Waterloo, 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
Waterloo, Ontario, Canada
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Aug 2025
125AQILowest AQI recorded on
2nd Aug 2021
17AQISame Day Analysis (5th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 107 of Poor air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 5th Aug - 6th Aug 2025
Waterloo, Ontario, Canada
AQI
Day
Night
.
6 AM5th Aug 2025
8 PM
5 AM6th Aug 2025
Day time
Avg. Highest Time
8AM5th Aug
80AQI
Avg. Lowest Time
5PM5th Aug
66AQI
Night time
Avg. Highest Time
3AM6th Aug
94AQI
Avg. Lowest Time
12AM6th Aug
72AQI
In the last 24 hours,
Waterloo's AQI reached its highest point of 94 at 3 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 5th Aug and 6th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Waterloo, Ontario, Canada
JulAug
07th - 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 - 06th06th
Day
Night
7th Jul 2025486 AMAQI
7th Jul 2025527 AMAQI
7th Jul 2025508 AMAQI
7th Jul 2025509 AMAQI
7th Jul 20255010 AMAQI
7th Jul 20255011 AMAQI
7th Jul 20255112 PMAQI
7th Jul 2025511 PMAQI
7th Jul 2025512 PMAQI
7th Jul 2025503 PMAQI
7th Jul 2025514 PMAQI
7th Jul 2025505 PMAQI
7th Jul 2025516 PMAQI
7th Jul 2025497 PMAQI
7th Jul 2025508 PMAQI
7th Jul 2025509 PMAQI
7th Jul 20255010 PMAQI
7th Jul 20254911 PMAQI
8th Jul 20254912 AMAQI
8th Jul 2025481 AMAQI
8th Jul 2025482 AMAQI
8th Jul 2025483 AMAQI
8th Jul 2025454 AMAQI
8th Jul 2025435 AMAQI
22°C19/24°C
8th Jul 2025446 AMAQI
8th Jul 2025457 AMAQI
8th Jul 2025458 AMAQI
8th Jul 2025449 AMAQI
8th Jul 20254410 AMAQI
8th Jul 20254311 AMAQI
8th Jul 20253912 PMAQI
8th Jul 2025381 PMAQI
8th Jul 2025402 PMAQI
8th Jul 2025493 PMAQI
8th Jul 2025474 PMAQI
8th Jul 2025475 PMAQI
8th Jul 2025426 PMAQI
8th Jul 2025467 PMAQI
8th Jul 2025468 PMAQI
8th Jul 2025409 PMAQI
8th Jul 20254010 PMAQI
8th Jul 20254111 PMAQI
9th Jul 20254412 AMAQI
9th Jul 2025441 AMAQI
9th Jul 2025442 AMAQI
9th Jul 2025343 AMAQI
9th Jul 2025304 AMAQI
9th Jul 2025305 AMAQI
22°C18/25°C
9th Jul 2025286 AMAQI
9th Jul 2025337 AMAQI
9th Jul 2025308 AMAQI
9th Jul 2025339 AMAQI
9th Jul 20253810 AMAQI
9th Jul 20253911 AMAQI
9th Jul 20254012 PMAQI
9th Jul 2025441 PMAQI
9th Jul 2025412 PMAQI
9th Jul 2025403 PMAQI
9th Jul 2025394 PMAQI
9th Jul 2025405 PMAQI
9th Jul 2025396 PMAQI
9th Jul 2025387 PMAQI
9th Jul 2025388 PMAQI
9th Jul 2025369 PMAQI
9th Jul 20253910 PMAQI
9th Jul 20253811 PMAQI
10th Jul 20253712 AMAQI
10th Jul 2025371 AMAQI
10th Jul 2025342 AMAQI
10th Jul 2025363 AMAQI
10th Jul 2025384 AMAQI
10th Jul 2025335 AMAQI
20°C15/28°C
10th Jul 2025316 AMAQI
10th Jul 2025317 AMAQI
10th Jul 2025298 AMAQI
10th Jul 2025299 AMAQI
10th Jul 20252710 AMAQI
10th Jul 20252711 AMAQI
10th Jul 20253112 PMAQI
10th Jul 2025321 PMAQI
10th Jul 2025322 PMAQI
10th Jul 2025393 PMAQI
10th Jul 2025354 PMAQI
10th Jul 2025365 PMAQI
10th Jul 2025366 PMAQI
10th Jul 2025367 PMAQI
10th Jul 2025358 PMAQI
10th Jul 2025359 PMAQI
10th Jul 20253610 PMAQI
10th Jul 20253811 PMAQI
11th Jul 20253812 AMAQI
11th Jul 2025381 AMAQI
11th Jul 2025382 AMAQI
11th Jul 2025343 AMAQI
11th Jul 2025294 AMAQI
11th Jul 2025285 AMAQI
23°C17/28°C
11th Jul 2025296 AMAQI
11th Jul 2025297 AMAQI
11th Jul 2025298 AMAQI
11th Jul 2025289 AMAQI
11th Jul 20253210 AMAQI
11th Jul 20253411 AMAQI
11th Jul 20253312 PMAQI
11th Jul 2025321 PMAQI
11th Jul 2025322 PMAQI
11th Jul 2025343 PMAQI
11th Jul 2025354 PMAQI
11th Jul 2025355 PMAQI
11th Jul 2025346 PMAQI
11th Jul 2025337 PMAQI
11th Jul 2025338 PMAQI
11th Jul 2025359 PMAQI
11th Jul 20253410 PMAQI
11th Jul 20253511 PMAQI
12th Jul 20253412 AMAQI
12th Jul 2025321 AMAQI
12th Jul 2025332 AMAQI
12th Jul 2025323 AMAQI
12th Jul 2025314 AMAQI
12th Jul 2025355 AMAQI
23°C18/30°C
12th Jul 2025406 AMAQI
12th Jul 2025397 AMAQI
12th Jul 2025448 AMAQI
12th Jul 2025509 AMAQI
12th Jul 20256110 AMAQI
12th Jul 20255911 AMAQI
12th Jul 20255412 PMAQI
12th Jul 2025631 PMAQI
12th Jul 2025542 PMAQI
12th Jul 2025533 PMAQI
12th Jul 2025554 PMAQI
12th Jul 2025475 PMAQI
12th Jul 2025476 PMAQI
12th Jul 2025437 PMAQI
12th Jul 2025468 PMAQI
12th Jul 2025509 PMAQI
12th Jul 20255010 PMAQI
12th Jul 20255111 PMAQI
13th Jul 20255212 AMAQI
13th Jul 2025521 AMAQI
13th Jul 2025512 AMAQI
13th Jul 2025473 AMAQI
13th Jul 2025494 AMAQI
13th Jul 2025485 AMAQI
27°C21/35°C
13th Jul 2025546 AMAQI
13th Jul 2025527 AMAQI
13th Jul 2025538 AMAQI
13th Jul 2025539 AMAQI
13th Jul 20255410 AMAQI
13th Jul 20255311 AMAQI
13th Jul 20255612 PMAQI
13th Jul 2025581 PMAQI
13th Jul 2025542 PMAQI
13th Jul 2025533 PMAQI
13th Jul 2025554 PMAQI
13th Jul 2025575 PMAQI
13th Jul 2025576 PMAQI
13th Jul 2025577 PMAQI
13th Jul 2025568 PMAQI
13th Jul 2025569 PMAQI
13th Jul 20255610 PMAQI
13th Jul 20255711 PMAQI
14th Jul 20255812 AMAQI
14th Jul 2025581 AMAQI
14th Jul 2025592 AMAQI
14th Jul 2025613 AMAQI
14th Jul 2025624 AMAQI
14th Jul 2025635 AMAQI
25°C21/29°C
14th Jul 2025616 AMAQI
14th Jul 2025607 AMAQI
14th Jul 2025608 AMAQI
14th Jul 2025639 AMAQI
14th Jul 20256410 AMAQI
14th Jul 20256111 AMAQI
14th Jul 20256012 PMAQI
14th Jul 2025621 PMAQI
14th Jul 2025632 PMAQI
14th Jul 2025643 PMAQI
14th Jul 2025644 PMAQI
14th Jul 2025655 PMAQI
14th Jul 2025656 PMAQI
14th Jul 2025627 PMAQI
14th Jul 2025628 PMAQI
14th Jul 2025629 PMAQI
14th Jul 20256010 PMAQI
14th Jul 20255911 PMAQI
15th Jul 20255912 AMAQI
15th Jul 2025591 AMAQI
15th Jul 2025612 AMAQI
15th Jul 2025613 AMAQI
15th Jul 2025624 AMAQI
15th Jul 2025655 AMAQI
25°C19/32°C
15th Jul 2025706 AMAQI
15th Jul 2025717 AMAQI
15th Jul 2025688 AMAQI
15th Jul 2025679 AMAQI
15th Jul 20256510 AMAQI
15th Jul 20256411 AMAQI
15th Jul 20256012 PMAQI
15th Jul 2025581 PMAQI
15th Jul 2025602 PMAQI
15th Jul 2025613 PMAQI
15th Jul 2025594 PMAQI
15th Jul 2025595 PMAQI
15th Jul 2025596 PMAQI
15th Jul 2025617 PMAQI
15th Jul 2025618 PMAQI
15th Jul 2025599 PMAQI
15th Jul 20255910 PMAQI
15th Jul 20255911 PMAQI
16th Jul 20255912 AMAQI
16th Jul 2025581 AMAQI
16th Jul 2025592 AMAQI
16th Jul 2025423 AMAQI
16th Jul 2025414 AMAQI
16th Jul 2025435 AMAQI
25°C16/34°C
16th Jul 2025446 AMAQI
16th Jul 2025477 AMAQI
16th Jul 2025498 AMAQI
16th Jul 2025479 AMAQI
16th Jul 20254610 AMAQI
16th Jul 20254411 AMAQI
16th Jul 20254212 PMAQI
16th Jul 2025411 PMAQI
16th Jul 2025412 PMAQI
16th Jul 2025463 PMAQI
16th Jul 2025414 PMAQI
16th Jul 2025435 PMAQI
16th Jul 2025426 PMAQI
16th Jul 2025447 PMAQI
16th Jul 2025448 PMAQI
16th Jul 2025419 PMAQI
16th Jul 20254110 PMAQI
16th Jul 20254011 PMAQI
17th Jul 20254012 AMAQI
17th Jul 2025421 AMAQI
17th Jul 2025352 AMAQI
17th Jul 2025293 AMAQI
17th Jul 2025304 AMAQI
17th Jul 2025285 AMAQI
25°C18/33°C
17th Jul 2025276 AMAQI
17th Jul 2025247 AMAQI
17th Jul 2025258 AMAQI
17th Jul 2025259 AMAQI
17th Jul 20252510 AMAQI
17th Jul 20252511 AMAQI
17th Jul 20252912 PMAQI
17th Jul 2025311 PMAQI
17th Jul 2025282 PMAQI
17th Jul 2025243 PMAQI
17th Jul 2025254 PMAQI
17th Jul 2025285 PMAQI
17th Jul 2025276 PMAQI
17th Jul 2025267 PMAQI
17th Jul 2025268 PMAQI
17th Jul 2025269 PMAQI
17th Jul 20252910 PMAQI
17th Jul 20253111 PMAQI
18th Jul 20253212 AMAQI
18th Jul 2025311 AMAQI
18th Jul 2025272 AMAQI
18th Jul 2025213 AMAQI
18th Jul 2025184 AMAQI
18th Jul 2025215 AMAQI
21°C16/24°C
18th Jul 2025246 AMAQI
18th Jul 2025217 AMAQI
18th Jul 2025258 AMAQI
18th Jul 2025239 AMAQI
18th Jul 20252310 AMAQI
18th Jul 20252411 AMAQI
18th Jul 20252412 PMAQI
18th Jul 2025241 PMAQI
18th Jul 2025242 PMAQI
18th Jul 2025263 PMAQI
18th Jul 2025274 PMAQI
18th Jul 2025265 PMAQI
18th Jul 2025266 PMAQI
18th Jul 2025267 PMAQI
18th Jul 2025268 PMAQI
18th Jul 2025269 PMAQI
18th Jul 20252510 PMAQI
18th Jul 20252511 PMAQI
19th Jul 20252512 AMAQI
19th Jul 2025271 AMAQI
19th Jul 2025302 AMAQI
19th Jul 2025343 AMAQI
19th Jul 2025364 AMAQI
19th Jul 2025335 AMAQI
18°C10/25°C
19th Jul 2025326 AMAQI
19th Jul 2025287 AMAQI
19th Jul 2025258 AMAQI
19th Jul 2025249 AMAQI
19th Jul 20252410 AMAQI
19th Jul 20252311 AMAQI
19th Jul 20252212 PMAQI
19th Jul 2025211 PMAQI
19th Jul 2025212 PMAQI
19th Jul 2025243 PMAQI
19th Jul 2025234 PMAQI
19th Jul 2025245 PMAQI
19th Jul 2025246 PMAQI
19th Jul 2025247 PMAQI
19th Jul 2025238 PMAQI
19th Jul 2025249 PMAQI
19th Jul 20252510 PMAQI
19th Jul 20252311 PMAQI
20th Jul 20252212 AMAQI
20th Jul 2025201 AMAQI
20th Jul 2025202 AMAQI
20th Jul 2025183 AMAQI
20th Jul 2025204 AMAQI
20th Jul 2025225 AMAQI
21°C13/30°C
20th Jul 2025196 AMAQI
20th Jul 2025217 AMAQI
20th Jul 2025218 AMAQI
20th Jul 2025199 AMAQI
20th Jul 20251710 AMAQI
20th Jul 20251711 AMAQI
20th Jul 20251812 PMAQI
20th Jul 2025171 PMAQI
20th Jul 2025202 PMAQI
20th Jul 2025203 PMAQI
20th Jul 2025224 PMAQI
20th Jul 2025205 PMAQI
20th Jul 2025226 PMAQI
20th Jul 2025207 PMAQI
20th Jul 2025208 PMAQI
20th Jul 2025229 PMAQI
20th Jul 20252310 PMAQI
20th Jul 20252611 PMAQI
21st Jul 20252812 AMAQI
21st Jul 2025301 AMAQI
21st Jul 2025392 AMAQI
21st Jul 2025403 AMAQI
21st Jul 2025434 AMAQI
21st Jul 2025505 AMAQI
22°C16/27°C
21st Jul 2025546 AMAQI
21st Jul 2025527 AMAQI
21st Jul 2025538 AMAQI
21st Jul 2025569 AMAQI
21st Jul 20255810 AMAQI
21st Jul 20255611 AMAQI
21st Jul 20255012 PMAQI
21st Jul 2025501 PMAQI
21st Jul 2025512 PMAQI
21st Jul 2025503 PMAQI
21st Jul 2025504 PMAQI
21st Jul 2025535 PMAQI
21st Jul 2025526 PMAQI
21st Jul 2025487 PMAQI
21st Jul 2025488 PMAQI
21st Jul 2025539 PMAQI
21st Jul 20255310 PMAQI
21st Jul 20255011 PMAQI
22nd Jul 20254812 AMAQI
22nd Jul 2025471 AMAQI
22nd Jul 2025442 AMAQI
22nd Jul 2025423 AMAQI
22nd Jul 2025404 AMAQI
22nd Jul 2025385 AMAQI
18°C12/23°C
22nd Jul 2025406 AMAQI
22nd Jul 2025327 AMAQI
22nd Jul 2025318 AMAQI
22nd Jul 2025289 AMAQI
22nd Jul 20253010 AMAQI
22nd Jul 20253711 AMAQI
22nd Jul 20253712 PMAQI
22nd Jul 2025401 PMAQI
22nd Jul 2025422 PMAQI
22nd Jul 2025453 PMAQI
22nd Jul 2025434 PMAQI
22nd Jul 2025425 PMAQI
22nd Jul 2025436 PMAQI
22nd Jul 2025437 PMAQI
22nd Jul 2025438 PMAQI
22nd Jul 2025419 PMAQI
22nd Jul 20254110 PMAQI
22nd Jul 20254111 PMAQI
23rd Jul 20254212 AMAQI
23rd Jul 2025431 AMAQI
23rd Jul 2025402 AMAQI
23rd Jul 2025273 AMAQI
23rd Jul 2025244 AMAQI
23rd Jul 2025245 AMAQI
18°C11/24°C
23rd Jul 2025326 AMAQI
23rd Jul 2025347 AMAQI
23rd Jul 2025338 AMAQI
23rd Jul 2025349 AMAQI
23rd Jul 20254010 AMAQI
23rd Jul 20254111 AMAQI
23rd Jul 20254112 PMAQI
23rd Jul 2025411 PMAQI
23rd Jul 2025392 PMAQI
23rd Jul 2025393 PMAQI
23rd Jul 2025384 PMAQI
23rd Jul 2025375 PMAQI
23rd Jul 2025376 PMAQI
23rd Jul 2025367 PMAQI
23rd Jul 2025388 PMAQI
23rd Jul 2025399 PMAQI
23rd Jul 20254010 PMAQI
23rd Jul 20253811 PMAQI
24th Jul 20253812 AMAQI
24th Jul 2025371 AMAQI
24th Jul 2025322 AMAQI
24th Jul 2025273 AMAQI
24th Jul 2025224 AMAQI
24th Jul 2025225 AMAQI
22°C13/32°C
24th Jul 2025226 AMAQI
24th Jul 2025227 AMAQI
24th Jul 2025248 AMAQI
24th Jul 2025229 AMAQI
24th Jul 20252410 AMAQI
24th Jul 20252611 AMAQI
24th Jul 20252812 PMAQI
24th Jul 2025301 PMAQI
24th Jul 2025322 PMAQI
24th Jul 2025323 PMAQI
24th Jul 2025324 PMAQI
24th Jul 2025345 PMAQI
24th Jul 2025306 PMAQI
24th Jul 2025307 PMAQI
24th Jul 2025298 PMAQI
24th Jul 2025269 PMAQI
24th Jul 20252810 PMAQI
24th Jul 20252911 PMAQI
25th Jul 20252812 AMAQI
25th Jul 2025261 AMAQI
25th Jul 2025232 AMAQI
25th Jul 2025213 AMAQI
25th Jul 2025214 AMAQI
25th Jul 2025235 AMAQI
26°C17/36°C
25th Jul 2025226 AMAQI
25th Jul 2025247 AMAQI
25th Jul 2025258 AMAQI
25th Jul 2025239 AMAQI
25th Jul 20252210 AMAQI
25th Jul 20252211 AMAQI
25th Jul 20252312 PMAQI
25th Jul 2025261 PMAQI
25th Jul 2025242 PMAQI
25th Jul 2025293 PMAQI
25th Jul 2025294 PMAQI
25th Jul 2025295 PMAQI
25th Jul 2025366 PMAQI
25th Jul 2025287 PMAQI
25th Jul 2025298 PMAQI
25th Jul 2025289 PMAQI
25th Jul 20252810 PMAQI
25th Jul 20253011 PMAQI
26th Jul 20252612 AMAQI
26th Jul 2025281 AMAQI
26th Jul 2025472 AMAQI
26th Jul 2025373 AMAQI
26th Jul 2025394 AMAQI
26th Jul 2025375 AMAQI
25°C21/29°C
26th Jul 2025406 AMAQI
26th Jul 2025457 AMAQI
26th Jul 2025448 AMAQI
26th Jul 2025449 AMAQI
26th Jul 20254410 AMAQI
26th Jul 20254311 AMAQI
26th Jul 20254112 PMAQI
26th Jul 2025371 PMAQI
26th Jul 2025412 PMAQI
26th Jul 2025443 PMAQI
26th Jul 2025414 PMAQI
26th Jul 2025405 PMAQI
26th Jul 2025406 PMAQI
26th Jul 2025417 PMAQI
26th Jul 2025448 PMAQI
26th Jul 2025429 PMAQI
26th Jul 20254010 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253812 AMAQI
27th Jul 2025361 AMAQI
27th Jul 2025282 AMAQI
27th Jul 2025303 AMAQI
27th Jul 2025254 AMAQI
27th Jul 2025255 AMAQI
23°C17/30°C
27th Jul 2025246 AMAQI
27th Jul 2025257 AMAQI
27th Jul 2025258 AMAQI
27th Jul 2025269 AMAQI
27th Jul 20252610 AMAQI
27th Jul 20252611 AMAQI
27th Jul 20252712 PMAQI
27th Jul 2025281 PMAQI
27th Jul 2025282 PMAQI
27th Jul 2025293 PMAQI
27th Jul 2025324 PMAQI
27th Jul 2025295 PMAQI
27th Jul 2025296 PMAQI
27th Jul 2025277 PMAQI
27th Jul 2025288 PMAQI
27th Jul 2025299 PMAQI
27th Jul 20253010 PMAQI
27th Jul 20253311 PMAQI
28th Jul 20253412 AMAQI
28th Jul 2025321 AMAQI
28th Jul 2025312 AMAQI
28th Jul 2025343 AMAQI
28th Jul 2025334 AMAQI
28th Jul 2025315 AMAQI
25°C21/33°C
28th Jul 2025306 AMAQI
28th Jul 2025317 AMAQI
28th Jul 2025308 AMAQI
28th Jul 2025309 AMAQI
28th Jul 20252910 AMAQI
28th Jul 20253011 AMAQI
28th Jul 20253112 PMAQI
28th Jul 2025311 PMAQI
28th Jul 2025312 PMAQI
28th Jul 2025333 PMAQI
28th Jul 2025334 PMAQI
28th Jul 2025325 PMAQI
28th Jul 2025336 PMAQI
28th Jul 2025327 PMAQI
28th Jul 2025338 PMAQI
28th Jul 2025359 PMAQI
28th Jul 20253410 PMAQI
28th Jul 20253411 PMAQI
29th Jul 20253712 AMAQI
29th Jul 2025371 AMAQI
29th Jul 2025382 AMAQI
29th Jul 2025363 AMAQI
29th Jul 2025364 AMAQI
29th Jul 2025375 AMAQI
25°C17/34°C
29th Jul 2025416 AMAQI
29th Jul 2025407 AMAQI
29th Jul 2025408 AMAQI
29th Jul 2025409 AMAQI
29th Jul 20254010 AMAQI
29th Jul 20254111 AMAQI
29th Jul 20254012 PMAQI
29th Jul 2025401 PMAQI
29th Jul 2025392 PMAQI
29th Jul 2025403 PMAQI
29th Jul 2025404 PMAQI
29th Jul 2025415 PMAQI
29th Jul 2025406 PMAQI
29th Jul 2025397 PMAQI
29th Jul 2025398 PMAQI
29th Jul 2025409 PMAQI
29th Jul 20253910 PMAQI
29th Jul 20253811 PMAQI
30th Jul 20254012 AMAQI
30th Jul 2025411 AMAQI
30th Jul 2025432 AMAQI
30th Jul 2025413 AMAQI
30th Jul 2025404 AMAQI
30th Jul 2025425 AMAQI
26°C19/34°C
30th Jul 2025416 AMAQI
30th Jul 2025427 AMAQI
30th Jul 2025438 AMAQI
30th Jul 2025459 AMAQI
30th Jul 20254610 AMAQI
30th Jul 20255011 AMAQI
30th Jul 20255412 PMAQI
30th Jul 2025541 PMAQI
30th Jul 2025432 PMAQI
30th Jul 2025433 PMAQI
30th Jul 2025464 PMAQI
30th Jul 2025455 PMAQI
30th Jul 2025436 PMAQI
30th Jul 2025457 PMAQI
30th Jul 2025458 PMAQI
30th Jul 2025539 PMAQI
30th Jul 20255610 PMAQI
30th Jul 20255311 PMAQI
31st Jul 20255412 AMAQI
31st Jul 2025601 AMAQI
31st Jul 2025812 AMAQI
31st Jul 2025923 AMAQI
31st Jul 20251104 AMAQI
31st Jul 2025995 AMAQI
24°C18/29°C
31st Jul 2025826 AMAQI
31st Jul 2025907 AMAQI
31st Jul 20251208 AMAQI
31st Jul 20251159 AMAQI
31st Jul 202512810 AMAQI
31st Jul 20259911 AMAQI
31st Jul 202511112 PMAQI
31st Jul 20251441 PMAQI
31st Jul 20251472 PMAQI
31st Jul 20251273 PMAQI
31st Jul 20251254 PMAQI
31st Jul 20251135 PMAQI
31st Jul 20251116 PMAQI
31st Jul 2025987 PMAQI
31st Jul 20251088 PMAQI
31st Jul 20251249 PMAQI
31st Jul 202510410 PMAQI
31st Jul 202510311 PMAQI
1st Aug 202510312 AMAQI
1st Aug 20251061 AMAQI
1st Aug 2025912 AMAQI
1st Aug 2025963 AMAQI
1st Aug 2025944 AMAQI
1st Aug 2025965 AMAQI
19°C15/24°C
1st Aug 2025886 AMAQI
1st Aug 2025807 AMAQI
1st Aug 2025818 AMAQI
1st Aug 2025849 AMAQI
1st Aug 20258110 AMAQI
1st Aug 20257011 AMAQI
1st Aug 20257112 PMAQI
1st Aug 2025781 PMAQI
1st Aug 2025852 PMAQI
1st Aug 2025833 PMAQI
1st Aug 2025784 PMAQI
1st Aug 2025785 PMAQI
1st Aug 2025766 PMAQI
1st Aug 2025887 PMAQI
1st Aug 2025868 PMAQI
1st Aug 2025819 PMAQI
1st Aug 20257710 PMAQI
1st Aug 20257611 PMAQI
2nd Aug 20258212 AMAQI
2nd Aug 2025731 AMAQI
2nd Aug 2025742 AMAQI
2nd Aug 2025773 AMAQI
2nd Aug 2025754 AMAQI
2nd Aug 2025775 AMAQI
18°C11/24°C
2nd Aug 2025746 AMAQI
2nd Aug 2025747 AMAQI
2nd Aug 2025778 AMAQI
2nd Aug 2025789 AMAQI
2nd Aug 20257910 AMAQI
2nd Aug 20258211 AMAQI
2nd Aug 20257912 PMAQI
2nd Aug 2025741 PMAQI
2nd Aug 2025752 PMAQI
2nd Aug 2025743 PMAQI
2nd Aug 2025774 PMAQI
2nd Aug 2025775 PMAQI
2nd Aug 2025796 PMAQI
2nd Aug 2025877 PMAQI
2nd Aug 2025898 PMAQI
2nd Aug 2025759 PMAQI
2nd Aug 20258210 PMAQI
2nd Aug 20259711 PMAQI
3rd Aug 20259712 AMAQI
3rd Aug 2025971 AMAQI
3rd Aug 20251022 AMAQI
3rd Aug 20251043 AMAQI
3rd Aug 2025974 AMAQI
3rd Aug 2025955 AMAQI
20°C11/28°C
3rd Aug 2025896 AMAQI
3rd Aug 2025977 AMAQI
3rd Aug 2025948 AMAQI
3rd Aug 2025919 AMAQI
3rd Aug 20258410 AMAQI
3rd Aug 20258111 AMAQI
3rd Aug 20258512 PMAQI
3rd Aug 2025911 PMAQI
3rd Aug 2025902 PMAQI
3rd Aug 2025943 PMAQI
3rd Aug 2025884 PMAQI
3rd Aug 2025955 PMAQI
3rd Aug 2025896 PMAQI
3rd Aug 2025937 PMAQI
3rd Aug 2025848 PMAQI
3rd Aug 2025889 PMAQI
3rd Aug 20259710 PMAQI
3rd Aug 20259611 PMAQI
4th Aug 20259712 AMAQI
4th Aug 2025991 AMAQI
4th Aug 2025942 AMAQI
4th Aug 2025983 AMAQI
4th Aug 20251004 AMAQI
4th Aug 20251025 AMAQI
22°C14/29°C
4th Aug 2025996 AMAQI
4th Aug 20251067 AMAQI
4th Aug 20251018 AMAQI
4th Aug 20251029 AMAQI
4th Aug 202510810 AMAQI
4th Aug 202511411 AMAQI
4th Aug 202510812 PMAQI
4th Aug 20251001 PMAQI
4th Aug 2025912 PMAQI
4th Aug 2025893 PMAQI
4th Aug 2025864 PMAQI
4th Aug 2025835 PMAQI
4th Aug 2025806 PMAQI
4th Aug 2025927 PMAQI
4th Aug 2025798 PMAQI
4th Aug 2025869 PMAQI
4th Aug 20257710 PMAQI
4th Aug 20257411 PMAQI
5th Aug 20257212 AMAQI
5th Aug 2025751 AMAQI
5th Aug 2025822 AMAQI
5th Aug 2025843 AMAQI
5th Aug 2025824 AMAQI
5th Aug 2025815 AMAQI
22°C14/30°C
5th Aug 2025776 AMAQI
5th Aug 2025787 AMAQI
5th Aug 2025808 AMAQI
5th Aug 2025789 AMAQI
5th Aug 20258010 AMAQI
5th Aug 20257711 AMAQI
5th Aug 20257312 PMAQI
5th Aug 2025701 PMAQI
5th Aug 2025672 PMAQI
5th Aug 2025663 PMAQI
5th Aug 2025694 PMAQI
5th Aug 2025665 PMAQI
5th Aug 2025676 PMAQI
5th Aug 2025747 PMAQI
5th Aug 2025718 PMAQI
5th Aug 2025739 PMAQI
5th Aug 20257410 PMAQI
5th Aug 20257211 PMAQI
6th Aug 20257212 AMAQI
6th Aug 2025771 AMAQI
6th Aug 2025852 AMAQI
6th Aug 2025943 AMAQI
6th Aug 2025944 AMAQI
22°C16/29°C
6 AM
1 PM
8 PM
1 AM
5 AM
--°C/°C
Day time
Avg. Highest Time
6 AM - 8 PM
49AQI
15 hours / Day
450 hours / Month
Avg. Lowest Time
6 AM - 8 PM
49AQI
15 hours / Day
450 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 8 PM (Avg. 49), while the lowest AQI was between 6 AM to 8 PM (Avg. 49).
Night time
Avg. Highest Time
12 AM - 11 PM
49AQI
9 hours / Day
270 hours / Month
Avg. Lowest Time
12 AM - 11 PM
49AQI
9 hours / Day
270 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 49), while the lowest AQI was between 12 AM to 11 PM (Avg. 49).
2025 Days Vs Air Quality
Waterloo, Ontario, Canada
2025
86%
186
13%
28
1%
3
Total number of days with different AQI categories in last 218 days in 2025 (147 days remaining)
Good
186 DaysModerate
28 DaysPoor
3 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2025, 86% of 218 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
Waterloo, 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
21AQI
2nd January 2025
21AQI
21AQI
3rd January 2025
24AQI
24AQI
4th January 2025
28AQI
28AQI
5th January 2025
27AQI
27AQI
6th January 2025
23AQI
23AQI
7th January 2025
24AQI
24AQI
8th January 2025
28AQI
28AQI
9th January 2025
29AQI
29AQI
10th January 2025
46AQI
46AQI
11th January 2025
63AQI
63AQI
12th January 2025
46AQI
46AQI
13th January 2025
38AQI
38AQI
14th January 2025
25AQI
25AQI
15th January 2025
24AQI
24AQI
16th January 2025
50AQI
50AQI
17th January 2025
38AQI
38AQI
18th January 2025
29AQI
29AQI
19th January 2025
27AQI
27AQI
20th January 2025
25AQI
25AQI
21st January 2025
24AQI
24AQI
22nd January 2025
31AQI
31AQI
23rd January 2025
40AQI
40AQI
24th January 2025
26AQI
26AQI
25th January 2025
49AQI
49AQI
26th January 2025
31AQI
31AQI
27th January 2025
27AQI
27AQI
28th January 2025
29AQI
29AQI
29th January 2025
28AQI
28AQI
30th January 2025
25AQI
25AQI
31st January 2025
54AQI
54AQI
1st February 2025
27AQI
27AQI
2nd February 2025
31AQI
31AQI
3rd February 2025
55AQI
55AQI
4th February 2025
27AQI
27AQI
5th February 2025
24AQI
24AQI
6th February 2025
33AQI
33AQI
7th February 2025
28AQI
28AQI
8th February 2025
38AQI
38AQI
9th February 2025
34AQI
34AQI
10th February 2025
29AQI
29AQI
11th February 2025
39AQI
39AQI
12th February 2025
26AQI
26AQI
13th February 2025
27AQI
27AQI
14th February 2025
30AQI
30AQI
15th February 2025
33AQI
33AQI
16th February 2025
29AQI
29AQI
17th February 2025
28AQI
28AQI
18th February 2025
27AQI
27AQI
19th February 2025
25AQI
25AQI
20th February 2025
22AQI
22AQI
21st February 2025
28AQI
28AQI
22nd February 2025
51AQI
51AQI
23rd February 2025
59AQI
59AQI
24th February 2025
54AQI
54AQI
25th February 2025
59AQI
59AQI
26th February 2025
32AQI
32AQI
27th February 2025
41AQI
41AQI
28th February 2025
26AQI
26AQI
1st March 2025
30AQI
30AQI
2nd March 2025
28AQI
28AQI
3rd March 2025
32AQI
32AQI
4th March 2025
36AQI
36AQI
5th March 2025
39AQI
39AQI
6th March 2025
27AQI
27AQI
7th March 2025
32AQI
32AQI
8th March 2025
33AQI
33AQI
9th March 2025
30AQI
30AQI
10th March 2025
31AQI
31AQI
11th March 2025
31AQI
31AQI
12th March 2025
27AQI
27AQI
13th March 2025
31AQI
31AQI
14th March 2025
57AQI
57AQI
15th March 2025
57AQI
57AQI
16th March 2025
25AQI
25AQI
17th March 2025
16AQI
16AQI
18th March 2025
24AQI
24AQI
19th March 2025
33AQI
33AQI
20th March 2025
24AQI
24AQI
21st March 2025
17AQI
17AQI
22nd March 2025
17AQI
17AQI
23rd March 2025
19AQI
19AQI
24th March 2025
21AQI
21AQI
25th March 2025
18AQI
18AQI
26th March 2025
18AQI
18AQI
27th March 2025
25AQI
25AQI
28th March 2025
28AQI
28AQI
29th March 2025
37AQI
37AQI
30th March 2025
23AQI
23AQI
31st March 2025
21AQI
21AQI
1st April 2025
17AQI
17AQI
2nd April 2025
17AQI
17AQI
3rd April 2025
23AQI
23AQI
4th April 2025
18AQI
18AQI
5th April 2025
19AQI
19AQI
6th April 2025
17AQI
17AQI
7th April 2025
19AQI
19AQI
8th April 2025
14AQI
14AQI
9th April 2025
18AQI
18AQI
10th April 2025
32AQI
32AQI
11th April 2025
29AQI
29AQI
12th April 2025
24AQI
24AQI
13th April 2025
37AQI
37AQI
14th April 2025
28AQI
28AQI
15th April 2025
17AQI
17AQI
16th April 2025
13AQI
13AQI
17th April 2025
19AQI
19AQI
18th April 2025
37AQI
37AQI
19th April 2025
40AQI
40AQI
20th April 2025
17AQI
17AQI
21st April 2025
22AQI
22AQI
22nd April 2025
14AQI
14AQI
23rd April 2025
34AQI
34AQI
24th April 2025
39AQI
39AQI
25th April 2025
35AQI
35AQI
26th April 2025
27AQI
27AQI
27th April 2025
15AQI
15AQI
28th April 2025
23AQI
23AQI
29th April 2025
33AQI
33AQI
30th April 2025
17AQI
17AQI
1st May 2025
33AQI
33AQI
2nd May 2025
30AQI
30AQI
3rd May 2025
18AQI
18AQI
4th May 2025
17AQI
17AQI
5th May 2025
19AQI
19AQI
6th May 2025
21AQI
21AQI
7th May 2025
36AQI
36AQI
8th May 2025
20AQI
20AQI
9th May 2025
21AQI
21AQI
10th May 2025
28AQI
28AQI
11th May 2025
25AQI
25AQI
12th May 2025
30AQI
30AQI
13th May 2025
37AQI
37AQI
14th May 2025
22AQI
22AQI
15th May 2025
31AQI
31AQI
16th May 2025
30AQI
30AQI
17th May 2025
28AQI
28AQI
18th May 2025
18AQI
18AQI
19th May 2025
15AQI
15AQI
20th May 2025
16AQI
16AQI
21st May 2025
17AQI
17AQI
22nd May 2025
12AQI
12AQI
23rd May 2025
11AQI
11AQI
24th May 2025
12AQI
12AQI
25th May 2025
17AQI
17AQI
26th May 2025
22AQI
22AQI
27th May 2025
28AQI
28AQI
28th May 2025
24AQI
24AQI
29th May 2025
29AQI
29AQI
30th May 2025
36AQI
36AQI
31st May 2025
28AQI
28AQI
1st June 2025
19AQI
19AQI
2nd June 2025
24AQI
24AQI
3rd June 2025
41AQI
41AQI
4th June 2025
73AQI
73AQI
5th June 2025
54AQI
54AQI
6th June 2025
64AQI
64AQI
7th June 2025
65AQI
65AQI
8th June 2025
82AQI
82AQI
9th June 2025
67AQI
67AQI
10th June 2025
56AQI
56AQI
11th June 2025
62AQI
62AQI
12th June 2025
67AQI
67AQI
13th June 2025
46AQI
46AQI
14th June 2025
35AQI
35AQI
15th June 2025
37AQI
37AQI
16th June 2025
38AQI
38AQI
17th June 2025
42AQI
42AQI
18th June 2025
40AQI
40AQI
19th June 2025
28AQI
28AQI
20th June 2025
38AQI
38AQI
21st June 2025
47AQI
47AQI
22nd June 2025
49AQI
49AQI
23rd June 2025
52AQI
52AQI
24th June 2025
55AQI
55AQI
25th June 2025
46AQI
46AQI
26th June 2025
40AQI
40AQI
27th June 2025
37AQI
37AQI
28th June 2025
32AQI
32AQI
29th June 2025
36AQI
36AQI
30th June 2025
40AQI
40AQI
1st July 2025
37AQI
37AQI
2nd July 2025
40AQI
40AQI
3rd July 2025
45AQI
45AQI
4th July 2025
40AQI
40AQI
5th July 2025
44AQI
44AQI
6th July 2025
51AQI
51AQI
7th July 2025
47AQI
47AQI
8th July 2025
34AQI
34AQI
9th July 2025
43AQI
43AQI
10th July 2025
38AQI
38AQI
11th July 2025
47AQI
47AQI
12th July 2025
44AQI
44AQI
13th July 2025
45AQI
45AQI
14th July 2025
46AQI
46AQI
15th July 2025
59AQI
59AQI
16th July 2025
67AQI
67AQI
17th July 2025
48AQI
48AQI
18th July 2025
25AQI
25AQI
19th July 2025
35AQI
35AQI
20th July 2025
24AQI
24AQI
21st July 2025
47AQI
47AQI
22nd July 2025
23AQI
23AQI
23rd July 2025
26AQI
26AQI
24th July 2025
36AQI
36AQI
25th July 2025
32AQI
32AQI
26th July 2025
57AQI
57AQI
27th July 2025
41AQI
41AQI
28th July 2025
51AQI
51AQI
29th July 2025
43AQI
43AQI
30th July 2025
51AQI
51AQI
31st July 2025
99AQI
99AQI
1st August 2025
54AQI
54AQI
2nd August 2025
44AQI
44AQI
3rd August 2025
105AQI
105AQI
4th August 2025
125AQI
125AQI
5th August 2025
107AQI
107AQI
32AQI
34AQI
29AQI
24AQI
24AQI
47AQI
44AQI
87AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202535AQI
29
2
23
5
29
2
30
31
19
11
24
7
1
1
3
186
28
3
Highest AQI recorded in
August87AQI
Lowest AQI recorded in
May24AQI
202433AQI
27
4
24
5
31
30
29
2
25
3
29
2
24
7
23
7
28
3
30
30
1
330
34
Highest AQI recorded in
January37AQI
Lowest AQI recorded in
November25AQI
202342AQI
24
7
22
6
25
6
25
5
29
2
10
14
6
21
10
19
12
28
2
29
2
25
4
24
7
281
77
6
Highest AQI recorded in
June72AQI
Lowest AQI recorded in
October30AQI
202235AQI
26
5
19
2
27
4
29
27
4
24
6
19
5
1
25
3
29
2
25
5
26
5
277
41
Highest AQI recorded in
June39AQI
Lowest AQI recorded in
August17AQI
202137AQI
24
5
1
25
3
27
4
28
2
25
6
25
5
23
8
23
8
26
4
28
3
25
5
27
4
306
57
1
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
October30AQI
202032AQI
11
2
21
18
29
1
31
31
28
2
31
26
4
25
6
251
15
Highest AQI recorded in
November35AQI
Lowest AQI recorded in
October24AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
42AQILeast Polluted Year Recorded
2020(Avg.)
32AQIWaterloo's annual 2025 AQI (35) shows an average percentage change of -2.1% (improved AQI) compared to previous years: 2020 (32), 2021 (37), 2022 (35), 2023 (42), 2024 (33).
