Kitchener, 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
Kitchener, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (18th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 44 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Kitchener, Ontario, Canada
6 AM18th Sep 2025
7 PM
5 AM19th Sep 2025
46AQI
37AQI
52AQI
20AQI
In the last 24 hours,
Kitchener's AQI reached its highest point of 52 at 6 AM during the Night, while the lowest point, 20, was recorded at 5 AM during the Night between 18th Sep and 19th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Kitchener, Ontario, Canada
20°C17/24°C
20°C16/24°C
21°C12/30°C
20°C15/26°C
19°C15/22°C
17°C13/21°C
15°C11/19°C
15°C8/20°C
15°C12/22°C
13°C7/18°C
13°C6/20°C
16°C6/25°C
18°C10/26°C
19°C12/27°C
19°C9/29°C
15°C12/17°C
16°C9/24°C
14°C8/21°C
13°C8/19°C
13°C4/19°C
15°C7/23°C
18°C10/27°C
19°C10/26°C
19°C10/26°C
19°C12/25°C
20°C12/28°C
19°C11/27°C
18°C11/26°C
20°C11/29°C
20°C12/28°C
--°C/°C
32AQI
27AQI
31AQI
27AQI
2025 Days Vs Air Quality
Kitchener, Ontario, Canada
82%
144
16%
29
2%
3
Total number of days with different AQI categories in last 262 days in 2025 (103 days remaining)
Under WHO’s Safe Air Quality Limits: 82%
Health Risk Level:
Low
In 2025, 82% of 262 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
Kitchener, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
28AQI
37AQI
23AQI
21AQI
17AQI
17AQI
23AQI
18AQI
19AQI
17AQI
19AQI
14AQI
18AQI
32AQI
29AQI
24AQI
37AQI
28AQI
17AQI
13AQI
19AQI
37AQI
40AQI
17AQI
22AQI
14AQI
34AQI
39AQI
35AQI
27AQI
15AQI
23AQI
33AQI
17AQI
33AQI
30AQI
18AQI
17AQI
19AQI
21AQI
36AQI
20AQI
21AQI
28AQI
25AQI
30AQI
37AQI
22AQI
31AQI
30AQI
28AQI
18AQI
15AQI
16AQI
17AQI
12AQI
11AQI
12AQI
17AQI
22AQI
28AQI
24AQI
29AQI
36AQI
28AQI
19AQI
24AQI
41AQI
73AQI
54AQI
64AQI
65AQI
82AQI
67AQI
56AQI
62AQI
67AQI
46AQI
35AQI
37AQI
38AQI
42AQI
40AQI
28AQI
38AQI
47AQI
49AQI
52AQI
55AQI
45AQI
40AQI
37AQI
32AQI
36AQI
40AQI
37AQI
40AQI
45AQI
41AQI
44AQI
51AQI
47AQI
34AQI
43AQI
38AQI
47AQI
44AQI
45AQI
47AQI
59AQI
67AQI
47AQI
25AQI
34AQI
25AQI
45AQI
25AQI
25AQI
35AQI
33AQI
53AQI
43AQI
50AQI
44AQI
50AQI
91AQI
59AQI
42AQI
102AQI
125AQI
102AQI
84AQI
85AQI
82AQI
63AQI
63AQI
61AQI
53AQI
43AQI
58AQI
69AQI
62AQI
40AQI
15AQI
21AQI
21AQI
18AQI
23AQI
30AQI
28AQI
16AQI
17AQI
20AQI
25AQI
20AQI
20AQI
34AQI
31AQI
30AQI
31AQI
25AQI
35AQI
19AQI
18AQI
19AQI
22AQI
34AQI
34AQI
37AQI
54AQI
54AQI
47AQI
40AQI
40AQI
44AQI
27AQI
24AQI
24AQI
47AQI
44AQI
48AQI
34AQI
No. of days
202537AQI
Highest AQI recorded in
August48AQI
Lowest AQI recorded in
May24AQI
Most & Least Polluted Years Over the Last 1 Years
Kitchener's annual 2025 AQI (37) shows an average percentage change of NaN% (improved AQI) compared to previous years: .