Ottawa, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Ottawa, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (30th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 26 of Good air quality, showing improvement over 2025 and 2023 on the same day.
Day & Night AQI Trend: 29th Sep - 30th Sep 2026
Ottawa, Ontario, Canada
6 AM29th Sep 2026
7 PM
5 AM30th Sep 2026
50AQI
25AQI
46AQI
22AQI
In the last 24 hours,
Ottawa's AQI reached its highest point of 50 at 12 PM during the Day, while the lowest point, 22, was recorded at 8 PM during the Night between 29th Sep and 30th Sep 2026.
Day & Night AQI Trend : Sep 2026
Ottawa, Ontario, Canada
20°C16/26°C
20°C15/26°C
21°C19/27°C
19°C16/23°C
18°C14/23°C
18°C13/25°C
18°C13/26°C
18°C16/22°C
18°C15/21°C
19°C13/24°C
14°C8/21°C
15°C9/26°C
20°C16/24°C
13°C9/18°C
12°C7/16°C
18°C14/24°C
16°C11/22°C
13°C8/18°C
10°C5/16°C
12°C7/19°C
10°C5/14°C
10°C6/17°C
11°C6/18°C
12°C6/19°C
14°C8/21°C
15°C10/22°C
16°C11/21°C
14°C12/15°C
14°C10/20°C
15°C10/19°C
31AQI
25AQI
36AQI
28AQI
2026 Days Vs Air Quality
Ottawa, Ontario, Canada
95%
257
5%
13
Total number of days with different AQI categories in last 273 days in 2026 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2026, 95% of 273 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, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
45AQI (US)
18AQI (US)
28AQI (US)
39AQI (US)
54AQI (US)
56AQI (US)
45AQI (US)
46AQI (US)
14AQI (US)
17AQI (US)
20AQI (US)
50AQI (US)
42AQI (US)
16AQI (US)
15AQI (US)
33AQI (US)
33AQI (US)
43AQI (US)
19AQI (US)
25AQI (US)
49AQI (US)
53AQI (US)
48AQI (US)
47AQI (US)
47AQI (US)
44AQI (US)
48AQI (US)
52AQI (US)
51AQI (US)
45AQI (US)
47AQI (US)
50AQI (US)
48AQI (US)
49AQI (US)
48AQI (US)
40AQI (US)
38AQI (US)
46AQI (US)
47AQI (US)
44AQI (US)
41AQI (US)
40AQI (US)
48AQI (US)
48AQI (US)
38AQI (US)
43AQI (US)
44AQI (US)
42AQI (US)
40AQI (US)
39AQI (US)
35AQI (US)
36AQI (US)
40AQI (US)
46AQI (US)
42AQI (US)
36AQI (US)
36AQI (US)
39AQI (US)
39AQI (US)
55AQI (US)
47AQI (US)
45AQI (US)
41AQI (US)
38AQI (US)
40AQI (US)
40AQI (US)
41AQI (US)
34AQI (US)
44AQI (US)
42AQI (US)
40AQI (US)
37AQI (US)
35AQI (US)
36AQI (US)
33AQI (US)
31AQI (US)
32AQI (US)
36AQI (US)
37AQI (US)
36AQI (US)
41AQI (US)
36AQI (US)
32AQI (US)
27AQI (US)
28AQI (US)
32AQI (US)
30AQI (US)
26AQI (US)
25AQI (US)
30AQI (US)
31AQI (US)
27AQI (US)
32AQI (US)
29AQI (US)
28AQI (US)
26AQI (US)
31AQI (US)
28AQI (US)
30AQI (US)
32AQI (US)
26AQI (US)
33AQI (US)
32AQI (US)
32AQI (US)
30AQI (US)
29AQI (US)
33AQI (US)
29AQI (US)
27AQI (US)
23AQI (US)
25AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
24AQI (US)
23AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
20AQI (US)
31AQI (US)
33AQI (US)
30AQI (US)
28AQI (US)
28AQI (US)
33AQI (US)
29AQI (US)
25AQI (US)
28AQI (US)
23AQI (US)
46AQI (US)
53AQI (US)
56AQI (US)
58AQI (US)
55AQI (US)
50AQI (US)
44AQI (US)
44AQI (US)
50AQI (US)
48AQI (US)
45AQI (US)
28AQI (US)
26AQI (US)
19AQI (US)
19AQI (US)
20AQI (US)
27AQI (US)
28AQI (US)
25AQI (US)
23AQI (US)
25AQI (US)
28AQI (US)
25AQI (US)
21AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
26AQI (US)
27AQI (US)
23AQI (US)
23AQI (US)
24AQI (US)
26AQI (US)
27AQI (US)
26AQI (US)
24AQI (US)
24AQI (US)
21AQI (US)
24AQI (US)
24AQI (US)
23AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
27AQI (US)
25AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
28AQI (US)
25AQI (US)
27AQI (US)
28AQI (US)
30AQI (US)
27AQI (US)
29AQI (US)
39AQI (US)
52AQI (US)
69AQI (US)
52AQI (US)
44AQI (US)
50AQI (US)
50AQI (US)
36AQI (US)
47AQI (US)
38AQI (US)
32AQI (US)
44AQI (US)
25AQI (US)
30AQI (US)
27AQI (US)
26AQI (US)
33AQI (US)
44AQI (US)
39AQI (US)
34AQI (US)
31AQI (US)
30AQI (US)
24AQI (US)
29AQI (US)
26AQI (US)
36AQI (US)
31AQI (US)
31AQI (US)
30AQI (US)
34AQI (US)
25AQI (US)
31AQI (US)
29AQI (US)
34AQI (US)
34AQI (US)
28AQI (US)
31AQI (US)
31AQI (US)
24AQI (US)
25AQI (US)
29AQI (US)
26AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
25AQI (US)
29AQI (US)
24AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
25AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
26AQI (US)
30AQI (US)
28AQI (US)
25AQI (US)
35AQI (US)
41AQI (US)
40AQI (US)
28AQI (US)
34AQI (US)
28AQI (US)
29AQI (US)
28AQI (US)
33AQI (US)
28AQI (US)
29AQI (US)
28AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
34AQI (US)
34AQI (US)
32AQI (US)
29AQI (US)
38AQI (US)
26AQI (US)
37AQI (US)
43AQI (US)
37AQI (US)
29AQI (US)
35AQI (US)
25AQI (US)
36AQI (US)
28AQI (US)
30AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
February43AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202530AQI (US)
Highest AQI (US) recorded in
July39AQI (US)
Lowest AQI (US) recorded in
May19AQI (US)
202429AQI (US)
Highest AQI (US) recorded in
February36AQI (US)
Lowest AQI (US) recorded in
November23AQI (US)
202337AQI (US)
Highest AQI (US) recorded in
June74AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202230AQI (US)
Highest AQI (US) recorded in
January40AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202130AQI (US)
Highest AQI (US) recorded in
August37AQI (US)
Lowest AQI (US) recorded in
September20AQI (US)
202026AQI (US)
Highest AQI (US) recorded in
November36AQI (US)
Lowest AQI (US) recorded in
October21AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Ottawa's annual 2026 AQI (US) (33) shows an average percentage change of 9.9% (worsened AQI (US)) compared to previous years: 2020 (26), 2021 (30), 2022 (30), 2023 (37), 2024 (29), 2025 (30).