Portland 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!
July Air Quality Analysis
Portland Deering Oaks, Portland, Maine, United States
AQI Trends: Highest and Lowest
Same Day Analysis (12th July):
On this day, AQI across the 5 years varied significantly: 2026 ranks the most lowest AQI at 19 of Good air quality, showing improvement over 2025, 2024, 2023 and 2022 on the same day.
Day & Night AQI Trend: 11th Jul - 12th Jul 2026
Portland Deering Oaks, Portland, Maine, United States
5 AM11th Jul 2026
8 PM
4 AM12th Jul 2026
30AQI
14AQI
29AQI
20AQI
In the last 24 hours,
Portland Deering Oaks's AQI reached its highest point of 30 at 5 PM during the Day, while the lowest point, 14, was recorded at 8 PM during the Day between 11th Jul and 12th Jul 2026.
Day & Night AQI Trend : Jun - Jul 2026
Portland Deering Oaks, Portland, Maine, United States
23°C14/33°C
23°C15/32°C
20°C16/25°C
19°C13/25°C
19°C12/26°C
17°C14/21°C
20°C15/27°C
20°C15/26°C
19°C14/26°C
18°C13/26°C
18°C15/23°C
21°C15/28°C
21°C15/29°C
16°C14/17°C
17°C15/22°C
21°C15/30°C
22°C15/30°C
22°C15/31°C
23°C19/28°C
30°C23/39°C
30°C24/38°C
27°C21/35°C
23°C17/29°C
21°C17/26°C
18°C16/25°C
20°C16/25°C
23°C17/30°C
26°C20/33°C
22°C17/27°C
23°C15/31°C
24AQI
21AQI
26AQI
21AQI
2026 Days Vs Air Quality
Portland Deering Oaks, Portland, Maine, United States
93%
176
7%
14
Total number of days with different AQI categories in last 193 days in 2026 (172 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2026, 93% of 193 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
Portland Deering Oaks, Portland, Maine, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI (US)
56AQI (US)
57AQI (US)
32AQI (US)
61AQI (US)
47AQI (US)
40AQI (US)
26AQI (US)
34AQI (US)
22AQI (US)
18AQI (US)
24AQI (US)
28AQI (US)
37AQI (US)
41AQI (US)
24AQI (US)
30AQI (US)
52AQI (US)
28AQI (US)
29AQI (US)
42AQI (US)
39AQI (US)
40AQI (US)
79AQI (US)
33AQI (US)
38AQI (US)
31AQI (US)
39AQI (US)
64AQI (US)
81AQI (US)
60AQI (US)
33AQI (US)
52AQI (US)
54AQI (US)
44AQI (US)
50AQI (US)
31AQI (US)
36AQI (US)
50AQI (US)
42AQI (US)
38AQI (US)
33AQI (US)
34AQI (US)
34AQI (US)
54AQI (US)
51AQI (US)
40AQI (US)
31AQI (US)
32AQI (US)
29AQI (US)
23AQI (US)
34AQI (US)
34AQI (US)
30AQI (US)
42AQI (US)
44AQI (US)
28AQI (US)
25AQI (US)
28AQI (US)
31AQI (US)
43AQI (US)
33AQI (US)
32AQI (US)
20AQI (US)
14AQI (US)
24AQI (US)
17AQI (US)
28AQI (US)
34AQI (US)
30AQI (US)
22AQI (US)
32AQI (US)
20AQI (US)
29AQI (US)
27AQI (US)
29AQI (US)
27AQI (US)
23AQI (US)
25AQI (US)
19AQI (US)
21AQI (US)
34AQI (US)
34AQI (US)
24AQI (US)
20AQI (US)
18AQI (US)
14AQI (US)
15AQI (US)
21AQI (US)
22AQI (US)
22AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
29AQI (US)
28AQI (US)
23AQI (US)
35AQI (US)
22AQI (US)
22AQI (US)
24AQI (US)
20AQI (US)
23AQI (US)
19AQI (US)
19AQI (US)
24AQI (US)
24AQI (US)
35AQI (US)
24AQI (US)
18AQI (US)
18AQI (US)
17AQI (US)
28AQI (US)
26AQI (US)
19AQI (US)
19AQI (US)
18AQI (US)
26AQI (US)
20AQI (US)
14AQI (US)
18AQI (US)
25AQI (US)
32AQI (US)
36AQI (US)
21AQI (US)
21AQI (US)
21AQI (US)
17AQI (US)
23AQI (US)
19AQI (US)
20AQI (US)
38AQI (US)
43AQI (US)
54AQI (US)
46AQI (US)
53AQI (US)
49AQI (US)
40AQI (US)
35AQI (US)
40AQI (US)
42AQI (US)
42AQI (US)
20AQI (US)
16AQI (US)
13AQI (US)
17AQI (US)
16AQI (US)
14AQI (US)
15AQI (US)
16AQI (US)
16AQI (US)
21AQI (US)
26AQI (US)
39AQI (US)
22AQI (US)
12AQI (US)
17AQI (US)
26AQI (US)
26AQI (US)
38AQI (US)
26AQI (US)
27AQI (US)
19AQI (US)
11AQI (US)
23AQI (US)
19AQI (US)
13AQI (US)
15AQI (US)
14AQI (US)
19AQI (US)
13AQI (US)
17AQI (US)
25AQI (US)
21AQI (US)
16AQI (US)
15AQI (US)
25AQI (US)
33AQI (US)
27AQI (US)
31AQI (US)
32AQI (US)
27AQI (US)
35AQI (US)
33AQI (US)
32AQI (US)
28AQI (US)
26AQI (US)
24AQI (US)
24AQI (US)
19AQI (US)
41AQI (US)
38AQI (US)
25AQI (US)
24AQI (US)
29AQI (US)
21AQI (US)
28AQI (US)
No. of days
202629AQI (US)
Highest AQI (US) recorded in
January41AQI (US)
Lowest AQI (US) recorded in
June21AQI (US)
202529AQI (US)
Highest AQI (US) recorded in
June38AQI (US)
Lowest AQI (US) recorded in
April20AQI (US)
202424AQI (US)
Highest AQI (US) recorded in
July34AQI (US)
Lowest AQI (US) recorded in
March17AQI (US)
202326AQI (US)
Highest AQI (US) recorded in
July38AQI (US)
Lowest AQI (US) recorded in
January19AQI (US)
202222AQI (US)
Highest AQI (US) recorded in
January30AQI (US)
Lowest AQI (US) recorded in
August14AQI (US)
202123AQI (US)
Highest AQI (US) recorded in
June29AQI (US)
Lowest AQI (US) recorded in
September18AQI (US)
202026AQI (US)
Highest AQI (US) recorded in
December28AQI (US)
Lowest AQI (US) recorded in
November23AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Portland Deering Oaks's annual 2026 AQI (US) (29) shows an average percentage change of 16.9% (worsened AQI (US)) compared to previous years: 2020 (26), 2021 (23), 2022 (22), 2023 (26), 2024 (24), 2025 (29).