Bacau, Bacu, 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
Bacau, Bacu, Romania
AQI Trends: Highest and Lowest
Same Day Analysis (29th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 39 of Good air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 28th Sep - 29th Sep 2026
Bacau, Bacu, Romania
6 AM28th Sep 2026
7 PM
5 AM29th Sep 2026
50AQI
40AQI
43AQI
21AQI
In the last 24 hours,
Bacau's AQI reached its highest point of 50 at 1 PM during the Day, while the lowest point, 21, was recorded at 2 AM during the Night between 28th Sep and 29th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Bacau, Bacu, Romania
24°C18/31°C
21°C18/26°C
22°C16/29°C
21°C15/28°C
21°C15/28°C
24°C16/34°C
17°C14/23°C
17°C11/24°C
19°C13/27°C
21°C13/29°C
22°C13/31°C
22°C14/30°C
19°C13/24°C
14°C11/16°C
15°C11/20°C
18°C13/22°C
18°C14/24°C
19°C13/27°C
19°C12/26°C
20°C15/25°C
20°C15/27°C
15°C11/22°C
12°C9/17°C
12°C8/16°C
13°C10/18°C
14°C9/21°C
15°C10/20°C
16°C13/21°C
15°C9/19°C
15°C10/21°C
40AQI
33AQI
39AQI
35AQI
2026 Days Vs Air Quality
Bacau, Bacu, Romania
80%
214
19%
50
2%
5
Total number of days with different AQI categories in last 272 days in 2026 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 80%
Health Risk Level:
Low
In 2026, 80% of 272 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Bacau, Bacu, Romania
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
55AQI (US)
46AQI (US)
58AQI (US)
49AQI (US)
66AQI (US)
68AQI (US)
78AQI (US)
61AQI (US)
55AQI (US)
74AQI (US)
74AQI (US)
56AQI (US)
70AQI (US)
96AQI (US)
114AQI (US)
102AQI (US)
101AQI (US)
92AQI (US)
96AQI (US)
114AQI (US)
116AQI (US)
70AQI (US)
46AQI (US)
54AQI (US)
54AQI (US)
40AQI (US)
66AQI (US)
60AQI (US)
51AQI (US)
46AQI (US)
44AQI (US)
52AQI (US)
51AQI (US)
69AQI (US)
80AQI (US)
64AQI (US)
22AQI (US)
42AQI (US)
83AQI (US)
70AQI (US)
55AQI (US)
62AQI (US)
72AQI (US)
58AQI (US)
50AQI (US)
42AQI (US)
42AQI (US)
60AQI (US)
43AQI (US)
72AQI (US)
89AQI (US)
59AQI (US)
60AQI (US)
42AQI (US)
47AQI (US)
27AQI (US)
18AQI (US)
62AQI (US)
66AQI (US)
66AQI (US)
58AQI (US)
59AQI (US)
54AQI (US)
50AQI (US)
40AQI (US)
38AQI (US)
42AQI (US)
40AQI (US)
38AQI (US)
38AQI (US)
41AQI (US)
48AQI (US)
53AQI (US)
51AQI (US)
58AQI (US)
60AQI (US)
48AQI (US)
32AQI (US)
34AQI (US)
38AQI (US)
36AQI (US)
40AQI (US)
46AQI (US)
52AQI (US)
41AQI (US)
43AQI (US)
35AQI (US)
32AQI (US)
34AQI (US)
42AQI (US)
40AQI (US)
34AQI (US)
47AQI (US)
25AQI (US)
36AQI (US)
48AQI (US)
24AQI (US)
20AQI (US)
27AQI (US)
34AQI (US)
34AQI (US)
38AQI (US)
34AQI (US)
26AQI (US)
38AQI (US)
40AQI (US)
28AQI (US)
22AQI (US)
24AQI (US)
20AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
28AQI (US)
22AQI (US)
26AQI (US)
20AQI (US)
22AQI (US)
27AQI (US)
26AQI (US)
24AQI (US)
29AQI (US)
24AQI (US)
25AQI (US)
22AQI (US)
28AQI (US)
30AQI (US)
31AQI (US)
26AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
42AQI (US)
51AQI (US)
38AQI (US)
35AQI (US)
45AQI (US)
59AQI (US)
62AQI (US)
40AQI (US)
42AQI (US)
42AQI (US)
36AQI (US)
24AQI (US)
22AQI (US)
19AQI (US)
19AQI (US)
25AQI (US)
27AQI (US)
26AQI (US)
20AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
30AQI (US)
16AQI (US)
28AQI (US)
24AQI (US)
30AQI (US)
28AQI (US)
17AQI (US)
20AQI (US)
18AQI (US)
22AQI (US)
23AQI (US)
23AQI (US)
23AQI (US)
28AQI (US)
27AQI (US)
25AQI (US)
27AQI (US)
28AQI (US)
21AQI (US)
39AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
34AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
19AQI (US)
18AQI (US)
21AQI (US)
17AQI (US)
22AQI (US)
22AQI (US)
20AQI (US)
25AQI (US)
24AQI (US)
34AQI (US)
48AQI (US)
40AQI (US)
37AQI (US)
38AQI (US)
35AQI (US)
37AQI (US)
35AQI (US)
36AQI (US)
29AQI (US)
31AQI (US)
32AQI (US)
30AQI (US)
36AQI (US)
34AQI (US)
30AQI (US)
31AQI (US)
34AQI (US)
34AQI (US)
38AQI (US)
32AQI (US)
34AQI (US)
36AQI (US)
40AQI (US)
40AQI (US)
36AQI (US)
34AQI (US)
36AQI (US)
32AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
36AQI (US)
34AQI (US)
33AQI (US)
38AQI (US)
32AQI (US)
38AQI (US)
37AQI (US)
38AQI (US)
30AQI (US)
34AQI (US)
36AQI (US)
37AQI (US)
40AQI (US)
38AQI (US)
38AQI (US)
34AQI (US)
37AQI (US)
40AQI (US)
46AQI (US)
40AQI (US)
39AQI (US)
38AQI (US)
28AQI (US)
26AQI (US)
29AQI (US)
38AQI (US)
34AQI (US)
35AQI (US)
44AQI (US)
34AQI (US)
35AQI (US)
35AQI (US)
35AQI (US)
33AQI (US)
38AQI (US)
36AQI (US)
37AQI (US)
38AQI (US)
28AQI (US)
28AQI (US)
31AQI (US)
44AQI (US)
42AQI (US)
42AQI (US)
44AQI (US)
39AQI (US)
70AQI (US)
56AQI (US)
45AQI (US)
30AQI (US)
33AQI (US)
25AQI (US)
30AQI (US)
36AQI (US)
36AQI (US)
No. of days
202640AQI (US)
Highest AQI (US) recorded in
January70AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202550AQI (US)
Highest AQI (US) recorded in
December82AQI (US)
Lowest AQI (US) recorded in
July27AQI (US)
202432AQI (US)
Highest AQI (US) recorded in
November61AQI (US)
Lowest AQI (US) recorded in
March15AQI (US)
202322AQI (US)
Highest AQI (US) recorded in
May30AQI (US)
Lowest AQI (US) recorded in
November12AQI (US)
202227AQI (US)
Highest AQI (US) recorded in
December33AQI (US)
Lowest AQI (US) recorded in
September19AQI (US)
202124AQI (US)
Highest AQI (US) recorded in
October31AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202025AQI (US)
Highest AQI (US) recorded in
March35AQI (US)
Lowest AQI (US) recorded in
December18AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Bacau's annual 2026 AQI (US) (40) shows an average percentage change of 43.6% (worsened AQI (US)) compared to previous years: 2020 (25), 2021 (24), 2022 (27), 2023 (22), 2024 (32), 2025 (50).