Thunder Bay, 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
Thunder Bay, Ontario, Canada
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
1st Aug 2025
157AQILowest AQI recorded on
9th Aug 2024
11AQISame Day Analysis (1st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 157 of Unhealthy air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 1st Aug - 2nd Aug 2025
Thunder Bay, Ontario, Canada
AQI
Day
Night
.
6 AM1st Aug 2025
9 PM
5 AM2nd Aug 2025
Day time
Avg. Highest Time
7PM1st Aug
165AQI
Avg. Lowest Time
11AM1st Aug
151AQI
Night time
Avg. Highest Time
12AM2nd Aug
160AQI
Avg. Lowest Time
11PM1st Aug
152AQI
In the last 24 hours,
Thunder Bay's AQI reached its highest point of 165 at 7 PM during the Day, while the lowest point, 151, was recorded at 11 AM during the Day between 1st Aug and 2nd Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Thunder Bay, 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 2025606 AMAQI
3rd Jul 2025527 AMAQI
3rd Jul 2025508 AMAQI
3rd Jul 2025459 AMAQI
3rd Jul 20254310 AMAQI
3rd Jul 20254211 AMAQI
3rd Jul 20254812 PMAQI
3rd Jul 2025441 PMAQI
3rd Jul 2025372 PMAQI
3rd Jul 2025383 PMAQI
3rd Jul 2025384 PMAQI
3rd Jul 2025375 PMAQI
3rd Jul 2025386 PMAQI
3rd Jul 2025387 PMAQI
3rd Jul 2025388 PMAQI
3rd Jul 2025399 PMAQI
3rd Jul 20254010 PMAQI
3rd Jul 20253611 PMAQI
4th Jul 20253612 AMAQI
4th Jul 2025361 AMAQI
4th Jul 2025302 AMAQI
4th Jul 2025303 AMAQI
4th Jul 2025294 AMAQI
4th Jul 2025315 AMAQI
16°C10/20°C
4th Jul 2025346 AMAQI
4th Jul 2025337 AMAQI
4th Jul 2025398 AMAQI
4th Jul 2025369 AMAQI
4th Jul 20253510 AMAQI
4th Jul 20253411 AMAQI
4th Jul 20253512 PMAQI
4th Jul 2025341 PMAQI
4th Jul 2025372 PMAQI
4th Jul 2025363 PMAQI
4th Jul 2025394 PMAQI
4th Jul 2025385 PMAQI
4th Jul 2025406 PMAQI
4th Jul 2025407 PMAQI
4th Jul 2025418 PMAQI
4th Jul 2025389 PMAQI
4th Jul 20253610 PMAQI
4th Jul 20253811 PMAQI
5th Jul 20253812 AMAQI
5th Jul 2025441 AMAQI
5th Jul 2025512 AMAQI
5th Jul 2025503 AMAQI
5th Jul 2025454 AMAQI
5th Jul 2025465 AMAQI
14°C10/21°C
5th Jul 2025466 AMAQI
5th Jul 2025507 AMAQI
5th Jul 2025528 AMAQI
5th Jul 2025509 AMAQI
5th Jul 20255010 AMAQI
5th Jul 20254711 AMAQI
5th Jul 20254812 PMAQI
5th Jul 2025481 PMAQI
5th Jul 2025402 PMAQI
5th Jul 2025403 PMAQI
5th Jul 2025384 PMAQI
5th Jul 2025405 PMAQI
5th Jul 2025386 PMAQI
5th Jul 2025377 PMAQI
5th Jul 2025378 PMAQI
5th Jul 2025409 PMAQI
5th Jul 20254210 PMAQI
5th Jul 20254111 PMAQI
6th Jul 20254212 AMAQI
6th Jul 2025461 AMAQI
6th Jul 2025462 AMAQI
6th Jul 2025473 AMAQI
6th Jul 2025364 AMAQI
6th Jul 2025545 AMAQI
18°C10/25°C
6th Jul 2025416 AMAQI
6th Jul 2025447 AMAQI
6th Jul 2025448 AMAQI
6th Jul 2025489 AMAQI
6th Jul 20255010 AMAQI
6th Jul 20254611 AMAQI
6th Jul 20254412 PMAQI
6th Jul 2025411 PMAQI
6th Jul 2025372 PMAQI
6th Jul 2025333 PMAQI
6th Jul 2025344 PMAQI
6th Jul 2025395 PMAQI
6th Jul 2025396 PMAQI
6th Jul 2025387 PMAQI
6th Jul 2025388 PMAQI
6th Jul 2025399 PMAQI
6th Jul 20253910 PMAQI
6th Jul 20253611 PMAQI
7th Jul 20253512 AMAQI
7th Jul 2025381 AMAQI
7th Jul 2025292 AMAQI
7th Jul 2025273 AMAQI
7th Jul 2025254 AMAQI
7th Jul 2025245 AMAQI
18°C13/23°C
7th Jul 2025236 AMAQI
7th Jul 2025247 AMAQI
7th Jul 2025268 AMAQI
7th Jul 2025269 AMAQI
7th Jul 20252610 AMAQI
7th Jul 20252611 AMAQI
7th Jul 20252512 PMAQI
7th Jul 2025301 PMAQI
7th Jul 2025292 PMAQI
7th Jul 2025293 PMAQI
7th Jul 2025304 PMAQI
7th Jul 2025295 PMAQI
7th Jul 2025306 PMAQI
7th Jul 2025307 PMAQI
7th Jul 2025328 PMAQI
7th Jul 2025279 PMAQI
7th Jul 20252710 PMAQI
7th Jul 20252611 PMAQI
8th Jul 20252812 AMAQI
8th Jul 2025251 AMAQI
8th Jul 2025272 AMAQI
8th Jul 2025283 AMAQI
8th Jul 2025344 AMAQI
8th Jul 2025265 AMAQI
15°C9/20°C
8th Jul 2025266 AMAQI
8th Jul 2025297 AMAQI
8th Jul 2025308 AMAQI
8th Jul 2025289 AMAQI
8th Jul 20252910 AMAQI
8th Jul 20253111 AMAQI
8th Jul 20252912 PMAQI
8th Jul 2025291 PMAQI
8th Jul 2025302 PMAQI
8th Jul 2025313 PMAQI
8th Jul 2025314 PMAQI
8th Jul 2025325 PMAQI
8th Jul 2025326 PMAQI
8th Jul 2025307 PMAQI
8th Jul 2025318 PMAQI
8th Jul 2025299 PMAQI
8th Jul 20253010 PMAQI
8th Jul 20252811 PMAQI
9th Jul 20252812 AMAQI
9th Jul 2025311 AMAQI
9th Jul 2025312 AMAQI
9th Jul 2025323 AMAQI
9th Jul 2025294 AMAQI
9th Jul 2025305 AMAQI
13°C10/17°C
9th Jul 2025306 AMAQI
9th Jul 2025307 AMAQI
9th Jul 2025298 AMAQI
9th Jul 2025309 AMAQI
9th Jul 20253010 AMAQI
9th Jul 20253011 AMAQI
9th Jul 20253012 PMAQI
9th Jul 2025311 PMAQI
9th Jul 2025292 PMAQI
9th Jul 2025283 PMAQI
9th Jul 2025294 PMAQI
9th Jul 2025325 PMAQI
9th Jul 2025326 PMAQI
9th Jul 2025307 PMAQI
9th Jul 2025328 PMAQI
9th Jul 2025309 PMAQI
9th Jul 20253010 PMAQI
9th Jul 20253011 PMAQI
10th Jul 20253012 AMAQI
10th Jul 2025321 AMAQI
10th Jul 2025322 AMAQI
10th Jul 2025333 AMAQI
10th Jul 2025324 AMAQI
10th Jul 2025295 AMAQI
15°C9/21°C
10th Jul 2025316 AMAQI
10th Jul 2025327 AMAQI
10th Jul 2025328 AMAQI
10th Jul 2025309 AMAQI
10th Jul 20253110 AMAQI
10th Jul 20253111 AMAQI
10th Jul 20253212 PMAQI
10th Jul 2025351 PMAQI
10th Jul 2025302 PMAQI
10th Jul 2025293 PMAQI
10th Jul 2025314 PMAQI
10th Jul 2025325 PMAQI
10th Jul 2025326 PMAQI
10th Jul 2025327 PMAQI
10th Jul 2025348 PMAQI
10th Jul 2025309 PMAQI
10th Jul 20253010 PMAQI
10th Jul 20253111 PMAQI
11th Jul 20253112 AMAQI
11th Jul 2025311 AMAQI
11th Jul 2025322 AMAQI
11th Jul 2025323 AMAQI
11th Jul 2025344 AMAQI
11th Jul 2025345 AMAQI
14°C8/20°C
11th Jul 2025306 AMAQI
11th Jul 2025327 AMAQI
11th Jul 2025328 AMAQI
11th Jul 2025329 AMAQI
11th Jul 20253310 AMAQI
11th Jul 20253711 AMAQI
11th Jul 20254512 PMAQI
11th Jul 2025441 PMAQI
11th Jul 2025342 PMAQI
11th Jul 2025343 PMAQI
11th Jul 2025344 PMAQI
11th Jul 2025345 PMAQI
11th Jul 2025356 PMAQI
11th Jul 2025357 PMAQI
11th Jul 2025368 PMAQI
11th Jul 2025349 PMAQI
11th Jul 20253210 PMAQI
11th Jul 20253211 PMAQI
12th Jul 20253112 AMAQI
12th Jul 2025321 AMAQI
12th Jul 2025322 AMAQI
12th Jul 2025323 AMAQI
12th Jul 2025324 AMAQI
12th Jul 2025345 AMAQI
16°C11/22°C
12th Jul 2025336 AMAQI
12th Jul 2025337 AMAQI
12th Jul 2025368 AMAQI
12th Jul 2025369 AMAQI
12th Jul 20253610 AMAQI
12th Jul 20253611 AMAQI
12th Jul 20253712 PMAQI
12th Jul 2025361 PMAQI
12th Jul 2025392 PMAQI
12th Jul 2025463 PMAQI
12th Jul 2025444 PMAQI
12th Jul 2025425 PMAQI
12th Jul 2025366 PMAQI
12th Jul 2025377 PMAQI
12th Jul 2025458 PMAQI
12th Jul 2025419 PMAQI
12th Jul 20253610 PMAQI
12th Jul 20253811 PMAQI
13th Jul 20253812 AMAQI
13th Jul 2025391 AMAQI
13th Jul 2025392 AMAQI
13th Jul 2025503 AMAQI
13th Jul 2025624 AMAQI
13th Jul 2025635 AMAQI
16°C11/22°C
13th Jul 2025606 AMAQI
13th Jul 2025547 AMAQI
13th Jul 2025508 AMAQI
13th Jul 2025529 AMAQI
13th Jul 20255510 AMAQI
13th Jul 20255611 AMAQI
13th Jul 20255812 PMAQI
13th Jul 2025561 PMAQI
13th Jul 2025572 PMAQI
13th Jul 2025593 PMAQI
13th Jul 2025584 PMAQI
13th Jul 2025615 PMAQI
13th Jul 2025606 PMAQI
13th Jul 2025607 PMAQI
13th Jul 2025668 PMAQI
13th Jul 2025609 PMAQI
13th Jul 20256010 PMAQI
13th Jul 20256411 PMAQI
14th Jul 20256512 AMAQI
14th Jul 2025661 AMAQI
14th Jul 2025702 AMAQI
14th Jul 2025633 AMAQI
14th Jul 2025584 AMAQI
14th Jul 2025645 AMAQI
22°C16/28°C
14th Jul 2025876 AMAQI
14th Jul 20251017 AMAQI
14th Jul 2025888 AMAQI
14th Jul 2025899 AMAQI
14th Jul 20259010 AMAQI
14th Jul 20258911 AMAQI
14th Jul 20259512 PMAQI
14th Jul 2025861 PMAQI
14th Jul 2025792 PMAQI
14th Jul 2025813 PMAQI
14th Jul 2025854 PMAQI
14th Jul 2025885 PMAQI
14th Jul 2025846 PMAQI
14th Jul 2025887 PMAQI
14th Jul 2025908 PMAQI
14th Jul 2025879 PMAQI
14th Jul 20258410 PMAQI
14th Jul 20258011 PMAQI
15th Jul 20258112 AMAQI
15th Jul 2025851 AMAQI
15th Jul 2025832 AMAQI
15th Jul 2025803 AMAQI
15th Jul 2025824 AMAQI
15th Jul 2025905 AMAQI
23°C18/30°C
15th Jul 2025906 AMAQI
15th Jul 2025857 AMAQI
15th Jul 2025878 AMAQI
15th Jul 2025909 AMAQI
15th Jul 20258810 AMAQI
15th Jul 20259011 AMAQI
15th Jul 20258912 PMAQI
15th Jul 2025881 PMAQI
15th Jul 2025882 PMAQI
15th Jul 2025873 PMAQI
15th Jul 2025804 PMAQI
15th Jul 2025805 PMAQI
15th Jul 2025846 PMAQI
15th Jul 2025827 PMAQI
15th Jul 2025828 PMAQI
15th Jul 2025829 PMAQI
15th Jul 20258010 PMAQI
15th Jul 20257611 PMAQI
16th Jul 20257512 AMAQI
16th Jul 2025741 AMAQI
16th Jul 2025642 AMAQI
16th Jul 2025553 AMAQI
16th Jul 2025424 AMAQI
16th Jul 2025395 AMAQI
16°C13/21°C
16th Jul 2025396 AMAQI
16th Jul 2025377 AMAQI
16th Jul 2025448 AMAQI
16th Jul 2025489 AMAQI
16th Jul 20254410 AMAQI
16th Jul 20254011 AMAQI
16th Jul 20254212 PMAQI
16th Jul 2025421 PMAQI
16th Jul 2025382 PMAQI
16th Jul 2025393 PMAQI
16th Jul 2025444 PMAQI
16th Jul 2025505 PMAQI
16th Jul 2025476 PMAQI
16th Jul 2025457 PMAQI
16th Jul 2025478 PMAQI
16th Jul 2025519 PMAQI
16th Jul 20255110 PMAQI
16th Jul 20254911 PMAQI
17th Jul 20254912 AMAQI
17th Jul 2025461 AMAQI
17th Jul 2025352 AMAQI
17th Jul 2025323 AMAQI
17th Jul 2025324 AMAQI
17th Jul 2025325 AMAQI
12°C10/14°C
17th Jul 2025326 AMAQI
17th Jul 2025327 AMAQI
17th Jul 2025318 AMAQI
17th Jul 2025319 AMAQI
17th Jul 20253010 AMAQI
17th Jul 20253111 AMAQI
17th Jul 20253412 PMAQI
17th Jul 2025421 PMAQI
17th Jul 2025492 PMAQI
17th Jul 2025503 PMAQI
17th Jul 2025414 PMAQI
17th Jul 2025365 PMAQI
17th Jul 2025396 PMAQI
17th Jul 2025377 PMAQI
17th Jul 2025358 PMAQI
17th Jul 2025329 PMAQI
17th Jul 20253210 PMAQI
17th Jul 20253811 PMAQI
18th Jul 20253712 AMAQI
18th Jul 2025391 AMAQI
18th Jul 2025502 AMAQI
18th Jul 2025543 AMAQI
18th Jul 2025564 AMAQI
18th Jul 2025565 AMAQI
17°C8/23°C
18th Jul 2025606 AMAQI
18th Jul 2025687 AMAQI
18th Jul 2025638 AMAQI
18th Jul 2025589 AMAQI
18th Jul 20255910 AMAQI
18th Jul 20256011 AMAQI
18th Jul 20256112 PMAQI
18th Jul 2025631 PMAQI
18th Jul 2025682 PMAQI
18th Jul 2025663 PMAQI
18th Jul 2025584 PMAQI
18th Jul 2025525 PMAQI
18th Jul 2025516 PMAQI
18th Jul 2025517 PMAQI
18th Jul 2025508 PMAQI
18th Jul 2025509 PMAQI
18th Jul 20255110 PMAQI
18th Jul 20254811 PMAQI
19th Jul 20254912 AMAQI
19th Jul 2025501 AMAQI
19th Jul 2025472 AMAQI
19th Jul 2025403 AMAQI
19th Jul 2025414 AMAQI
19th Jul 2025465 AMAQI
15°C10/20°C
19th Jul 2025396 AMAQI
19th Jul 2025387 AMAQI
19th Jul 2025448 AMAQI
19th Jul 2025449 AMAQI
19th Jul 20253910 AMAQI
19th Jul 20254011 AMAQI
19th Jul 20253812 PMAQI
19th Jul 2025351 PMAQI
19th Jul 2025362 PMAQI
19th Jul 2025363 PMAQI
19th Jul 2025394 PMAQI
19th Jul 2025395 PMAQI
19th Jul 2025386 PMAQI
19th Jul 2025417 PMAQI
19th Jul 2025418 PMAQI
19th Jul 2025429 PMAQI
19th Jul 20254610 PMAQI
19th Jul 20254611 PMAQI
20th Jul 20254312 AMAQI
20th Jul 2025441 AMAQI
20th Jul 2025522 AMAQI
20th Jul 2025553 AMAQI
20th Jul 2025664 AMAQI
20th Jul 2025665 AMAQI
16°C10/22°C
20th Jul 2025566 AMAQI
20th Jul 2025527 AMAQI
20th Jul 2025478 AMAQI
20th Jul 2025509 AMAQI
20th Jul 20255010 AMAQI
20th Jul 20255811 AMAQI
20th Jul 20256012 PMAQI
20th Jul 2025591 PMAQI
20th Jul 2025572 PMAQI
20th Jul 2025563 PMAQI
20th Jul 2025564 PMAQI
20th Jul 2025565 PMAQI
20th Jul 2025606 PMAQI
20th Jul 2025587 PMAQI
20th Jul 2025578 PMAQI
20th Jul 2025579 PMAQI
20th Jul 20255610 PMAQI
20th Jul 20255311 PMAQI
21st Jul 20255412 AMAQI
21st Jul 2025561 AMAQI
21st Jul 2025542 AMAQI
21st Jul 2025563 AMAQI
21st Jul 2025524 AMAQI
21st Jul 2025565 AMAQI
18°C13/23°C
21st Jul 2025476 AMAQI
21st Jul 2025507 AMAQI
21st Jul 2025528 AMAQI
21st Jul 2025549 AMAQI
21st Jul 20255510 AMAQI
21st Jul 20255611 AMAQI
21st Jul 20255612 PMAQI
21st Jul 2025601 PMAQI
21st Jul 2025592 PMAQI
21st Jul 2025573 PMAQI
21st Jul 2025554 PMAQI
21st Jul 2025545 PMAQI
21st Jul 2025566 PMAQI
21st Jul 2025557 PMAQI
21st Jul 2025548 PMAQI
21st Jul 2025549 PMAQI
21st Jul 20255410 PMAQI
21st Jul 20255411 PMAQI
22nd Jul 20255312 AMAQI
22nd Jul 2025541 AMAQI
22nd Jul 2025522 AMAQI
22nd Jul 2025463 AMAQI
22nd Jul 2025504 AMAQI
22nd Jul 2025465 AMAQI
16°C11/21°C
22nd Jul 2025436 AMAQI
22nd Jul 2025437 AMAQI
22nd Jul 2025488 AMAQI
22nd Jul 2025489 AMAQI
22nd Jul 20254910 AMAQI
22nd Jul 20255211 AMAQI
22nd Jul 20254912 PMAQI
22nd Jul 2025501 PMAQI
22nd Jul 2025512 PMAQI
22nd Jul 2025513 PMAQI
22nd Jul 2025534 PMAQI
22nd Jul 2025525 PMAQI
22nd Jul 2025536 PMAQI
22nd Jul 2025527 PMAQI
22nd Jul 2025528 PMAQI
22nd Jul 2025539 PMAQI
22nd Jul 20255210 PMAQI
22nd Jul 20255211 PMAQI
23rd Jul 20255312 AMAQI
23rd Jul 2025531 AMAQI
23rd Jul 2025562 AMAQI
23rd Jul 2025543 AMAQI
23rd Jul 2025544 AMAQI
23rd Jul 2025535 AMAQI
15°C12/22°C
23rd Jul 2025566 AMAQI
23rd Jul 2025547 AMAQI
23rd Jul 2025538 AMAQI
23rd Jul 2025529 AMAQI
23rd Jul 20255610 AMAQI
23rd Jul 20255511 AMAQI
23rd Jul 20255212 PMAQI
23rd Jul 2025511 PMAQI
23rd Jul 2025462 PMAQI
23rd Jul 2025443 PMAQI
23rd Jul 2025464 PMAQI
23rd Jul 2025525 PMAQI
23rd Jul 2025476 PMAQI
23rd Jul 2025507 PMAQI
23rd Jul 2025488 PMAQI
23rd Jul 2025539 PMAQI
23rd Jul 20255410 PMAQI
23rd Jul 20255211 PMAQI
24th Jul 20255312 AMAQI
24th Jul 2025541 AMAQI
24th Jul 2025472 AMAQI
24th Jul 2025523 AMAQI
24th Jul 2025524 AMAQI
24th Jul 2025485 AMAQI
17°C14/22°C
24th Jul 2025486 AMAQI
24th Jul 2025517 AMAQI
24th Jul 2025548 AMAQI
24th Jul 2025609 AMAQI
24th Jul 20255610 AMAQI
24th Jul 20255711 AMAQI
24th Jul 20255812 PMAQI
24th Jul 2025561 PMAQI
24th Jul 2025552 PMAQI
24th Jul 2025533 PMAQI
24th Jul 2025564 PMAQI
24th Jul 2025565 PMAQI
24th Jul 2025556 PMAQI
24th Jul 2025597 PMAQI
24th Jul 2025618 PMAQI
24th Jul 2025549 PMAQI
24th Jul 20255210 PMAQI
24th Jul 20255211 PMAQI
25th Jul 20255212 AMAQI
25th Jul 2025531 AMAQI
25th Jul 2025602 AMAQI
25th Jul 2025563 AMAQI
25th Jul 2025444 AMAQI
25th Jul 2025455 AMAQI
21°C16/28°C
25th Jul 2025406 AMAQI
25th Jul 2025447 AMAQI
25th Jul 2025518 AMAQI
25th Jul 2025559 AMAQI
25th Jul 20255510 AMAQI
25th Jul 20255711 AMAQI
25th Jul 20256312 PMAQI
25th Jul 2025601 PMAQI
25th Jul 2025592 PMAQI
25th Jul 2025593 PMAQI
25th Jul 2025584 PMAQI
25th Jul 2025575 PMAQI
25th Jul 2025586 PMAQI
25th Jul 2025547 PMAQI
25th Jul 2025548 PMAQI
25th Jul 2025549 PMAQI
25th Jul 20255410 PMAQI
25th Jul 20255411 PMAQI
26th Jul 20255312 AMAQI
26th Jul 2025541 AMAQI
26th Jul 2025522 AMAQI
26th Jul 2025573 AMAQI
26th Jul 2025654 AMAQI
26th Jul 2025645 AMAQI
19°C12/25°C
26th Jul 2025596 AMAQI
26th Jul 2025617 AMAQI
26th Jul 2025618 AMAQI
26th Jul 2025609 AMAQI
26th Jul 20256210 AMAQI
26th Jul 20256611 AMAQI
26th Jul 20256312 PMAQI
26th Jul 2025641 PMAQI
26th Jul 2025702 PMAQI
26th Jul 2025663 PMAQI
26th Jul 2025634 PMAQI
26th Jul 2025625 PMAQI
26th Jul 2025646 PMAQI
26th Jul 2025627 PMAQI
26th Jul 2025578 PMAQI
26th Jul 2025589 PMAQI
26th Jul 20255810 PMAQI
26th Jul 20255511 PMAQI
27th Jul 20255412 AMAQI
27th Jul 2025561 AMAQI
27th Jul 2025442 AMAQI
27th Jul 2025423 AMAQI
27th Jul 2025344 AMAQI
27th Jul 2025365 AMAQI
20°C12/27°C
27th Jul 2025376 AMAQI
27th Jul 2025347 AMAQI
27th Jul 2025368 AMAQI
27th Jul 2025409 AMAQI
27th Jul 20254010 AMAQI
27th Jul 20253811 AMAQI
27th Jul 20253812 PMAQI
27th Jul 2025381 PMAQI
27th Jul 2025382 PMAQI
27th Jul 2025373 PMAQI
27th Jul 2025384 PMAQI
27th Jul 2025425 PMAQI
27th Jul 2025446 PMAQI
27th Jul 2025447 PMAQI
27th Jul 2025428 PMAQI
27th Jul 2025429 PMAQI
27th Jul 20254210 PMAQI
27th Jul 20254211 PMAQI
28th Jul 20254212 AMAQI
28th Jul 2025411 AMAQI
28th Jul 2025322 AMAQI
28th Jul 2025303 AMAQI
28th Jul 2025284 AMAQI
28th Jul 2025275 AMAQI
20°C15/24°C
28th Jul 2025266 AMAQI
28th Jul 2025267 AMAQI
28th Jul 2025328 AMAQI
28th Jul 2025399 AMAQI
28th Jul 20254810 AMAQI
28th Jul 20255411 AMAQI
28th Jul 20255412 PMAQI
28th Jul 2025501 PMAQI
28th Jul 2025472 PMAQI
28th Jul 2025513 PMAQI
28th Jul 2025494 PMAQI
28th Jul 2025445 PMAQI
28th Jul 2025446 PMAQI
28th Jul 2025447 PMAQI
28th Jul 2025458 PMAQI
28th Jul 2025419 PMAQI
28th Jul 20254110 PMAQI
28th Jul 20254511 PMAQI
29th Jul 20254412 AMAQI
29th Jul 2025461 AMAQI
29th Jul 2025532 AMAQI
29th Jul 2025543 AMAQI
29th Jul 2025564 AMAQI
29th Jul 2025565 AMAQI
21°C14/28°C
29th Jul 2025546 AMAQI
29th Jul 2025567 AMAQI
29th Jul 2025588 AMAQI
29th Jul 2025589 AMAQI
29th Jul 20256010 AMAQI
29th Jul 20256211 AMAQI
29th Jul 20256212 PMAQI
29th Jul 2025641 PMAQI
29th Jul 2025682 PMAQI
29th Jul 2025643 PMAQI
29th Jul 2025764 PMAQI
29th Jul 2025605 PMAQI
29th Jul 2025666 PMAQI
29th Jul 2025647 PMAQI
29th Jul 2025658 PMAQI
29th Jul 2025569 PMAQI
29th Jul 20255710 PMAQI
29th Jul 20255711 PMAQI
30th Jul 20255712 AMAQI
30th Jul 2025591 AMAQI
30th Jul 2025592 AMAQI
30th Jul 2025723 AMAQI
30th Jul 2025684 AMAQI
30th Jul 2025665 AMAQI
21°C17/27°C
30th Jul 2025726 AMAQI
30th Jul 2025657 AMAQI
30th Jul 2025738 AMAQI
30th Jul 2025669 AMAQI
30th Jul 20256510 AMAQI
30th Jul 20256811 AMAQI
30th Jul 20256412 PMAQI
30th Jul 2025671 PMAQI
30th Jul 2025702 PMAQI
30th Jul 2025733 PMAQI
30th Jul 2025804 PMAQI
30th Jul 2025835 PMAQI
30th Jul 2025836 PMAQI
30th Jul 2025837 PMAQI
30th Jul 2025838 PMAQI
30th Jul 2025839 PMAQI
30th Jul 20258310 PMAQI
30th Jul 20257211 PMAQI
31st Jul 20256712 AMAQI
31st Jul 2025751 AMAQI
31st Jul 2025772 AMAQI
31st Jul 2025823 AMAQI
31st Jul 20251204 AMAQI
31st Jul 20251105 AMAQI
17°C11/22°C
31st Jul 20251096 AMAQI
31st Jul 20251127 AMAQI
31st Jul 20251478 AMAQI
31st Jul 20251489 AMAQI
31st Jul 202516010 AMAQI
31st Jul 202516011 AMAQI
31st Jul 202516012 PMAQI
31st Jul 20251581 PMAQI
31st Jul 20251592 PMAQI
31st Jul 20251623 PMAQI
31st Jul 20251584 PMAQI
31st Jul 20251585 PMAQI
31st Jul 20251626 PMAQI
31st Jul 20251587 PMAQI
31st Jul 20251608 PMAQI
31st Jul 20251539 PMAQI
31st Jul 202516210 PMAQI
31st Jul 202515411 PMAQI
1st Aug 202515912 AMAQI
1st Aug 20251571 AMAQI
1st Aug 20251582 AMAQI
1st Aug 20251463 AMAQI
1st Aug 20251594 AMAQI
1st Aug 20251605 AMAQI
16°C8/22°C
1st Aug 20251556 AMAQI
1st Aug 20251597 AMAQI
1st Aug 20251578 AMAQI
1st Aug 20251519 AMAQI
1st Aug 202515410 AMAQI
1st Aug 202515111 AMAQI
1st Aug 202515212 PMAQI
1st Aug 20251571 PMAQI
1st Aug 20251622 PMAQI
1st Aug 20251583 PMAQI
1st Aug 20251614 PMAQI
1st Aug 20251595 PMAQI
1st Aug 20251606 PMAQI
1st Aug 20251657 PMAQI
1st Aug 20251568 PMAQI
1st Aug 20251569 PMAQI
1st Aug 202515810 PMAQI
1st Aug 202515211 PMAQI
2nd Aug 202516012 AMAQI
2nd Aug 20251561 AMAQI
2nd Aug 20251542 AMAQI
2nd Aug 20251563 AMAQI
2nd Aug 20251564 AMAQI
2nd Aug 20251575 AMAQI
21°C12/29°C
2nd Aug 20251566 AMAQI
6 AM2nd Aug 20251577 AMAQI
2nd Aug 20251558 AMAQI
2nd Aug 20251579 AMAQI
2nd Aug 202515710 AMAQI
2nd Aug 202514311 AMAQI
2nd Aug 202514812 PMAQI
2nd Aug 20251481 PMAQI
1 PM2nd Aug 20251482 PMAQI
2nd Aug 20251383 PMAQI
2nd Aug 20251454 PMAQI
2nd Aug 20251425 PMAQI
9 PM
1 AM
5 AM
--°C/°C
Day time
Avg. Highest Time
6 AM - 9 PM
58AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
6 AM - 9 PM
58AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 9 PM (Avg. 58), while the lowest AQI was between 6 AM to 9 PM (Avg. 58).
Night time
Avg. Highest Time
12 AM - 11 PM
55AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
55AQI
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. 55), while the lowest AQI was between 12 AM to 11 PM (Avg. 55).
2025 Days Vs Air Quality
Thunder Bay, Ontario, Canada
2025
90%
192
9%
19
0.4%
1
0.4%
1
Total number of days with different AQI categories in last 214 days in 2025 (151 days remaining)
Good
192 DaysModerate
19 DaysPoor
1 DaysUnhealthy
1 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 214 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
Thunder Bay, 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
18AQI
18AQI
2nd January 2025
22AQI
22AQI
3rd January 2025
24AQI
24AQI
4th January 2025
26AQI
26AQI
5th January 2025
26AQI
26AQI
6th January 2025
24AQI
24AQI
7th January 2025
24AQI
24AQI
8th January 2025
24AQI
24AQI
9th January 2025
34AQI
34AQI
10th January 2025
41AQI
41AQI
11th January 2025
25AQI
25AQI
12th January 2025
23AQI
23AQI
13th January 2025
23AQI
23AQI
14th January 2025
25AQI
25AQI
15th January 2025
29AQI
29AQI
16th January 2025
26AQI
26AQI
17th January 2025
26AQI
26AQI
18th January 2025
26AQI
26AQI
19th January 2025
26AQI
26AQI
20th January 2025
24AQI
24AQI
21st January 2025
27AQI
27AQI
22nd January 2025
27AQI
27AQI
23rd January 2025
25AQI
25AQI
24th January 2025
28AQI
28AQI
25th January 2025
32AQI
32AQI
26th January 2025
28AQI
28AQI
27th January 2025
29AQI
29AQI
28th January 2025
24AQI
24AQI
29th January 2025
26AQI
26AQI
30th January 2025
27AQI
27AQI
31st January 2025
27AQI
27AQI
1st February 2025
25AQI
25AQI
2nd February 2025
28AQI
28AQI
3rd February 2025
27AQI
27AQI
4th February 2025
24AQI
24AQI
5th February 2025
23AQI
23AQI
6th February 2025
25AQI
25AQI
7th February 2025
26AQI
26AQI
8th February 2025
27AQI
27AQI
9th February 2025
29AQI
29AQI
10th February 2025
30AQI
30AQI
11th February 2025
36AQI
36AQI
12th February 2025
45AQI
45AQI
13th February 2025
28AQI
28AQI
14th February 2025
34AQI
34AQI
15th February 2025
26AQI
26AQI
16th February 2025
22AQI
22AQI
17th February 2025
22AQI
22AQI
18th February 2025
22AQI
22AQI
19th February 2025
27AQI
27AQI
20th February 2025
25AQI
25AQI
21st February 2025
28AQI
28AQI
22nd February 2025
32AQI
32AQI
23rd February 2025
34AQI
34AQI
24th February 2025
35AQI
35AQI
25th February 2025
25AQI
25AQI
26th February 2025
31AQI
31AQI
27th February 2025
24AQI
24AQI
28th February 2025
26AQI
26AQI
1st March 2025
29AQI
29AQI
2nd March 2025
29AQI
29AQI
3rd March 2025
37AQI
37AQI
4th March 2025
34AQI
34AQI
5th March 2025
28AQI
28AQI
6th March 2025
28AQI
28AQI
7th March 2025
27AQI
27AQI
8th March 2025
26AQI
26AQI
9th March 2025
30AQI
30AQI
10th March 2025
25AQI
25AQI
11th March 2025
29AQI
29AQI
12th March 2025
25AQI
25AQI
13th March 2025
25AQI
25AQI
14th March 2025
28AQI
28AQI
15th March 2025
63AQI
63AQI
16th March 2025
19AQI
19AQI
17th March 2025
23AQI
23AQI
18th March 2025
18AQI
18AQI
19th March 2025
25AQI
25AQI
20th March 2025
19AQI
19AQI
21st March 2025
21AQI
21AQI
22nd March 2025
26AQI
26AQI
23rd March 2025
26AQI
26AQI
24th March 2025
20AQI
20AQI
25th March 2025
24AQI
24AQI
26th March 2025
26AQI
26AQI
27th March 2025
18AQI
18AQI
28th March 2025
19AQI
19AQI
29th March 2025
16AQI
16AQI
30th March 2025
17AQI
17AQI
31st March 2025
17AQI
17AQI
1st April 2025
21AQI
21AQI
2nd April 2025
18AQI
18AQI
3rd April 2025
17AQI
17AQI
4th April 2025
22AQI
22AQI
5th April 2025
17AQI
17AQI
6th April 2025
18AQI
18AQI
7th April 2025
15AQI
15AQI
8th April 2025
16AQI
16AQI
9th April 2025
20AQI
20AQI
10th April 2025
29AQI
29AQI
11th April 2025
34AQI
34AQI
12th April 2025
36AQI
36AQI
13th April 2025
47AQI
47AQI
14th April 2025
29AQI
29AQI
15th April 2025
14AQI
14AQI
16th April 2025
16AQI
16AQI
17th April 2025
18AQI
18AQI
18th April 2025
23AQI
23AQI
19th April 2025
16AQI
16AQI
20th April 2025
20AQI
20AQI
21st April 2025
14AQI
14AQI
22nd April 2025
18AQI
18AQI
23rd April 2025
15AQI
15AQI
24th April 2025
15AQI
15AQI
25th April 2025
17AQI
17AQI
26th April 2025
17AQI
17AQI
27th April 2025
22AQI
22AQI
28th April 2025
25AQI
25AQI
29th April 2025
16AQI
16AQI
30th April 2025
15AQI
15AQI
1st May 2025
18AQI
18AQI
2nd May 2025
17AQI
17AQI
3rd May 2025
15AQI
15AQI
4th May 2025
16AQI
16AQI
5th May 2025
20AQI
20AQI
6th May 2025
26AQI
26AQI
7th May 2025
18AQI
18AQI
8th May 2025
17AQI
17AQI
9th May 2025
26AQI
26AQI
10th May 2025
20AQI
20AQI
11th May 2025
17AQI
17AQI
12th May 2025
26AQI
26AQI
13th May 2025
36AQI
36AQI
14th May 2025
33AQI
33AQI
15th May 2025
25AQI
25AQI
16th May 2025
24AQI
24AQI
17th May 2025
16AQI
16AQI
18th May 2025
17AQI
17AQI
19th May 2025
14AQI
14AQI
20th May 2025
14AQI
14AQI
21st May 2025
17AQI
17AQI
22nd May 2025
14AQI
14AQI
23rd May 2025
12AQI
12AQI
24th May 2025
15AQI
15AQI
25th May 2025
18AQI
18AQI
26th May 2025
19AQI
19AQI
27th May 2025
22AQI
22AQI
28th May 2025
23AQI
23AQI
29th May 2025
31AQI
31AQI
30th May 2025
29AQI
29AQI
31st May 2025
31AQI
31AQI
1st June 2025
29AQI
29AQI
2nd June 2025
30AQI
30AQI
3rd June 2025
49AQI
49AQI
4th June 2025
45AQI
45AQI
5th June 2025
55AQI
55AQI
6th June 2025
47AQI
47AQI
7th June 2025
59AQI
59AQI
8th June 2025
54AQI
54AQI
9th June 2025
59AQI
59AQI
10th June 2025
55AQI
55AQI
11th June 2025
61AQI
61AQI
12th June 2025
46AQI
46AQI
13th June 2025
30AQI
30AQI
14th June 2025
25AQI
25AQI
15th June 2025
28AQI
28AQI
16th June 2025
32AQI
32AQI
17th June 2025
30AQI
30AQI
18th June 2025
42AQI
42AQI
19th June 2025
36AQI
36AQI
20th June 2025
30AQI
30AQI
21st June 2025
33AQI
33AQI
22nd June 2025
33AQI
33AQI
23rd June 2025
33AQI
33AQI
24th June 2025
31AQI
31AQI
25th June 2025
38AQI
38AQI
26th June 2025
36AQI
36AQI
27th June 2025
27AQI
27AQI
28th June 2025
28AQI
28AQI
29th June 2025
26AQI
26AQI
30th June 2025
24AQI
24AQI
1st July 2025
31AQI
31AQI
2nd July 2025
39AQI
39AQI
3rd July 2025
38AQI
38AQI
4th July 2025
36AQI
36AQI
5th July 2025
43AQI
43AQI
6th July 2025
41AQI
41AQI
7th July 2025
29AQI
29AQI
8th July 2025
29AQI
29AQI
9th July 2025
30AQI
30AQI
10th July 2025
31AQI
31AQI
11th July 2025
34AQI
34AQI
12th July 2025
36AQI
36AQI
13th July 2025
54AQI
54AQI
14th July 2025
80AQI
80AQI
15th July 2025
84AQI
84AQI
16th July 2025
50AQI
50AQI
17th July 2025
38AQI
38AQI
18th July 2025
53AQI
53AQI
19th July 2025
42AQI
42AQI
20th July 2025
54AQI
54AQI
21st July 2025
54AQI
54AQI
22nd July 2025
50AQI
50AQI
23rd July 2025
52AQI
52AQI
24th July 2025
54AQI
54AQI
25th July 2025
54AQI
54AQI
26th July 2025
60AQI
60AQI
27th July 2025
42AQI
42AQI
28th July 2025
41AQI
41AQI
29th July 2025
57AQI
57AQI
30th July 2025
71AQI
71AQI
31st July 2025
129AQI
129AQI
1st August 2025
157AQI
157AQI
26AQI
28AQI
26AQI
21AQI
21AQI
38AQI
50AQI
157AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202531AQI
31
28
30
1
30
31
24
6
18
12
1
1
192
19
1
1
Highest AQI recorded in
August157AQI
Lowest AQI recorded in
April21AQI
202430AQI
31
28
1
31
30
30
1
29
27
4
26
5
23
1
2
4
31
30
31
347
12
2
4
Highest AQI recorded in
September57AQI
Lowest AQI recorded in
November18AQI
202329AQI
31
28
31
30
31
28
2
28
3
23
8
28
2
31
29
29
2
347
17
Highest AQI recorded in
August38AQI
Lowest AQI recorded in
October20AQI
202227AQI
31
21
31
30
31
30
22
2
2
29
31
29
1
30
1
317
4
Highest AQI recorded in
February30AQI
Lowest AQI recorded in
September21AQI
202131AQI
27
3
23
2
30
1
30
28
1
28
2
20
9
2
25
4
2
30
30
30
31
332
22
4
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
October20AQI
202027AQI
11
2
21
18
30
30
1
31
30
28
1
29
1
30
1
258
6
Highest AQI recorded in
March37AQI
Lowest AQI recorded in
August22AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2025(Avg.)
31AQILeast Polluted Year Recorded
2022(Avg.)
27AQIThunder Bay's annual 2025 AQI (31) shows an average percentage change of 6.7% (worsened AQI) compared to previous years: 2020 (27), 2021 (31), 2022 (27), 2023 (29), 2024 (30).
