Cluj Napoca, Cluj County, 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, Cluj County, Romania
AQI Trends: Highest and Lowest
Same Day Analysis (16th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 27 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, Cluj County, 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, Cluj County, 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, Cluj County, Romania
91%
101
9%
10
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% 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, Cluj County, Romania
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
44AQI
46AQI
47AQI
50AQI
46AQI
47AQI
45AQI
56AQI
60AQI
62AQI
63AQI
60AQI
62AQI
69AQI
57AQI
52AQI
47AQI
48AQI
50AQI
53AQI
47AQI
50AQI
47AQI
41AQI
39AQI
39AQI
40AQI
41AQI
39AQI
37AQI
36AQI
34AQI
35AQI
36AQI
36AQI
33AQI
37AQI
39AQI
37AQI
42AQI
44AQI
42AQI
35AQI
37AQI
36AQI
38AQI
36AQI
35AQI
34AQI
32AQI
23AQI
22AQI
23AQI
32AQI
32AQI
25AQI
23AQI
28AQI
33AQI
31AQI
25AQI
21AQI
22AQI
25AQI
25AQI
27AQI
28AQI
27AQI
27AQI
28AQI
26AQI
25AQI
25AQI
26AQI
29AQI
31AQI
32AQI
33AQI
32AQI
34AQI
34AQI
33AQI
33AQI
34AQI
34AQI
34AQI
33AQI
31AQI
28AQI
28AQI
30AQI
30AQI
29AQI
30AQI
30AQI
31AQI
32AQI
33AQI
38AQI
34AQI
33AQI
32AQI
34AQI
34AQI
35AQI
34AQI
33AQI
33AQI
33AQI
29AQI
27AQI
46AQI
48AQI
32AQI
30AQI
33AQI
No. of days
202536AQI
Highest AQI recorded in
June48AQI
Lowest AQI recorded in
August30AQI
Most & Least Polluted Years Over the Last 1 Years
Cluj Napoca's annual 2025 AQI (36) shows an average percentage change of NaN% (improved AQI) compared to previous years: .