Oldtown, 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
Oldtown, Swords, Fingal, Ireland
AQI Trends: Highest and Lowest
Same Day Analysis (17th September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 19 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Oldtown, Swords, Fingal, Ireland
6 AM17th Sep 2025
8 PM
5 AM18th Sep 2025
24AQI
16AQI
23AQI
17AQI
In the last 24 hours,
Oldtown's AQI reached its highest point of 24 at 1 PM during the Day, while the lowest point, 16, was recorded at 12 PM during the Day between 17th Sep and 18th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Oldtown, Swords, Fingal, Ireland
15°C14/17°C
14°C11/15°C
13°C9/17°C
16°C11/20°C
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
--°C/°C
21AQI
20AQI
22AQI
20AQI
2025 Days Vs Air Quality
Oldtown, Swords, Fingal, Ireland
91%
237
9%
23
Total number of days with different AQI categories in last 261 days in 2025 (104 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 261 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
Oldtown, Swords, Fingal, Ireland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
23AQI
41AQI
37AQI
33AQI
20AQI
20AQI
32AQI
64AQI
60AQI
40AQI
47AQI
34AQI
19AQI
21AQI
39AQI
30AQI
38AQI
44AQI
54AQI
44AQI
34AQI
32AQI
26AQI
28AQI
21AQI
29AQI
32AQI
23AQI
24AQI
28AQI
51AQI
32AQI
24AQI
22AQI
20AQI
43AQI
42AQI
34AQI
30AQI
45AQI
34AQI
38AQI
44AQI
48AQI
43AQI
38AQI
48AQI
57AQI
57AQI
29AQI
29AQI
25AQI
28AQI
28AQI
26AQI
22AQI
23AQI
35AQI
28AQI
36AQI
25AQI
23AQI
23AQI
30AQI
40AQI
40AQI
58AQI
69AQI
55AQI
25AQI
23AQI
25AQI
27AQI
26AQI
19AQI
29AQI
55AQI
62AQI
59AQI
58AQI
27AQI
22AQI
23AQI
30AQI
22AQI
21AQI
25AQI
36AQI
45AQI
34AQI
33AQI
43AQI
59AQI
55AQI
47AQI
37AQI
43AQI
53AQI
50AQI
55AQI
57AQI
39AQI
14AQI
17AQI
16AQI
15AQI
21AQI
25AQI
44AQI
29AQI
18AQI
18AQI
28AQI
27AQI
31AQI
16AQI
16AQI
25AQI
36AQI
53AQI
32AQI
21AQI
16AQI
14AQI
18AQI
21AQI
23AQI
23AQI
30AQI
28AQI
31AQI
33AQI
27AQI
26AQI
24AQI
23AQI
25AQI
26AQI
27AQI
28AQI
22AQI
26AQI
22AQI
16AQI
17AQI
15AQI
15AQI
15AQI
17AQI
16AQI
17AQI
19AQI
20AQI
21AQI
17AQI
15AQI
14AQI
30AQI
54AQI
39AQI
32AQI
30AQI
27AQI
26AQI
22AQI
23AQI
30AQI
26AQI
29AQI
26AQI
32AQI
30AQI
23AQI
20AQI
16AQI
15AQI
17AQI
17AQI
18AQI
18AQI
16AQI
16AQI
15AQI
18AQI
17AQI
16AQI
16AQI
18AQI
17AQI
19AQI
19AQI
22AQI
24AQI
23AQI
20AQI
19AQI
21AQI
19AQI
18AQI
19AQI
20AQI
17AQI
34AQI
52AQI
56AQI
40AQI
32AQI
26AQI
20AQI
16AQI
17AQI
19AQI
19AQI
20AQI
22AQI
23AQI
27AQI
28AQI
23AQI
24AQI
24AQI
26AQI
39AQI
52AQI
45AQI
35AQI
37AQI
38AQI
34AQI
35AQI
26AQI
21AQI
21AQI
24AQI
25AQI
28AQI
28AQI
25AQI
21AQI
19AQI
17AQI
20AQI
20AQI
21AQI
19AQI
22AQI
17AQI
17AQI
21AQI
21AQI
19AQI
19AQI
18AQI
16AQI
16AQI
16AQI
18AQI
19AQI
19AQI
33AQI
36AQI
35AQI
33AQI
24AQI
24AQI
23AQI
27AQI
19AQI
No. of days
202529AQI
Highest AQI recorded in
February36AQI
Lowest AQI recorded in
September19AQI
202447AQI
Highest AQI recorded in
April110AQI
Lowest AQI recorded in
September0AQI
202319AQI
Highest AQI recorded in
December45AQI
Lowest AQI recorded in
July10AQI
202219AQI
Highest AQI recorded in
October29AQI
Lowest AQI recorded in
November15AQI
Most & Least Polluted Years Over the Last 4 Years
Oldtown's annual 2025 AQI (29) shows an average percentage change of 19.07% (worsened AQI) compared to previous years: 2022 (19), 2023 (19), 2024 (47).