
24AQI
8th January 2025
28AQI
9th January 2025
29AQI
10th January 2025
45AQI
11th January 2025
62AQI
12th January 2025
45AQI
13th January 2025
36AQI
14th January 2025
26AQI
15th January 2025
24AQI
16th January 2025
49AQI
17th January 2025
37AQI
18th January 2025
30AQI
19th January 2025
26AQI
20th January 2025
25AQI
21st January 2025
24AQI
22nd January 2025
30AQI
23rd January 2025
41AQI
24th January 2025
26AQI
25th January 2025
48AQI
26th January 2025
31AQI
27th January 2025
27AQI
28th January 2025
29AQI
29th January 2025
28AQI
30th January 2025
25AQI
31st January 2025
53AQI
1st February 2025
27AQI
2nd February 2025
28AQI
3rd February 2025
55AQI
4th February 2025
27AQI
5th February 2025
25AQI
6th February 2025
33AQI
7th February 2025
28AQI
8th February 2025
37AQI
9th February 2025
32AQI
10th February 2025
29AQI
11th February 2025
40AQI
12th February 2025
27AQI
13th February 2025
26AQI
14th February 2025
30AQI
15th February 2025
33AQI
16th February 2025
28AQI
17th February 2025
28AQI
18th February 2025
27AQI
19th February 2025
25AQI
20th February 2025
22AQI
21st February 2025
28AQI
22nd February 2025
49AQI
23rd February 2025
59AQI
24th February 2025
54AQI
25th February 2025
61AQI
26th February 2025
32AQI
27th February 2025
38AQI
28th February 2025
26AQI
1st March 2025
30AQI
2nd March 2025
28AQI
3rd March 2025
31AQI
4th March 2025
36AQI
5th March 2025
37AQI
6th March 2025
27AQI
7th March 2025
32AQI
8th March 2025
32AQI
9th March 2025
30AQI
10th March 2025
32AQI
11th March 2025
31AQI
12th March 2025
26AQI
13th March 2025
29AQI
14th March 2025
54AQI
15th March 2025
56AQI
16th March 2025
26AQI
17th March 2025
15AQI
18th March 2025
24AQI
19th March 2025
31AQI
20th March 2025
24AQI
21st March 2025
17AQI
22nd March 2025
17AQI
23rd March 2025
19AQI
24th March 2025
20AQI
25th March 2025
18AQI
26th March 2025
19AQI
27th March 2025
27AQI
28th March 2025
24AQI
29th March 2025
30AQI
30th March 2025
22AQI
31st March 2025
21AQI
1st April 2025
16AQI
2nd April 2025
17AQI
3rd April 2025
22AQI
4th April 2025
17AQI
5th April 2025
19AQI
6th April 2025
16AQI
7th April 2025
19AQI
8th April 2025
14AQI
9th April 2025
19AQI
10th April 2025
34AQI
11th April 2025
27AQI
12th April 2025
23AQI
13th April 2025
36AQI
14th April 2025
27AQI
15th April 2025
17AQI
16th April 2025
13AQI
17th April 2025
19AQI
18th April 2025
33AQI
19th April 2025
41AQI
20th April 2025
16AQI
21st April 2025
20AQI
22nd April 2025
14AQI
23rd April 2025
26AQI
24th April 2025
37AQI
25th April 2025
30AQI
26th April 2025
27AQI
27th April 2025
14AQI
28th April 2025
22AQI
29th April 2025
32AQI
30th April 2025
17AQI
1st May 2025
34AQI
2nd May 2025
28AQI
3rd May 2025
18AQI
4th May 2025
16AQI
5th May 2025
18AQI
6th May 2025
19AQI
7th May 2025
38AQI
8th May 2025
18AQI
9th May 2025
21AQI
10th May 2025
27AQI
11th May 2025
23AQI
12th May 2025
27AQI
13th May 2025
33AQI
14th May 2025
21AQI
15th May 2025
32AQI
16th May 2025
29AQI
17th May 2025
27AQI
18th May 2025
19AQI
19th May 2025
14AQI
20th May 2025
14AQI
21st May 2025
15AQI
22nd May 2025
12AQI
23rd May 2025
11AQI
24th May 2025
13AQI
25th May 2025
15AQI
26th May 2025
18AQI
27th May 2025
24AQI
28th May 2025
23AQI
29th May 2025
26AQI
30th May 2025
33AQI
31st May 2025
24AQI
1st June 2025
18AQI
2nd June 2025
23AQI
3rd June 2025
39AQI
4th June 2025
72AQI
5th June 2025
54AQI
6th June 2025
64AQI
7th June 2025
64AQI
8th June 2025
80AQI
9th June 2025
69AQI
10th June 2025
55AQI
11th June 2025
61AQI
12th June 2025
66AQI
13th June 2025
44AQI
14th June 2025
34AQI
15th June 2025
37AQI
16th June 2025
37AQI
17th June 2025
39AQI
18th June 2025
39AQI
19th June 2025
30AQI
20th June 2025
39AQI
21st June 2025
48AQI
22nd June 2025
49AQI
23rd June 2025
53AQI
24th June 2025
54AQI
25th June 2025
43AQI
26th June 2025
40AQI
27th June 2025
37AQI
28th June 2025
32AQI
29th June 2025
35AQI
30th June 2025
39AQI
1st July 2025
38AQI
2nd July 2025
38AQI
3rd July 2025
47AQI
4th July 2025
38AQI
5th July 2025
43AQI
6th July 2025
50AQI
7th July 2025
47AQI
8th July 2025
33AQI
9th July 2025
39AQI
10th July 2025
37AQI
11th July 2025
46AQI
12th July 2025
45AQI
13th July 2025
45AQI
14th July 2025
46AQI
15th July 2025
58AQI
16th July 2025
66AQI
17th July 2025
46AQI
18th July 2025
25AQI
19th July 2025
31AQI
20th July 2025
24AQI
21st July 2025
42AQI
22nd July 2025
23AQI
23rd July 2025
22AQI
24th July 2025
35AQI
25th July 2025
35AQI
26th July 2025
55AQI
27th July 2025
42AQI
28th July 2025
51AQI
29th July 2025
43AQI
30th July 2025
48AQI
31st July 2025
91AQI
1st August 2025
60AQI

32AQI

34AQI

28AQI

23AQI

22AQI

46AQI

43AQI

60AQI

No. of days

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

202533AQI

29
2
24
4
29
2
30
31
19
11
26
5
1
188
25

Highest AQI recorded in

August

60AQI

Lowest AQI recorded in

May

22AQI

202432AQI

26
5
26
3
31
30
31
28
30
1
24
7
27
3
29
2
30
30
1
342
22

Highest AQI recorded in

January

37AQI

Lowest AQI recorded in

November

25AQI

202341AQI

26
5
23
5
28
3
24
6
29
2
10
15
5
21
10
21
10
29
1
28
3
26
3
25
6
290
69
5

Highest AQI recorded in

June

68AQI

Lowest AQI recorded in

October

31AQI

202235AQI

29
2
20
1
26
5
30
31
26
4
22
2
1
27
1
28
3
20
10
27
4
287
32

Highest AQI recorded in

November

43AQI

Lowest AQI recorded in

August

19AQI

202136AQI

23
7
25
3
26
5
27
3
23
6
25
5
24
7
26
5
27
2
1
29
2
26
4
27
4
308
53
1

Highest AQI recorded in

July

40AQI

Lowest AQI recorded in

October

30AQI

202033AQI

11
2
21
18
26
4
29
2
29
2
26
4
30
1
26
4
24
7
240
26

Highest AQI recorded in

November

37AQI

Lowest AQI recorded in

October

26AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2023(Avg.)
41AQI
Least Polluted Year Recorded
2024(Avg.)
32AQI

Guelph's annual 2025 AQI (33) shows an average percentage change of -6.9% (improved AQI) compared to previous years: 2020 (33), 2021 (36), 2022 (35), 2023 (41), 2024 (32).