Sarnia, 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
Sarnia, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (22nd September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 39 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Sep - 23rd Sep 2025
Sarnia, Ontario, Canada
7 AM22nd Sep 2025
7 PM
6 AM23rd Sep 2025
49AQI
38AQI
43AQI
38AQI
In the last 24 hours,
Sarnia's AQI reached its highest point of 49 at 12 PM during the Day, while the lowest point, 38, was recorded at 6 AM during the Night between 22nd Sep and 23rd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Sarnia, Ontario, Canada
19°C13/25°C
16°C11/21°C
16°C8/20°C
17°C7/25°C
16°C12/19°C
15°C12/18°C
15°C8/23°C
16°C8/24°C
17°C13/22°C
18°C11/25°C
19°C11/28°C
16°C13/21°C
16°C8/24°C
14°C8/19°C
14°C5/21°C
15°C9/19°C
15°C7/25°C
16°C9/24°C
17°C12/24°C
18°C13/25°C
17°C12/21°C
19°C12/27°C
19°C15/28°C
18°C13/25°C
17°C12/23°C
19°C13/28°C
17°C16/18°C
17°C11/25°C
20°C12/31°C
21°C18/26°C
--°C/°C
35AQI
30AQI
34AQI
29AQI
2025 Days Vs Air Quality
Sarnia, Ontario, Canada
79%
142
19%
35
2%
3
Total number of days with different AQI categories in last 266 days in 2025 (99 days remaining)
Under WHO’s Safe Air Quality Limits: 79%
Health Risk Level:
Low
In 2025, 79% of 266 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
Sarnia, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
39AQI
37AQI
45AQI
41AQI
22AQI
18AQI
19AQI
23AQI
18AQI
20AQI
20AQI
20AQI
14AQI
28AQI
33AQI
32AQI
21AQI
40AQI
27AQI
14AQI
14AQI
25AQI
41AQI
41AQI
18AQI
23AQI
14AQI
39AQI
50AQI
44AQI
20AQI
20AQI
28AQI
37AQI
15AQI
26AQI
24AQI
16AQI
18AQI
22AQI
31AQI
26AQI
18AQI
19AQI
32AQI
24AQI
35AQI
28AQI
19AQI
26AQI
33AQI
25AQI
17AQI
13AQI
17AQI
20AQI
13AQI
11AQI
12AQI
28AQI
26AQI
28AQI
21AQI
29AQI
37AQI
28AQI
23AQI
30AQI
46AQI
71AQI
72AQI
84AQI
70AQI
95AQI
81AQI
57AQI
70AQI
78AQI
47AQI
38AQI
36AQI
38AQI
42AQI
34AQI
23AQI
37AQI
43AQI
43AQI
54AQI
55AQI
43AQI
51AQI
47AQI
29AQI
38AQI
36AQI
30AQI
42AQI
52AQI
48AQI
55AQI
57AQI
37AQI
43AQI
56AQI
47AQI
49AQI
40AQI
42AQI
69AQI
86AQI
86AQI
44AQI
30AQI
34AQI
31AQI
43AQI
24AQI
26AQI
45AQI
37AQI
55AQI
38AQI
45AQI
41AQI
49AQI
106AQI
74AQI
40AQI
98AQI
133AQI
107AQI
92AQI
80AQI
70AQI
57AQI
62AQI
59AQI
48AQI
34AQI
65AQI
79AQI
68AQI
41AQI
16AQI
22AQI
19AQI
18AQI
21AQI
31AQI
26AQI
16AQI
19AQI
23AQI
29AQI
19AQI
20AQI
35AQI
32AQI
29AQI
33AQI
25AQI
36AQI
19AQI
20AQI
21AQI
22AQI
35AQI
43AQI
37AQI
53AQI
65AQI
52AQI
44AQI
40AQI
52AQI
37AQI
22AQI
25AQI
39AQI
37AQI
26AQI
23AQI
50AQI
48AQI
49AQI
36AQI
No. of days
202539AQI
Highest AQI recorded in
June50AQI
Lowest AQI recorded in
May23AQI
Most & Least Polluted Years Over the Last 1 Years
Sarnia's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .