Deering Oaks, Portland, 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
Deering Oaks, Portland, Maine, United States
AQI Trends: Highest and Lowest
Same Day Analysis (19th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 36 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 19th Oct - 20th Oct 2025
Deering Oaks, Portland, Maine, United States
6 AM19th Oct 2025
6 PM
5 AM20th Oct 2025
42AQI
8AQI
43AQI
11AQI
In the last 24 hours,
Deering Oaks's AQI reached its highest point of 43 at 6 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 19th Oct and 20th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Deering Oaks, Portland, Maine, United States
14°C11/19°C
14°C7/19°C
15°C9/20°C
18°C14/23°C
16°C15/17°C
17°C15/18°C
20°C17/24°C
17°C14/20°C
20°C16/28°C
19°C13/26°C
17°C15/22°C
14°C10/19°C
12°C8/18°C
14°C7/22°C
18°C10/27°C
17°C12/23°C
19°C14/25°C
19°C15/23°C
16°C10/18°C
10°C6/16°C
10°C3/16°C
12°C7/17°C
12°C9/15°C
13°C11/15°C
13°C10/17°C
13°C8/17°C
9°C7/12°C
12°C8/18°C
11°C7/16°C
12°C8/17°C
--°C/°C
29AQI
22AQI
28AQI
22AQI
2025 Days Vs Air Quality
Deering Oaks, Portland, Maine, United States
94%
274
6%
17
0.3%
1
Total number of days with different AQI categories in last 293 days in 2025 (72 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% 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
Deering Oaks, Portland, Maine, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI
20AQI
19AQI
18AQI
19AQI
20AQI
19AQI
17AQI
18AQI
20AQI
25AQI
31AQI
41AQI
25AQI
22AQI
37AQI
43AQI
34AQI
22AQI
23AQI
36AQI
50AQI
47AQI
45AQI
39AQI
36AQI
22AQI
21AQI
26AQI
24AQI
31AQI
21AQI
26AQI
33AQI
23AQI
27AQI
38AQI
27AQI
26AQI
23AQI
30AQI
40AQI
29AQI
23AQI
22AQI
22AQI
20AQI
19AQI
19AQI
25AQI
26AQI
20AQI
26AQI
30AQI
43AQI
44AQI
32AQI
29AQI
21AQI
27AQI
20AQI
28AQI
37AQI
33AQI
20AQI
18AQI
20AQI
20AQI
23AQI
28AQI
21AQI
22AQI
29AQI
24AQI
28AQI
21AQI
23AQI
24AQI
15AQI
14AQI
20AQI
17AQI
20AQI
23AQI
23AQI
19AQI
20AQI
18AQI
25AQI
23AQI
18AQI
17AQI
21AQI
21AQI
20AQI
13AQI
15AQI
15AQI
18AQI
20AQI
21AQI
16AQI
20AQI
17AQI
31AQI
18AQI
18AQI
23AQI
42AQI
16AQI
15AQI
25AQI
18AQI
18AQI
26AQI
22AQI
12AQI
17AQI
33AQI
21AQI
18AQI
29AQI
33AQI
23AQI
21AQI
18AQI
25AQI
25AQI
20AQI
13AQI
15AQI
20AQI
24AQI
27AQI
37AQI
33AQI
19AQI
14AQI
13AQI
12AQI
16AQI
18AQI
11AQI
11AQI
13AQI
16AQI
22AQI
28AQI
21AQI
23AQI
22AQI
21AQI
21AQI
22AQI
43AQI
62AQI
57AQI
50AQI
78AQI
78AQI
36AQI
41AQI
64AQI
37AQI
34AQI
31AQI
27AQI
24AQI
20AQI
30AQI
33AQI
29AQI
35AQI
47AQI
54AQI
50AQI
32AQI
25AQI
20AQI
24AQI
26AQI
35AQI
33AQI
45AQI
39AQI
33AQI
44AQI
53AQI
36AQI
28AQI
25AQI
21AQI
22AQI
19AQI
20AQI
30AQI
39AQI
34AQI
18AQI
26AQI
22AQI
25AQI
15AQI
24AQI
33AQI
47AQI
111AQI
76AQI
58AQI
57AQI
46AQI
69AQI
48AQI
25AQI
53AQI
81AQI
71AQI
50AQI
63AQI
32AQI
30AQI
33AQI
48AQI
62AQI
61AQI
47AQI
34AQI
32AQI
37AQI
18AQI
17AQI
19AQI
17AQI
28AQI
47AQI
38AQI
23AQI
17AQI
17AQI
20AQI
26AQI
19AQI
20AQI
29AQI
34AQI
29AQI
25AQI
26AQI
31AQI
23AQI
20AQI
19AQI
20AQI
22AQI
21AQI
22AQI
23AQI
26AQI
24AQI
23AQI
21AQI
22AQI
17AQI
18AQI
18AQI
21AQI
24AQI
19AQI
19AQI
18AQI
36AQI
40AQI
41AQI
21AQI
9AQI
15AQI
35AQI
49AQI
48AQI
44AQI
18AQI
16AQI
18AQI
23AQI
32AQI
35AQI
23AQI
15AQI
16AQI
28AQI
29AQI
36AQI
28AQI
27AQI
23AQI
20AQI
21AQI
38AQI
38AQI
37AQI
24AQI
27AQI
No. of days
202528AQI
Highest AQI recorded in
June38AQI
Lowest AQI recorded in
April20AQI
202425AQI
Highest AQI recorded in
August31AQI
Lowest AQI recorded in
March6AQI
202325AQI
Highest AQI recorded in
December25AQI
Lowest AQI recorded in
November19AQI
202031AQI
Highest AQI recorded in
June41AQI
Lowest AQI recorded in
September17AQI
Most & Least Polluted Years Over the Last 4 Years
Deering Oaks's annual 2025 AQI (28) shows an average percentage change of 6.3% (worsened AQI) compared to previous years: 2020 (31), 2023 (25), 2024 (25).