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!
September Air Quality Analysis
Cluj Napoca, Cluj, Romania
AQI Trends: Highest and Lowest
Same Day Analysis (28th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 44 of Good air quality, showing improvement over 2023 on the same day.
Day & Night AQI Trend: 28th Sep - 29th Sep 2026
Cluj Napoca, Cluj, Romania
7 AM28th Sep 2026
7 PM
6 AM29th Sep 2026
52AQI
25AQI
61AQI
40AQI
In the last 24 hours,
Cluj Napoca's AQI reached its highest point of 61 at 10 PM during the Night, while the lowest point, 25, was recorded at 1 PM during the Day between 28th Sep and 29th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Cluj Napoca, Cluj, Romania
24°C19/30°C
22°C16/25°C
21°C16/26°C
20°C16/25°C
21°C17/25°C
23°C18/29°C
17°C14/21°C
17°C12/23°C
19°C15/25°C
21°C16/27°C
21°C16/28°C
21°C16/31°C
14°C10/17°C
12°C9/16°C
15°C11/20°C
17°C14/21°C
18°C13/23°C
19°C14/25°C
16°C13/19°C
17°C14/22°C
18°C14/23°C
14°C8/18°C
9°C7/11°C
9°C7/11°C
11°C8/16°C
11°C9/14°C
14°C10/17°C
15°C11/19°C
14°C11/19°C
14°C10/18°C
40AQI
27AQI
45AQI
29AQI
2026 Days Vs Air Quality
Cluj Napoca, Cluj, Romania
46%
123
40%
107
13%
35
1%
3
Total number of days with different AQI categories in last 272 days in 2026 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 46%
Health Risk Level:
Significant
In 2026, 46% of 272 days were within WHO’s safe air quality limits, and 54% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.
Annual Air Quality Insights
Cluj Napoca, Cluj, Romania
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
68AQI (US)
71AQI (US)
56AQI (US)
92AQI (US)
89AQI (US)
106AQI (US)
72AQI (US)
80AQI (US)
82AQI (US)
105AQI (US)
66AQI (US)
114AQI (US)
101AQI (US)
119AQI (US)
143AQI (US)
106AQI (US)
75AQI (US)
134AQI (US)
138AQI (US)
155AQI (US)
157AQI (US)
162AQI (US)
134AQI (US)
139AQI (US)
118AQI (US)
67AQI (US)
107AQI (US)
97AQI (US)
139AQI (US)
145AQI (US)
110AQI (US)
89AQI (US)
93AQI (US)
91AQI (US)
108AQI (US)
69AQI (US)
55AQI (US)
76AQI (US)
103AQI (US)
101AQI (US)
71AQI (US)
78AQI (US)
91AQI (US)
102AQI (US)
67AQI (US)
89AQI (US)
84AQI (US)
95AQI (US)
87AQI (US)
86AQI (US)
79AQI (US)
53AQI (US)
113AQI (US)
108AQI (US)
86AQI (US)
43AQI (US)
58AQI (US)
108AQI (US)
123AQI (US)
114AQI (US)
119AQI (US)
125AQI (US)
112AQI (US)
110AQI (US)
62AQI (US)
92AQI (US)
110AQI (US)
91AQI (US)
86AQI (US)
83AQI (US)
98AQI (US)
108AQI (US)
100AQI (US)
67AQI (US)
87AQI (US)
113AQI (US)
115AQI (US)
84AQI (US)
66AQI (US)
76AQI (US)
62AQI (US)
53AQI (US)
82AQI (US)
95AQI (US)
97AQI (US)
81AQI (US)
68AQI (US)
66AQI (US)
89AQI (US)
78AQI (US)
86AQI (US)
93AQI (US)
122AQI (US)
81AQI (US)
73AQI (US)
71AQI (US)
43AQI (US)
66AQI (US)
64AQI (US)
76AQI (US)
76AQI (US)
81AQI (US)
91AQI (US)
60AQI (US)
85AQI (US)
75AQI (US)
62AQI (US)
54AQI (US)
68AQI (US)
57AQI (US)
32AQI (US)
34AQI (US)
59AQI (US)
41AQI (US)
32AQI (US)
46AQI (US)
51AQI (US)
40AQI (US)
58AQI (US)
54AQI (US)
48AQI (US)
36AQI (US)
38AQI (US)
48AQI (US)
69AQI (US)
56AQI (US)
53AQI (US)
41AQI (US)
34AQI (US)
52AQI (US)
43AQI (US)
43AQI (US)
42AQI (US)
51AQI (US)
37AQI (US)
34AQI (US)
44AQI (US)
58AQI (US)
60AQI (US)
39AQI (US)
41AQI (US)
43AQI (US)
40AQI (US)
30AQI (US)
32AQI (US)
33AQI (US)
22AQI (US)
35AQI (US)
40AQI (US)
41AQI (US)
41AQI (US)
64AQI (US)
53AQI (US)
54AQI (US)
28AQI (US)
18AQI (US)
36AQI (US)
42AQI (US)
66AQI (US)
52AQI (US)
25AQI (US)
22AQI (US)
24AQI (US)
34AQI (US)
34AQI (US)
27AQI (US)
43AQI (US)
55AQI (US)
62AQI (US)
67AQI (US)
51AQI (US)
47AQI (US)
65AQI (US)
59AQI (US)
51AQI (US)
87AQI (US)
96AQI (US)
102AQI (US)
47AQI (US)
61AQI (US)
46AQI (US)
18AQI (US)
18AQI (US)
24AQI (US)
26AQI (US)
26AQI (US)
25AQI (US)
28AQI (US)
34AQI (US)
39AQI (US)
24AQI (US)
38AQI (US)
55AQI (US)
35AQI (US)
44AQI (US)
55AQI (US)
48AQI (US)
41AQI (US)
27AQI (US)
31AQI (US)
31AQI (US)
29AQI (US)
25AQI (US)
28AQI (US)
40AQI (US)
34AQI (US)
30AQI (US)
30AQI (US)
32AQI (US)
45AQI (US)
50AQI (US)
48AQI (US)
39AQI (US)
56AQI (US)
64AQI (US)
65AQI (US)
44AQI (US)
29AQI (US)
50AQI (US)
44AQI (US)
47AQI (US)
44AQI (US)
31AQI (US)
29AQI (US)
31AQI (US)
39AQI (US)
41AQI (US)
25AQI (US)
37AQI (US)
67AQI (US)
52AQI (US)
34AQI (US)
38AQI (US)
32AQI (US)
56AQI (US)
49AQI (US)
25AQI (US)
32AQI (US)
53AQI (US)
49AQI (US)
42AQI (US)
28AQI (US)
25AQI (US)
26AQI (US)
29AQI (US)
27AQI (US)
18AQI (US)
26AQI (US)
30AQI (US)
38AQI (US)
37AQI (US)
41AQI (US)
21AQI (US)
28AQI (US)
38AQI (US)
38AQI (US)
45AQI (US)
63AQI (US)
47AQI (US)
34AQI (US)
32AQI (US)
29AQI (US)
23AQI (US)
30AQI (US)
38AQI (US)
42AQI (US)
37AQI (US)
44AQI (US)
108AQI (US)
86AQI (US)
90AQI (US)
65AQI (US)
44AQI (US)
50AQI (US)
34AQI (US)
43AQI (US)
34AQI (US)
No. of days
202662AQI (US)
Highest AQI (US) recorded in
January108AQI (US)
Lowest AQI (US) recorded in
September34AQI (US)
202550AQI (US)
Highest AQI (US) recorded in
December81AQI (US)
Lowest AQI (US) recorded in
August30AQI (US)
202445AQI (US)
Highest AQI (US) recorded in
January75AQI (US)
Lowest AQI (US) recorded in
September16AQI (US)
202349AQI (US)
Highest AQI (US) recorded in
December70AQI (US)
Lowest AQI (US) recorded in
June32AQI (US)
202233AQI (US)
Highest AQI (US) recorded in
December82AQI (US)
Lowest AQI (US) recorded in
August14AQI (US)
202126AQI (US)
Highest AQI (US) recorded in
January34AQI (US)
Lowest AQI (US) recorded in
September19AQI (US)
202011AQI (US)
Highest AQI (US) recorded in
November18AQI (US)
Lowest AQI (US) recorded in
June6AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Cluj Napoca's annual 2026 AQI (US) (62) shows an average percentage change of 129.7% (worsened AQI (US)) compared to previous years: 2020 (11), 2021 (26), 2022 (33), 2023 (49), 2024 (45), 2025 (50).