Malahide, Swords, Fingal, Ireland 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
Malahide, Swords, Fingal, Ireland
AQI Trends: Highest and Lowest
Same Day Analysis (21st September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 18 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Malahide, Swords, Fingal, Ireland
6 AM21st Sep 2025
8 PM
5 AM22nd Sep 2025
17AQI
14AQI
20AQI
16AQI
In the last 24 hours,
Malahide's AQI reached its highest point of 20 at 3 AM during the Night, while the lowest point, 14, was recorded at 11 AM during the Day between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Malahide, Swords, Fingal, Ireland
17°C16/21°C
17°C14/21°C
18°C14/23°C
16°C13/20°C
16°C12/20°C
14°C13/17°C
15°C13/18°C
14°C11/19°C
15°C13/18°C
14°C11/17°C
14°C9/18°C
14°C10/16°C
13°C9/17°C
14°C10/18°C
16°C12/18°C
16°C11/17°C
13°C8/17°C
14°C11/16°C
14°C11/16°C
12°C10/14°C
12°C9/15°C
11°C9/15°C
12°C8/17°C
13°C12/14°C
13°C9/16°C
16°C12/19°C
15°C10/20°C
15°C12/16°C
11°C9/15°C
9°C5/13°C
--°C/°C
21AQI
20AQI
21AQI
20AQI
2025 Days Vs Air Quality
Malahide, Swords, Fingal, Ireland
88%
233
12%
31
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 265 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
Malahide, Swords, Fingal, Ireland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI
25AQI
37AQI
36AQI
29AQI
19AQI
20AQI
32AQI
66AQI
63AQI
40AQI
51AQI
36AQI
19AQI
26AQI
43AQI
36AQI
46AQI
47AQI
55AQI
47AQI
37AQI
29AQI
27AQI
26AQI
23AQI
37AQI
33AQI
23AQI
24AQI
31AQI
55AQI
34AQI
30AQI
22AQI
20AQI
53AQI
49AQI
36AQI
38AQI
51AQI
39AQI
52AQI
53AQI
54AQI
55AQI
50AQI
58AQI
66AQI
66AQI
36AQI
31AQI
26AQI
29AQI
28AQI
26AQI
23AQI
21AQI
37AQI
32AQI
39AQI
24AQI
27AQI
24AQI
35AQI
50AQI
47AQI
62AQI
82AQI
54AQI
26AQI
24AQI
28AQI
36AQI
34AQI
21AQI
34AQI
62AQI
70AQI
66AQI
59AQI
32AQI
24AQI
23AQI
33AQI
24AQI
20AQI
25AQI
37AQI
45AQI
38AQI
37AQI
50AQI
65AQI
62AQI
47AQI
39AQI
50AQI
65AQI
55AQI
59AQI
56AQI
40AQI
17AQI
18AQI
18AQI
14AQI
21AQI
31AQI
50AQI
31AQI
20AQI
21AQI
39AQI
37AQI
38AQI
19AQI
20AQI
30AQI
44AQI
60AQI
38AQI
25AQI
21AQI
20AQI
20AQI
22AQI
24AQI
26AQI
34AQI
35AQI
34AQI
39AQI
33AQI
32AQI
29AQI
30AQI
32AQI
30AQI
30AQI
30AQI
26AQI
30AQI
24AQI
19AQI
18AQI
15AQI
16AQI
14AQI
15AQI
18AQI
20AQI
23AQI
23AQI
24AQI
17AQI
14AQI
14AQI
22AQI
55AQI
43AQI
34AQI
29AQI
29AQI
27AQI
24AQI
23AQI
31AQI
28AQI
28AQI
27AQI
38AQI
38AQI
26AQI
22AQI
17AQI
16AQI
16AQI
16AQI
17AQI
19AQI
15AQI
16AQI
15AQI
18AQI
17AQI
16AQI
16AQI
18AQI
17AQI
19AQI
21AQI
24AQI
25AQI
25AQI
20AQI
19AQI
20AQI
19AQI
17AQI
18AQI
20AQI
17AQI
27AQI
50AQI
56AQI
39AQI
31AQI
25AQI
21AQI
16AQI
17AQI
19AQI
20AQI
20AQI
22AQI
24AQI
28AQI
26AQI
22AQI
23AQI
24AQI
26AQI
38AQI
52AQI
48AQI
36AQI
38AQI
39AQI
35AQI
35AQI
25AQI
21AQI
21AQI
24AQI
26AQI
29AQI
29AQI
25AQI
21AQI
20AQI
19AQI
21AQI
23AQI
22AQI
21AQI
15AQI
17AQI
17AQI
21AQI
21AQI
20AQI
19AQI
20AQI
18AQI
16AQI
18AQI
19AQI
19AQI
19AQI
21AQI
20AQI
20AQI
18AQI
35AQI
41AQI
39AQI
38AQI
27AQI
25AQI
22AQI
28AQI
19AQI
No. of days
202531AQI
Highest AQI recorded in
February41AQI
Lowest AQI recorded in
September19AQI
202426AQI
Highest AQI recorded in
September41AQI
Lowest AQI recorded in
April19AQI
202318AQI
Highest AQI recorded in
November24AQI
Lowest AQI recorded in
February15AQI
202217AQI
Highest AQI recorded in
December20AQI
Lowest AQI recorded in
November14AQI
Most & Least Polluted Years Over the Last 4 Years
Malahide's annual 2025 AQI (31) shows an average percentage change of 55.6% (worsened AQI) compared to previous years: 2022 (17), 2023 (18), 2024 (26).