Country Background

Ottawa Downtown, Ottawa, 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+

October Air Quality Analysis

Ottawa Downtown, Ottawa, Ontario, Canada

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
2nd Oct 2023
59AQI
Lowest AQI recorded on
12th Oct 2023
10AQI


Same Day Analysis (2nd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 42 of Good air quality, showing improvement over 2023 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 2nd Oct - 3rd Oct 2025

Ottawa Downtown, Ottawa, Ontario, Canada

AQI
Day
Night
.

6 AM2nd Oct 2025

7 PM

5 AM3rd Oct 2025

Day time
Avg. Highest Time
11AM2nd Oct

48AQI

Avg. Lowest Time
7AM2nd Oct

36AQI

Night time
Avg. Highest Time
10PM2nd Oct

53AQI

Avg. Lowest Time
6AM2nd Oct

33AQI

In the last 24 hours,

Ottawa Downtown's AQI reached its highest point of 53 at 10 PM during the Night, while the lowest point, 33, was recorded at 6 AM during the Night between 2nd Oct and 3rd Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Ottawa Downtown, Ottawa, Ontario, Canada

SepOct
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 - 01st01st - 02nd02nd - 03rd03rd
Day
Night
3rd Sep 2025336 AMAQI
3rd Sep 2025337 AMAQI
3rd Sep 2025338 AMAQI
3rd Sep 2025349 AMAQI
3rd Sep 20253410 AMAQI
3rd Sep 20253511 AMAQI
3rd Sep 20253412 PMAQI
3rd Sep 2025321 PMAQI
3rd Sep 2025282 PMAQI
3rd Sep 2025263 PMAQI
3rd Sep 2025274 PMAQI
3rd Sep 2025265 PMAQI
3rd Sep 2025256 PMAQI
3rd Sep 2025247 PMAQI
3rd Sep 2025248 PMAQI
3rd Sep 2025329 PMAQI
3rd Sep 20252810 PMAQI
3rd Sep 20252311 PMAQI
4th Sep 20252512 AMAQI
4th Sep 2025241 AMAQI
4th Sep 2025232 AMAQI
4th Sep 2025233 AMAQI
4th Sep 2025234 AMAQI
4th Sep 2025295 AMAQI

21°C14/29°C

4th Sep 2025306 AMAQI
4th Sep 2025307 AMAQI
4th Sep 2025308 AMAQI
4th Sep 2025309 AMAQI
4th Sep 20252610 AMAQI
4th Sep 20252211 AMAQI
4th Sep 20252412 PMAQI
4th Sep 2025251 PMAQI
4th Sep 2025302 PMAQI
4th Sep 2025303 PMAQI
4th Sep 2025324 PMAQI
4th Sep 2025325 PMAQI
4th Sep 2025276 PMAQI
4th Sep 2025237 PMAQI
4th Sep 2025218 PMAQI
4th Sep 2025249 PMAQI
4th Sep 20252210 PMAQI
4th Sep 20252011 PMAQI
5th Sep 20251912 AMAQI
5th Sep 2025221 AMAQI
5th Sep 2025212 AMAQI
5th Sep 2025223 AMAQI
5th Sep 2025244 AMAQI
5th Sep 2025255 AMAQI

18°C11/29°C

5th Sep 2025246 AMAQI
5th Sep 2025237 AMAQI
5th Sep 2025258 AMAQI
5th Sep 2025329 AMAQI
5th Sep 20252410 AMAQI
5th Sep 20252411 AMAQI
5th Sep 20252412 PMAQI
5th Sep 2025271 PMAQI
5th Sep 2025262 PMAQI
5th Sep 2025283 PMAQI
5th Sep 2025324 PMAQI
5th Sep 2025365 PMAQI
5th Sep 2025406 PMAQI
5th Sep 2025457 PMAQI
5th Sep 2025458 PMAQI
5th Sep 2025269 PMAQI
5th Sep 20254810 PMAQI
5th Sep 20254611 PMAQI
6th Sep 20254312 AMAQI
6th Sep 2025391 AMAQI
6th Sep 2025342 AMAQI
6th Sep 2025283 AMAQI
6th Sep 2025244 AMAQI
6th Sep 2025225 AMAQI

17°C8/26°C

6th Sep 2025206 AMAQI
6th Sep 2025187 AMAQI
6th Sep 2025188 AMAQI
6th Sep 2025189 AMAQI
6th Sep 20251810 AMAQI
6th Sep 20251911 AMAQI
6th Sep 20252012 PMAQI
6th Sep 2025201 PMAQI
6th Sep 2025192 PMAQI
6th Sep 2025193 PMAQI
6th Sep 2025184 PMAQI
6th Sep 2025195 PMAQI
6th Sep 2025176 PMAQI
6th Sep 2025187 PMAQI
6th Sep 2025188 PMAQI
6th Sep 2025199 PMAQI
6th Sep 20251810 PMAQI
6th Sep 20252011 PMAQI
7th Sep 20252012 AMAQI
7th Sep 2025221 AMAQI
7th Sep 2025212 AMAQI
7th Sep 2025203 AMAQI
7th Sep 2025224 AMAQI
7th Sep 2025215 AMAQI

16°C10/21°C

7th Sep 2025216 AMAQI
7th Sep 2025217 AMAQI
7th Sep 2025208 AMAQI
7th Sep 2025199 AMAQI
7th Sep 20251910 AMAQI
7th Sep 20252011 AMAQI
7th Sep 20251912 PMAQI
7th Sep 2025171 PMAQI
7th Sep 2025162 PMAQI
7th Sep 2025163 PMAQI
7th Sep 2025154 PMAQI
7th Sep 2025145 PMAQI
7th Sep 2025146 PMAQI
7th Sep 2025147 PMAQI
7th Sep 2025148 PMAQI
7th Sep 2025209 PMAQI
7th Sep 20251810 PMAQI
7th Sep 20251811 PMAQI
8th Sep 20251712 AMAQI
8th Sep 2025191 AMAQI
8th Sep 2025202 AMAQI
8th Sep 2025193 AMAQI
8th Sep 2025204 AMAQI
8th Sep 2025195 AMAQI

15°C11/19°C

8th Sep 2025186 AMAQI
8th Sep 2025207 AMAQI
8th Sep 2025188 AMAQI
8th Sep 2025259 AMAQI
8th Sep 20253610 AMAQI
8th Sep 20253411 AMAQI
8th Sep 20252612 PMAQI
8th Sep 2025201 PMAQI
8th Sep 2025182 PMAQI
8th Sep 2025173 PMAQI
8th Sep 2025164 PMAQI
8th Sep 2025165 PMAQI
8th Sep 2025166 PMAQI
8th Sep 2025167 PMAQI
8th Sep 2025168 PMAQI
8th Sep 2025199 PMAQI
8th Sep 20251710 PMAQI
8th Sep 20251811 PMAQI
9th Sep 20251812 AMAQI
9th Sep 2025171 AMAQI
9th Sep 2025182 AMAQI
9th Sep 2025183 AMAQI
9th Sep 2025184 AMAQI
9th Sep 2025185 AMAQI

15°C7/21°C

9th Sep 2025186 AMAQI
9th Sep 2025187 AMAQI
9th Sep 2025198 AMAQI
9th Sep 2025189 AMAQI
9th Sep 20251810 AMAQI
9th Sep 20252411 AMAQI
9th Sep 20252612 PMAQI
9th Sep 2025281 PMAQI
9th Sep 2025262 PMAQI
9th Sep 2025243 PMAQI
9th Sep 2025244 PMAQI
9th Sep 2025225 PMAQI
9th Sep 2025206 PMAQI
9th Sep 2025207 PMAQI
9th Sep 2025208 PMAQI
9th Sep 2025229 PMAQI
9th Sep 20252110 PMAQI
9th Sep 20252211 PMAQI
10th Sep 20252312 AMAQI
10th Sep 2025251 AMAQI
10th Sep 2025272 AMAQI
10th Sep 2025283 AMAQI
10th Sep 2025284 AMAQI
10th Sep 2025285 AMAQI

15°C5/25°C

10th Sep 2025266 AMAQI
10th Sep 2025237 AMAQI
10th Sep 2025248 AMAQI
10th Sep 2025249 AMAQI
10th Sep 20252610 AMAQI
10th Sep 20252711 AMAQI
10th Sep 20252912 PMAQI
10th Sep 2025291 PMAQI
10th Sep 2025302 PMAQI
10th Sep 2025293 PMAQI
10th Sep 2025284 PMAQI
10th Sep 2025265 PMAQI
10th Sep 2025246 PMAQI
10th Sep 2025227 PMAQI
10th Sep 2025228 PMAQI
10th Sep 2025269 PMAQI
10th Sep 20252710 PMAQI
10th Sep 20253011 PMAQI
11th Sep 20253112 AMAQI
11th Sep 2025291 AMAQI
11th Sep 2025292 AMAQI
11th Sep 2025283 AMAQI
11th Sep 2025284 AMAQI
11th Sep 2025275 AMAQI

18°C7/27°C

11th Sep 2025256 AMAQI
11th Sep 2025247 AMAQI
11th Sep 2025258 AMAQI
11th Sep 2025259 AMAQI
11th Sep 20252910 AMAQI
11th Sep 20252711 AMAQI
11th Sep 20252712 PMAQI
11th Sep 2025271 PMAQI
11th Sep 2025282 PMAQI
11th Sep 2025283 PMAQI
11th Sep 2025304 PMAQI
11th Sep 2025305 PMAQI
11th Sep 2025316 PMAQI
11th Sep 2025327 PMAQI
11th Sep 2025308 PMAQI
11th Sep 2025279 PMAQI
11th Sep 20252410 PMAQI
11th Sep 20252211 PMAQI
12th Sep 20252212 AMAQI
12th Sep 2025221 AMAQI
12th Sep 2025212 AMAQI
12th Sep 2025203 AMAQI
12th Sep 2025204 AMAQI
12th Sep 2025205 AMAQI

18°C11/23°C

12th Sep 2025196 AMAQI
12th Sep 2025207 AMAQI
12th Sep 2025208 AMAQI
12th Sep 2025219 AMAQI
12th Sep 20252110 AMAQI
12th Sep 20252211 AMAQI
12th Sep 20252212 PMAQI
12th Sep 2025221 PMAQI
12th Sep 2025242 PMAQI
12th Sep 2025263 PMAQI
12th Sep 2025234 PMAQI
12th Sep 2025235 PMAQI
12th Sep 2025236 PMAQI
12th Sep 2025247 PMAQI
12th Sep 2025258 PMAQI
12th Sep 2025209 PMAQI
12th Sep 20252410 PMAQI
12th Sep 20252811 PMAQI
13th Sep 20252912 AMAQI
13th Sep 2025341 AMAQI
13th Sep 2025342 AMAQI
13th Sep 2025363 AMAQI
13th Sep 2025364 AMAQI
13th Sep 2025355 AMAQI

16°C8/24°C

13th Sep 2025356 AMAQI
13th Sep 2025317 AMAQI
13th Sep 2025308 AMAQI
13th Sep 2025319 AMAQI
13th Sep 20253010 AMAQI
13th Sep 20252911 AMAQI
13th Sep 20253412 PMAQI
13th Sep 2025331 PMAQI
13th Sep 2025332 PMAQI
13th Sep 2025323 PMAQI
13th Sep 2025304 PMAQI
13th Sep 2025285 PMAQI
13th Sep 2025296 PMAQI
13th Sep 2025307 PMAQI
13th Sep 2025338 PMAQI
13th Sep 2025329 PMAQI
13th Sep 20253410 PMAQI
13th Sep 20253711 PMAQI
14th Sep 20253612 AMAQI
14th Sep 2025401 AMAQI
14th Sep 2025412 AMAQI
14th Sep 2025423 AMAQI
14th Sep 2025414 AMAQI
14th Sep 2025425 AMAQI

19°C12/27°C

14th Sep 2025436 AMAQI
14th Sep 2025417 AMAQI
14th Sep 2025408 AMAQI
14th Sep 2025409 AMAQI
14th Sep 20253810 AMAQI
14th Sep 20253611 AMAQI
14th Sep 20253612 PMAQI
14th Sep 2025351 PMAQI
14th Sep 2025342 PMAQI
14th Sep 2025333 PMAQI
14th Sep 2025334 PMAQI
14th Sep 2025315 PMAQI
14th Sep 2025316 PMAQI
14th Sep 2025297 PMAQI
14th Sep 2025288 PMAQI
14th Sep 2025379 PMAQI
14th Sep 20253410 PMAQI
14th Sep 20253111 PMAQI
15th Sep 20253012 AMAQI
15th Sep 2025271 AMAQI
15th Sep 2025222 AMAQI
15th Sep 2025233 AMAQI
15th Sep 2025214 AMAQI
15th Sep 2025235 AMAQI

18°C13/23°C

15th Sep 2025236 AMAQI
15th Sep 2025217 AMAQI
15th Sep 2025228 AMAQI
15th Sep 2025239 AMAQI
15th Sep 20252910 AMAQI
15th Sep 20253211 AMAQI
15th Sep 20252512 PMAQI
15th Sep 2025231 PMAQI
15th Sep 2025222 PMAQI
15th Sep 2025223 PMAQI
15th Sep 2025224 PMAQI
15th Sep 2025245 PMAQI
15th Sep 2025246 PMAQI
15th Sep 2025247 PMAQI
15th Sep 2025268 PMAQI
15th Sep 2025249 PMAQI
15th Sep 20252510 PMAQI
15th Sep 20252711 PMAQI
16th Sep 20252812 AMAQI
16th Sep 2025271 AMAQI
16th Sep 2025292 AMAQI
16th Sep 2025283 AMAQI
16th Sep 2025294 AMAQI
16th Sep 2025275 AMAQI

19°C10/26°C

16th Sep 2025266 AMAQI
16th Sep 2025247 AMAQI
16th Sep 2025258 AMAQI
16th Sep 2025269 AMAQI
16th Sep 20252810 AMAQI
16th Sep 20252811 AMAQI
16th Sep 20252812 PMAQI
16th Sep 2025321 PMAQI
16th Sep 2025312 PMAQI
16th Sep 2025323 PMAQI
16th Sep 2025294 PMAQI
16th Sep 2025315 PMAQI
16th Sep 2025286 PMAQI
16th Sep 2025287 PMAQI
16th Sep 2025288 PMAQI
16th Sep 2025289 PMAQI
16th Sep 20252810 PMAQI
16th Sep 20253111 PMAQI
17th Sep 20253112 AMAQI
17th Sep 2025321 AMAQI
17th Sep 2025362 AMAQI
17th Sep 2025343 AMAQI
17th Sep 2025344 AMAQI
17th Sep 2025335 AMAQI

19°C10/28°C

17th Sep 2025316 AMAQI
17th Sep 2025317 AMAQI
17th Sep 2025298 AMAQI
17th Sep 2025309 AMAQI
17th Sep 20253110 AMAQI
17th Sep 20253011 AMAQI
17th Sep 20253012 PMAQI
17th Sep 2025311 PMAQI
17th Sep 2025322 PMAQI
17th Sep 2025313 PMAQI
17th Sep 2025334 PMAQI
17th Sep 2025325 PMAQI
17th Sep 2025326 PMAQI
17th Sep 2025327 PMAQI
17th Sep 2025328 PMAQI
17th Sep 2025309 PMAQI
17th Sep 20252910 PMAQI
17th Sep 20253111 PMAQI
18th Sep 20253012 AMAQI
18th Sep 2025301 AMAQI
18th Sep 2025262 AMAQI
18th Sep 2025313 AMAQI
18th Sep 2025294 AMAQI
18th Sep 2025285 AMAQI

19°C11/27°C

18th Sep 2025296 AMAQI
18th Sep 2025287 AMAQI
18th Sep 2025268 AMAQI
18th Sep 2025309 AMAQI
18th Sep 20253010 AMAQI
18th Sep 20253211 AMAQI
18th Sep 20253212 PMAQI
18th Sep 2025301 PMAQI
18th Sep 2025352 PMAQI
18th Sep 2025353 PMAQI
18th Sep 2025364 PMAQI
18th Sep 2025345 PMAQI
18th Sep 2025346 PMAQI
18th Sep 2025347 PMAQI
18th Sep 2025308 PMAQI
18th Sep 2025289 PMAQI
18th Sep 20252810 PMAQI
18th Sep 20252611 PMAQI
19th Sep 20252512 AMAQI
19th Sep 2025231 AMAQI
19th Sep 2025162 AMAQI
19th Sep 2025143 AMAQI
19th Sep 2025144 AMAQI
19th Sep 2025145 AMAQI

19°C12/27°C

19th Sep 2025136 AMAQI
19th Sep 2025137 AMAQI
19th Sep 2025148 AMAQI
19th Sep 2025169 AMAQI
19th Sep 20251610 AMAQI
19th Sep 20251611 AMAQI
19th Sep 20251612 PMAQI
19th Sep 2025161 PMAQI
19th Sep 2025162 PMAQI
19th Sep 2025163 PMAQI
19th Sep 2025164 PMAQI
19th Sep 2025175 PMAQI
19th Sep 2025166 PMAQI
19th Sep 2025177 PMAQI
19th Sep 2025168 PMAQI
19th Sep 2025179 PMAQI
19th Sep 20251710 PMAQI
19th Sep 20251811 PMAQI
20th Sep 20251712 AMAQI
20th Sep 2025181 AMAQI
20th Sep 2025192 AMAQI
20th Sep 2025163 AMAQI
20th Sep 2025154 AMAQI
20th Sep 2025165 AMAQI

13°C9/19°C

20th Sep 2025156 AMAQI
20th Sep 2025157 AMAQI
20th Sep 2025158 AMAQI
20th Sep 2025169 AMAQI
20th Sep 20251610 AMAQI
20th Sep 20251611 AMAQI
20th Sep 20251612 PMAQI
20th Sep 2025161 PMAQI
20th Sep 2025152 PMAQI
20th Sep 2025153 PMAQI
20th Sep 2025164 PMAQI
20th Sep 2025155 PMAQI
20th Sep 2025156 PMAQI
20th Sep 2025167 PMAQI
20th Sep 2025168 PMAQI
20th Sep 2025169 PMAQI
20th Sep 20251710 PMAQI
20th Sep 20251911 PMAQI
21st Sep 20251912 AMAQI
21st Sep 2025201 AMAQI
21st Sep 2025272 AMAQI
21st Sep 2025283 AMAQI
21st Sep 2025264 AMAQI
21st Sep 2025225 AMAQI

12°C5/19°C

21st Sep 2025226 AMAQI
21st Sep 2025217 AMAQI
21st Sep 2025198 AMAQI
21st Sep 2025209 AMAQI
21st Sep 20252010 AMAQI
21st Sep 20252011 AMAQI
21st Sep 20252012 PMAQI
21st Sep 2025211 PMAQI
21st Sep 2025202 PMAQI
21st Sep 2025203 PMAQI
21st Sep 2025194 PMAQI
21st Sep 2025215 PMAQI
21st Sep 2025216 PMAQI
21st Sep 2025217 PMAQI
21st Sep 2025218 PMAQI
21st Sep 2025219 PMAQI
21st Sep 20252210 PMAQI
21st Sep 20252311 PMAQI
22nd Sep 20252312 AMAQI
22nd Sep 2025221 AMAQI
22nd Sep 2025252 AMAQI
22nd Sep 2025263 AMAQI
22nd Sep 2025254 AMAQI
22nd Sep 2025255 AMAQI

12°C2/24°C

22nd Sep 2025226 AMAQI
22nd Sep 2025227 AMAQI
22nd Sep 2025208 AMAQI
22nd Sep 2025219 AMAQI
22nd Sep 20252110 AMAQI
22nd Sep 20252311 AMAQI
22nd Sep 20252412 PMAQI
22nd Sep 2025221 PMAQI
22nd Sep 2025242 PMAQI
22nd Sep 2025253 PMAQI
22nd Sep 2025254 PMAQI
22nd Sep 2025265 PMAQI
22nd Sep 2025266 PMAQI
22nd Sep 2025277 PMAQI
22nd Sep 2025278 PMAQI
22nd Sep 2025249 PMAQI
22nd Sep 20252410 PMAQI
22nd Sep 20252611 PMAQI
23rd Sep 20252412 AMAQI
23rd Sep 2025281 AMAQI
23rd Sep 2025322 AMAQI
23rd Sep 2025383 AMAQI
23rd Sep 2025394 AMAQI
23rd Sep 2025405 AMAQI

16°C13/21°C

23rd Sep 2025396 AMAQI
23rd Sep 2025387 AMAQI
23rd Sep 2025388 AMAQI
23rd Sep 2025369 AMAQI
23rd Sep 20253310 AMAQI
23rd Sep 20253211 AMAQI
23rd Sep 20253112 PMAQI
23rd Sep 2025281 PMAQI
23rd Sep 2025282 PMAQI
23rd Sep 2025283 PMAQI
23rd Sep 2025304 PMAQI
23rd Sep 2025315 PMAQI
23rd Sep 2025326 PMAQI
23rd Sep 2025327 PMAQI
23rd Sep 2025338 PMAQI
23rd Sep 2025339 PMAQI
23rd Sep 20253310 PMAQI
23rd Sep 20253411 PMAQI
24th Sep 20253412 AMAQI
24th Sep 2025331 AMAQI
24th Sep 2025322 AMAQI
24th Sep 2025313 AMAQI
24th Sep 2025344 AMAQI
24th Sep 2025325 AMAQI

19°C17/25°C

24th Sep 2025356 AMAQI
24th Sep 2025367 AMAQI
24th Sep 2025408 AMAQI
24th Sep 2025369 AMAQI
24th Sep 20253110 AMAQI
24th Sep 20252911 AMAQI
24th Sep 20252712 PMAQI
24th Sep 2025261 PMAQI
24th Sep 2025262 PMAQI
24th Sep 2025263 PMAQI
24th Sep 2025304 PMAQI
24th Sep 2025315 PMAQI
24th Sep 2025316 PMAQI
24th Sep 2025317 PMAQI
24th Sep 2025318 PMAQI
24th Sep 2025339 PMAQI
24th Sep 20253110 PMAQI
24th Sep 20253011 PMAQI
25th Sep 20252812 AMAQI
25th Sep 2025261 AMAQI
25th Sep 2025202 AMAQI
25th Sep 2025203 AMAQI
25th Sep 2025194 AMAQI
25th Sep 2025195 AMAQI

18°C14/25°C

25th Sep 2025186 AMAQI
25th Sep 2025187 AMAQI
25th Sep 2025178 AMAQI
25th Sep 2025179 AMAQI
25th Sep 20251910 AMAQI
25th Sep 20252011 AMAQI
25th Sep 20251412 PMAQI
25th Sep 2025161 PMAQI
25th Sep 2025252 PMAQI
25th Sep 2025283 PMAQI
25th Sep 2025254 PMAQI
25th Sep 2025225 PMAQI
25th Sep 2025226 PMAQI
25th Sep 2025217 PMAQI
25th Sep 2025178 PMAQI
25th Sep 2025169 PMAQI
25th Sep 20251710 PMAQI
25th Sep 20251111 PMAQI
26th Sep 20251712 AMAQI
26th Sep 2025171 AMAQI
26th Sep 2025162 AMAQI
26th Sep 2025123 AMAQI
26th Sep 2025154 AMAQI
26th Sep 2025155 AMAQI

17°C15/19°C

26th Sep 2025206 AMAQI
26th Sep 2025207 AMAQI
26th Sep 2025178 AMAQI
26th Sep 2025209 AMAQI
26th Sep 20252210 AMAQI
26th Sep 20252011 AMAQI
26th Sep 20252312 PMAQI
26th Sep 2025281 PMAQI
26th Sep 2025312 PMAQI
26th Sep 2025303 PMAQI
26th Sep 2025284 PMAQI
26th Sep 2025285 PMAQI
26th Sep 2025266 PMAQI
26th Sep 2025227 PMAQI
26th Sep 2025238 PMAQI
26th Sep 2025339 PMAQI
26th Sep 20253210 PMAQI
26th Sep 20252211 PMAQI
27th Sep 20252212 AMAQI
27th Sep 2025221 AMAQI
27th Sep 2025222 AMAQI
27th Sep 2025233 AMAQI
27th Sep 2025234 AMAQI
27th Sep 2025225 AMAQI

17°C14/21°C

27th Sep 2025226 AMAQI
27th Sep 2025227 AMAQI
27th Sep 2025218 AMAQI
27th Sep 2025219 AMAQI
27th Sep 20251710 AMAQI
27th Sep 20251811 AMAQI
27th Sep 20251812 PMAQI
27th Sep 2025181 PMAQI
27th Sep 2025212 PMAQI
27th Sep 2025283 PMAQI
27th Sep 2025284 PMAQI
27th Sep 2025285 PMAQI
27th Sep 2025286 PMAQI
27th Sep 2025287 PMAQI
27th Sep 2025308 PMAQI
27th Sep 2025339 PMAQI
27th Sep 20253310 PMAQI
27th Sep 20253311 PMAQI
28th Sep 20252812 AMAQI
28th Sep 2025201 AMAQI
28th Sep 2025182 AMAQI
28th Sep 2025223 AMAQI
28th Sep 2025174 AMAQI
28th Sep 2025185 AMAQI

16°C11/23°C

28th Sep 2025186 AMAQI
28th Sep 2025237 AMAQI
28th Sep 2025278 AMAQI
28th Sep 2025249 AMAQI
28th Sep 20252410 AMAQI
28th Sep 20252811 AMAQI
28th Sep 20252812 PMAQI
28th Sep 2025271 PMAQI
28th Sep 2025302 PMAQI
28th Sep 2025373 PMAQI
28th Sep 2025354 PMAQI
28th Sep 2025255 PMAQI
28th Sep 2025116 PMAQI
28th Sep 2025197 PMAQI
28th Sep 2025298 PMAQI
28th Sep 2025329 PMAQI
28th Sep 20253710 PMAQI
28th Sep 20254211 PMAQI
29th Sep 20254412 AMAQI
29th Sep 2025491 AMAQI
29th Sep 2025462 AMAQI
29th Sep 2025393 AMAQI
29th Sep 2025354 AMAQI
29th Sep 2025335 AMAQI

19°C14/26°C

29th Sep 2025306 AMAQI
29th Sep 2025297 AMAQI
29th Sep 2025358 AMAQI
29th Sep 2025239 AMAQI
29th Sep 20252210 AMAQI
29th Sep 20253411 AMAQI
29th Sep 20253712 PMAQI
29th Sep 2025341 PMAQI
29th Sep 2025342 PMAQI
29th Sep 2025293 PMAQI
29th Sep 2025344 PMAQI
29th Sep 2025295 PMAQI
29th Sep 2025266 PMAQI
29th Sep 2025317 PMAQI
29th Sep 2025298 PMAQI
29th Sep 2025399 PMAQI
29th Sep 20254010 PMAQI
29th Sep 20254611 PMAQI
30th Sep 20254012 AMAQI
30th Sep 2025371 AMAQI
30th Sep 2025382 AMAQI
30th Sep 2025363 AMAQI
30th Sep 2025394 AMAQI
30th Sep 2025355 AMAQI

18°C10/30°C

30th Sep 2025336 AMAQI
30th Sep 2025297 AMAQI
30th Sep 2025228 AMAQI
30th Sep 2025259 AMAQI
30th Sep 20252510 AMAQI
30th Sep 20252911 AMAQI
30th Sep 20253012 PMAQI
30th Sep 2025281 PMAQI
30th Sep 2025212 PMAQI
30th Sep 2025233 PMAQI
30th Sep 2025214 PMAQI
30th Sep 2025205 PMAQI
30th Sep 2025226 PMAQI
30th Sep 2025207 PMAQI
30th Sep 2025168 PMAQI
30th Sep 2025219 PMAQI
30th Sep 20252010 PMAQI
30th Sep 20252211 PMAQI
1st Oct 20251512 AMAQI
1st Oct 2025111 AMAQI
1st Oct 2025112 AMAQI
1st Oct 2025113 AMAQI
1st Oct 2025114 AMAQI
1st Oct 2025115 AMAQI

16°C11/22°C

1st Oct 2025116 AMAQI
1st Oct 2025117 AMAQI
1st Oct 2025118 AMAQI
1st Oct 2025119 AMAQI
1st Oct 20251210 AMAQI
1st Oct 20251211 AMAQI
1st Oct 20253012 PMAQI
1st Oct 2025351 PMAQI
1st Oct 2025362 PMAQI
1st Oct 2025353 PMAQI
1st Oct 2025394 PMAQI
1st Oct 2025115 PMAQI
1st Oct 2025276 PMAQI
1st Oct 2025397 PMAQI
1st Oct 2025468 PMAQI
1st Oct 2025499 PMAQI
1st Oct 20254810 PMAQI
1st Oct 20254311 PMAQI
2nd Oct 20254212 AMAQI
2nd Oct 2025421 AMAQI
2nd Oct 2025422 AMAQI
2nd Oct 2025393 AMAQI
2nd Oct 2025364 AMAQI
2nd Oct 2025365 AMAQI

12°C6/20°C

2nd Oct 2025336 AMAQI
2nd Oct 2025367 AMAQI
2nd Oct 2025398 AMAQI
2nd Oct 2025419 AMAQI
2nd Oct 20254210 AMAQI
2nd Oct 20254811 AMAQI
2nd Oct 20254512 PMAQI
2nd Oct 2025431 PMAQI
2nd Oct 2025442 PMAQI
2nd Oct 2025423 PMAQI
2nd Oct 2025424 PMAQI
2nd Oct 2025425 PMAQI
2nd Oct 2025446 PMAQI
2nd Oct 2025467 PMAQI
2nd Oct 2025528 PMAQI
2nd Oct 2025529 PMAQI
2nd Oct 20255310 PMAQI
2nd Oct 20255011 PMAQI
3rd Oct 20253412 AMAQI
3rd Oct 2025381 AMAQI
3rd Oct 2025402 AMAQI
3rd Oct 2025463 AMAQI
3rd Oct 2025434 AMAQI
3rd Oct 2025425 AMAQI

11°C3/21°C

3rd Oct 2025386 AMAQI
6 AM
3rd Oct 2025317 AMAQI
3rd Oct 2025418 AMAQI
12 PM
7 PM
12 AM
5 AM

--°C/°C

Day time
Avg. Highest Time
12 PM

27AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
6 AM - 10 AM

25AQI

5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 PM to 12 PM (Avg. 27), while the lowest AQI was between 6 AM to 10 AM (Avg. 25).
Night time
Avg. Highest Time
9 PM - 11 PM

28AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
4 AM - 5 AM

26AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 11 PM (Avg. 28), while the lowest AQI was between 4 AM to 5 AM (Avg. 26).

2025 Days Vs Air Quality

Ottawa Downtown, Ottawa, Ontario, Canada

2025

91%

249

9%

26

Total number of days with different AQI categories in last 276 days in 2025 (89 days remaining)

Good
249 Days
Moderate
26 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



Under WHO’s Safe Air Quality Limits: 91%

Health Risk Level:

Very Low

In 2025, 91% of 276 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

Ottawa Downtown, Ottawa, 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.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
20AQI
2nd January 2025
22AQI
3rd January 2025
22AQI
4th January 2025
24AQI
5th January 2025
23AQI
6th January 2025
21AQI
7th January 2025
23AQI
8th January 2025
22AQI
9th January 2025
25AQI
10th January 2025
31AQI
11th January 2025
36AQI
12th January 2025
30AQI
13th January 2025
49AQI
14th January 2025
20AQI
15th January 2025
21AQI
16th January 2025
33AQI
17th January 2025
51AQI
18th January 2025
29AQI
19th January 2025
21AQI
20th January 2025
24AQI
21st January 2025
35AQI
22nd January 2025
40AQI
23rd January 2025
36AQI
24th January 2025
33AQI
25th January 2025
54AQI
26th January 2025
34AQI
27th January 2025
23AQI
28th January 2025
27AQI
29th January 2025
23AQI
30th January 2025
23AQI
31st January 2025
31AQI
1st February 2025
24AQI
2nd February 2025
43AQI
3rd February 2025
52AQI
4th February 2025
21AQI
5th February 2025
23AQI
6th February 2025
33AQI
7th February 2025
27AQI
8th February 2025
23AQI
9th February 2025
24AQI
10th February 2025
22AQI
11th February 2025
27AQI
12th February 2025
27AQI
13th February 2025
22AQI
14th February 2025
22AQI
15th February 2025
23AQI
16th February 2025
23AQI
17th February 2025
22AQI
18th February 2025
20AQI
19th February 2025
19AQI
20th February 2025
22AQI
21st February 2025
27AQI
22nd February 2025
29AQI
23rd February 2025
45AQI
24th February 2025
45AQI
25th February 2025
57AQI
26th February 2025
30AQI
27th February 2025
28AQI
28th February 2025
29AQI
1st March 2025
27AQI
2nd March 2025
25AQI
3rd March 2025
44AQI
4th March 2025
37AQI
5th March 2025
49AQI
6th March 2025
26AQI
7th March 2025
29AQI
8th March 2025
31AQI
9th March 2025
29AQI
10th March 2025
26AQI
11th March 2025
35AQI
12th March 2025
27AQI
13th March 2025
31AQI
14th March 2025
59AQI
15th March 2025
57AQI
16th March 2025
41AQI
17th March 2025
16AQI
18th March 2025
24AQI
19th March 2025
27AQI
20th March 2025
29AQI
21st March 2025
17AQI
22nd March 2025
20AQI
23rd March 2025
18AQI
24th March 2025
23AQI
25th March 2025
20AQI
26th March 2025
20AQI
27th March 2025
18AQI
28th March 2025
18AQI
29th March 2025
17AQI
30th March 2025
20AQI
31st March 2025
24AQI
1st April 2025
16AQI
2nd April 2025
18AQI
3rd April 2025
22AQI
4th April 2025
17AQI
5th April 2025
20AQI
6th April 2025
17AQI
7th April 2025
20AQI
8th April 2025
17AQI
9th April 2025
16AQI
10th April 2025
24AQI
11th April 2025
32AQI
12th April 2025
26AQI
13th April 2025
27AQI
14th April 2025
26AQI
15th April 2025
22AQI
16th April 2025
15AQI
17th April 2025
16AQI
18th April 2025
28AQI
19th April 2025
38AQI
20th April 2025
15AQI
21st April 2025
19AQI
22nd April 2025
16AQI
23rd April 2025
13AQI
24th April 2025
17AQI
25th April 2025
20AQI
26th April 2025
15AQI
27th April 2025
12AQI
28th April 2025
16AQI
29th April 2025
25AQI
30th April 2025
14AQI
1st May 2025
21AQI
2nd May 2025
22AQI
3rd May 2025
13AQI
4th May 2025
17AQI
5th May 2025
16AQI
6th May 2025
17AQI
7th May 2025
18AQI
8th May 2025
14AQI
9th May 2025
16AQI
10th May 2025
18AQI
11th May 2025
15AQI
12th May 2025
18AQI
13th May 2025
27AQI
14th May 2025
29AQI
15th May 2025
26AQI
16th May 2025
32AQI
17th May 2025
33AQI
18th May 2025
15AQI
19th May 2025
12AQI
20th May 2025
12AQI
21st May 2025
19AQI
22nd May 2025
14AQI
23rd May 2025
15AQI
24th May 2025
13AQI
25th May 2025
15AQI
26th May 2025
20AQI
27th May 2025
21AQI
28th May 2025
25AQI
29th May 2025
20AQI
30th May 2025
22AQI
31st May 2025
23AQI
1st June 2025
12AQI
2nd June 2025
16AQI
3rd June 2025
26AQI
4th June 2025
44AQI
5th June 2025
46AQI
6th June 2025
53AQI
7th June 2025
59AQI
8th June 2025
57AQI
9th June 2025
58AQI
10th June 2025
39AQI
11th June 2025
51AQI
12th June 2025
53AQI
13th June 2025
24AQI
14th June 2025
24AQI
15th June 2025
28AQI
16th June 2025
36AQI
17th June 2025
29AQI
18th June 2025
29AQI
19th June 2025
33AQI
20th June 2025
19AQI
21st June 2025
25AQI
22nd June 2025
26AQI
23rd June 2025
42AQI
24th June 2025
51AQI
25th June 2025
41AQI
26th June 2025
25AQI
27th June 2025
25AQI
28th June 2025
28AQI
29th June 2025
20AQI
30th June 2025
29AQI
1st July 2025
34AQI
2nd July 2025
33AQI
3rd July 2025
42AQI
4th July 2025
24AQI
5th July 2025
28AQI
6th July 2025
47AQI
7th July 2025
45AQI
8th July 2025
26AQI
9th July 2025
26AQI
10th July 2025
33AQI
11th July 2025
37AQI
12th July 2025
48AQI
13th July 2025
43AQI
14th July 2025
46AQI
15th July 2025
46AQI
16th July 2025
55AQI
17th July 2025
53AQI
18th July 2025
22AQI
19th July 2025
30AQI
20th July 2025
30AQI
21st July 2025
28AQI
22nd July 2025
18AQI
23rd July 2025
23AQI
24th July 2025
27AQI
25th July 2025
31AQI
26th July 2025
51AQI
27th July 2025
58AQI
28th July 2025
60AQI
29th July 2025
48AQI
30th July 2025
62AQI
31st July 2025
50AQI
1st August 2025
20AQI
2nd August 2025
37AQI
3rd August 2025
61AQI
4th August 2025
71AQI
5th August 2025
32AQI
6th August 2025
28AQI
7th August 2025
39AQI
8th August 2025
56AQI
9th August 2025
61AQI
10th August 2025
64AQI
11th August 2025
56AQI
12th August 2025
53AQI
13th August 2025
46AQI
14th August 2025
39AQI
15th August 2025
22AQI
16th August 2025
36AQI
17th August 2025
25AQI
18th August 2025
15AQI
19th August 2025
18AQI
20th August 2025
21AQI
21st August 2025
21AQI
22nd August 2025
26AQI
23rd August 2025
27AQI
24th August 2025
26AQI
25th August 2025
19AQI
26th August 2025
14AQI
27th August 2025
19AQI
28th August 2025
23AQI
29th August 2025
17AQI
30th August 2025
17AQI
31st August 2025
22AQI
1st September 2025
27AQI
2nd September 2025
33AQI
3rd September 2025
30AQI
4th September 2025
26AQI
5th September 2025
30AQI
6th September 2025
22AQI
7th September 2025
18AQI
8th September 2025
20AQI
9th September 2025
20AQI
10th September 2025
26AQI
11th September 2025
28AQI
12th September 2025
22AQI
13th September 2025
32AQI
14th September 2025
36AQI
15th September 2025
24AQI
16th September 2025
28AQI
17th September 2025
32AQI
18th September 2025
30AQI
19th September 2025
16AQI
20th September 2025
16AQI
21st September 2025
22AQI
22nd September 2025
24AQI
23rd September 2025
33AQI
24th September 2025
32AQI
25th September 2025
19AQI
26th September 2025
22AQI
27th September 2025
25AQI
28th September 2025
25AQI
29th September 2025
35AQI
30th September 2025
27AQI
1st October 2025
22AQI
2nd October 2025
42AQI
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025

29AQI

29AQI

29AQI

20AQI

19AQI

35AQI

39AQI

33AQI

26AQI

32AQI


No. of days

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

202529AQI

29
2
26
2
29
2
30
31
23
7
25
6
24
7
30
2
249
26

Highest AQI recorded in

July

39AQI


Lowest AQI recorded in

May

19AQI


202430AQI

30
1
22
7
30
1
30
31
27
2
28
3
21
10
28
2
31
30
29
2
337
28

Highest AQI recorded in

February

37AQI


Lowest AQI recorded in

November

23AQI


202338AQI

30
1
22
6
30
1
30
30
1
14
9
2
3
2
19
11
1
25
6
23
7
29
2
27
2
25
6
304
52
3
3
2

Highest AQI recorded in

June

78AQI


Lowest AQI recorded in

January

27AQI


202230AQI

23
8
20
2
31
17
31
30
22
1
29
30
1
29
1
30
1
293
13

Highest AQI recorded in

January

39AQI


Lowest AQI recorded in

August

16AQI


202130AQI

24
6
25
3
27
4
30
27
30
26
5
26
5
30
31
29
1
28
3
333
27

Highest AQI recorded in

August

35AQI


Lowest AQI recorded in

September

20AQI


202028AQI

13
21
18
30
31
31
30
31
24
6
28
3
257
9

Highest AQI recorded in

November

36AQI


Lowest AQI recorded in

August

21AQI


Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2023(Avg.)
38AQI
Least Polluted Year Recorded
2020(Avg.)
28AQI


Ottawa Downtown's annual 2025 AQI (29) shows an average percentage change of -6.1% (improved AQI) compared to previous years: 2020 (28), 2021 (30), 2022 (30), 2023 (38), 2024 (30).