Toronto, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Toronto, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (18th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 16 of Good air quality, showing improvement over 2024, 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 19th Aug - 20th Aug 2025
Toronto, Ontario, Canada
6 AM19th Aug 2025
8 PM
5 AM20th Aug 2025
29AQI
17AQI
28AQI
20AQI
In the last 24 hours,
Toronto's AQI reached its highest point of 29 at 7 PM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 19th Aug and 20th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Toronto, Ontario, Canada
20°C16/25°C
20°C14/26°C
24°C18/31°C
28°C20/37°C
26°C23/30°C
25°C19/30°C
28°C23/33°C
28°C20/34°C
28°C22/35°C
26°C21/33°C
22°C19/26°C
22°C18/26°C
23°C15/30°C
25°C17/31°C
25°C18/32°C
24°C20/28°C
25°C20/29°C
25°C21/30°C
25°C21/30°C
27°C22/33°C
28°C23/34°C
29°C23/35°C
29°C24/33°C
27°C22/31°C
24°C18/31°C
26°C21/31°C
27°C21/34°C
23°C20/25°C
19°C15/23°C
21°C19/25°C
--°C/°C
56AQI
56AQI
57AQI
57AQI
2025 Days Vs Air Quality
Toronto, Ontario, Canada
82%
188
18%
41
0.4%
1
Total number of days with different AQI categories in last 232 days in 2025 (133 days remaining)
Under WHO’s Safe Air Quality Limits: 82%
Health Risk Level:
Low
In 2025, 82% of 232 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
Toronto, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
20AQI
22AQI
26AQI
24AQI
20AQI
20AQI
21AQI
23AQI
41AQI
65AQI
51AQI
40AQI
25AQI
26AQI
56AQI
43AQI
27AQI
23AQI
23AQI
28AQI
33AQI
46AQI
36AQI
52AQI
32AQI
26AQI
25AQI
27AQI
27AQI
63AQI
25AQI
28AQI
57AQI
22AQI
25AQI
38AQI
26AQI
39AQI
30AQI
28AQI
45AQI
26AQI
26AQI
26AQI
33AQI
26AQI
25AQI
24AQI
22AQI
21AQI
25AQI
48AQI
61AQI
61AQI
66AQI
30AQI
37AQI
25AQI
28AQI
28AQI
33AQI
43AQI
43AQI
24AQI
30AQI
32AQI
29AQI
37AQI
37AQI
25AQI
31AQI
60AQI
58AQI
34AQI
19AQI
30AQI
36AQI
28AQI
22AQI
20AQI
24AQI
25AQI
19AQI
21AQI
28AQI
21AQI
20AQI
27AQI
29AQI
18AQI
18AQI
32AQI
22AQI
26AQI
18AQI
22AQI
16AQI
23AQI
36AQI
31AQI
32AQI
36AQI
31AQI
21AQI
15AQI
22AQI
37AQI
44AQI
18AQI
21AQI
18AQI
20AQI
38AQI
37AQI
31AQI
15AQI
29AQI
36AQI
20AQI
27AQI
31AQI
17AQI
18AQI
20AQI
21AQI
29AQI
18AQI
22AQI
26AQI
24AQI
28AQI
36AQI
24AQI
27AQI
33AQI
34AQI
21AQI
15AQI
16AQI
17AQI
14AQI
16AQI
16AQI
17AQI
23AQI
32AQI
25AQI
28AQI
33AQI
27AQI
18AQI
22AQI
41AQI
58AQI
49AQI
61AQI
63AQI
76AQI
66AQI
51AQI
59AQI
65AQI
41AQI
32AQI
39AQI
40AQI
39AQI
42AQI
38AQI
36AQI
49AQI
53AQI
55AQI
56AQI
46AQI
42AQI
39AQI
35AQI
36AQI
41AQI
42AQI
40AQI
50AQI
35AQI
48AQI
53AQI
49AQI
35AQI
41AQI
44AQI
52AQI
49AQI
46AQI
48AQI
56AQI
59AQI
45AQI
25AQI
31AQI
29AQI
42AQI
23AQI
22AQI
35AQI
36AQI
52AQI
48AQI
51AQI
47AQI
50AQI
83AQI
49AQI
38AQI
96AQI
114AQI
99AQI
79AQI
86AQI
88AQI
77AQI
66AQI
63AQI
58AQI
47AQI
61AQI
62AQI
60AQI
41AQI
16AQI
33AQI
34AQI
30AQI
26AQI
24AQI
46AQI
44AQI
67AQI
No. of days
202536AQI
Highest AQI recorded in
August67AQI
Lowest AQI recorded in
May24AQI
202432AQI
Highest AQI recorded in
July38AQI
Lowest AQI recorded in
November24AQI
202339AQI
Highest AQI recorded in
June65AQI
Lowest AQI recorded in
October30AQI
202233AQI
Highest AQI recorded in
November37AQI
Lowest AQI recorded in
August20AQI
202134AQI
Highest AQI recorded in
July42AQI
Lowest AQI recorded in
September26AQI
202032AQI
Highest AQI recorded in
November36AQI
Lowest AQI recorded in
October26AQI
Most & Least Polluted Years Over the Last 6 Years
Toronto's annual 2025 AQI (36) shows an average percentage change of 7.3% (worsened AQI) compared to previous years: 2020 (32), 2021 (34), 2022 (33), 2023 (39), 2024 (32).