Cosham, Portsmouth, United Kingdom Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Cosham, Portsmouth, United Kingdom
AQI Trends: Highest and Lowest
Same Day Analysis (6th August ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 29 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 6th Aug - 7th Aug 2025
Cosham, Portsmouth, United Kingdom
5 AM6th Aug 2025
9 PM
4 AM7th Aug 2025
34AQI
26AQI
33AQI
28AQI
In the last 24 hours,
Cosham's AQI reached its highest point of 34 at 10 AM during the Day, while the lowest point, 26, was recorded at 3 PM during the Day between 6th Aug and 7th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Cosham, Portsmouth, United Kingdom
17°C12/21°C
18°C13/22°C
21°C17/25°C
20°C17/23°C
20°C17/24°C
19°C15/23°C
18°C16/21°C
18°C15/20°C
19°C14/23°C
20°C18/23°C
20°C17/23°C
18°C17/21°C
18°C16/20°C
18°C15/22°C
18°C16/21°C
18°C14/22°C
19°C16/23°C
19°C16/22°C
19°C15/22°C
18°C15/22°C
18°C13/21°C
16°C14/18°C
19°C15/24°C
18°C16/22°C
17°C12/21°C
17°C13/21°C
18°C14/22°C
18°C14/20°C
17°C12/22°C
17°C13/19°C
--°C/°C
25AQI
25AQI
25AQI
25AQI
2025 Days Vs Air Quality
Cosham, Portsmouth, United Kingdom
75%
163
24%
53
0.9%
2
Total number of days with different AQI categories in last 219 days in 2025 (146 days remaining)
Under WHO’s Safe Air Quality Limits: 75%
Health Risk Level:
Low
In 2025, 75% of 219 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
Cosham, Portsmouth, United Kingdom
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
34AQI
27AQI
40AQI
59AQI
29AQI
27AQI
24AQI
31AQI
40AQI
49AQI
60AQI
64AQI
53AQI
54AQI
54AQI
55AQI
52AQI
62AQI
65AQI
57AQI
67AQI
68AQI
53AQI
43AQI
36AQI
42AQI
35AQI
33AQI
27AQI
27AQI
32AQI
30AQI
42AQI
57AQI
37AQI
37AQI
49AQI
37AQI
63AQI
46AQI
86AQI
77AQI
75AQI
71AQI
65AQI
84AQI
70AQI
68AQI
71AQI
78AQI
54AQI
34AQI
46AQI
40AQI
31AQI
34AQI
30AQI
26AQI
37AQI
46AQI
54AQI
81AQI
80AQI
108AQI
87AQI
54AQI
56AQI
64AQI
101AQI
91AQI
36AQI
28AQI
37AQI
29AQI
29AQI
26AQI
48AQI
61AQI
64AQI
57AQI
47AQI
52AQI
84AQI
81AQI
47AQI
47AQI
31AQI
25AQI
30AQI
34AQI
38AQI
42AQI
56AQI
63AQI
51AQI
30AQI
34AQI
50AQI
44AQI
41AQI
63AQI
59AQI
49AQI
24AQI
39AQI
21AQI
26AQI
33AQI
33AQI
31AQI
54AQI
25AQI
23AQI
45AQI
52AQI
56AQI
62AQI
51AQI
50AQI
56AQI
51AQI
49AQI
36AQI
20AQI
19AQI
20AQI
20AQI
20AQI
23AQI
23AQI
24AQI
23AQI
25AQI
27AQI
28AQI
26AQI
26AQI
31AQI
29AQI
24AQI
27AQI
28AQI
23AQI
24AQI
20AQI
22AQI
21AQI
19AQI
21AQI
19AQI
22AQI
22AQI
20AQI
22AQI
20AQI
19AQI
18AQI
17AQI
19AQI
41AQI
40AQI
32AQI
32AQI
33AQI
32AQI
26AQI
24AQI
25AQI
26AQI
28AQI
32AQI
32AQI
31AQI
25AQI
23AQI
21AQI
19AQI
20AQI
19AQI
18AQI
21AQI
28AQI
30AQI
20AQI
19AQI
19AQI
18AQI
19AQI
19AQI
20AQI
21AQI
23AQI
22AQI
24AQI
29AQI
27AQI
27AQI
24AQI
22AQI
21AQI
20AQI
18AQI
17AQI
18AQI
34AQI
41AQI
43AQI
30AQI
30AQI
25AQI
23AQI
22AQI
22AQI
21AQI
24AQI
24AQI
23AQI
29AQI
45AQI
53AQI
55AQI
43AQI
25AQI
25AQI
24AQI
24AQI
No. of days
202538AQI
Highest AQI recorded in
March55AQI
Lowest AQI recorded in
August24AQI
202425AQI
Highest AQI recorded in
November46AQI
Lowest AQI recorded in
September18AQI
202321AQI
Highest AQI recorded in
April25AQI
Lowest AQI recorded in
March18AQI
202219AQI
Highest AQI recorded in
November19AQI
Lowest AQI recorded in
November19AQI
Most & Least Polluted Years Over the Last 4 Years
Cosham's annual 2025 AQI (38) shows an average percentage change of 79.1% (worsened AQI) compared to previous years: 2022 (19), 2023 (21), 2024 (25).