Toronto Downtown, 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 Downtown, Toronto, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (30th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 22 of Good air quality, showing improvement over 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Aug - 31st Aug 2025
Toronto Downtown, Toronto, Ontario, Canada
6 AM30th Aug 2025
8 PM
5 AM31st Aug 2025
23AQI
16AQI
26AQI
18AQI
In the last 24 hours,
Toronto Downtown's AQI reached its highest point of 26 at 12 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 30th Aug and 31st Aug 2025.
Day & Night AQI Trend : Aug 2025
Toronto Downtown, Toronto, Ontario, Canada
22°C18/27°C
23°C16/29°C
25°C19/31°C
25°C19/31°C
24°C21/28°C
24°C21/28°C
25°C21/30°C
25°C21/31°C
26°C22/31°C
28°C23/34°C
28°C23/33°C
28°C24/33°C
27°C22/31°C
25°C19/31°C
26°C22/30°C
27°C22/33°C
24°C20/26°C
20°C15/24°C
21°C19/24°C
20°C18/22°C
21°C17/26°C
23°C17/29°C
23°C19/27°C
22°C19/24°C
19°C15/21°C
17°C13/21°C
18°C13/23°C
18°C15/22°C
16°C12/20°C
17°C11/22°C
--°C/°C
50AQI
47AQI
49AQI
49AQI
2025 Days Vs Air Quality
Toronto Downtown, Toronto, Ontario, Canada
84%
203
16%
38
0.4%
1
Total number of days with different AQI categories in last 243 days in 2025 (122 days remaining)
Under WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 243 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 Downtown, Toronto, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI
20AQI
22AQI
25AQI
24AQI
20AQI
19AQI
21AQI
23AQI
42AQI
66AQI
50AQI
39AQI
24AQI
28AQI
57AQI
43AQI
27AQI
23AQI
23AQI
28AQI
33AQI
44AQI
38AQI
51AQI
33AQI
27AQI
26AQI
27AQI
29AQI
66AQI
24AQI
27AQI
61AQI
22AQI
25AQI
40AQI
27AQI
41AQI
30AQI
30AQI
44AQI
26AQI
26AQI
28AQI
37AQI
25AQI
24AQI
25AQI
24AQI
22AQI
27AQI
46AQI
61AQI
60AQI
64AQI
31AQI
37AQI
25AQI
27AQI
33AQI
33AQI
45AQI
47AQI
24AQI
29AQI
32AQI
29AQI
42AQI
37AQI
25AQI
34AQI
63AQI
58AQI
34AQI
23AQI
33AQI
41AQI
29AQI
27AQI
22AQI
26AQI
29AQI
19AQI
24AQI
29AQI
22AQI
18AQI
31AQI
31AQI
18AQI
18AQI
33AQI
26AQI
28AQI
19AQI
21AQI
15AQI
24AQI
40AQI
32AQI
39AQI
36AQI
35AQI
23AQI
18AQI
26AQI
41AQI
46AQI
17AQI
21AQI
19AQI
23AQI
41AQI
38AQI
34AQI
15AQI
32AQI
36AQI
16AQI
23AQI
30AQI
17AQI
19AQI
24AQI
23AQI
34AQI
17AQI
21AQI
28AQI
28AQI
28AQI
39AQI
25AQI
31AQI
31AQI
31AQI
21AQI
17AQI
17AQI
17AQI
17AQI
20AQI
18AQI
20AQI
26AQI
35AQI
26AQI
28AQI
34AQI
27AQI
24AQI
23AQI
43AQI
57AQI
48AQI
61AQI
61AQI
76AQI
66AQI
50AQI
57AQI
64AQI
44AQI
38AQI
41AQI
42AQI
42AQI
46AQI
42AQI
34AQI
47AQI
52AQI
55AQI
56AQI
47AQI
42AQI
42AQI
35AQI
37AQI
39AQI
42AQI
38AQI
47AQI
40AQI
49AQI
54AQI
47AQI
35AQI
37AQI
44AQI
51AQI
49AQI
46AQI
49AQI
55AQI
54AQI
42AQI
26AQI
31AQI
29AQI
39AQI
27AQI
23AQI
32AQI
33AQI
50AQI
48AQI
47AQI
43AQI
45AQI
77AQI
53AQI
37AQI
90AQI
110AQI
97AQI
77AQI
82AQI
85AQI
75AQI
65AQI
63AQI
58AQI
45AQI
61AQI
63AQI
59AQI
42AQI
17AQI
23AQI
21AQI
19AQI
26AQI
34AQI
34AQI
23AQI
20AQI
20AQI
27AQI
20AQI
22AQI
33AQI
34AQI
32AQI
28AQI
25AQI
47AQI
43AQI
49AQI
No. of days
202536AQI
Highest AQI recorded in
August49AQI
Lowest AQI recorded in
May25AQI
202432AQI
Highest AQI recorded in
July40AQI
Lowest AQI recorded in
November24AQI
202337AQI
Highest AQI recorded in
June58AQI
Lowest AQI recorded in
November29AQI
202235AQI
Highest AQI recorded in
November40AQI
Lowest AQI recorded in
August18AQI
202136AQI
Highest AQI recorded in
July50AQI
Lowest AQI recorded in
October26AQI
202032AQI
Highest AQI recorded in
June38AQI
Lowest AQI recorded in
October27AQI
Most & Least Polluted Years Over the Last 6 Years
Toronto Downtown's annual 2025 AQI (36) shows an average percentage change of 5.6% (worsened AQI) compared to previous years: 2020 (32), 2021 (36), 2022 (35), 2023 (37), 2024 (32).