Sarnia, Port Huron, Michigan, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Sarnia, Port Huron, Michigan, United States
AQI Trends: Highest and Lowest
Same Day Analysis (10th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 40 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 10th Oct - 11th Oct 2025
Sarnia, Port Huron, Michigan, United States
7 AM10th Oct 2025
7 PM
6 AM11th Oct 2025
75AQI
17AQI
52AQI
40AQI
In the last 24 hours,
Sarnia's AQI reached its highest point of 75 at 11 AM during the Day, while the lowest point, 17, was recorded at 7 AM during the Day between 10th Oct and 11th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Sarnia, Port Huron, Michigan, United States
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
21°C16/27°C
20°C16/25°C
18°C15/21°C
19°C13/29°C
21°C13/30°C
19°C14/25°C
17°C8/29°C
17°C9/26°C
16°C9/24°C
16°C7/28°C
18°C8/30°C
22°C13/33°C
23°C15/32°C
23°C16/31°C
17°C13/19°C
12°C9/15°C
10°C3/18°C
12°C4/21°C
--°C/°C
41AQI
37AQI
42AQI
38AQI
2025 Days Vs Air Quality
Sarnia, Port Huron, Michigan, United States
82%
231
17%
49
1%
3
Total number of days with different AQI categories in last 284 days in 2025 (81 days remaining)
Under WHO’s Safe Air Quality Limits: 82%
Health Risk Level:
Low
In 2025, 82% of 284 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, Port Huron, Michigan, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI
24AQI
23AQI
26AQI
24AQI
24AQI
25AQI
26AQI
29AQI
59AQI
58AQI
52AQI
30AQI
25AQI
27AQI
53AQI
37AQI
30AQI
27AQI
24AQI
25AQI
29AQI
42AQI
34AQI
52AQI
27AQI
26AQI
28AQI
27AQI
29AQI
49AQI
27AQI
36AQI
53AQI
25AQI
24AQI
33AQI
28AQI
42AQI
34AQI
37AQI
43AQI
31AQI
29AQI
42AQI
52AQI
38AQI
27AQI
26AQI
26AQI
23AQI
29AQI
53AQI
60AQI
56AQI
44AQI
36AQI
52AQI
24AQI
30AQI
29AQI
35AQI
37AQI
29AQI
29AQI
30AQI
31AQI
29AQI
35AQI
31AQI
29AQI
31AQI
50AQI
43AQI
22AQI
17AQI
25AQI
33AQI
22AQI
21AQI
18AQI
17AQI
20AQI
18AQI
19AQI
36AQI
39AQI
37AQI
39AQI
20AQI
17AQI
19AQI
20AQI
18AQI
19AQI
18AQI
19AQI
15AQI
28AQI
29AQI
28AQI
21AQI
36AQI
24AQI
14AQI
16AQI
25AQI
42AQI
36AQI
16AQI
22AQI
16AQI
38AQI
48AQI
37AQI
18AQI
20AQI
24AQI
34AQI
15AQI
25AQI
22AQI
16AQI
17AQI
22AQI
28AQI
24AQI
17AQI
19AQI
30AQI
21AQI
34AQI
24AQI
19AQI
26AQI
30AQI
22AQI
16AQI
13AQI
16AQI
20AQI
12AQI
11AQI
13AQI
26AQI
25AQI
27AQI
18AQI
30AQI
36AQI
24AQI
23AQI
29AQI
48AQI
70AQI
75AQI
85AQI
72AQI
95AQI
81AQI
54AQI
71AQI
77AQI
40AQI
35AQI
33AQI
34AQI
38AQI
33AQI
21AQI
36AQI
37AQI
40AQI
52AQI
53AQI
38AQI
49AQI
41AQI
29AQI
42AQI
33AQI
31AQI
40AQI
50AQI
44AQI
53AQI
54AQI
30AQI
40AQI
56AQI
42AQI
49AQI
39AQI
42AQI
73AQI
96AQI
87AQI
40AQI
31AQI
34AQI
29AQI
48AQI
21AQI
26AQI
44AQI
32AQI
58AQI
32AQI
45AQI
38AQI
50AQI
119AQI
63AQI
46AQI
99AQI
133AQI
108AQI
90AQI
84AQI
72AQI
53AQI
63AQI
59AQI
52AQI
39AQI
70AQI
78AQI
69AQI
37AQI
16AQI
23AQI
18AQI
20AQI
25AQI
35AQI
26AQI
17AQI
22AQI
26AQI
33AQI
17AQI
26AQI
39AQI
32AQI
32AQI
36AQI
28AQI
38AQI
19AQI
21AQI
23AQI
25AQI
38AQI
49AQI
44AQI
58AQI
65AQI
51AQI
42AQI
43AQI
54AQI
31AQI
21AQI
22AQI
37AQI
38AQI
38AQI
29AQI
31AQI
35AQI
27AQI
25AQI
24AQI
36AQI
33AQI
58AQI
65AQI
65AQI
60AQI
17AQI
23AQI
33AQI
40AQI
33AQI
37AQI
29AQI
24AQI
22AQI
49AQI
48AQI
50AQI
35AQI
43AQI
No. of days
202537AQI
Highest AQI recorded in
August50AQI
Lowest AQI recorded in
May22AQI
202433AQI
Highest AQI recorded in
January38AQI
Lowest AQI recorded in
November28AQI
202341AQI
Highest AQI recorded in
June76AQI
Lowest AQI recorded in
October32AQI
202235AQI
Highest AQI recorded in
June40AQI
Lowest AQI recorded in
August24AQI
202136AQI
Highest AQI recorded in
August44AQI
Lowest AQI recorded in
November31AQI
202034AQI
Highest AQI recorded in
June38AQI
Lowest AQI recorded in
October26AQI
Most & Least Polluted Years Over the Last 6 Years
Sarnia's annual 2025 AQI (37) shows an average percentage change of 2.2% (worsened AQI) compared to previous years: 2020 (34), 2021 (36), 2022 (35), 2023 (41), 2024 (33).