Ha Long, Quang Ninh, Vietnam 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
Ha Long, Quang Ninh, Vietnam
AQI Trends: Highest and Lowest
Same Day Analysis (6th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 83 of Moderate air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 7th Oct - 8th Oct 2025
Ha Long, Quang Ninh, Vietnam
5 AM7th Oct 2025
5 PM
4 AM8th Oct 2025
AQI
AQI
86AQI
67AQI
In the last 24 hours,
Ha Long's AQI reached its highest point of 86 at 1 AM during the Night, while the lowest point, undefined, was recorded at 5 PM during the Night between 7th Oct and 8th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Ha Long, Quang Ninh, Vietnam
29°C26/34°C
28°C27/29°C
28°C27/31°C
27°C26/29°C
28°C26/31°C
28°C25/31°C
27°C25/31°C
28°C26/30°C
28°C25/31°C
26°C25/29°C
27°C24/29°C
28°C25/32°C
29°C25/34°C
28°C25/31°C
27°C25/29°C
27°C24/30°C
28°C24/32°C
24°C23/24°C
26°C24/28°C
28°C25/32°C
25°C24/29°C
26°C25/26°C
26°C25/27°C
26°C24/29°C
27°C24/30°C
27°C24/30°C
27°C25/30°C
28°C24/34°C
25°C24/26°C
--°C/°C
--°C/°C
50AQI
41AQI
52AQI
44AQI
2025 Days Vs Air Quality
Ha Long, Quang Ninh, Vietnam
24%
68
64%
179
10%
29
1%
3
Total number of days with different AQI categories in last 280 days in 2025 (85 days remaining)
Under WHO’s Safe Air Quality Limits: 24%
Health Risk Level:
Very high
In 2025, 24% of 280 days were within WHO’s safe air quality limits. The risk of health issues is Very high, including respiratory issues, heart disease, and stress, particularly affecting vulnerable groups.
Annual Air Quality Insights
Ha Long, Quang Ninh, Vietnam
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
136AQI
134AQI
110AQI
107AQI
119AQI
127AQI
115AQI
116AQI
128AQI
88AQI
100AQI
101AQI
119AQI
132AQI
128AQI
135AQI
145AQI
155AQI
157AQI
173AQI
135AQI
122AQI
110AQI
106AQI
88AQI
61AQI
80AQI
76AQI
118AQI
88AQI
89AQI
79AQI
67AQI
54AQI
64AQI
94AQI
78AQI
59AQI
66AQI
81AQI
126AQI
131AQI
136AQI
121AQI
112AQI
116AQI
73AQI
98AQI
65AQI
82AQI
78AQI
90AQI
92AQI
65AQI
72AQI
91AQI
74AQI
118AQI
73AQI
92AQI
73AQI
71AQI
72AQI
75AQI
65AQI
68AQI
87AQI
99AQI
116AQI
85AQI
82AQI
69AQI
64AQI
62AQI
54AQI
75AQI
72AQI
76AQI
75AQI
64AQI
66AQI
59AQI
62AQI
64AQI
66AQI
73AQI
70AQI
52AQI
41AQI
43AQI
51AQI
58AQI
64AQI
116AQI
79AQI
78AQI
77AQI
82AQI
75AQI
73AQI
70AQI
75AQI
73AQI
78AQI
79AQI
82AQI
76AQI
76AQI
71AQI
65AQI
67AQI
67AQI
62AQI
62AQI
56AQI
59AQI
56AQI
56AQI
75AQI
64AQI
58AQI
62AQI
60AQI
65AQI
68AQI
62AQI
61AQI
61AQI
61AQI
61AQI
55AQI
62AQI
59AQI
58AQI
55AQI
57AQI
54AQI
54AQI
53AQI
53AQI
56AQI
53AQI
49AQI
49AQI
53AQI
58AQI
59AQI
59AQI
54AQI
53AQI
51AQI
49AQI
50AQI
50AQI
51AQI
53AQI
51AQI
50AQI
51AQI
52AQI
52AQI
53AQI
50AQI
49AQI
52AQI
55AQI
55AQI
55AQI
55AQI
60AQI
61AQI
57AQI
55AQI
56AQI
58AQI
53AQI
52AQI
48AQI
49AQI
44AQI
50AQI
40AQI
40AQI
42AQI
54AQI
55AQI
53AQI
56AQI
54AQI
62AQI
53AQI
52AQI
53AQI
59AQI
61AQI
59AQI
55AQI
54AQI
55AQI
61AQI
53AQI
46AQI
43AQI
42AQI
40AQI
47AQI
51AQI
52AQI
51AQI
60AQI
57AQI
55AQI
53AQI
54AQI
56AQI
57AQI
55AQI
53AQI
55AQI
54AQI
58AQI
57AQI
52AQI
50AQI
50AQI
53AQI
40AQI
38AQI
35AQI
33AQI
35AQI
41AQI
40AQI
41AQI
41AQI
42AQI
35AQI
35AQI
40AQI
46AQI
47AQI
42AQI
41AQI
41AQI
42AQI
39AQI
35AQI
39AQI
38AQI
49AQI
54AQI
43AQI
46AQI
41AQI
39AQI
37AQI
38AQI
38AQI
40AQI
38AQI
32AQI
38AQI
50AQI
54AQI
50AQI
55AQI
48AQI
30AQI
20AQI
19AQI
21AQI
40AQI
48AQI
67AQI
77AQI
69AQI
72AQI
79AQI
83AQI
116AQI
88AQI
71AQI
71AQI
57AQI
53AQI
52AQI
46AQI
40AQI
75AQI
No. of days
202566AQI
Highest AQI recorded in
January116AQI
Lowest AQI recorded in
September40AQI
202445AQI
Highest AQI recorded in
December90AQI
Lowest AQI recorded in
May30AQI
202328AQI
Highest AQI recorded in
July60AQI
Lowest AQI recorded in
January15AQI
202222AQI
Highest AQI recorded in
May30AQI
Lowest AQI recorded in
February14AQI
202125AQI
Highest AQI recorded in
January60AQI
Lowest AQI recorded in
April0AQI
202026AQI
Highest AQI recorded in
April49AQI
Lowest AQI recorded in
August12AQI
Most & Least Polluted Years Over the Last 6 Years
Ha Long's annual 2025 AQI (66) shows an average percentage change of 140.6% (worsened AQI) compared to previous years: 2020 (26), 2021 (25), 2022 (22), 2023 (28), 2024 (45).