Cluj Napoca, Cluj, Romania Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Cluj Napoca, Cluj, Romania
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 55 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Oct - 4th Oct 2025
Cluj Napoca, Cluj, Romania
7 AM3rd Oct 2025
7 PM
6 AM4th Oct 2025
54AQI
45AQI
64AQI
48AQI
In the last 24 hours,
Cluj Napoca's AQI reached its highest point of 64 at 11 PM during the Night, while the lowest point, 45, was recorded at 2 PM during the Day between 3rd Oct and 4th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Cluj Napoca, Cluj, Romania
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
14°C10/19°C
13°C8/18°C
15°C9/21°C
17°C11/25°C
19°C13/27°C
19°C12/27°C
18°C12/26°C
19°C13/26°C
15°C11/20°C
11°C9/13°C
11°C7/15°C
10°C5/17°C
10°C6/14°C
9°C5/13°C
8°C5/12°C
8°C6/10°C
7°C6/10°C
--°C/°C
34AQI
31AQI
36AQI
32AQI
2025 Days Vs Air Quality
Cluj Napoca, Cluj, Romania
67%
186
33%
90
Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)
Under WHO’s Safe Air Quality Limits: 67%
Health Risk Level:
Moderate
In 2025, 67% of 277 days were within WHO’s safe air quality limits, and 33% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
Annual Air Quality Insights
Cluj Napoca, Cluj, Romania
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
62AQI
65AQI
61AQI
59AQI
59AQI
57AQI
58AQI
59AQI
58AQI
56AQI
55AQI
53AQI
52AQI
54AQI
57AQI
57AQI
58AQI
60AQI
59AQI
60AQI
61AQI
61AQI
62AQI
61AQI
60AQI
60AQI
60AQI
59AQI
59AQI
59AQI
61AQI
60AQI
61AQI
60AQI
60AQI
60AQI
60AQI
60AQI
60AQI
60AQI
61AQI
61AQI
61AQI
61AQI
62AQI
62AQI
61AQI
62AQI
62AQI
62AQI
61AQI
61AQI
61AQI
60AQI
61AQI
61AQI
62AQI
61AQI
61AQI
61AQI
60AQI
60AQI
59AQI
59AQI
59AQI
58AQI
58AQI
59AQI
60AQI
60AQI
58AQI
56AQI
55AQI
54AQI
51AQI
50AQI
47AQI
47AQI
48AQI
49AQI
52AQI
53AQI
54AQI
54AQI
53AQI
53AQI
52AQI
52AQI
51AQI
50AQI
50AQI
49AQI
49AQI
48AQI
47AQI
45AQI
43AQI
42AQI
41AQI
40AQI
40AQI
39AQI
39AQI
37AQI
36AQI
36AQI
36AQI
36AQI
34AQI
34AQI
31AQI
30AQI
29AQI
29AQI
29AQI
29AQI
28AQI
29AQI
29AQI
29AQI
30AQI
33AQI
37AQI
42AQI
43AQI
42AQI
40AQI
39AQI
41AQI
38AQI
30AQI
41AQI
40AQI
37AQI
39AQI
33AQI
32AQI
32AQI
31AQI
35AQI
36AQI
43AQI
44AQI
33AQI
30AQI
26AQI
31AQI
26AQI
32AQI
31AQI
32AQI
34AQI
34AQI
36AQI
36AQI
43AQI
52AQI
54AQI
54AQI
47AQI
50AQI
58AQI
46AQI
40AQI
36AQI
38AQI
38AQI
44AQI
43AQI
48AQI
43AQI
34AQI
32AQI
35AQI
37AQI
35AQI
33AQI
34AQI
33AQI
30AQI
30AQI
27AQI
25AQI
25AQI
28AQI
32AQI
29AQI
37AQI
41AQI
36AQI
28AQI
28AQI
29AQI
31AQI
37AQI
40AQI
38AQI
34AQI
26AQI
25AQI
24AQI
34AQI
36AQI
30AQI
25AQI
28AQI
31AQI
30AQI
25AQI
22AQI
22AQI
25AQI
25AQI
27AQI
29AQI
28AQI
28AQI
28AQI
26AQI
25AQI
25AQI
26AQI
29AQI
31AQI
32AQI
32AQI
32AQI
34AQI
34AQI
33AQI
33AQI
34AQI
34AQI
34AQI
33AQI
31AQI
29AQI
28AQI
29AQI
31AQI
29AQI
30AQI
30AQI
31AQI
32AQI
33AQI
36AQI
33AQI
33AQI
33AQI
34AQI
34AQI
35AQI
34AQI
33AQI
33AQI
33AQI
29AQI
27AQI
23AQI
19AQI
22AQI
33AQI
34AQI
28AQI
27AQI
31AQI
28AQI
24AQI
23AQI
35AQI
42AQI
41AQI
50AQI
57AQI
55AQI
59AQI
61AQI
55AQI
37AQI
35AQI
40AQI
30AQI
30AQI
31AQI
54AQI
No. of days
202542AQI
Highest AQI recorded in
February61AQI
Lowest AQI recorded in
July30AQI
202445AQI
Highest AQI recorded in
January75AQI
Lowest AQI recorded in
September16AQI
202349AQI
Highest AQI recorded in
December70AQI
Lowest AQI recorded in
June32AQI
202233AQI
Highest AQI recorded in
December82AQI
Lowest AQI recorded in
August14AQI
202126AQI
Highest AQI recorded in
January34AQI
Lowest AQI recorded in
September19AQI
202011AQI
Highest AQI recorded in
November18AQI
Lowest AQI recorded in
June6AQI
Most & Least Polluted Years Over the Last 6 Years
Cluj Napoca's annual 2025 AQI (42) shows an average percentage change of 70.1% (worsened AQI) compared to previous years: 2020 (11), 2021 (26), 2022 (33), 2023 (49), 2024 (45).