Ansan, Gyeonggi, South Korea 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
Ansan, Gyeonggi, South Korea

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Jul. 1	47	54	61	30	102
Jul. 2	51	47	48	51	71
Jul. 3		57	74	78	37
Jul. 4		81	73	70	27
Jul. 5		49	60	93	46
Jul. 6		56	84	74	91
Jul. 7		49	72	40	55
Jul. 8		32	35	56	41
Jul. 9		36	49	58	34
Jul. 10		35	74	84	56
Jul. 11		78	50	57	54
Jul. 12		84	53	39	66
Jul. 13		104	52	52	60
Jul. 14		63	43	28	35
Jul. 15		38	49	49	34
Jul. 16		39	53	60	63
Jul. 17		23	48	53	46
Jul. 18		27	33	57	39
Jul. 19		49	63	69	32
Jul. 20		36	93	71	57
Jul. 21		40	113	38	64
Jul. 22		24	69	59	68
Jul. 23		21	21	77	80
Jul. 24		25	40	56	86
Jul. 25		33	37		65
Jul. 26		38	30	75	51
Jul. 27		33	44		67
Jul. 28		27	68		79
Jul. 29		27	66		80
Jul. 30		37	41		52
Jul. 31		28	70		46

AQI Trends: Highest and Lowest

Highest AQI recorded on

21st Jul 2023

113AQI

Lowest AQI recorded on

23rd Jul 2023

21AQI

Same Day Analysis (2nd July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 51 of Moderate air quality, showing improvement over 2022 and 2021 on the same day.

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Ansan, Gyeonggi, South Korea

AQI

Day

Night

5 AM2nd Jul 2025

7 PM

4 AM3rd Jul 2025

Day time

Avg. Highest Time

5AM2nd Jul

55AQI

Avg. Lowest Time

12PM2nd Jul

35AQI

Night time

Avg. Highest Time

3AM3rd Jul

55AQI

Avg. Lowest Time

1AM3rd Jul

47AQI

In the last 24 hours,

Ansan's AQI reached its highest point of 55 at 5 AM during the Day, while the lowest point, 35, was recorded at 12 PM during the Day between 2nd Jul and 3rd Jul 2025.

Day & Night AQI Trend : Jun - Jul 2025
Ansan, Gyeonggi, South Korea

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

20°C16/25°C

19°C16/23°C

21°C16/26°C

23°C19/29°C

23°C20/27°C

23°C20/28°C

21°C18/23°C

22°C17/26°C

24°C19/30°C

22°C20/25°C

23°C19/28°C

24°C20/29°C

22°C20/25°C

23°C19/27°C

24°C19/28°C

26°C22/32°C

22°C20/23°C

20°C18/23°C

22°C19/27°C

25°C20/29°C

25°C22/28°C

20°C19/22°C

22°C19/25°C

24°C20/28°C

24°C22/28°C

25°C22/29°C

26°C23/29°C

25°C23/29°C

5 AM

12 PM

7 PM

12 AM

4 AM

0°C0/0°C

Day time

Avg. Highest Time

5 AM - 8 AM

65AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

9 AM - 7 PM

59AQI

11 hours / Day

330 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 AM (Avg. 65), while the lowest AQI was between 9 AM to 7 PM (Avg. 59).

Night time

Avg. Highest Time

12 AM - 4 AM

65AQI

5 hours / Day

150 hours / Month

Avg. Lowest Time

8 PM - 11 PM

61AQI

4 hours / Day

120 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 4 AM (Avg. 65), while the lowest AQI was between 8 PM to 11 PM (Avg. 61).

2025 Days Vs Air Quality
Ansan, Gyeonggi, South Korea

2025

15%

77%

140

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

Good

27 Days

Moderate

140 Days

Poor

16 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 15%

Health Risk Level:

Extreme

In 2025, 15% 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
Ansan, Gyeonggi, South Korea

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.

76AQI

61AQI

84AQI

66AQI

63AQI

65AQI

49AQI

No. of days

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

202569AQI

140

Highest AQI recorded in

March

84AQI

Lowest AQI recorded in

July

49AQI

202462AQI

129

215

Highest AQI recorded in

January

78AQI

Lowest AQI recorded in

September

42AQI

202368AQI

105

216

Highest AQI recorded in

March

93AQI

Lowest AQI recorded in

September

49AQI

202268AQI

100

180

Highest AQI recorded in

January

87AQI

Lowest AQI recorded in

August

34AQI

202169AQI

123

195

Highest AQI recorded in

March

99AQI

Lowest AQI recorded in

September

40AQI

202061AQI

104

141

Highest AQI recorded in

December

79AQI

Lowest AQI recorded in

September

44AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

69AQI

Least Polluted Year Recorded

2020(Avg.)

61AQI

Ansan's annual 2025 AQI (69) shows an average percentage change of 6.2% (worsened AQI) compared to previous years: 2020 (61), 2021 (69), 2022 (68), 2023 (68), 2024 (62).


5 AM	55
6 AM	54
7 AM	54
8 AM	55
9 AM	40
10 AM	40
11 AM	37
12 PM	35
1 PM	43
2 PM	44
3 PM	43
4 PM	43
5 PM	45
6 PM	46
7 PM	47
8 PM	47
9 PM	47
10 PM	47
11 PM	47
12 AM	47
1 AM	47
2 AM	53
3 AM	55
4 AM	55

Ansan, Gyeonggi, South Korea Historical Air Quality Analysis

July Air Quality AnalysisAnsan, Gyeonggi, South Korea

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025Ansan, Gyeonggi, South Korea

Day & Night AQI Trend : Jun - Jul 2025Ansan, Gyeonggi, South Korea

2025 Days Vs Air Quality Ansan, Gyeonggi, South Korea

Annual Air Quality InsightsAnsan, Gyeonggi, South Korea

AQI levels in 2025

No. of days

July Air Quality Analysis
Ansan, Gyeonggi, South Korea

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Ansan, Gyeonggi, South Korea

Day & Night AQI Trend : Jun - Jul 2025
Ansan, Gyeonggi, South Korea

2025 Days Vs Air Quality
Ansan, Gyeonggi, South Korea

Annual Air Quality Insights
Ansan, Gyeonggi, South Korea