Son Tay, Ha Noi, 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
Son Tay, Ha Noi, Vietnam

2021

2024

2025

AQI

Days

Days	2025	2024	2021
Jul. 1	49	51
Jul. 2		48
Jul. 3		51
Jul. 4		51
Jul. 5		53	3
Jul. 6		52
Jul. 7		52
Jul. 8		52
Jul. 9		51
Jul. 10		51
Jul. 11		51	4
Jul. 12		50	5
Jul. 13		49	5
Jul. 14		48	6
Jul. 15		47	5
Jul. 16		43	6
Jul. 17		44	13
Jul. 18		42	9
Jul. 19		44	7
Jul. 20		41	42
Jul. 21		43	5
Jul. 22		40
Jul. 23		44
Jul. 24		41
Jul. 25		40
Jul. 26		41
Jul. 27		41
Jul. 28		43
Jul. 29		42
Jul. 30		42
Jul. 31		42

AQI Trends: Highest and Lowest

Highest AQI recorded on

5th Jul 2024

53AQI

Lowest AQI recorded on

5th Jul 2021

3AQI

Same Day Analysis (1st July ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 49 of Good air quality, showing improvement over 2024 on the same day.

Day & Night AQI Trend: 1st Jul - 2nd Jul 2025
Son Tay, Ha Noi, Vietnam

AQI

Day

Night

5 AM1st Jul 2025

6 PM

4 AM2nd Jul 2025

Day time

Avg. Highest Time

6AM1st Jul

55AQI

Avg. Lowest Time

5PM1st Jul

34AQI

Night time

Avg. Highest Time

11PM1st Jul

54AQI

Avg. Lowest Time

7PM1st Jul

46AQI

In the last 24 hours,

Son Tay's AQI reached its highest point of 55 at 6 AM during the Day, while the lowest point, 34, was recorded at 5 PM during the Day between 1st Jul and 2nd Jul 2025.

Day & Night AQI Trend : Jun - Jul 2025
Son Tay, Ha Noi, Vietnam

JunJul

02nd - 03rd03rd - 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

Day

Night

31°C24/39°C

29°C25/33°C

27°C24/31°C

29°C24/35°C

29°C25/35°C

28°C25/31°C

25°C23/26°C

28°C24/33°C

27°C24/31°C

29°C24/33°C

30°C25/36°C

31°C27/37°C

28°C26/30°C

29°C25/35°C

29°C26/33°C

30°C26/34°C

28°C26/31°C

26°C25/28°C

27°C24/31°C

28°C25/32°C

29°C25/34°C

29°C25/33°C

28°C25/32°C

27°C25/30°C

27°C24/30°C

27°C25/32°C

27°C25/30°C

26°C25/31°C

5 AM

11 AM

6 PM

11 PM

4 AM

0°C0/0°C

Day time

Avg. Highest Time

5 AM - 6 PM

56AQI

14 hours / Day

420 hours / Month

Avg. Lowest Time

5 AM - 5 PM

56AQI

13 hours / Day

390 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 6 PM (Avg. 56), while the lowest AQI was between 5 AM to 5 PM (Avg. 56).

Night time

Avg. Highest Time

12 AM - 11 PM

61AQI

10 hours / Day

300 hours / Month

Avg. Lowest Time

1 AM - 4 AM

58AQI

4 hours / Day

120 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 61), while the lowest AQI was between 1 AM to 4 AM (Avg. 58).

2025 Days Vs Air Quality
Son Tay, Ha Noi, Vietnam

2025

0.5%

65%

118

27%

Total number of days with different AQI categories in last 183 days in 2025 (182 days remaining)

Good

1 Days

Moderate

118 Days

Poor

50 Days

Unhealthy

13 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 0.55%

Health Risk Level:

Extreme

In 2025, 0.55% of 183 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
Son Tay, Ha Noi, 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.

133AQI

108AQI

101AQI

94AQI

65AQI

59AQI

49AQI

No. of days

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

202593AQI

118

Highest AQI recorded in

January

133AQI

Lowest AQI recorded in

July

49AQI

202471AQI

122

Highest AQI recorded in

December

115AQI

Lowest AQI recorded in

April

2AQI

202334AQI

Highest AQI recorded in

November

43AQI

Lowest AQI recorded in

December

33AQI

20219AQI

Highest AQI recorded in

July

9AQI

Lowest AQI recorded in

May

7AQI

Most & Least Polluted Years Over the Last 4 Years

Most Polluted Year Recorded

2025(Avg.)

93AQI

Least Polluted Year Recorded

2021(Avg.)

9AQI

Son Tay's annual 2025 AQI (93) shows an average percentage change of 388.4% (worsened AQI) compared to previous years: 2021 (9), 2023 (34), 2024 (71).


5 AM	46
6 AM	55
7 AM	43
8 AM	45
9 AM	41
10 AM	42
11 AM	47
12 PM	50
1 PM	44
2 PM	44
3 PM	41
4 PM	36
5 PM	34
6 PM	38
7 PM	46
8 PM	47
9 PM	50
10 PM	48
11 PM	54
12 AM	52
1 AM	54
2 AM	53
3 AM	53
4 AM	53

Son Tay, Ha Noi, Vietnam Historical Air Quality Analysis

July Air Quality AnalysisSon Tay, Ha Noi, Vietnam

Day & Night AQI Trend: 1st Jul - 2nd Jul 2025Son Tay, Ha Noi, Vietnam

Day & Night AQI Trend : Jun - Jul 2025Son Tay, Ha Noi, Vietnam

2025 Days Vs Air Quality Son Tay, Ha Noi, Vietnam

Annual Air Quality InsightsSon Tay, Ha Noi, Vietnam

AQI levels in 2025

No. of days

July Air Quality Analysis
Son Tay, Ha Noi, Vietnam

Day & Night AQI Trend: 1st Jul - 2nd Jul 2025
Son Tay, Ha Noi, Vietnam

Day & Night AQI Trend : Jun - Jul 2025
Son Tay, Ha Noi, Vietnam

2025 Days Vs Air Quality
Son Tay, Ha Noi, Vietnam

Annual Air Quality Insights
Son Tay, Ha Noi, Vietnam