St Catharines, 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 Catharines, Ontario, Canada
2022
2023
2024
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
11th Jul 2022
165AQILowest AQI recorded on
18th Jul 2025
20AQISame 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 Catharines, Ontario, Canada
AQI
Day
Night
.
5 AM29th Jul 2026
8 PM
4 AM30th Jul 2026
Day time
Avg. Highest Time
7PM29th Jul
36AQI
Avg. Lowest Time
8PM29th Jul
21AQI
Night time
Avg. Highest Time
3AM30th Jul
40AQI
Avg. Lowest Time
10PM29th Jul
21AQI
In the last 24 hours,
St Catharines's AQI reached its highest point of 40 at 3 AM during the Night, while the lowest point, 21, was recorded at 10 PM during the Night between 29th Jul and 30th Jul 2026.
Day & Night AQI Trend : Jul 2026
St Catharines, 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 2026245 AMAQI
1st Jul 2026266 AMAQI
1st Jul 2026267 AMAQI
1st Jul 2026268 AMAQI
1st Jul 2026289 AMAQI
1st Jul 20265610 AMAQI
1st Jul 20262911 AMAQI
1st Jul 20263012 PMAQI
1st Jul 2026581 PMAQI
1st Jul 2026542 PMAQI
1st Jul 2026523 PMAQI
1st Jul 2026544 PMAQI
1st Jul 2026265 PMAQI
1st Jul 2026286 PMAQI
1st Jul 2026527 PMAQI
1st Jul 2026528 PMAQI
1st Jul 2026249 PMAQI
1st Jul 20262310 PMAQI
1st Jul 20262011 PMAQI
2nd Jul 20262212 AMAQI
2nd Jul 2026321 AMAQI
2nd Jul 2026362 AMAQI
2nd Jul 2026443 AMAQI
2nd Jul 2026264 AMAQI
29°C24/37°C
2nd Jul 2026265 AMAQI
2nd Jul 2026516 AMAQI
2nd Jul 2026507 AMAQI
2nd Jul 2026708 AMAQI
2nd Jul 2026679 AMAQI
2nd Jul 20266510 AMAQI
2nd Jul 20266011 AMAQI
2nd Jul 20265512 PMAQI
2nd Jul 2026541 PMAQI
2nd Jul 2026572 PMAQI
2nd Jul 2026543 PMAQI
2nd Jul 2026274 PMAQI
2nd Jul 2026365 PMAQI
2nd Jul 2026376 PMAQI
2nd Jul 2026367 PMAQI
2nd Jul 2026258 PMAQI
2nd Jul 2026279 PMAQI
2nd Jul 20262410 PMAQI
2nd Jul 20262711 PMAQI
3rd Jul 20262612 AMAQI
3rd Jul 2026271 AMAQI
3rd Jul 2026302 AMAQI
3rd Jul 2026313 AMAQI
3rd Jul 2026314 AMAQI
29°C23/36°C
3rd Jul 2026295 AMAQI
3rd Jul 2026326 AMAQI
3rd Jul 2026337 AMAQI
3rd Jul 2026348 AMAQI
3rd Jul 2026369 AMAQI
3rd Jul 20263110 AMAQI
3rd Jul 20263111 AMAQI
3rd Jul 20263112 PMAQI
3rd Jul 2026301 PMAQI
3rd Jul 2026282 PMAQI
3rd Jul 2026313 PMAQI
3rd Jul 2026314 PMAQI
3rd Jul 2026315 PMAQI
3rd Jul 2026286 PMAQI
3rd Jul 2026287 PMAQI
3rd Jul 2026268 PMAQI
3rd Jul 2026279 PMAQI
3rd Jul 20262810 PMAQI
3rd Jul 20262411 PMAQI
4th Jul 20262712 AMAQI
4th Jul 2026281 AMAQI
4th Jul 2026302 AMAQI
4th Jul 2026303 AMAQI
4th Jul 2026294 AMAQI
28°C23/35°C
4th Jul 2026295 AMAQI
4th Jul 2026266 AMAQI
4th Jul 2026267 AMAQI
4th Jul 2026288 AMAQI
4th Jul 2026289 AMAQI
4th Jul 20262610 AMAQI
4th Jul 20262611 AMAQI
4th Jul 20262912 PMAQI
4th Jul 2026281 PMAQI
4th Jul 2026362 PMAQI
4th Jul 2026323 PMAQI
4th Jul 2026344 PMAQI
4th Jul 2026255 PMAQI
4th Jul 2026286 PMAQI
4th Jul 2026247 PMAQI
4th Jul 2026208 PMAQI
4th Jul 2026209 PMAQI
4th Jul 20262210 PMAQI
4th Jul 20263611 PMAQI
5th Jul 20262012 AMAQI
5th Jul 2026261 AMAQI
5th Jul 2026262 AMAQI
5th Jul 2026263 AMAQI
5th Jul 2026544 AMAQI
26°C23/30°C
5th Jul 2026475 AMAQI
5th Jul 2026266 AMAQI
5th Jul 2026247 AMAQI
5th Jul 2026348 AMAQI
5th Jul 2026249 AMAQI
5th Jul 20262810 AMAQI
5th Jul 20262911 AMAQI
5th Jul 20262812 PMAQI
5th Jul 2026271 PMAQI
5th Jul 2026392 PMAQI
5th Jul 2026233 PMAQI
5th Jul 2026284 PMAQI
5th Jul 2026265 PMAQI
5th Jul 2026246 PMAQI
5th Jul 2026267 PMAQI
5th Jul 2026228 PMAQI
5th Jul 2026369 PMAQI
5th Jul 20262410 PMAQI
5th Jul 20262011 PMAQI
6th Jul 20262012 AMAQI
6th Jul 2026281 AMAQI
6th Jul 2026442 AMAQI
6th Jul 2026283 AMAQI
6th Jul 2026224 AMAQI
22°C19/27°C
6th Jul 2026215 AMAQI
6th Jul 2026236 AMAQI
6th Jul 2026307 AMAQI
6th Jul 2026268 AMAQI
6th Jul 2026299 AMAQI
6th Jul 20263010 AMAQI
6th Jul 20263211 AMAQI
6th Jul 20263012 PMAQI
6th Jul 2026321 PMAQI
6th Jul 2026312 PMAQI
6th Jul 2026303 PMAQI
6th Jul 2026324 PMAQI
6th Jul 2026325 PMAQI
6th Jul 2026306 PMAQI
6th Jul 2026327 PMAQI
6th Jul 2026268 PMAQI
6th Jul 2026279 PMAQI
6th Jul 20262410 PMAQI
6th Jul 20262511 PMAQI
7th Jul 20262412 AMAQI
7th Jul 2026261 AMAQI
7th Jul 2026322 AMAQI
7th Jul 2026563 AMAQI
7th Jul 2026444 AMAQI
22°C17/28°C
7th Jul 2026325 AMAQI
7th Jul 2026306 AMAQI
7th Jul 2026297 AMAQI
7th Jul 2026388 AMAQI
7th Jul 2026279 AMAQI
7th Jul 20262610 AMAQI
7th Jul 20263511 AMAQI
7th Jul 20263312 PMAQI
7th Jul 2026341 PMAQI
7th Jul 2026312 PMAQI
7th Jul 2026303 PMAQI
7th Jul 2026304 PMAQI
7th Jul 2026325 PMAQI
7th Jul 2026326 PMAQI
7th Jul 2026347 PMAQI
7th Jul 2026288 PMAQI
7th Jul 2026469 PMAQI
7th Jul 20262610 PMAQI
7th Jul 20262811 PMAQI
8th Jul 20262612 AMAQI
8th Jul 2026281 AMAQI
8th Jul 2026292 AMAQI
8th Jul 2026283 AMAQI
8th Jul 2026264 AMAQI
23°C17/28°C
8th Jul 2026265 AMAQI
8th Jul 2026206 AMAQI
8th Jul 2026207 AMAQI
8th Jul 2026228 AMAQI
8th Jul 2026269 AMAQI
8th Jul 20263010 AMAQI
8th Jul 20263211 AMAQI
8th Jul 20263112 PMAQI
8th Jul 2026321 PMAQI
8th Jul 2026362 PMAQI
8th Jul 2026303 PMAQI
8th Jul 2026364 PMAQI
8th Jul 2026305 PMAQI
8th Jul 2026406 PMAQI
8th Jul 2026287 PMAQI
8th Jul 2026238 PMAQI
8th Jul 2026249 PMAQI
8th Jul 20262310 PMAQI
8th Jul 20262211 PMAQI
9th Jul 20263412 AMAQI
9th Jul 2026251 AMAQI
9th Jul 2026422 AMAQI
9th Jul 2026273 AMAQI
9th Jul 2026284 AMAQI
24°C17/32°C
9th Jul 2026275 AMAQI
9th Jul 2026256 AMAQI
9th Jul 2026267 AMAQI
9th Jul 2026288 AMAQI
9th Jul 2026279 AMAQI
9th Jul 20263210 AMAQI
9th Jul 20263011 AMAQI
9th Jul 20263012 PMAQI
9th Jul 2026301 PMAQI
9th Jul 2026302 PMAQI
9th Jul 2026283 PMAQI
9th Jul 2026304 PMAQI
9th Jul 2026295 PMAQI
9th Jul 2026336 PMAQI
9th Jul 2026387 PMAQI
9th Jul 2026318 PMAQI
9th Jul 2026309 PMAQI
9th Jul 20263010 PMAQI
9th Jul 20262911 PMAQI
10th Jul 20262812 AMAQI
10th Jul 2026241 AMAQI
10th Jul 2026242 AMAQI
10th Jul 2026283 AMAQI
10th Jul 2026344 AMAQI
25°C20/33°C
10th Jul 2026325 AMAQI
10th Jul 2026316 AMAQI
10th Jul 2026347 AMAQI
10th Jul 2026328 AMAQI
10th Jul 2026349 AMAQI
10th Jul 20263410 AMAQI
10th Jul 20264211 AMAQI
10th Jul 20264612 PMAQI
10th Jul 2026531 PMAQI
10th Jul 2026492 PMAQI
10th Jul 2026513 PMAQI
10th Jul 2026484 PMAQI
10th Jul 2026495 PMAQI
10th Jul 2026406 PMAQI
10th Jul 2026347 PMAQI
10th Jul 2026368 PMAQI
10th Jul 2026389 PMAQI
10th Jul 20263010 PMAQI
10th Jul 20262911 PMAQI
11th Jul 20262812 AMAQI
11th Jul 2026261 AMAQI
11th Jul 2026242 AMAQI
11th Jul 2026283 AMAQI
11th Jul 2026324 AMAQI
23°C19/28°C
11th Jul 2026325 AMAQI
11th Jul 2026326 AMAQI
11th Jul 2026287 AMAQI
11th Jul 2026348 AMAQI
11th Jul 2026549 AMAQI
11th Jul 20263410 AMAQI
11th Jul 20263411 AMAQI
11th Jul 20263412 PMAQI
11th Jul 2026331 PMAQI
11th Jul 2026322 PMAQI
11th Jul 2026303 PMAQI
11th Jul 2026324 PMAQI
11th Jul 2026325 PMAQI
11th Jul 2026316 PMAQI
11th Jul 2026327 PMAQI
11th Jul 2026328 PMAQI
11th Jul 2026329 PMAQI
11th Jul 20262810 PMAQI
11th Jul 20262911 PMAQI
12th Jul 20262412 AMAQI
12th Jul 2026261 AMAQI
12th Jul 2026482 AMAQI
12th Jul 2026693 AMAQI
12th Jul 2026684 AMAQI
23°C17/29°C
12th Jul 2026625 AMAQI
12th Jul 2026626 AMAQI
12th Jul 2026587 AMAQI
12th Jul 2026558 AMAQI
12th Jul 2026519 AMAQI
12th Jul 20263810 AMAQI
12th Jul 20263311 AMAQI
12th Jul 20263212 PMAQI
12th Jul 2026441 PMAQI
12th Jul 2026462 PMAQI
12th Jul 2026523 PMAQI
12th Jul 2026554 PMAQI
12th Jul 2026545 PMAQI
12th Jul 2026486 PMAQI
12th Jul 2026387 PMAQI
12th Jul 2026328 PMAQI
12th Jul 2026449 PMAQI
12th Jul 20265610 PMAQI
12th Jul 20262611 PMAQI
13th Jul 20263812 AMAQI
13th Jul 2026441 AMAQI
13th Jul 2026222 AMAQI
13th Jul 2026423 AMAQI
13th Jul 2026484 AMAQI
22°C16/29°C
13th Jul 2026445 AMAQI
13th Jul 2026346 AMAQI
13th Jul 2026467 AMAQI
13th Jul 2026518 AMAQI
13th Jul 2026579 AMAQI
13th Jul 20263610 AMAQI
13th Jul 20264911 AMAQI
13th Jul 20263612 PMAQI
13th Jul 2026361 PMAQI
13th Jul 2026322 PMAQI
13th Jul 2026313 PMAQI
13th Jul 2026314 PMAQI
13th Jul 2026445 PMAQI
13th Jul 2026346 PMAQI
13th Jul 2026417 PMAQI
13th Jul 2026418 PMAQI
13th Jul 2026349 PMAQI
13th Jul 20263910 PMAQI
13th Jul 20262511 PMAQI
14th Jul 20263212 AMAQI
14th Jul 2026461 AMAQI
14th Jul 2026212 AMAQI
14th Jul 2026413 AMAQI
14th Jul 2026324 AMAQI
25°C16/33°C
14th Jul 2026305 AMAQI
14th Jul 2026316 AMAQI
14th Jul 2026527 AMAQI
14th Jul 2026418 AMAQI
14th Jul 2026329 AMAQI
14th Jul 20263610 AMAQI
14th Jul 20264411 AMAQI
14th Jul 20264212 PMAQI
14th Jul 2026441 PMAQI
14th Jul 2026442 PMAQI
14th Jul 2026473 PMAQI
14th Jul 2026374 PMAQI
14th Jul 2026385 PMAQI
14th Jul 2026326 PMAQI
14th Jul 2026347 PMAQI
14th Jul 2026328 PMAQI
14th Jul 2026329 PMAQI
14th Jul 20262510 PMAQI
14th Jul 20262411 PMAQI
15th Jul 20262212 AMAQI
15th Jul 2026201 AMAQI
15th Jul 2026202 AMAQI
15th Jul 2026563 AMAQI
15th Jul 2026254 AMAQI
29°C21/38°C
15th Jul 2026245 AMAQI
15th Jul 2026226 AMAQI
15th Jul 2026267 AMAQI
15th Jul 2026258 AMAQI
15th Jul 2026299 AMAQI
15th Jul 20262710 AMAQI
15th Jul 20263811 AMAQI
15th Jul 20265512 PMAQI
15th Jul 2026591 PMAQI
15th Jul 2026622 PMAQI
15th Jul 2026583 PMAQI
15th Jul 20261164 PMAQI
15th Jul 2026535 PMAQI
15th Jul 2026506 PMAQI
15th Jul 2026697 PMAQI
15th Jul 2026448 PMAQI
15th Jul 2026449 PMAQI
15th Jul 20266210 PMAQI
15th Jul 20264611 PMAQI
16th Jul 20264812 AMAQI
16th Jul 2026631 AMAQI
16th Jul 2026652 AMAQI
16th Jul 2026633 AMAQI
16th Jul 2026484 AMAQI
27°C22/32°C
16th Jul 2026685 AMAQI
16th Jul 2026686 AMAQI
16th Jul 2026607 AMAQI
16th Jul 2026808 AMAQI
16th Jul 2026839 AMAQI
16th Jul 20269610 AMAQI
16th Jul 20269411 AMAQI
16th Jul 20268712 PMAQI
16th Jul 2026761 PMAQI
16th Jul 2026842 PMAQI
16th Jul 2026843 PMAQI
16th Jul 2026864 PMAQI
16th Jul 2026865 PMAQI
16th Jul 2026856 PMAQI
16th Jul 2026817 PMAQI
16th Jul 2026868 PMAQI
16th Jul 2026849 PMAQI
16th Jul 20268210 PMAQI
16th Jul 20268111 PMAQI
17th Jul 20267412 AMAQI
17th Jul 2026791 AMAQI
17th Jul 2026782 AMAQI
17th Jul 2026623 AMAQI
17th Jul 2026684 AMAQI
24°C20/30°C
17th Jul 2026695 AMAQI
17th Jul 2026676 AMAQI
17th Jul 2026677 AMAQI
17th Jul 2026728 AMAQI
17th Jul 2026769 AMAQI
17th Jul 202612610 AMAQI
17th Jul 202617011 AMAQI
17th Jul 202615812 PMAQI
17th Jul 20261621 PMAQI
17th Jul 20261662 PMAQI
17th Jul 20261643 PMAQI
17th Jul 20261544 PMAQI
17th Jul 20261565 PMAQI
17th Jul 20261606 PMAQI
17th Jul 20261547 PMAQI
17th Jul 20261048 PMAQI
17th Jul 2026659 PMAQI
17th Jul 20269610 PMAQI
17th Jul 202612411 PMAQI
18th Jul 202612512 AMAQI
18th Jul 20261241 AMAQI
18th Jul 20261282 AMAQI
18th Jul 20261323 AMAQI
18th Jul 20261494 AMAQI
23°C17/30°C
18th Jul 20261355 AMAQI
18th Jul 20261566 AMAQI
18th Jul 20261607 AMAQI
18th Jul 20261758 AMAQI
18th Jul 20261789 AMAQI
18th Jul 202617810 AMAQI
18th Jul 202616711 AMAQI
18th Jul 202615812 PMAQI
18th Jul 2026661 PMAQI
18th Jul 2026722 PMAQI
18th Jul 2026743 PMAQI
18th Jul 2026694 PMAQI
18th Jul 2026645 PMAQI
18th Jul 2026626 PMAQI
18th Jul 2026667 PMAQI
18th Jul 20261508 PMAQI
18th Jul 20261449 PMAQI
18th Jul 202615210 PMAQI
18th Jul 202615011 PMAQI
19th Jul 20269612 AMAQI
19th Jul 2026621 AMAQI
19th Jul 2026602 AMAQI
19th Jul 2026533 AMAQI
19th Jul 2026524 AMAQI
24°C19/35°C
19th Jul 2026565 AMAQI
19th Jul 2026656 AMAQI
19th Jul 2026677 AMAQI
19th Jul 2026788 AMAQI
19th Jul 2026929 AMAQI
19th Jul 20267010 AMAQI
19th Jul 20266411 AMAQI
19th Jul 20264812 PMAQI
19th Jul 2026521 PMAQI
19th Jul 2026632 PMAQI
19th Jul 2026243 PMAQI
19th Jul 2026264 PMAQI
19th Jul 2026255 PMAQI
19th Jul 2026386 PMAQI
19th Jul 2026217 PMAQI
19th Jul 2026288 PMAQI
19th Jul 2026289 PMAQI
19th Jul 20262210 PMAQI
19th Jul 20262311 PMAQI
20th Jul 20262512 AMAQI
20th Jul 2026441 AMAQI
20th Jul 2026522 AMAQI
20th Jul 2026533 AMAQI
20th Jul 2026574 AMAQI
21°C16/27°C
20th Jul 2026545 AMAQI
20th Jul 2026296 AMAQI
20th Jul 2026297 AMAQI
20th Jul 2026288 AMAQI
20th Jul 2026319 AMAQI
20th Jul 20262510 AMAQI
20th Jul 20262711 AMAQI
20th Jul 20262412 PMAQI
20th Jul 2026301 PMAQI
20th Jul 2026202 PMAQI
20th Jul 2026383 PMAQI
20th Jul 2026334 PMAQI
20th Jul 2026445 PMAQI
20th Jul 2026466 PMAQI
20th Jul 2026767 PMAQI
20th Jul 2026818 PMAQI
20th Jul 2026809 PMAQI
20th Jul 20268210 PMAQI
21st Jul 20268812 AMAQI
21st Jul 2026781 AMAQI
21st Jul 2026882 AMAQI
21st Jul 2026663 AMAQI
21st Jul 2026794 AMAQI
21°C14/28°C
21st Jul 2026665 AMAQI
21st Jul 2026606 AMAQI
21st Jul 2026677 AMAQI
21st Jul 2026698 AMAQI
21st Jul 2026709 AMAQI
21st Jul 20267210 AMAQI
21st Jul 20267411 AMAQI
21st Jul 20267612 PMAQI
21st Jul 2026681 PMAQI
21st Jul 2026602 PMAQI
21st Jul 2026383 PMAQI
21st Jul 2026294 PMAQI
21st Jul 2026265 PMAQI
21st Jul 2026226 PMAQI
21st Jul 2026247 PMAQI
21st Jul 2026268 PMAQI
21st Jul 2026259 PMAQI
21st Jul 20262910 PMAQI
21st Jul 20262311 PMAQI
22nd Jul 20262712 AMAQI
22nd Jul 2026211 AMAQI
22nd Jul 2026182 AMAQI
22nd Jul 2026143 AMAQI
22nd Jul 2026224 AMAQI
23°C19/30°C
22nd Jul 2026255 AMAQI
22nd Jul 2026246 AMAQI
22nd Jul 2026277 AMAQI
22nd Jul 2026238 AMAQI
22nd Jul 2026249 AMAQI
22nd Jul 20262810 AMAQI
22nd Jul 20262811 AMAQI
22nd Jul 20262312 PMAQI
22nd Jul 2026241 PMAQI
22nd Jul 2026202 PMAQI
22nd Jul 2026213 PMAQI
22nd Jul 2026204 PMAQI
22nd Jul 2026235 PMAQI
22nd Jul 2026206 PMAQI
22nd Jul 2026267 PMAQI
22nd Jul 2026248 PMAQI
22nd Jul 2026249 PMAQI
22nd Jul 20261910 PMAQI
22nd Jul 20261811 PMAQI
23rd Jul 20261912 AMAQI
23rd Jul 2026221 AMAQI
23rd Jul 2026202 AMAQI
23rd Jul 2026203 AMAQI
23rd Jul 2026464 AMAQI
18°C15/24°C
23rd Jul 2026425 AMAQI
23rd Jul 2026486 AMAQI
23rd Jul 2026587 AMAQI
23rd Jul 2026548 AMAQI
23rd Jul 2026409 AMAQI
23rd Jul 20262610 AMAQI
23rd Jul 20262611 AMAQI
23rd Jul 20262812 PMAQI
23rd Jul 2026241 PMAQI
23rd Jul 2026252 PMAQI
23rd Jul 2026273 PMAQI
23rd Jul 2026254 PMAQI
23rd Jul 2026245 PMAQI
23rd Jul 2026276 PMAQI
23rd Jul 2026237 PMAQI
23rd Jul 2026248 PMAQI
23rd Jul 2026259 PMAQI
23rd Jul 20262210 PMAQI
23rd Jul 20262511 PMAQI
24th Jul 20262512 AMAQI
24th Jul 2026211 AMAQI
24th Jul 2026252 AMAQI
24th Jul 2026243 AMAQI
24th Jul 2026234 AMAQI
19°C12/27°C
24th Jul 2026245 AMAQI
24th Jul 2026256 AMAQI
24th Jul 2026257 AMAQI
24th Jul 2026428 AMAQI
24th Jul 2026279 AMAQI
24th Jul 20262910 AMAQI
24th Jul 20264211 AMAQI
24th Jul 20265212 PMAQI
24th Jul 2026461 PMAQI
24th Jul 2026362 PMAQI
24th Jul 2026383 PMAQI
24th Jul 2026314 PMAQI
24th Jul 2026275 PMAQI
24th Jul 2026256 PMAQI
24th Jul 2026277 PMAQI
24th Jul 2026268 PMAQI
24th Jul 2026259 PMAQI
24th Jul 20262110 PMAQI
24th Jul 20262511 PMAQI
25th Jul 20262512 AMAQI
25th Jul 2026381 AMAQI
25th Jul 2026382 AMAQI
25th Jul 2026383 AMAQI
25th Jul 2026404 AMAQI
20°C13/27°C
25th Jul 2026405 AMAQI
25th Jul 2026236 AMAQI
25th Jul 2026257 AMAQI
25th Jul 2026218 AMAQI
25th Jul 2026239 AMAQI
25th Jul 20262110 AMAQI
25th Jul 20262111 AMAQI
25th Jul 20262112 PMAQI
25th Jul 2026211 PMAQI
25th Jul 2026212 PMAQI
25th Jul 2026213 PMAQI
25th Jul 2026214 PMAQI
25th Jul 2026215 PMAQI
25th Jul 2026216 PMAQI
25th Jul 2026217 PMAQI
25th Jul 2026218 PMAQI
25th Jul 2026229 PMAQI
25th Jul 20262510 PMAQI
25th Jul 20262311 PMAQI
26th Jul 20262112 AMAQI
26th Jul 2026211 AMAQI
26th Jul 2026322 AMAQI
26th Jul 2026323 AMAQI
26th Jul 2026214 AMAQI
22°C15/30°C
26th Jul 2026215 AMAQI
26th Jul 2026216 AMAQI
26th Jul 2026217 AMAQI
26th Jul 2026228 AMAQI
26th Jul 2026219 AMAQI
26th Jul 20262510 AMAQI
26th Jul 20262311 AMAQI
26th Jul 20262312 PMAQI
26th Jul 2026251 PMAQI
26th Jul 2026222 PMAQI
26th Jul 2026233 PMAQI
26th Jul 2026234 PMAQI
26th Jul 2026235 PMAQI
26th Jul 2026236 PMAQI
26th Jul 2026217 PMAQI
26th Jul 2026238 PMAQI
26th Jul 2026239 PMAQI
26th Jul 20262510 PMAQI
26th Jul 20262311 PMAQI
27th Jul 20262512 AMAQI
27th Jul 2026251 AMAQI
27th Jul 2026252 AMAQI
27th Jul 2026273 AMAQI
27th Jul 2026274 AMAQI
23°C17/30°C
27th Jul 2026275 AMAQI
27th Jul 2026276 AMAQI
27th Jul 2026537 AMAQI
27th Jul 2026298 AMAQI
27th Jul 2026299 AMAQI
27th Jul 20263610 AMAQI
27th Jul 20264211 AMAQI
27th Jul 20264012 PMAQI
27th Jul 2026361 PMAQI
27th Jul 2026362 PMAQI
27th Jul 2026363 PMAQI
27th Jul 2026424 PMAQI
27th Jul 2026425 PMAQI
27th Jul 2026466 PMAQI
27th Jul 2026487 PMAQI
27th Jul 2026548 PMAQI
27th Jul 2026539 PMAQI
27th Jul 20265310 PMAQI
27th Jul 20265211 PMAQI
28th Jul 20264212 AMAQI
28th Jul 2026541 AMAQI
28th Jul 2026592 AMAQI
28th Jul 2026553 AMAQI
28th Jul 2026524 AMAQI
24°C18/32°C
28th Jul 2026445 AMAQI
28th Jul 2026386 AMAQI
28th Jul 2026367 AMAQI
28th Jul 2026388 AMAQI
28th Jul 2026389 AMAQI
28th Jul 20264010 AMAQI
28th Jul 20264811 AMAQI
28th Jul 20264812 PMAQI
28th Jul 2026461 PMAQI
28th Jul 2026462 PMAQI
28th Jul 2026503 PMAQI
28th Jul 2026484 PMAQI
28th Jul 2026465 PMAQI
28th Jul 2026466 PMAQI
28th Jul 2026387 PMAQI
28th Jul 2026368 PMAQI
28th Jul 2026339 PMAQI
28th Jul 20263310 PMAQI
28th Jul 20262911 PMAQI
29th Jul 20262912 AMAQI
29th Jul 2026271 AMAQI
29th Jul 2026252 AMAQI
29th Jul 2026253 AMAQI
29th Jul 2026254 AMAQI
23°C20/26°C
29th Jul 2026265 AMAQI
29th Jul 2026256 AMAQI
29th Jul 2026267 AMAQI
29th Jul 2026218 AMAQI
29th Jul 2026219 AMAQI
29th Jul 20262210 AMAQI
29th Jul 20262111 AMAQI
29th Jul 20262512 PMAQI
29th Jul 2026211 PMAQI
29th Jul 2026212 PMAQI
29th Jul 2026213 PMAQI
29th Jul 2026224 PMAQI
29th Jul 2026225 PMAQI
29th Jul 2026246 PMAQI
29th Jul 2026367 PMAQI
29th Jul 2026218 PMAQI
29th Jul 2026219 PMAQI
29th Jul 20262110 PMAQI
29th Jul 20262511 PMAQI
30th Jul 20262512 AMAQI
30th Jul 2026271 AMAQI
30th Jul 2026332 AMAQI
30th Jul 2026403 AMAQI
30th Jul 2026364 AMAQI
22°C18/28°C
30th Jul 2026275 AMAQI
5 AM30th Jul 2026276 AMAQI
30th Jul 2026277 AMAQI
30th Jul 2026268 AMAQI
30th Jul 2026229 AMAQI
30th Jul 20262510 AMAQI
30th Jul 20262511 AMAQI
30th Jul 20262512 PMAQI
12 PM30th Jul 2026251 PMAQI
30th Jul 2026252 PMAQI
30th Jul 2026243 PMAQI
30th Jul 2026254 PMAQI
30th Jul 2026235 PMAQI
30th Jul 2026236 PMAQI
30th Jul 2026257 PMAQI
30th Jul 2026278 PMAQI
8 PM30th Jul 2026389 PMAQI
30th Jul 20263310 PMAQI
30th Jul 20263311 PMAQI
12 AM
4 AM
22°C17/28°C
Day time
Avg. Highest Time
11 AM - 12 PM
47AQI
2 hours / Day
60 hours / Month
Avg. Lowest Time
5 AM - 6 AM
40AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 12 PM (Avg. 47), while the lowest AQI was between 5 AM to 6 AM (Avg. 40).
Night time
Avg. Highest Time
3 AM - 4 AM
42AQI
2 hours / Day
60 hours / Month
Avg. Lowest Time
12 AM
36AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 AM to 4 AM (Avg. 42), while the lowest AQI was between 12 AM to 12 AM (Avg. 36).
2026 Days Vs Air Quality
St Catharines, Ontario, Canada
2026
92%
191
8%
16
Total number of days with different AQI categories in last 211 days in 2026 (154 days remaining)
Good
191 DaysModerate
16 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2026, 92% of 211 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
St Catharines, 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
14AQI (US)
14AQI (US)
2nd January 2026
16AQI (US)
16AQI (US)
3rd January 2026
16AQI (US)
16AQI (US)
4th January 2026
24AQI (US)
24AQI (US)
5th January 2026
36AQI (US)
36AQI (US)
6th January 2026
71AQI (US)
71AQI (US)
7th January 2026
56AQI (US)
56AQI (US)
8th January 2026
49AQI (US)
49AQI (US)
9th January 2026
22AQI (US)
22AQI (US)
10th January 2026
16AQI (US)
16AQI (US)
11th January 2026
18AQI (US)
18AQI (US)
12th January 2026
20AQI (US)
20AQI (US)
13th January 2026
28AQI (US)
28AQI (US)
14th January 2026
31AQI (US)
31AQI (US)
15th January 2026
11AQI (US)
11AQI (US)
16th January 2026
17AQI (US)
17AQI (US)
17th January 2026
25AQI (US)
25AQI (US)
18th January 2026
22AQI (US)
22AQI (US)
19th January 2026
24AQI (US)
24AQI (US)
20th January 2026
18AQI (US)
18AQI (US)
21st January 2026
22AQI (US)
22AQI (US)
22nd January 2026
50AQI (US)
50AQI (US)
23rd January 2026
54AQI (US)
54AQI (US)
24th January 2026
47AQI (US)
47AQI (US)
25th January 2026
47AQI (US)
47AQI (US)
26th January 2026
47AQI (US)
47AQI (US)
27th January 2026
41AQI (US)
41AQI (US)
28th January 2026
46AQI (US)
46AQI (US)
29th January 2026
50AQI (US)
50AQI (US)
30th January 2026
55AQI (US)
55AQI (US)
31st January 2026
45AQI (US)
45AQI (US)
1st February 2026
45AQI (US)
45AQI (US)
2nd February 2026
54AQI (US)
54AQI (US)
3rd February 2026
50AQI (US)
50AQI (US)
4th February 2026
47AQI (US)
47AQI (US)
5th February 2026
49AQI (US)
49AQI (US)
6th February 2026
50AQI (US)
50AQI (US)
7th February 2026
40AQI (US)
40AQI (US)
8th February 2026
46AQI (US)
46AQI (US)
9th February 2026
45AQI (US)
45AQI (US)
10th February 2026
45AQI (US)
45AQI (US)
11th February 2026
40AQI (US)
40AQI (US)
12th February 2026
39AQI (US)
39AQI (US)
13th February 2026
47AQI (US)
47AQI (US)
14th February 2026
49AQI (US)
49AQI (US)
15th February 2026
45AQI (US)
45AQI (US)
16th February 2026
45AQI (US)
45AQI (US)
17th February 2026
60AQI (US)
60AQI (US)
18th February 2026
44AQI (US)
44AQI (US)
19th February 2026
41AQI (US)
41AQI (US)
20th February 2026
42AQI (US)
42AQI (US)
21st February 2026
37AQI (US)
37AQI (US)
22nd February 2026
37AQI (US)
37AQI (US)
23rd February 2026
38AQI (US)
38AQI (US)
24th February 2026
46AQI (US)
46AQI (US)
25th February 2026
44AQI (US)
44AQI (US)
26th February 2026
35AQI (US)
35AQI (US)
27th February 2026
37AQI (US)
37AQI (US)
28th February 2026
35AQI (US)
35AQI (US)
1st March 2026
38AQI (US)
38AQI (US)
2nd March 2026
62AQI (US)
62AQI (US)
3rd March 2026
48AQI (US)
48AQI (US)
4th March 2026
49AQI (US)
49AQI (US)
5th March 2026
42AQI (US)
42AQI (US)
6th March 2026
38AQI (US)
38AQI (US)
7th March 2026
37AQI (US)
37AQI (US)
8th March 2026
38AQI (US)
38AQI (US)
9th March 2026
37AQI (US)
37AQI (US)
10th March 2026
35AQI (US)
35AQI (US)
11th March 2026
41AQI (US)
41AQI (US)
12th March 2026
41AQI (US)
41AQI (US)
13th March 2026
40AQI (US)
40AQI (US)
14th March 2026
36AQI (US)
36AQI (US)
15th March 2026
33AQI (US)
33AQI (US)
16th March 2026
39AQI (US)
39AQI (US)
17th March 2026
34AQI (US)
34AQI (US)
18th March 2026
32AQI (US)
32AQI (US)
19th March 2026
39AQI (US)
39AQI (US)
20th March 2026
41AQI (US)
41AQI (US)
21st March 2026
38AQI (US)
38AQI (US)
22nd March 2026
38AQI (US)
38AQI (US)
23rd March 2026
41AQI (US)
41AQI (US)
24th March 2026
37AQI (US)
37AQI (US)
25th March 2026
36AQI (US)
36AQI (US)
26th March 2026
36AQI (US)
36AQI (US)
27th March 2026
28AQI (US)
28AQI (US)
28th March 2026
31AQI (US)
31AQI (US)
29th March 2026
30AQI (US)
30AQI (US)
30th March 2026
26AQI (US)
26AQI (US)
31st March 2026
28AQI (US)
28AQI (US)
1st April 2026
30AQI (US)
30AQI (US)
2nd April 2026
30AQI (US)
30AQI (US)
3rd April 2026
30AQI (US)
30AQI (US)
4th April 2026
32AQI (US)
32AQI (US)
5th April 2026
30AQI (US)
30AQI (US)
6th April 2026
31AQI (US)
31AQI (US)
7th April 2026
27AQI (US)
27AQI (US)
8th April 2026
34AQI (US)
34AQI (US)
9th April 2026
29AQI (US)
29AQI (US)
10th April 2026
31AQI (US)
31AQI (US)
11th April 2026
30AQI (US)
30AQI (US)
12th April 2026
30AQI (US)
30AQI (US)
13th April 2026
33AQI (US)
33AQI (US)
14th April 2026
38AQI (US)
38AQI (US)
15th April 2026
37AQI (US)
37AQI (US)
16th April 2026
32AQI (US)
32AQI (US)
17th April 2026
18th April 2026
30AQI (US)
30AQI (US)
19th April 2026
33AQI (US)
33AQI (US)
20th April 2026
28AQI (US)
28AQI (US)
21st April 2026
28AQI (US)
28AQI (US)
22nd April 2026
23rd April 2026
24AQI (US)
24AQI (US)
24th April 2026
25AQI (US)
25AQI (US)
25th April 2026
28AQI (US)
28AQI (US)
26th April 2026
33AQI (US)
33AQI (US)
27th April 2026
27AQI (US)
27AQI (US)
28th April 2026
26AQI (US)
26AQI (US)
29th April 2026
23AQI (US)
23AQI (US)
30th April 2026
26AQI (US)
26AQI (US)
1st May 2026
26AQI (US)
26AQI (US)
2nd May 2026
23AQI (US)
23AQI (US)
3rd May 2026
23AQI (US)
23AQI (US)
4th May 2026
35AQI (US)
35AQI (US)
5th May 2026
38AQI (US)
38AQI (US)
6th May 2026
31AQI (US)
31AQI (US)
7th May 2026
27AQI (US)
27AQI (US)
8th May 2026
29AQI (US)
29AQI (US)
9th May 2026
10th May 2026
30AQI (US)
30AQI (US)
11th May 2026
27AQI (US)
27AQI (US)
12th May 2026
26AQI (US)
26AQI (US)
13th May 2026
35AQI (US)
35AQI (US)
14th May 2026
22AQI (US)
22AQI (US)
15th May 2026
46AQI (US)
46AQI (US)
16th May 2026
52AQI (US)
52AQI (US)
17th May 2026
56AQI (US)
56AQI (US)
18th May 2026
57AQI (US)
57AQI (US)
19th May 2026
55AQI (US)
55AQI (US)
20th May 2026
52AQI (US)
52AQI (US)
21st May 2026
45AQI (US)
45AQI (US)
22nd May 2026
44AQI (US)
44AQI (US)
23rd May 2026
50AQI (US)
50AQI (US)
24th May 2026
47AQI (US)
47AQI (US)
25th May 2026
45AQI (US)
45AQI (US)
26th May 2026
34AQI (US)
34AQI (US)
27th May 2026
30AQI (US)
30AQI (US)
28th May 2026
28AQI (US)
28AQI (US)
29th May 2026
26AQI (US)
26AQI (US)
30th May 2026
28AQI (US)
28AQI (US)
31st May 2026
29AQI (US)
29AQI (US)
1st June 2026
31AQI (US)
31AQI (US)
2nd June 2026
32AQI (US)
32AQI (US)
3rd June 2026
32AQI (US)
32AQI (US)
4th June 2026
30AQI (US)
30AQI (US)
5th June 2026
32AQI (US)
32AQI (US)
6th June 2026
28AQI (US)
28AQI (US)
7th June 2026
25AQI (US)
25AQI (US)
8th June 2026
26AQI (US)
26AQI (US)
9th June 2026
30AQI (US)
30AQI (US)
10th June 2026
31AQI (US)
31AQI (US)
11th June 2026
30AQI (US)
30AQI (US)
12th June 2026
27AQI (US)
27AQI (US)
13th June 2026
26AQI (US)
26AQI (US)
14th June 2026
26AQI (US)
26AQI (US)
15th June 2026
26AQI (US)
26AQI (US)
16th June 2026
28AQI (US)
28AQI (US)
17th June 2026
28AQI (US)
28AQI (US)
18th June 2026
28AQI (US)
28AQI (US)
19th June 2026
26AQI (US)
26AQI (US)
20th June 2026
25AQI (US)
25AQI (US)
21st June 2026
23AQI (US)
23AQI (US)
22nd June 2026
26AQI (US)
26AQI (US)
23rd June 2026
25AQI (US)
25AQI (US)
24th June 2026
24AQI (US)
24AQI (US)
25th June 2026
26AQI (US)
26AQI (US)
26th June 2026
30AQI (US)
30AQI (US)
27th June 2026
33AQI (US)
33AQI (US)
28th June 2026
28AQI (US)
28AQI (US)
29th June 2026
26AQI (US)
26AQI (US)
30th June 2026
26AQI (US)
26AQI (US)
1st July 2026
34AQI (US)
34AQI (US)
2nd July 2026
42AQI (US)
42AQI (US)
3rd July 2026
30AQI (US)
30AQI (US)
4th July 2026
28AQI (US)
28AQI (US)
5th July 2026
29AQI (US)
29AQI (US)
6th July 2026
28AQI (US)
28AQI (US)
7th July 2026
33AQI (US)
33AQI (US)
8th July 2026
28AQI (US)
28AQI (US)
9th July 2026
30AQI (US)
30AQI (US)
10th July 2026
37AQI (US)
37AQI (US)
11th July 2026
32AQI (US)
32AQI (US)
12th July 2026
47AQI (US)
47AQI (US)
13th July 2026
39AQI (US)
39AQI (US)
14th July 2026
36AQI (US)
36AQI (US)
15th July 2026
44AQI (US)
44AQI (US)
16th July 2026
76AQI (US)
76AQI (US)
17th July 2026
90AQI (US)
90AQI (US)
18th July 2026
95AQI (US)
95AQI (US)
19th July 2026
48AQI (US)
48AQI (US)
20th July 2026
45AQI (US)
45AQI (US)
21st July 2026
54AQI (US)
54AQI (US)
22nd July 2026
28AQI (US)
28AQI (US)
23rd July 2026
34AQI (US)
34AQI (US)
24th July 2026
30AQI (US)
30AQI (US)
25th July 2026
28AQI (US)
28AQI (US)
26th July 2026
32AQI (US)
32AQI (US)
27th July 2026
43AQI (US)
43AQI (US)
28th July 2026
46AQI (US)
46AQI (US)
29th July 2026
24AQI (US)
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
33AQI (US)
44AQI (US)
38AQI (US)
30AQI (US)
37AQI (US)
28AQI (US)
41AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202636AQI (US)
27
4
26
2
30
1
28
25
5
30
25
4
191
16
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
June28AQI (US)
202533AQI (US)
30
1
26
2
29
2
30
31
20
10
24
7
19
11
1
30
28
3
27
3
29
2
323
41
1
Highest AQI (US) recorded in
August45AQI (US)
Lowest AQI (US) recorded in
May21AQI (US)
202432AQI (US)
29
1
26
3
31
30
31
29
29
2
23
8
28
2
30
1
30
30
1
346
18
Highest AQI (US) recorded in
February37AQI (US)
Lowest AQI (US) recorded in
November23AQI (US)
202339AQI (US)
28
3
27
1
30
1
27
3
28
3
11
13
4
2
23
6
2
22
9
29
1
30
1
29
27
3
311
44
6
2
Highest AQI (US) recorded in
June73AQI (US)
Lowest AQI (US) recorded in
October26AQI (US)
202231AQI (US)
28
2
22
29
2
17
31
29
1
19
1
1
1
29
30
1
27
3
29
2
291
12
1
Highest AQI (US) recorded in
July42AQI (US)
Lowest AQI (US) recorded in
August20AQI (US)
202133AQI (US)
23
6
26
2
28
3
28
2
29
2
30
26
5
31
30
26
5
28
2
30
1
335
28
Highest AQI (US) recorded in
February38AQI (US)
Lowest AQI (US) recorded in
September24AQI (US)
202032AQI (US)
13
21
18
30
30
1
31
28
2
29
2
27
3
26
5
253
13
Highest AQI (US) recorded in
June36AQI (US)
Lowest AQI (US) recorded in
October28AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Most Polluted Year Recorded
2023(Avg.)
39AQI (US)Least Polluted Year Recorded
2022(Avg.)
31AQI (US)St Catharines's annual 2026 AQI (US) (36) shows an average percentage change of 8.6% (worsened AQI (US)) compared to previous years: 2020 (32), 2021 (33), 2022 (31), 2023 (39), 2024 (32), 2025 (33).
