Leeuwarden, Fryslan, Netherlands 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
Leeuwarden, Fryslan, Netherlands
AQI Trends: Highest and Lowest
Same Day Analysis (22nd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 20 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Sep - 23rd Sep 2025
Leeuwarden, Fryslan, Netherlands
6 AM22nd Sep 2025
8 PM
5 AM23rd Sep 2025
23AQI
18AQI
44AQI
18AQI
In the last 24 hours,
Leeuwarden's AQI reached its highest point of 44 at 3 AM during the Night, while the lowest point, 18, was recorded at 5 AM during the Night between 22nd Sep and 23rd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Leeuwarden, Fryslan, Netherlands
15°C10/21°C
16°C10/22°C
20°C12/27°C
19°C15/25°C
18°C13/23°C
17°C11/25°C
18°C13/23°C
19°C16/22°C
18°C15/24°C
18°C12/23°C
18°C15/24°C
18°C14/24°C
16°C12/21°C
17°C11/23°C
20°C13/27°C
18°C13/23°C
14°C11/17°C
15°C10/20°C
16°C13/19°C
14°C12/17°C
13°C10/18°C
14°C10/19°C
16°C13/17°C
14°C13/16°C
14°C12/16°C
19°C17/21°C
19°C15/24°C
18°C16/24°C
14°C10/16°C
12°C9/15°C
--°C/°C
22AQI
19AQI
21AQI
19AQI
2025 Days Vs Air Quality
Leeuwarden, Fryslan, Netherlands
83%
221
17%
44
Total number of days with different AQI categories in last 266 days in 2025 (99 days remaining)
Under WHO’s Safe Air Quality Limits: 83%
Health Risk Level:
Low
In 2025, 83% of 266 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
Leeuwarden, Fryslan, Netherlands
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
39AQI
33AQI
37AQI
39AQI
38AQI
30AQI
24AQI
26AQI
34AQI
30AQI
31AQI
29AQI
40AQI
50AQI
46AQI
46AQI
50AQI
47AQI
54AQI
64AQI
65AQI
64AQI
59AQI
53AQI
47AQI
43AQI
32AQI
29AQI
26AQI
27AQI
27AQI
30AQI
38AQI
45AQI
57AQI
55AQI
51AQI
44AQI
54AQI
67AQI
73AQI
76AQI
79AQI
82AQI
72AQI
71AQI
66AQI
61AQI
59AQI
56AQI
58AQI
55AQI
52AQI
47AQI
37AQI
40AQI
35AQI
30AQI
30AQI
33AQI
37AQI
46AQI
54AQI
68AQI
70AQI
63AQI
62AQI
68AQI
77AQI
68AQI
55AQI
47AQI
38AQI
34AQI
30AQI
28AQI
30AQI
35AQI
53AQI
59AQI
57AQI
57AQI
64AQI
66AQI
58AQI
54AQI
57AQI
51AQI
46AQI
41AQI
36AQI
34AQI
35AQI
38AQI
32AQI
26AQI
27AQI
26AQI
27AQI
30AQI
36AQI
39AQI
42AQI
38AQI
39AQI
35AQI
33AQI
28AQI
24AQI
21AQI
23AQI
32AQI
35AQI
37AQI
31AQI
32AQI
31AQI
33AQI
37AQI
31AQI
32AQI
42AQI
24AQI
22AQI
20AQI
20AQI
20AQI
20AQI
20AQI
20AQI
23AQI
21AQI
22AQI
24AQI
24AQI
25AQI
25AQI
26AQI
26AQI
27AQI
29AQI
26AQI
21AQI
23AQI
22AQI
21AQI
21AQI
26AQI
26AQI
26AQI
27AQI
26AQI
26AQI
25AQI
24AQI
21AQI
18AQI
18AQI
18AQI
22AQI
41AQI
39AQI
36AQI
41AQI
43AQI
35AQI
33AQI
32AQI
37AQI
30AQI
25AQI
26AQI
27AQI
25AQI
24AQI
25AQI
24AQI
27AQI
28AQI
26AQI
25AQI
26AQI
39AQI
24AQI
22AQI
21AQI
23AQI
19AQI
20AQI
25AQI
25AQI
22AQI
21AQI
32AQI
33AQI
29AQI
24AQI
23AQI
23AQI
31AQI
38AQI
30AQI
23AQI
26AQI
25AQI
27AQI
25AQI
24AQI
23AQI
25AQI
20AQI
20AQI
19AQI
19AQI
21AQI
21AQI
22AQI
25AQI
25AQI
26AQI
27AQI
27AQI
28AQI
38AQI
48AQI
58AQI
45AQI
40AQI
25AQI
20AQI
19AQI
23AQI
16AQI
17AQI
17AQI
19AQI
20AQI
27AQI
25AQI
29AQI
22AQI
19AQI
18AQI
18AQI
19AQI
17AQI
20AQI
18AQI
19AQI
22AQI
22AQI
20AQI
21AQI
19AQI
17AQI
17AQI
19AQI
19AQI
17AQI
18AQI
17AQI
18AQI
24AQI
21AQI
20AQI
41AQI
54AQI
52AQI
32AQI
24AQI
28AQI
25AQI
26AQI
19AQI
No. of days
202534AQI
Highest AQI recorded in
February54AQI
Lowest AQI recorded in
September19AQI
202426AQI
Highest AQI recorded in
November33AQI
Lowest AQI recorded in
January12AQI
202323AQI
Highest AQI recorded in
June33AQI
Lowest AQI recorded in
November9AQI
202225AQI
Highest AQI recorded in
March30AQI
Lowest AQI recorded in
November18AQI
202125AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
December18AQI
202024AQI
Highest AQI recorded in
August30AQI
Lowest AQI recorded in
December18AQI
Most & Least Polluted Years Over the Last 6 Years
Leeuwarden's annual 2025 AQI (34) shows an average percentage change of 37.7% (worsened AQI) compared to previous years: 2020 (24), 2021 (25), 2022 (25), 2023 (23), 2024 (26).