Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

St Thomas, 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+

July Air Quality Analysis

St Thomas, Ontario, Canada

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
17th Jul 2026
212AQI
Lowest AQI recorded on
11th Jul 2022
19AQI

Same Day Analysis (29th July):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 24 of Good air quality, showing improvement over 2025, 2024 and 2023 on the same day.

Day & Night AQI Trend: 29th Jul - 30th Jul 2026

St Thomas, Ontario, Canada

AQI
Day
Night
.

6 AM29th Jul 2026

9 PM

5 AM30th Jul 2026

Day time
Avg. Highest Time
7AM29th Jul

25AQI

Avg. Lowest Time
3PM29th Jul

18AQI

Night time
Avg. Highest Time
4AM30th Jul

29AQI

Avg. Lowest Time
12AM30th Jul

17AQI

In the last 24 hours,

St Thomas's AQI reached its highest point of 29 at 4 AM during the Night, while the lowest point, 17, was recorded at 12 AM during the Night between 29th Jul and 30th Jul 2026.

Day & Night AQI Trend : Jul 2026

St Thomas, Ontario, Canada

Jul
01st - 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 - 30th30th
Day
Night
1st Jul 2026246 AMAQI
1st Jul 2026287 AMAQI
1st Jul 2026278 AMAQI
1st Jul 2026679 AMAQI
1st Jul 20266710 AMAQI
1st Jul 20266711 AMAQI
1st Jul 20267012 PMAQI
1st Jul 2026691 PMAQI
1st Jul 2026672 PMAQI
1st Jul 2026703 PMAQI
1st Jul 2026684 PMAQI
1st Jul 2026735 PMAQI
1st Jul 2026726 PMAQI
1st Jul 2026747 PMAQI
1st Jul 2026468 PMAQI
1st Jul 2026299 PMAQI
1st Jul 20262510 PMAQI
1st Jul 20262911 PMAQI
2nd Jul 20263112 AMAQI
2nd Jul 2026531 AMAQI
2nd Jul 2026692 AMAQI
2nd Jul 2026733 AMAQI
2nd Jul 2026734 AMAQI
2nd Jul 2026735 AMAQI

28°C23/34°C

2nd Jul 2026696 AMAQI
2nd Jul 2026697 AMAQI
2nd Jul 2026718 AMAQI
2nd Jul 2026679 AMAQI
2nd Jul 20266710 AMAQI
2nd Jul 20266611 AMAQI
2nd Jul 20266812 PMAQI
2nd Jul 2026701 PMAQI
2nd Jul 2026622 PMAQI
2nd Jul 2026583 PMAQI
2nd Jul 2026524 PMAQI
2nd Jul 2026515 PMAQI
2nd Jul 2026486 PMAQI
2nd Jul 2026567 PMAQI
2nd Jul 2026598 PMAQI
2nd Jul 2026469 PMAQI
2nd Jul 20264210 PMAQI
2nd Jul 20264211 PMAQI
3rd Jul 20264612 AMAQI
3rd Jul 2026441 AMAQI
3rd Jul 2026442 AMAQI
3rd Jul 2026443 AMAQI
3rd Jul 2026444 AMAQI
3rd Jul 2026405 AMAQI

29°C24/34°C

3rd Jul 2026386 AMAQI
3rd Jul 2026387 AMAQI
3rd Jul 2026368 AMAQI
3rd Jul 2026339 AMAQI
3rd Jul 20263010 AMAQI
3rd Jul 20263311 AMAQI
3rd Jul 20263012 PMAQI
3rd Jul 2026341 PMAQI
3rd Jul 2026362 PMAQI
3rd Jul 2026363 PMAQI
3rd Jul 2026364 PMAQI
3rd Jul 2026455 PMAQI
3rd Jul 2026476 PMAQI
3rd Jul 2026467 PMAQI
3rd Jul 2026368 PMAQI
3rd Jul 2026289 PMAQI
3rd Jul 20264810 PMAQI
3rd Jul 20263811 PMAQI
4th Jul 20262812 AMAQI
4th Jul 2026261 AMAQI
4th Jul 2026282 AMAQI
4th Jul 2026303 AMAQI
4th Jul 2026284 AMAQI
4th Jul 2026285 AMAQI

29°C23/35°C

4th Jul 2026266 AMAQI
4th Jul 2026267 AMAQI
4th Jul 2026268 AMAQI
4th Jul 2026269 AMAQI
4th Jul 20262710 AMAQI
4th Jul 20262611 AMAQI
4th Jul 20262912 PMAQI
4th Jul 2026251 PMAQI
4th Jul 2026272 PMAQI
4th Jul 2026233 PMAQI
4th Jul 2026264 PMAQI
4th Jul 2026265 PMAQI
4th Jul 2026266 PMAQI
4th Jul 2026247 PMAQI
4th Jul 2026208 PMAQI
4th Jul 2026249 PMAQI
4th Jul 20262510 PMAQI
4th Jul 20262511 PMAQI
5th Jul 20262312 AMAQI
5th Jul 2026321 AMAQI
5th Jul 2026342 AMAQI
5th Jul 2026283 AMAQI
5th Jul 2026304 AMAQI
5th Jul 2026255 AMAQI

24°C21/28°C

5th Jul 2026286 AMAQI
5th Jul 2026317 AMAQI
5th Jul 2026318 AMAQI
5th Jul 2026299 AMAQI
5th Jul 20262810 AMAQI
5th Jul 20262711 AMAQI
5th Jul 20263012 PMAQI
5th Jul 2026291 PMAQI
5th Jul 2026282 PMAQI
5th Jul 2026243 PMAQI
5th Jul 2026264 PMAQI
5th Jul 2026305 PMAQI
5th Jul 2026276 PMAQI
5th Jul 2026317 PMAQI
5th Jul 2026368 PMAQI
5th Jul 2026549 PMAQI
5th Jul 20263810 PMAQI
5th Jul 20262211 PMAQI
6th Jul 20262012 AMAQI
6th Jul 2026241 AMAQI
6th Jul 2026422 AMAQI
6th Jul 2026433 AMAQI
6th Jul 2026224 AMAQI
6th Jul 2026205 AMAQI

23°C20/27°C

6th Jul 2026266 AMAQI
6th Jul 2026297 AMAQI
6th Jul 2026288 AMAQI
6th Jul 2026289 AMAQI
6th Jul 20262810 AMAQI
6th Jul 20263011 AMAQI
6th Jul 20263112 PMAQI
6th Jul 2026311 PMAQI
6th Jul 2026302 PMAQI
6th Jul 2026303 PMAQI
6th Jul 2026314 PMAQI
6th Jul 2026335 PMAQI
6th Jul 2026316 PMAQI
6th Jul 2026327 PMAQI
6th Jul 2026268 PMAQI
6th Jul 2026279 PMAQI
6th Jul 20262510 PMAQI
6th Jul 20262311 PMAQI
7th Jul 20262212 AMAQI
7th Jul 2026261 AMAQI
7th Jul 2026322 AMAQI
7th Jul 2026403 AMAQI
7th Jul 2026544 AMAQI
7th Jul 2026505 AMAQI

23°C18/27°C

7th Jul 2026326 AMAQI
7th Jul 2026307 AMAQI
7th Jul 2026278 AMAQI
7th Jul 2026299 AMAQI
7th Jul 20262810 AMAQI
7th Jul 20263211 AMAQI
7th Jul 20263412 PMAQI
7th Jul 2026321 PMAQI
7th Jul 2026302 PMAQI
7th Jul 2026283 PMAQI
7th Jul 2026304 PMAQI
7th Jul 2026305 PMAQI
7th Jul 2026316 PMAQI
7th Jul 2026327 PMAQI
7th Jul 2026288 PMAQI
7th Jul 2026289 PMAQI
7th Jul 20262510 PMAQI
7th Jul 20262711 PMAQI
8th Jul 20262512 AMAQI
8th Jul 2026281 AMAQI
8th Jul 2026302 AMAQI
8th Jul 2026283 AMAQI
8th Jul 2026264 AMAQI
8th Jul 2026245 AMAQI

23°C18/28°C

8th Jul 2026206 AMAQI
8th Jul 2026207 AMAQI
8th Jul 2026258 AMAQI
8th Jul 2026249 AMAQI
8th Jul 20262810 AMAQI
8th Jul 20263211 AMAQI
8th Jul 20263212 PMAQI
8th Jul 2026301 PMAQI
8th Jul 2026332 PMAQI
8th Jul 2026283 PMAQI
8th Jul 2026324 PMAQI
8th Jul 2026305 PMAQI
8th Jul 2026306 PMAQI
8th Jul 2026307 PMAQI
8th Jul 2026258 PMAQI
8th Jul 2026269 PMAQI
8th Jul 20262410 PMAQI
8th Jul 20263311 PMAQI
9th Jul 20263012 AMAQI
9th Jul 2026261 AMAQI
9th Jul 2026402 AMAQI
9th Jul 2026293 AMAQI
9th Jul 2026284 AMAQI
9th Jul 2026285 AMAQI

23°C17/29°C

9th Jul 2026276 AMAQI
9th Jul 2026277 AMAQI
9th Jul 2026258 AMAQI
9th Jul 2026279 AMAQI
9th Jul 20263010 AMAQI
9th Jul 20262811 AMAQI
9th Jul 20263012 PMAQI
9th Jul 2026321 PMAQI
9th Jul 2026302 PMAQI
9th Jul 2026283 PMAQI
9th Jul 2026324 PMAQI
9th Jul 2026305 PMAQI
9th Jul 2026306 PMAQI
9th Jul 2026317 PMAQI
9th Jul 2026298 PMAQI
9th Jul 2026309 PMAQI
9th Jul 20262910 PMAQI
9th Jul 20263011 PMAQI
10th Jul 20262812 AMAQI
10th Jul 2026261 AMAQI
10th Jul 2026242 AMAQI
10th Jul 2026303 AMAQI
10th Jul 2026344 AMAQI
10th Jul 2026325 AMAQI

25°C21/31°C

10th Jul 2026316 AMAQI
10th Jul 2026337 AMAQI
10th Jul 2026318 AMAQI
10th Jul 2026349 AMAQI
10th Jul 20263410 AMAQI
10th Jul 20263411 AMAQI
10th Jul 20263512 PMAQI
10th Jul 2026361 PMAQI
10th Jul 2026342 PMAQI
10th Jul 2026303 PMAQI
10th Jul 2026354 PMAQI
10th Jul 2026325 PMAQI
10th Jul 2026336 PMAQI
10th Jul 2026347 PMAQI
10th Jul 2026348 PMAQI
10th Jul 2026369 PMAQI
10th Jul 20262210 PMAQI
10th Jul 20263011 PMAQI
11th Jul 20262512 AMAQI
11th Jul 2026261 AMAQI
11th Jul 2026252 AMAQI
11th Jul 2026283 AMAQI
11th Jul 2026324 AMAQI
11th Jul 2026305 AMAQI

23°C20/28°C

11th Jul 2026316 AMAQI
11th Jul 2026267 AMAQI
11th Jul 2026328 AMAQI
11th Jul 2026349 AMAQI
11th Jul 20263310 AMAQI
11th Jul 20263211 AMAQI
11th Jul 20263012 PMAQI
11th Jul 2026311 PMAQI
11th Jul 2026342 PMAQI
11th Jul 2026283 PMAQI
11th Jul 2026384 PMAQI
11th Jul 2026385 PMAQI
11th Jul 2026516 PMAQI
11th Jul 2026517 PMAQI
11th Jul 2026548 PMAQI
11th Jul 2026319 PMAQI
11th Jul 20265510 PMAQI
11th Jul 20265511 PMAQI
12th Jul 20265412 AMAQI
12th Jul 2026531 AMAQI
12th Jul 2026502 AMAQI
12th Jul 2026503 AMAQI
12th Jul 2026514 AMAQI
12th Jul 2026515 AMAQI

24°C17/29°C

12th Jul 2026526 AMAQI
12th Jul 2026537 AMAQI
12th Jul 2026528 AMAQI
12th Jul 2026539 AMAQI
12th Jul 20265110 AMAQI
12th Jul 20265111 AMAQI
12th Jul 20263212 PMAQI
12th Jul 2026361 PMAQI
12th Jul 2026332 PMAQI
12th Jul 2026343 PMAQI
12th Jul 2026424 PMAQI
12th Jul 2026485 PMAQI
12th Jul 2026306 PMAQI
12th Jul 2026307 PMAQI
12th Jul 2026328 PMAQI
12th Jul 2026339 PMAQI
12th Jul 20264010 PMAQI
12th Jul 20265511 PMAQI
13th Jul 20265112 AMAQI
13th Jul 2026481 AMAQI
13th Jul 2026462 AMAQI
13th Jul 2026483 AMAQI
13th Jul 2026424 AMAQI
13th Jul 2026515 AMAQI

23°C16/29°C

13th Jul 2026416 AMAQI
13th Jul 2026517 AMAQI
13th Jul 2026518 AMAQI
13th Jul 2026469 AMAQI
13th Jul 20264610 AMAQI
13th Jul 20264811 AMAQI
13th Jul 20264912 PMAQI
13th Jul 2026481 PMAQI
13th Jul 2026492 PMAQI
13th Jul 2026483 PMAQI
13th Jul 2026424 PMAQI
13th Jul 2026405 PMAQI
13th Jul 2026476 PMAQI
13th Jul 2026517 PMAQI
13th Jul 2026408 PMAQI
13th Jul 2026369 PMAQI
13th Jul 20263110 PMAQI
13th Jul 20262611 PMAQI
14th Jul 20262212 AMAQI
14th Jul 2026201 AMAQI
14th Jul 2026242 AMAQI
14th Jul 2026233 AMAQI
14th Jul 2026344 AMAQI
14th Jul 2026325 AMAQI

23°C15/31°C

14th Jul 2026326 AMAQI
14th Jul 2026347 AMAQI
14th Jul 2026348 AMAQI
14th Jul 2026349 AMAQI
14th Jul 20263610 AMAQI
14th Jul 20263511 AMAQI
14th Jul 20263812 PMAQI
14th Jul 2026341 PMAQI
14th Jul 2026342 PMAQI
14th Jul 2026283 PMAQI
14th Jul 2026324 PMAQI
14th Jul 2026275 PMAQI
14th Jul 2026326 PMAQI
14th Jul 2026347 PMAQI
14th Jul 2026328 PMAQI
14th Jul 2026329 PMAQI
14th Jul 20262610 PMAQI
14th Jul 20262411 PMAQI
15th Jul 20262212 AMAQI
15th Jul 2026221 AMAQI
15th Jul 2026202 AMAQI
15th Jul 2026233 AMAQI
15th Jul 2026244 AMAQI
15th Jul 2026245 AMAQI

27°C20/34°C

15th Jul 2026246 AMAQI
15th Jul 2026277 AMAQI
15th Jul 2026248 AMAQI
15th Jul 20261069 AMAQI
15th Jul 20262610 AMAQI
15th Jul 20262611 AMAQI
15th Jul 20262912 PMAQI
15th Jul 2026281 PMAQI
15th Jul 2026302 PMAQI
15th Jul 20261043 PMAQI
15th Jul 20261764 PMAQI
15th Jul 20261065 PMAQI
15th Jul 2026446 PMAQI
15th Jul 2026727 PMAQI
15th Jul 2026908 PMAQI
15th Jul 20261339 PMAQI
15th Jul 20268010 PMAQI
15th Jul 20268711 PMAQI
16th Jul 20267412 AMAQI
16th Jul 2026741 AMAQI
16th Jul 2026762 AMAQI
16th Jul 2026763 AMAQI
16th Jul 2026744 AMAQI
16th Jul 2026725 AMAQI

28°C23/35°C

16th Jul 2026746 AMAQI
16th Jul 2026877 AMAQI
16th Jul 2026868 AMAQI
16th Jul 2026889 AMAQI
16th Jul 20268510 AMAQI
16th Jul 20269211 AMAQI
16th Jul 20269012 PMAQI
16th Jul 2026801 PMAQI
16th Jul 2026692 PMAQI
16th Jul 20261213 PMAQI
16th Jul 20261264 PMAQI
16th Jul 20261405 PMAQI
16th Jul 20261496 PMAQI
16th Jul 2026827 PMAQI
16th Jul 2026858 PMAQI
16th Jul 2026859 PMAQI
16th Jul 20267410 PMAQI
16th Jul 20268311 PMAQI
17th Jul 20267412 AMAQI
17th Jul 2026821 AMAQI
17th Jul 2026712 AMAQI
17th Jul 20262863 AMAQI
17th Jul 20262864 AMAQI
17th Jul 20263285 AMAQI

23°C19/29°C

17th Jul 20263616 AMAQI
17th Jul 20263457 AMAQI
17th Jul 20263238 AMAQI
17th Jul 20262479 AMAQI
17th Jul 202620510 AMAQI
17th Jul 202617611 AMAQI
17th Jul 202616512 PMAQI
17th Jul 20261861 PMAQI
17th Jul 20262062 PMAQI
17th Jul 20262043 PMAQI
17th Jul 20262044 PMAQI
17th Jul 20262315 PMAQI
17th Jul 20262056 PMAQI
17th Jul 20261727 PMAQI
17th Jul 20261768 PMAQI
17th Jul 20261829 PMAQI
17th Jul 202618810 PMAQI
17th Jul 202619211 PMAQI
18th Jul 202618212 AMAQI
18th Jul 20261751 AMAQI
18th Jul 20261762 AMAQI
18th Jul 20261863 AMAQI
18th Jul 20261774 AMAQI
18th Jul 20261635 AMAQI

21°C14/28°C

18th Jul 20261546 AMAQI
18th Jul 20261487 AMAQI
18th Jul 20261068 AMAQI
18th Jul 20261009 AMAQI
18th Jul 20268610 AMAQI
18th Jul 20267811 AMAQI
18th Jul 20267312 PMAQI
18th Jul 2026671 PMAQI
18th Jul 2026552 PMAQI
18th Jul 2026623 PMAQI
18th Jul 2026594 PMAQI
18th Jul 2026755 PMAQI
18th Jul 2026766 PMAQI
18th Jul 2026787 PMAQI
18th Jul 20261538 PMAQI
18th Jul 20261549 PMAQI
18th Jul 202614610 PMAQI
18th Jul 20268511 PMAQI
19th Jul 20268112 AMAQI
19th Jul 2026781 AMAQI
19th Jul 2026812 AMAQI
19th Jul 2026893 AMAQI
19th Jul 20261054 AMAQI
19th Jul 2026985 AMAQI

25°C19/32°C

19th Jul 2026886 AMAQI
19th Jul 2026927 AMAQI
19th Jul 2026908 AMAQI
19th Jul 2026789 AMAQI
19th Jul 20268310 AMAQI
19th Jul 20269911 AMAQI
19th Jul 20268012 PMAQI
19th Jul 2026561 PMAQI
19th Jul 2026732 PMAQI
19th Jul 2026873 PMAQI
19th Jul 2026864 PMAQI
19th Jul 2026805 PMAQI
19th Jul 2026656 PMAQI
19th Jul 2026887 PMAQI
19th Jul 2026988 PMAQI
19th Jul 2026999 PMAQI
19th Jul 202610210 PMAQI
19th Jul 20269011 PMAQI
20th Jul 20267812 AMAQI
20th Jul 2026871 AMAQI
20th Jul 2026832 AMAQI
20th Jul 2026733 AMAQI
20th Jul 2026764 AMAQI
20th Jul 2026705 AMAQI

20°C15/25°C

20th Jul 2026646 AMAQI
20th Jul 2026667 AMAQI
20th Jul 2026678 AMAQI
20th Jul 2026649 AMAQI
20th Jul 20265210 AMAQI
20th Jul 20265211 AMAQI
20th Jul 20265212 PMAQI
20th Jul 2026551 PMAQI
20th Jul 2026502 PMAQI
20th Jul 2026783 PMAQI
20th Jul 2026934 PMAQI
20th Jul 20261105 PMAQI
20th Jul 20261146 PMAQI
20th Jul 20261127 PMAQI
20th Jul 20261098 PMAQI
20th Jul 2026989 PMAQI
20th Jul 202610810 PMAQI
21st Jul 20269912 AMAQI
21st Jul 2026961 AMAQI
21st Jul 20261042 AMAQI
21st Jul 2026903 AMAQI
21st Jul 2026854 AMAQI
21st Jul 2026865 AMAQI

19°C11/26°C

21st Jul 2026796 AMAQI
21st Jul 2026587 AMAQI
21st Jul 2026908 AMAQI
21st Jul 2026949 AMAQI
21st Jul 202610010 AMAQI
21st Jul 202610611 AMAQI
21st Jul 20266912 PMAQI
21st Jul 2026591 PMAQI
21st Jul 2026512 PMAQI
21st Jul 2026553 PMAQI
21st Jul 2026554 PMAQI
21st Jul 2026195 PMAQI
21st Jul 2026226 PMAQI
21st Jul 2026257 PMAQI
21st Jul 2026318 PMAQI
21st Jul 2026389 PMAQI
21st Jul 20262910 PMAQI
21st Jul 20262911 PMAQI
22nd Jul 20262112 AMAQI
22nd Jul 2026211 AMAQI
22nd Jul 2026162 AMAQI
22nd Jul 2026143 AMAQI
22nd Jul 2026234 AMAQI
22nd Jul 2026245 AMAQI

23°C19/28°C

22nd Jul 2026246 AMAQI
22nd Jul 2026267 AMAQI
22nd Jul 2026298 AMAQI
22nd Jul 2026299 AMAQI
22nd Jul 20263010 AMAQI
22nd Jul 20262911 AMAQI
22nd Jul 20262212 PMAQI
22nd Jul 2026221 PMAQI
22nd Jul 2026202 PMAQI
22nd Jul 2026213 PMAQI
22nd Jul 2026204 PMAQI
22nd Jul 2026225 PMAQI
22nd Jul 2026206 PMAQI
22nd Jul 2026277 PMAQI
22nd Jul 2026258 PMAQI
22nd Jul 2026269 PMAQI
22nd Jul 20262010 PMAQI
22nd Jul 20261911 PMAQI
23rd Jul 20261812 AMAQI
23rd Jul 2026201 AMAQI
23rd Jul 2026192 AMAQI
23rd Jul 2026203 AMAQI
23rd Jul 2026204 AMAQI
23rd Jul 2026205 AMAQI

18°C14/23°C

23rd Jul 2026206 AMAQI
23rd Jul 2026187 AMAQI
23rd Jul 2026248 AMAQI
23rd Jul 2026229 AMAQI
23rd Jul 20262410 AMAQI
23rd Jul 20264211 AMAQI
23rd Jul 20264412 PMAQI
23rd Jul 2026331 PMAQI
23rd Jul 2026252 PMAQI
23rd Jul 2026273 PMAQI
23rd Jul 2026294 PMAQI
23rd Jul 2026255 PMAQI
23rd Jul 2026296 PMAQI
23rd Jul 2026237 PMAQI
23rd Jul 2026248 PMAQI
23rd Jul 2026259 PMAQI
23rd Jul 20262910 PMAQI
23rd Jul 20263111 PMAQI
24th Jul 20265312 AMAQI
24th Jul 2026381 AMAQI
24th Jul 2026342 AMAQI
24th Jul 2026323 AMAQI
24th Jul 2026274 AMAQI
24th Jul 2026295 AMAQI

18°C10/24°C

24th Jul 2026256 AMAQI
24th Jul 2026347 AMAQI
24th Jul 2026348 AMAQI
24th Jul 2026259 AMAQI
24th Jul 20262910 AMAQI
24th Jul 20262911 AMAQI
24th Jul 20264212 PMAQI
24th Jul 2026271 PMAQI
24th Jul 2026252 PMAQI
24th Jul 2026363 PMAQI
24th Jul 2026384 PMAQI
24th Jul 2026335 PMAQI
24th Jul 2026276 PMAQI
24th Jul 2026257 PMAQI
24th Jul 2026258 PMAQI
24th Jul 2026259 PMAQI
24th Jul 20262510 PMAQI
24th Jul 20262511 PMAQI
25th Jul 20262712 AMAQI
25th Jul 2026271 AMAQI
25th Jul 2026342 AMAQI
25th Jul 2026363 AMAQI
25th Jul 2026294 AMAQI
25th Jul 2026275 AMAQI

19°C13/26°C

25th Jul 2026256 AMAQI
25th Jul 2026277 AMAQI
25th Jul 2026258 AMAQI
25th Jul 2026259 AMAQI
25th Jul 20262110 AMAQI
25th Jul 20262511 AMAQI
25th Jul 20262512 PMAQI
25th Jul 2026211 PMAQI
25th Jul 2026232 PMAQI
25th Jul 2026233 PMAQI
25th Jul 2026214 PMAQI
25th Jul 2026215 PMAQI
25th Jul 2026216 PMAQI
25th Jul 2026217 PMAQI
25th Jul 2026218 PMAQI
25th Jul 2026219 PMAQI
25th Jul 20262110 PMAQI
25th Jul 20262111 PMAQI
26th Jul 20262512 AMAQI
26th Jul 2026231 AMAQI
26th Jul 2026312 AMAQI
26th Jul 2026363 AMAQI
26th Jul 2026334 AMAQI
26th Jul 2026385 AMAQI

21°C15/27°C

26th Jul 2026446 AMAQI
26th Jul 2026407 AMAQI
26th Jul 2026388 AMAQI
26th Jul 2026339 AMAQI
26th Jul 20263110 AMAQI
26th Jul 20262511 AMAQI
26th Jul 20262512 PMAQI
26th Jul 2026251 PMAQI
26th Jul 2026252 PMAQI
26th Jul 2026273 PMAQI
26th Jul 2026254 PMAQI
26th Jul 2026275 PMAQI
26th Jul 2026336 PMAQI
26th Jul 2026367 PMAQI
26th Jul 2026388 PMAQI
26th Jul 2026409 PMAQI
26th Jul 20264210 PMAQI
26th Jul 20264211 PMAQI
27th Jul 20264212 AMAQI
27th Jul 2026461 AMAQI
27th Jul 2026462 AMAQI
27th Jul 2026463 AMAQI
27th Jul 2026484 AMAQI
27th Jul 2026485 AMAQI

22°C16/27°C

27th Jul 2026486 AMAQI
27th Jul 2026487 AMAQI
27th Jul 2026508 AMAQI
27th Jul 2026509 AMAQI
27th Jul 20265010 AMAQI
27th Jul 20264611 AMAQI
27th Jul 20264412 PMAQI
27th Jul 2026481 PMAQI
27th Jul 2026542 PMAQI
27th Jul 2026583 PMAQI
27th Jul 2026594 PMAQI
27th Jul 2026535 PMAQI
27th Jul 2026556 PMAQI
27th Jul 2026537 PMAQI
27th Jul 2026558 PMAQI
27th Jul 2026529 PMAQI
27th Jul 20265210 PMAQI
27th Jul 20265411 PMAQI
28th Jul 20265412 AMAQI
28th Jul 2026551 AMAQI
28th Jul 2026572 AMAQI
28th Jul 2026623 AMAQI
28th Jul 2026644 AMAQI
28th Jul 2026665 AMAQI

23°C18/29°C

28th Jul 2026686 AMAQI
28th Jul 2026697 AMAQI
28th Jul 2026708 AMAQI
28th Jul 2026689 AMAQI
28th Jul 20266510 AMAQI
28th Jul 20266211 AMAQI
28th Jul 20266012 PMAQI
28th Jul 2026601 PMAQI
28th Jul 2026632 PMAQI
28th Jul 2026573 PMAQI
28th Jul 2026514 PMAQI
28th Jul 2026475 PMAQI
28th Jul 2026406 PMAQI
28th Jul 2026527 PMAQI
28th Jul 2026538 PMAQI
28th Jul 2026459 PMAQI
28th Jul 20264010 PMAQI
28th Jul 20263611 PMAQI
29th Jul 20264212 AMAQI
29th Jul 2026421 AMAQI
29th Jul 2026442 AMAQI
29th Jul 2026343 AMAQI
29th Jul 2026274 AMAQI
29th Jul 2026255 AMAQI

22°C18/26°C

29th Jul 2026236 AMAQI
29th Jul 2026257 AMAQI
29th Jul 2026208 AMAQI
29th Jul 2026199 AMAQI
29th Jul 20262210 AMAQI
29th Jul 20261811 AMAQI
29th Jul 20262112 PMAQI
29th Jul 2026221 PMAQI
29th Jul 2026202 PMAQI
29th Jul 2026183 PMAQI
29th Jul 2026224 PMAQI
29th Jul 2026205 PMAQI
29th Jul 2026236 PMAQI
29th Jul 2026227 PMAQI
29th Jul 2026218 PMAQI
29th Jul 2026189 PMAQI
29th Jul 20261810 PMAQI
29th Jul 20262011 PMAQI
30th Jul 20261712 AMAQI
30th Jul 2026221 AMAQI
30th Jul 2026192 AMAQI
30th Jul 2026203 AMAQI
30th Jul 2026294 AMAQI
30th Jul 2026225 AMAQI

22°C16/27°C

30th Jul 2026226 AMAQI
6 AM
30th Jul 2026207 AMAQI
30th Jul 2026258 AMAQI
30th Jul 2026209 AMAQI
30th Jul 20263810 AMAQI
30th Jul 20263311 AMAQI
30th Jul 20263312 PMAQI
30th Jul 2026401 PMAQI
1 PM
30th Jul 2026422 PMAQI
30th Jul 2026483 PMAQI
30th Jul 2026464 PMAQI
30th Jul 2026475 PMAQI
30th Jul 2026426 PMAQI
30th Jul 2026347 PMAQI
30th Jul 2026588 PMAQI
30th Jul 2026569 PMAQI
9 PM
30th Jul 20262910 PMAQI
30th Jul 20262611 PMAQI
1 AM
5 AM

22°C14/29°C

Day time
Avg. Highest Time
6 AM - 9 AM

54AQI

4 hours / Day
120 hours / Month
Avg. Lowest Time
12 PM - 2 PM

46AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 6 AM to 9 AM (Avg. 54), while the lowest AQI was between 12 PM to 2 PM (Avg. 46).
Night time
Avg. Highest Time
3 AM - 5 AM

55AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
12 AM - 1 AM

46AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 AM to 5 AM (Avg. 55), while the lowest AQI was between 12 AM to 1 AM (Avg. 46).

2026 Days Vs Air Quality

St Thomas, Ontario, Canada

2026

80%

166

18%

37

1%

3

0.4%

1

Total number of days with different AQI categories in last 211 days in 2026 (154 days remaining)

Good
166 Days
Moderate
37 Days
Poor
3 Days
Unhealthy
0 Days
Severe
1 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 80%

Health Risk Level:

Low

In 2026, 80% of 211 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

St Thomas, Ontario, 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
9AQI (US)
2nd January 2026
11AQI (US)
3rd January 2026
19AQI (US)
4th January 2026
20AQI (US)
5th January 2026
59AQI (US)
6th January 2026
83AQI (US)
7th January 2026
50AQI (US)
8th January 2026
49AQI (US)
9th January 2026
20AQI (US)
10th January 2026
16AQI (US)
11th January 2026
15AQI (US)
12th January 2026
20AQI (US)
13th January 2026
30AQI (US)
14th January 2026
24AQI (US)
15th January 2026
12AQI (US)
16th January 2026
17AQI (US)
17th January 2026
33AQI (US)
18th January 2026
21AQI (US)
19th January 2026
29AQI (US)
20th January 2026
23AQI (US)
21st January 2026
23AQI (US)
22nd January 2026
52AQI (US)
23rd January 2026
60AQI (US)
24th January 2026
48AQI (US)
25th January 2026
50AQI (US)
26th January 2026
48AQI (US)
27th January 2026
43AQI (US)
28th January 2026
42AQI (US)
29th January 2026
49AQI (US)
30th January 2026
59AQI (US)
31st January 2026
42AQI (US)
1st February 2026
46AQI (US)
2nd February 2026
74AQI (US)
3rd February 2026
73AQI (US)
4th February 2026
44AQI (US)
5th February 2026
54AQI (US)
6th February 2026
76AQI (US)
7th February 2026
39AQI (US)
8th February 2026
42AQI (US)
9th February 2026
46AQI (US)
10th February 2026
47AQI (US)
11th February 2026
38AQI (US)
12th February 2026
38AQI (US)
13th February 2026
51AQI (US)
14th February 2026
83AQI (US)
15th February 2026
79AQI (US)
16th February 2026
102AQI (US)
17th February 2026
114AQI (US)
18th February 2026
62AQI (US)
19th February 2026
46AQI (US)
20th February 2026
50AQI (US)
21st February 2026
41AQI (US)
22nd February 2026
33AQI (US)
23rd February 2026
39AQI (US)
24th February 2026
43AQI (US)
25th February 2026
58AQI (US)
26th February 2026
31AQI (US)
27th February 2026
71AQI (US)
28th February 2026
38AQI (US)
1st March 2026
37AQI (US)
2nd March 2026
50AQI (US)
3rd March 2026
58AQI (US)
4th March 2026
95AQI (US)
5th March 2026
75AQI (US)
6th March 2026
58AQI (US)
7th March 2026
80AQI (US)
8th March 2026
35AQI (US)
9th March 2026
34AQI (US)
10th March 2026
59AQI (US)
11th March 2026
44AQI (US)
12th March 2026
38AQI (US)
13th March 2026
43AQI (US)
14th March 2026
35AQI (US)
15th March 2026
32AQI (US)
16th March 2026
37AQI (US)
17th March 2026
34AQI (US)
18th March 2026
36AQI (US)
19th March 2026
64AQI (US)
20th March 2026
81AQI (US)
21st March 2026
40AQI (US)
22nd March 2026
58AQI (US)
23rd March 2026
39AQI (US)
24th March 2026
34AQI (US)
25th March 2026
45AQI (US)
26th March 2026
61AQI (US)
27th March 2026
29AQI (US)
28th March 2026
31AQI (US)
29th March 2026
35AQI (US)
30th March 2026
42AQI (US)
31st March 2026
66AQI (US)
1st April 2026
30AQI (US)
2nd April 2026
30AQI (US)
3rd April 2026
39AQI (US)
4th April 2026
28AQI (US)
5th April 2026
31AQI (US)
6th April 2026
27AQI (US)
7th April 2026
27AQI (US)
8th April 2026
37AQI (US)
9th April 2026
49AQI (US)
10th April 2026
33AQI (US)
11th April 2026
30AQI (US)
12th April 2026
47AQI (US)
13th April 2026
46AQI (US)
14th April 2026
48AQI (US)
15th April 2026
41AQI (US)
16th April 2026
50AQI (US)
17th April 2026
18th April 2026
40AQI (US)
19th April 2026
33AQI (US)
20th April 2026
29AQI (US)
21st April 2026
33AQI (US)
22nd April 2026
23rd April 2026
37AQI (US)
24th April 2026
27AQI (US)
25th April 2026
28AQI (US)
26th April 2026
32AQI (US)
27th April 2026
27AQI (US)
28th April 2026
30AQI (US)
29th April 2026
28AQI (US)
30th April 2026
26AQI (US)
1st May 2026
26AQI (US)
2nd May 2026
23AQI (US)
3rd May 2026
30AQI (US)
4th May 2026
32AQI (US)
5th May 2026
40AQI (US)
6th May 2026
39AQI (US)
7th May 2026
27AQI (US)
8th May 2026
34AQI (US)
9th May 2026
10th May 2026
30AQI (US)
11th May 2026
27AQI (US)
12th May 2026
28AQI (US)
13th May 2026
42AQI (US)
14th May 2026
22AQI (US)
15th May 2026
40AQI (US)
16th May 2026
56AQI (US)
17th May 2026
65AQI (US)
18th May 2026
63AQI (US)
19th May 2026
44AQI (US)
20th May 2026
49AQI (US)
21st May 2026
44AQI (US)
22nd May 2026
44AQI (US)
23rd May 2026
51AQI (US)
24th May 2026
40AQI (US)
25th May 2026
44AQI (US)
26th May 2026
32AQI (US)
27th May 2026
29AQI (US)
28th May 2026
24AQI (US)
29th May 2026
24AQI (US)
30th May 2026
23AQI (US)
31st May 2026
28AQI (US)
1st June 2026
32AQI (US)
2nd June 2026
28AQI (US)
3rd June 2026
38AQI (US)
4th June 2026
28AQI (US)
5th June 2026
27AQI (US)
6th June 2026
25AQI (US)
7th June 2026
24AQI (US)
8th June 2026
26AQI (US)
9th June 2026
26AQI (US)
10th June 2026
27AQI (US)
11th June 2026
27AQI (US)
12th June 2026
26AQI (US)
13th June 2026
24AQI (US)
14th June 2026
23AQI (US)
15th June 2026
25AQI (US)
16th June 2026
27AQI (US)
17th June 2026
27AQI (US)
18th June 2026
27AQI (US)
19th June 2026
24AQI (US)
20th June 2026
24AQI (US)
21st June 2026
20AQI (US)
22nd June 2026
23AQI (US)
23rd June 2026
24AQI (US)
24th June 2026
24AQI (US)
25th June 2026
38AQI (US)
26th June 2026
27AQI (US)
27th June 2026
33AQI (US)
28th June 2026
28AQI (US)
29th June 2026
26AQI (US)
30th June 2026
30AQI (US)
1st July 2026
48AQI (US)
2nd July 2026
60AQI (US)
3rd July 2026
39AQI (US)
4th July 2026
26AQI (US)
5th July 2026
30AQI (US)
6th July 2026
29AQI (US)
7th July 2026
32AQI (US)
8th July 2026
28AQI (US)
9th July 2026
29AQI (US)
10th July 2026
32AQI (US)
11th July 2026
35AQI (US)
12th July 2026
44AQI (US)
13th July 2026
45AQI (US)
14th July 2026
31AQI (US)
15th July 2026
56AQI (US)
16th July 2026
89AQI (US)
17th July 2026
212AQI (US)
18th July 2026
117AQI (US)
19th July 2026
86AQI (US)
20th July 2026
79AQI (US)
21st July 2026
65AQI (US)
22nd July 2026
23AQI (US)
23rd July 2026
25AQI (US)
24th July 2026
31AQI (US)
25th July 2026
24AQI (US)
26th July 2026
33AQI (US)
27th July 2026
50AQI (US)
28th July 2026
57AQI (US)
29th July 2026
24AQI (US)
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

35AQI (US)

56AQI (US)

49AQI (US)

34AQI (US)

37AQI (US)

27AQI (US)

51AQI (US)

No. of days

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

202641AQI (US)

26
5
16
10
2
20
11
28
26
4
30
20
7
1
1
166
37
3
1

Highest AQI (US) recorded in

February

56AQI (US)

Lowest AQI (US) recorded in

June

27AQI (US)

202534AQI (US)

30
1
24
4
29
2
30
31
18
12
25
6
17
12
2
29
1
31
26
4
24
7
314
49
2

Highest AQI (US) recorded in

August

49AQI (US)

Lowest AQI (US) recorded in

May

22AQI (US)

202433AQI (US)

28
3
25
4
30
1
28
28
3
26
2
31
26
5
29
1
29
2
29
1
30
1
339
23

Highest AQI (US) recorded in

January

37AQI (US)

Lowest AQI (US) recorded in

November

26AQI (US)

202341AQI (US)

24
7
25
3
29
2
23
7
27
4
9
16
4
1
23
7
1
20
11
28
2
29
2
26
3
24
7
287
71
5
1

Highest AQI (US) recorded in

June

73AQI (US)

Lowest AQI (US) recorded in

October

30AQI (US)

202233AQI (US)

28
3
21
27
4
24
31
24
6
19
4
1
24
3
31
26
4
28
3
284
27

Highest AQI (US) recorded in

June

37AQI (US)

Lowest AQI (US) recorded in

August

21AQI (US)

202136AQI (US)

26
3
25
3
29
2
28
2
30
1
28
2
21
8
1
1
26
2
1
2
25
5
30
1
30
30
1
328
30
2
3

Highest AQI (US) recorded in

July

48AQI (US)

Lowest AQI (US) recorded in

November

27AQI (US)

202033AQI (US)

12
21
18
28
2
28
3
29
2
27
3
30
1
26
4
26
5
245
20

Highest AQI (US) recorded in

June

37AQI (US)

Lowest AQI (US) recorded in

October

28AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2026(Avg.)
41AQI (US)
Least Polluted Year Recorded
2020(Avg.)
33AQI (US)

St Thomas's annual 2026 AQI (US) (41) shows an average percentage change of 17.8% (worsened AQI (US)) compared to previous years: 2020 (33), 2021 (36), 2022 (33), 2023 (41), 2024 (33), 2025 (34).