Ottawa, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Ottawa, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (31st July ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 27 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
2025 Days Vs Air Quality
Ottawa, Ontario, Canada
93%
169
7%
12
Total number of days with different AQI categories in last 182 days in 2025 (183 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% of 182 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 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
21AQI
21AQI
23AQI
22AQI
23AQI
21AQI
21AQI
24AQI
28AQI
37AQI
30AQI
51AQI
22AQI
22AQI
35AQI
50AQI
29AQI
21AQI
24AQI
38AQI
42AQI
37AQI
34AQI
54AQI
35AQI
26AQI
26AQI
23AQI
23AQI
35AQI
24AQI
41AQI
53AQI
22AQI
23AQI
34AQI
28AQI
23AQI
24AQI
22AQI
28AQI
28AQI
22AQI
21AQI
23AQI
21AQI
21AQI
20AQI
19AQI
22AQI
28AQI
34AQI
47AQI
47AQI
56AQI
30AQI
32AQI
28AQI
26AQI
24AQI
44AQI
38AQI
48AQI
26AQI
28AQI
30AQI
28AQI
25AQI
35AQI
26AQI
34AQI
60AQI
57AQI
43AQI
16AQI
23AQI
27AQI
30AQI
17AQI
20AQI
17AQI
23AQI
20AQI
20AQI
18AQI
18AQI
17AQI
20AQI
24AQI
16AQI
19AQI
22AQI
18AQI
20AQI
18AQI
20AQI
18AQI
16AQI
25AQI
31AQI
26AQI
27AQI
27AQI
22AQI
15AQI
16AQI
29AQI
38AQI
15AQI
19AQI
16AQI
13AQI
19AQI
20AQI
16AQI
12AQI
17AQI
25AQI
14AQI
21AQI
21AQI
13AQI
17AQI
16AQI
17AQI
18AQI
14AQI
16AQI
18AQI
15AQI
19AQI
27AQI
29AQI
26AQI
31AQI
32AQI
15AQI
12AQI
12AQI
19AQI
14AQI
15AQI
12AQI
15AQI
21AQI
22AQI
26AQI
21AQI
22AQI
23AQI
12AQI
16AQI
26AQI
44AQI
46AQI
53AQI
60AQI
57AQI
57AQI
39AQI
51AQI
53AQI
25AQI
24AQI
27AQI
35AQI
29AQI
29AQI
32AQI
19AQI
25AQI
26AQI
40AQI
50AQI
39AQI
25AQI
24AQI
27AQI
21AQI
28AQI
30AQI
29AQI
28AQI
20AQI
19AQI
35AQI
No. of days
202527AQI
Highest AQI recorded in
June35AQI
Lowest AQI recorded in
May19AQI
202429AQI
Highest AQI recorded in
February36AQI
Lowest AQI recorded in
November23AQI
202337AQI
Highest AQI recorded in
June74AQI
Lowest AQI recorded in
November28AQI
202230AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
August21AQI
202130AQI
Highest AQI recorded in
August37AQI
Lowest AQI recorded in
September20AQI
202026AQI
Highest AQI recorded in
November36AQI
Lowest AQI recorded in
August20AQI
Most & Least Polluted Years Over the Last 6 Years
Ottawa's annual 2025 AQI (27) shows an average percentage change of -10.3% (improved AQI) compared to previous years: 2020 (26), 2021 (30), 2022 (30), 2023 (37), 2024 (29).
