Prospect Harbor, Maine, 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
Prospect Harbor, Maine, United States
AQI Trends: Highest and Lowest
Same Day Analysis (19th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 23 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Prospect Harbor, Maine, United States
6 AM18th Oct 2025
6 PM
5 AM19th Oct 2025
36AQI
23AQI
47AQI
21AQI
In the last 24 hours,
Prospect Harbor's AQI reached its highest point of 47 at 9 PM during the Night, while the lowest point, 21, was recorded at 3 AM during the Night between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Prospect Harbor, Maine, United States
--°C/°C
12°C8/17°C
11°C7/15°C
13°C9/17°C
14°C13/17°C
14°C13/16°C
13°C10/16°C
17°C14/21°C
15°C13/19°C
15°C12/18°C
16°C12/23°C
14°C12/18°C
12°C9/15°C
11°C7/15°C
13°C9/17°C
15°C11/21°C
14°C12/18°C
15°C13/21°C
14°C13/17°C
14°C9/15°C
9°C6/12°C
9°C4/14°C
12°C9/16°C
12°C9/14°C
11°C9/14°C
12°C10/15°C
11°C9/14°C
9°C8/11°C
11°C10/13°C
11°C10/14°C
10°C7/13°C
28AQI
25AQI
27AQI
24AQI
2025 Days Vs Air Quality
Prospect Harbor, Maine, United States
95%
196
5%
11
Total number of days with different AQI categories in last 293 days in 2025 (72 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 293 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Prospect Harbor, Maine, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
19AQI
19AQI
21AQI
18AQI
17AQI
19AQI
21AQI
20AQI
16AQI
15AQI
19AQI
19AQI
17AQI
17AQI
14AQI
16AQI
11AQI
15AQI
14AQI
11AQI
14AQI
14AQI
14AQI
14AQI
15AQI
16AQI
16AQI
20AQI
23AQI
24AQI
13AQI
19AQI
28AQI
30AQI
16AQI
22AQI
25AQI
21AQI
17AQI
21AQI
15AQI
21AQI
17AQI
13AQI
15AQI
18AQI
18AQI
19AQI
25AQI
23AQI
23AQI
15AQI
15AQI
13AQI
15AQI
19AQI
15AQI
12AQI
12AQI
15AQI
23AQI
26AQI
26AQI
20AQI
18AQI
21AQI
19AQI
22AQI
33AQI
44AQI
53AQI
49AQI
51AQI
55AQI
40AQI
36AQI
56AQI
30AQI
28AQI
28AQI
27AQI
21AQI
19AQI
21AQI
25AQI
20AQI
27AQI
38AQI
46AQI
48AQI
21AQI
22AQI
22AQI
17AQI
21AQI
28AQI
29AQI
37AQI
34AQI
23AQI
35AQI
47AQI
21AQI
23AQI
27AQI
28AQI
21AQI
19AQI
17AQI
30AQI
50AQI
21AQI
16AQI
26AQI
25AQI
24AQI
17AQI
27AQI
31AQI
43AQI
59AQI
55AQI
53AQI
49AQI
47AQI
57AQI
28AQI
22AQI
48AQI
69AQI
39AQI
24AQI
31AQI
43AQI
31AQI
28AQI
38AQI
56AQI
59AQI
39AQI
23AQI
25AQI
25AQI
14AQI
15AQI
20AQI
23AQI
22AQI
28AQI
32AQI
23AQI
16AQI
17AQI
19AQI
20AQI
18AQI
17AQI
24AQI
28AQI
27AQI
21AQI
20AQI
25AQI
22AQI
20AQI
18AQI
19AQI
21AQI
18AQI
18AQI
16AQI
20AQI
23AQI
23AQI
20AQI
18AQI
15AQI
16AQI
17AQI
19AQI
18AQI
17AQI
16AQI
19AQI
28AQI
21AQI
19AQI
14AQI
16AQI
29AQI
37AQI
39AQI
38AQI
38AQI
44AQI
35AQI
32AQI
27AQI
31AQI
27AQI
32AQI
28AQI
27AQI
26AQI
29AQI
23AQI
20AQI
17AQI
18AQI
32AQI
33AQI
29AQI
20AQI
30AQI
No. of days
202525AQI
Highest AQI recorded in
July33AQI
Lowest AQI recorded in
April17AQI
Most & Least Polluted Years Over the Last 1 Years
Prospect Harbor's annual 2025 AQI (25) shows an average percentage change of NaN% (improved AQI) compared to previous years: .