Cluj Napoca, Judetul Cluj, Romania 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
Cluj Napoca, Judetul Cluj, Romania
AQI Trends: Highest and Lowest
Same Day Analysis (15th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 29 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Cluj Napoca, Judetul Cluj, Romania
6 AM16th Sep 2025
8 PM
5 AM17th Sep 2025
28AQI
23AQI
28AQI
18AQI
In the last 24 hours,
Cluj Napoca's AQI reached its highest point of 28 at 9 AM during the Day, while the lowest point, 18, was recorded at 4 AM during the Night between 16th Sep and 17th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Cluj Napoca, Judetul Cluj, Romania
19°C13/25°C
20°C13/27°C
21°C13/29°C
22°C15/31°C
20°C13/27°C
16°C11/20°C
13°C7/18°C
14°C6/22°C
16°C9/25°C
19°C11/27°C
21°C12/30°C
22°C12/33°C
22°C13/32°C
19°C15/28°C
19°C14/25°C
21°C14/28°C
23°C16/31°C
23°C16/29°C
22°C16/30°C
22°C15/29°C
21°C15/29°C
19°C13/27°C
16°C13/20°C
19°C12/26°C
18°C15/21°C
18°C15/23°C
19°C15/25°C
17°C13/24°C
16°C12/22°C
17°C11/24°C
--°C/°C
32AQI
31AQI
32AQI
31AQI
2025 Days Vs Air Quality
Cluj Napoca, Judetul Cluj, Romania
93%
102
7%
8
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% 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
Cluj Napoca, Judetul Cluj, Romania
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
40AQI
36AQI
34AQI
36AQI
37AQI
40AQI
41AQI
50AQI
56AQI
59AQI
57AQI
52AQI
55AQI
64AQI
51AQI
48AQI
40AQI
41AQI
42AQI
48AQI
47AQI
51AQI
46AQI
38AQI
38AQI
39AQI
40AQI
40AQI
35AQI
36AQI
34AQI
29AQI
29AQI
27AQI
27AQI
25AQI
31AQI
34AQI
33AQI
37AQI
41AQI
36AQI
31AQI
33AQI
33AQI
32AQI
38AQI
39AQI
38AQI
36AQI
26AQI
25AQI
24AQI
35AQI
36AQI
27AQI
23AQI
30AQI
33AQI
32AQI
26AQI
22AQI
23AQI
24AQI
25AQI
28AQI
28AQI
28AQI
28AQI
28AQI
26AQI
26AQI
26AQI
25AQI
28AQI
31AQI
32AQI
33AQI
32AQI
34AQI
34AQI
33AQI
33AQI
34AQI
34AQI
34AQI
32AQI
31AQI
28AQI
28AQI
29AQI
30AQI
29AQI
30AQI
30AQI
31AQI
32AQI
33AQI
42AQI
33AQI
33AQI
33AQI
33AQI
34AQI
35AQI
34AQI
33AQI
33AQI
33AQI
29AQI
37AQI
44AQI
31AQI
30AQI
33AQI
No. of days
202535AQI
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
August30AQI
Most & Least Polluted Years Over the Last 1 Years
Cluj Napoca's annual 2025 AQI (35) shows an average percentage change of NaN% (improved AQI) compared to previous years: .