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!

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

July Air Quality Analysis
Ha Long, Quang Ninh, Vietnam

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Jul. 1	40	47	183	18	18
Jul. 2	41	46	178	17	19
Jul. 3		43	178	20	21
Jul. 4		43	93	22	17
Jul. 5		41	39	17	16
Jul. 6		40	49	19	11
Jul. 7		41	47	18	13
Jul. 8		44	41	18	12
Jul. 9		43	47	17	12
Jul. 10		44	53	18	15
Jul. 11		43	49	17	5
Jul. 12		42	44		13
Jul. 13		44	33	23	5
Jul. 14		43	27	13	5
Jul. 15		43	37	9	4
Jul. 16		42	68	14	14
Jul. 17		41	48	13	9
Jul. 18		37	36	17	15
Jul. 19		39	39	13	22
Jul. 20		39	17	12	14
Jul. 21		39	16	10	15
Jul. 22		41	17	4	4
Jul. 23		36		11	12
Jul. 24		36		8	15
Jul. 25		30			13
Jul. 26		34			15
Jul. 27		35			22
Jul. 28		38	56		23
Jul. 29		35	110		15
Jul. 30		38	37		20
Jul. 31		33	18		23

AQI Trends: Highest and Lowest

Highest AQI recorded on

1st Jul 2023

183AQI

Lowest AQI recorded on

15th Jul 2021

4AQI

Same Day Analysis (2nd July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 41 of Good air quality, showing improvement over 2024 and 2023 on the same day.

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Ha Long, Quang Ninh, Vietnam

AQI

Day

Night

5 AM2nd Jul 2025

6 PM

4 AM3rd Jul 2025

Day time

Avg. Highest Time

5AM2nd Jul

47AQI

Avg. Lowest Time

8AM2nd Jul

28AQI

Night time

Avg. Highest Time

2AM3rd Jul

49AQI

Avg. Lowest Time

11PM2nd Jul

37AQI

In the last 24 hours,

Ha Long's AQI reached its highest point of 49 at 2 AM during the Night, while the lowest point, 28, was recorded at 8 AM during the Day between 2nd Jul and 3rd Jul 2025.

Day & Night AQI Trend : Jun - Jul 2025
Ha Long, Quang Ninh, Vietnam

JunJul

03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd

Day

Night

27°C26/30°C

28°C25/30°C

28°C26/32°C

29°C26/31°C

29°C26/32°C

29°C27/32°C

28°C26/32°C

29°C25/33°C

27°C26/29°C

28°C25/32°C

29°C26/34°C

29°C27/32°C

28°C27/31°C

28°C27/30°C

28°C26/30°C

27°C26/29°C

27°C26/30°C

28°C26/31°C

28°C25/32°C

27°C25/30°C

27°C26/30°C

28°C26/31°C

28°C26/30°C

27°C26/30°C

27°C25/29°C

5 AM

11 AM

6 PM

11 PM

4 AM

0°C0/0°C

Day time

Avg. Highest Time

5 AM - 6 AM

53AQI

2 hours / Day

60 hours / Month

Avg. Lowest Time

7 AM - 6 PM

49AQI

12 hours / Day

360 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 6 AM (Avg. 53), while the lowest AQI was between 7 AM to 6 PM (Avg. 49).

Night time

Avg. Highest Time

12 AM - 11 PM

54AQI

10 hours / Day

300 hours / Month

Avg. Lowest Time

12 AM - 11 PM

54AQI

10 hours / Day

300 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 54), while the lowest AQI was between 12 AM to 11 PM (Avg. 54).

2025 Days Vs Air Quality
Ha Long, Quang Ninh, Vietnam

2025

74%

135

16%

Total number of days with different AQI categories in last 184 days in 2025 (181 days remaining)

Good

16 Days

Moderate

135 Days

Poor

29 Days

Unhealthy

3 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 9%

Health Risk Level:

Extreme

In 2025, 9% of 184 days were within WHO’s safe air quality limits. The risk of health issues is Extreme, potentially causing respiratory problems, heart disease, skin issues, and stress, especially for children, the elderly, and those with pre-existing conditions.

Annual Air Quality Insights
Ha Long, Quang Ninh, Vietnam

AQI levels in 2025

AQI

PM2.5

PM10

SO2

NO2

Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

116AQI

88AQI

71AQI

57AQI

53AQI

41AQI

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202575AQI

135

Highest AQI recorded in

January

116AQI

Lowest AQI recorded in

July

41AQI

202445AQI

247

Highest AQI recorded in

December

90AQI

Lowest AQI recorded in

May

30AQI

202328AQI

317

Highest AQI recorded in

July

60AQI

Lowest AQI recorded in

January

15AQI

202222AQI

319

Highest AQI recorded in

May

30AQI

Lowest AQI recorded in

February

14AQI

202125AQI

326

Highest AQI recorded in

January

60AQI

Lowest AQI recorded in

April

0AQI

202026AQI

238

Highest AQI recorded in

April

49AQI

Lowest AQI recorded in

August

12AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

75AQI

Least Polluted Year Recorded

2022(Avg.)

22AQI

Ha Long's annual 2025 AQI (75) shows an average percentage change of 175.003% (worsened AQI) compared to previous years: 2020 (26), 2021 (25), 2022 (22), 2023 (28), 2024 (45).


5 AM	47
6 AM	46
7 AM	35
8 AM	28
9 AM	32
10 AM	32
11 AM	37
12 PM	40
1 PM	43
2 PM	40
3 PM	38
4 PM	39
5 PM	35
6 PM	37
7 PM	37
8 PM	37
9 PM	37
10 PM	37
11 PM	37
12 AM	45
1 AM	46
2 AM	49
3 AM	49
4 AM	49

Ha Long, Quang Ninh, Vietnam Historical Air Quality Analysis

July Air Quality AnalysisHa Long, Quang Ninh, Vietnam

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025Ha Long, Quang Ninh, Vietnam

Day & Night AQI Trend : Jun - Jul 2025Ha Long, Quang Ninh, Vietnam

2025 Days Vs Air Quality Ha Long, Quang Ninh, Vietnam

Annual Air Quality InsightsHa Long, Quang Ninh, Vietnam

AQI levels in 2025

No. of days

July Air Quality Analysis
Ha Long, Quang Ninh, Vietnam

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Ha Long, Quang Ninh, Vietnam

Day & Night AQI Trend : Jun - Jul 2025
Ha Long, Quang Ninh, Vietnam

2025 Days Vs Air Quality
Ha Long, Quang Ninh, Vietnam

Annual Air Quality Insights
Ha Long, Quang Ninh, Vietnam