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
Port Huron, Michigan, United States
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 52 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Oct - 3rd Oct 2025
Port Huron, Michigan, United States
7 AM2nd Oct 2025
7 PM
6 AM3rd Oct 2025
42AQI
14AQI
52AQI
38AQI
In the last 24 hours,
Port Huron's AQI reached its highest point of 52 at 12 AM during the Night, while the lowest point, 14, was recorded at 7 AM during the Day between 2nd Oct and 3rd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Port Huron, Michigan, United States
--°C/°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
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
37AQI
34AQI
36AQI
35AQI
2025 Days Vs Air Quality
Port Huron, Michigan, United States
82%
227
16%
45
1%
4
Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)
Under WHO’s Safe Air Quality Limits: 82%
Health Risk Level:
Low
In 2025, 82% of 277 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
Port Huron, Michigan, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
23AQI
22AQI
23AQI
23AQI
22AQI
23AQI
24AQI
27AQI
59AQI
57AQI
52AQI
30AQI
25AQI
27AQI
53AQI
37AQI
30AQI
25AQI
23AQI
26AQI
30AQI
42AQI
34AQI
56AQI
36AQI
30AQI
26AQI
25AQI
30AQI
49AQI
25AQI
36AQI
52AQI
24AQI
24AQI
33AQI
26AQI
42AQI
32AQI
38AQI
43AQI
32AQI
29AQI
41AQI
51AQI
37AQI
27AQI
25AQI
25AQI
25AQI
28AQI
53AQI
60AQI
55AQI
43AQI
37AQI
52AQI
24AQI
29AQI
29AQI
35AQI
38AQI
30AQI
29AQI
29AQI
31AQI
29AQI
36AQI
31AQI
28AQI
33AQI
50AQI
43AQI
22AQI
17AQI
25AQI
33AQI
22AQI
21AQI
17AQI
17AQI
20AQI
18AQI
19AQI
37AQI
40AQI
40AQI
40AQI
20AQI
17AQI
20AQI
21AQI
18AQI
19AQI
17AQI
19AQI
15AQI
29AQI
32AQI
29AQI
23AQI
37AQI
26AQI
14AQI
15AQI
27AQI
42AQI
38AQI
17AQI
22AQI
16AQI
40AQI
49AQI
39AQI
18AQI
21AQI
26AQI
35AQI
15AQI
27AQI
22AQI
16AQI
17AQI
23AQI
29AQI
25AQI
17AQI
19AQI
30AQI
22AQI
35AQI
26AQI
20AQI
27AQI
31AQI
23AQI
17AQI
13AQI
17AQI
20AQI
12AQI
11AQI
13AQI
27AQI
25AQI
28AQI
20AQI
30AQI
35AQI
23AQI
23AQI
28AQI
46AQI
70AQI
78AQI
86AQI
72AQI
94AQI
80AQI
54AQI
71AQI
77AQI
40AQI
35AQI
35AQI
36AQI
39AQI
33AQI
22AQI
36AQI
39AQI
42AQI
53AQI
54AQI
40AQI
50AQI
43AQI
28AQI
40AQI
33AQI
30AQI
42AQI
51AQI
48AQI
54AQI
55AQI
31AQI
42AQI
56AQI
45AQI
49AQI
38AQI
42AQI
74AQI
93AQI
86AQI
39AQI
30AQI
34AQI
30AQI
46AQI
22AQI
27AQI
45AQI
34AQI
57AQI
33AQI
45AQI
38AQI
49AQI
121AQI
62AQI
46AQI
101AQI
133AQI
107AQI
91AQI
80AQI
71AQI
54AQI
62AQI
58AQI
50AQI
36AQI
70AQI
78AQI
68AQI
35AQI
16AQI
23AQI
17AQI
19AQI
24AQI
33AQI
24AQI
16AQI
21AQI
26AQI
31AQI
17AQI
24AQI
38AQI
33AQI
32AQI
35AQI
25AQI
36AQI
19AQI
21AQI
22AQI
24AQI
36AQI
46AQI
42AQI
57AQI
65AQI
52AQI
42AQI
42AQI
54AQI
32AQI
21AQI
24AQI
38AQI
38AQI
37AQI
29AQI
31AQI
35AQI
29AQI
26AQI
24AQI
35AQI
33AQI
52AQI
33AQI
36AQI
29AQI
25AQI
23AQI
49AQI
48AQI
49AQI
35AQI
40AQI
No. of days
202536AQI
Highest AQI recorded in
August49AQI
Lowest AQI recorded in
May23AQI
202433AQI
Highest AQI recorded in
January37AQI
Lowest AQI recorded in
November28AQI
202341AQI
Highest AQI recorded in
June79AQI
Lowest AQI recorded in
October32AQI
202236AQI
Highest AQI recorded in
June39AQI
Lowest AQI recorded in
August26AQI
202137AQI
Highest AQI recorded in
August46AQI
Lowest AQI recorded in
September31AQI
202034AQI
Highest AQI recorded in
June39AQI
Lowest AQI recorded in
October26AQI
Most & Least Polluted Years Over the Last 6 Years
Port Huron's annual 2025 AQI (36) shows an average percentage change of 1.2% (worsened AQI) compared to previous years: 2020 (34), 2021 (37), 2022 (36), 2023 (41), 2024 (33).