Square, Trondheim, Sor Trondelag, Norway 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
Square, Trondheim, Sor Trondelag, Norway
AQI Trends: Highest and Lowest
Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 15 of Good air quality, showing improvement over 2024 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Square, Trondheim, Sor Trondelag, Norway
6 AM16th Sep 2025
8 PM
5 AM17th Sep 2025
19AQI
12AQI
17AQI
13AQI
In the last 24 hours,
Square's AQI reached its highest point of 19 at 10 AM during the Day, while the lowest point, 12, was recorded at 6 AM during the Day between 16th Sep and 17th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Square, Trondheim, Sor Trondelag, Norway
13°C10/15°C
10°C9/11°C
10°C9/11°C
9°C8/10°C
9°C7/11°C
10°C7/11°C
10°C10/11°C
11°C8/13°C
11°C7/15°C
12°C9/15°C
14°C9/18°C
16°C12/20°C
15°C12/19°C
15°C11/20°C
16°C13/20°C
16°C13/19°C
14°C12/16°C
17°C13/21°C
15°C13/18°C
14°C12/16°C
14°C12/17°C
15°C12/20°C
15°C12/19°C
16°C12/20°C
16°C14/18°C
15°C13/18°C
13°C11/16°C
14°C10/18°C
14°C12/17°C
12°C10/14°C
--°C/°C
19AQI
17AQI
19AQI
17AQI
2025 Days Vs Air Quality
Square, Trondheim, Sor Trondelag, Norway
98%
255
2%
4
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 260 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
Square, Trondheim, Sor Trondelag, Norway
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
47AQI
29AQI
25AQI
24AQI
24AQI
30AQI
20AQI
38AQI
42AQI
29AQI
26AQI
22AQI
25AQI
24AQI
22AQI
23AQI
25AQI
29AQI
23AQI
26AQI
27AQI
26AQI
26AQI
27AQI
19AQI
19AQI
27AQI
28AQI
33AQI
28AQI
21AQI
28AQI
26AQI
21AQI
25AQI
21AQI
23AQI
31AQI
24AQI
21AQI
24AQI
31AQI
32AQI
25AQI
23AQI
30AQI
21AQI
23AQI
25AQI
29AQI
26AQI
23AQI
21AQI
22AQI
20AQI
30AQI
32AQI
26AQI
22AQI
24AQI
21AQI
20AQI
23AQI
21AQI
28AQI
26AQI
26AQI
24AQI
26AQI
30AQI
37AQI
31AQI
21AQI
17AQI
18AQI
17AQI
19AQI
20AQI
20AQI
30AQI
26AQI
22AQI
27AQI
21AQI
21AQI
20AQI
22AQI
21AQI
20AQI
29AQI
19AQI
34AQI
28AQI
21AQI
22AQI
19AQI
23AQI
23AQI
20AQI
16AQI
18AQI
20AQI
22AQI
26AQI
32AQI
28AQI
24AQI
20AQI
17AQI
14AQI
20AQI
20AQI
21AQI
40AQI
38AQI
36AQI
35AQI
29AQI
15AQI
17AQI
17AQI
17AQI
17AQI
17AQI
17AQI
21AQI
21AQI
19AQI
20AQI
19AQI
21AQI
25AQI
28AQI
21AQI
21AQI
18AQI
21AQI
20AQI
25AQI
22AQI
15AQI
14AQI
17AQI
16AQI
16AQI
18AQI
20AQI
18AQI
19AQI
18AQI
15AQI
20AQI
18AQI
16AQI
17AQI
22AQI
18AQI
17AQI
18AQI
17AQI
18AQI
20AQI
27AQI
25AQI
27AQI
30AQI
24AQI
24AQI
21AQI
19AQI
18AQI
16AQI
15AQI
19AQI
20AQI
20AQI
18AQI
20AQI
21AQI
21AQI
20AQI
22AQI
23AQI
21AQI
19AQI
18AQI
18AQI
19AQI
21AQI
22AQI
22AQI
21AQI
24AQI
30AQI
37AQI
52AQI
53AQI
51AQI
42AQI
45AQI
47AQI
44AQI
44AQI
48AQI
53AQI
41AQI
32AQI
26AQI
23AQI
26AQI
28AQI
47AQI
38AQI
27AQI
28AQI
24AQI
21AQI
19AQI
17AQI
18AQI
18AQI
19AQI
17AQI
18AQI
17AQI
29AQI
33AQI
16AQI
13AQI
17AQI
15AQI
13AQI
12AQI
13AQI
13AQI
13AQI
14AQI
16AQI
18AQI
23AQI
25AQI
24AQI
17AQI
18AQI
18AQI
17AQI
18AQI
20AQI
17AQI
20AQI
20AQI
23AQI
34AQI
32AQI
18AQI
15AQI
14AQI
14AQI
15AQI
27AQI
25AQI
23AQI
24AQI
19AQI
20AQI
33AQI
20AQI
20AQI
No. of days
202524AQI
Highest AQI recorded in
July33AQI
Lowest AQI recorded in
May19AQI
202424AQI
Highest AQI recorded in
April39AQI
Lowest AQI recorded in
February19AQI
202319AQI
Highest AQI recorded in
December36AQI
Lowest AQI recorded in
January5AQI
202224AQI
Highest AQI recorded in
December33AQI
Lowest AQI recorded in
February17AQI
202124AQI
Highest AQI recorded in
January55AQI
Lowest AQI recorded in
August9AQI
202018AQI
Highest AQI recorded in
December24AQI
Lowest AQI recorded in
July12AQI
Most & Least Polluted Years Over the Last 6 Years
Square's annual 2025 AQI (24) shows an average percentage change of 10.3% (worsened AQI) compared to previous years: 2020 (18), 2021 (24), 2022 (24), 2023 (19), 2024 (24).