Holywood, Ards And North Down, United Kingdom Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Holywood, Ards And North Down, United Kingdom
AQI Trends: Highest and Lowest
Same Day Analysis (28th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 30 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Holywood, Ards And North Down, United Kingdom
6 AM29th Sep 2025
7 PM
5 AM30th Sep 2025
35AQI
24AQI
35AQI
24AQI
In the last 24 hours,
Holywood's AQI reached its highest point of 35 at 11 AM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Holywood, Ards And North Down, United Kingdom
15°C13/17°C
14°C13/16°C
13°C10/17°C
13°C12/14°C
13°C10/16°C
14°C11/16°C
16°C13/17°C
15°C12/17°C
12°C9/16°C
14°C12/15°C
14°C11/15°C
12°C11/14°C
12°C10/15°C
11°C9/14°C
12°C10/14°C
13°C12/15°C
13°C11/16°C
14°C12/17°C
14°C12/16°C
15°C13/16°C
12°C9/14°C
11°C9/12°C
10°C8/13°C
11°C8/13°C
12°C9/14°C
13°C11/15°C
13°C12/14°C
12°C9/14°C
11°C8/13°C
11°C9/14°C
--°C/°C
22AQI
20AQI
22AQI
21AQI
2025 Days Vs Air Quality
Holywood, Ards And North Down, United Kingdom
87%
237
13%
34
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 273 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
Holywood, Ards And North Down, United Kingdom
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI
29AQI
38AQI
41AQI
46AQI
20AQI
24AQI
37AQI
66AQI
60AQI
46AQI
53AQI
27AQI
22AQI
27AQI
38AQI
31AQI
36AQI
47AQI
55AQI
52AQI
40AQI
29AQI
27AQI
24AQI
26AQI
37AQI
29AQI
24AQI
26AQI
35AQI
56AQI
33AQI
26AQI
26AQI
24AQI
44AQI
42AQI
41AQI
44AQI
54AQI
40AQI
51AQI
50AQI
50AQI
56AQI
57AQI
62AQI
69AQI
74AQI
41AQI
37AQI
30AQI
32AQI
30AQI
25AQI
24AQI
24AQI
32AQI
33AQI
52AQI
35AQI
34AQI
33AQI
46AQI
53AQI
53AQI
71AQI
76AQI
36AQI
27AQI
26AQI
21AQI
28AQI
20AQI
25AQI
42AQI
64AQI
87AQI
87AQI
71AQI
30AQI
26AQI
24AQI
27AQI
24AQI
21AQI
26AQI
40AQI
37AQI
39AQI
44AQI
49AQI
56AQI
43AQI
40AQI
38AQI
46AQI
55AQI
52AQI
63AQI
65AQI
45AQI
16AQI
18AQI
17AQI
16AQI
22AQI
37AQI
30AQI
42AQI
24AQI
24AQI
43AQI
54AQI
41AQI
23AQI
30AQI
36AQI
49AQI
62AQI
39AQI
32AQI
21AQI
20AQI
29AQI
28AQI
26AQI
31AQI
43AQI
44AQI
47AQI
47AQI
37AQI
33AQI
30AQI
25AQI
28AQI
28AQI
32AQI
41AQI
30AQI
30AQI
26AQI
17AQI
17AQI
16AQI
18AQI
17AQI
18AQI
20AQI
19AQI
22AQI
24AQI
23AQI
20AQI
18AQI
17AQI
18AQI
65AQI
54AQI
38AQI
44AQI
43AQI
33AQI
26AQI
26AQI
34AQI
32AQI
27AQI
28AQI
40AQI
43AQI
27AQI
23AQI
19AQI
17AQI
18AQI
18AQI
22AQI
22AQI
17AQI
17AQI
15AQI
19AQI
18AQI
16AQI
17AQI
19AQI
17AQI
20AQI
21AQI
25AQI
28AQI
25AQI
24AQI
21AQI
22AQI
20AQI
19AQI
22AQI
22AQI
18AQI
51AQI
61AQI
57AQI
34AQI
28AQI
23AQI
21AQI
18AQI
20AQI
19AQI
20AQI
21AQI
22AQI
25AQI
37AQI
29AQI
23AQI
27AQI
26AQI
27AQI
30AQI
48AQI
47AQI
34AQI
38AQI
36AQI
29AQI
29AQI
19AQI
18AQI
18AQI
20AQI
22AQI
27AQI
26AQI
23AQI
22AQI
21AQI
20AQI
22AQI
26AQI
25AQI
20AQI
16AQI
18AQI
17AQI
23AQI
22AQI
19AQI
20AQI
21AQI
21AQI
18AQI
20AQI
22AQI
18AQI
18AQI
23AQI
22AQI
24AQI
18AQI
17AQI
19AQI
20AQI
25AQI
21AQI
19AQI
30AQI
36AQI
42AQI
41AQI
39AQI
30AQI
29AQI
24AQI
27AQI
21AQI
No. of days
202532AQI
Highest AQI recorded in
February42AQI
Lowest AQI recorded in
September21AQI
202430AQI
Highest AQI recorded in
November39AQI
Lowest AQI recorded in
July20AQI
202330AQI
Highest AQI recorded in
June37AQI
Lowest AQI recorded in
August22AQI
202233AQI
Highest AQI recorded in
March54AQI
Lowest AQI recorded in
August20AQI
202126AQI
Highest AQI recorded in
December36AQI
Lowest AQI recorded in
October22AQI
202022AQI
Highest AQI recorded in
April33AQI
Lowest AQI recorded in
July16AQI
Most & Least Polluted Years Over the Last 6 Years
Holywood's annual 2025 AQI (32) shows an average percentage change of 15.6% (worsened AQI) compared to previous years: 2020 (22), 2021 (26), 2022 (33), 2023 (30), 2024 (30).