Matsu, Nangan, Lienchiang, Taiwan 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+

September Air Quality Analysis
Matsu, Nangan, Lienchiang, Taiwan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	49	64	52		22
Sep. 2	51	46	48	63	41
Sep. 3	55	47	31	32	40
Sep. 4	58	50	30	31	39
Sep. 5	55	44	29	51	37
Sep. 6	53	24	40	65	29
Sep. 7	57	28	52	65	43
Sep. 8	51	22	46	64	44
Sep. 9	50	44	46	96	33
Sep. 10	54	81	46	89	38
Sep. 11	55	90	43	72	23
Sep. 12	55	54	31	62	23
Sep. 13	55	23	39	55	52
Sep. 14	55	26	48	37	67
Sep. 15	56	51	27	46	49
Sep. 16	46	38	54	60	45
Sep. 17		35	78	66	48
Sep. 18		42	29	73	55
Sep. 19		32	20	82	54
Sep. 20		47	30	72	48
Sep. 21		38	38	61	49
Sep. 22		31	27	44	63
Sep. 23		37	39	66	48
Sep. 24		32	45	63	40
Sep. 25		32	36	51	54
Sep. 26		38	41	52	57
Sep. 27		40	42	51	56
Sep. 28		52	46	54	61
Sep. 29		45	42	52	70
Sep. 30		22	39	55	54

AQI Trends: Highest and Lowest

Highest AQI recorded on

9th Sep 2022

96AQI

Lowest AQI recorded on

19th Sep 2023

20AQI

Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 46 of Good air quality, showing improvement over 2023 and 2022 on the same day.

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Matsu, Nangan, Lienchiang, Taiwan

AQI

Day

Night

5 AM17th Sep 2025

6 PM

4 AM18th Sep 2025

Day time

Avg. Highest Time

6AM17th Sep

55AQI

Avg. Lowest Time

9AM17th Sep

28AQI

Night time

Avg. Highest Time

1AM18th Sep

56AQI

Avg. Lowest Time

7PM17th Sep

42AQI

In the last 24 hours,

Matsu's AQI reached its highest point of 56 at 1 AM during the Night, while the lowest point, 28, was recorded at 9 AM during the Day between 17th Sep and 18th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Matsu, Nangan, Lienchiang, Taiwan

AugSep

19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th

Day

Night

28°C27/28°C

28°C27/29°C

28°C28/29°C

28°C27/29°C

28°C28/29°C

28°C27/29°C

28°C27/28°C

28°C27/29°C

28°C27/28°C

28°C28/29°C

28°C27/29°C

29°C28/30°C

28°C28/29°C

28°C27/29°C

29°C28/30°C

28°C28/29°C

28°C28/28°C

28°C28/29°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

5 AM - 7 AM

52AQI

3 hours / Day

90 hours / Month

Avg. Lowest Time

3 PM - 6 PM

47AQI

4 hours / Day

120 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 AM (Avg. 52), while the lowest AQI was between 3 PM to 6 PM (Avg. 47).

Night time

Avg. Highest Time

1 AM - 4 AM

53AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

7 PM - 11 PM

50AQI

5 hours / Day

150 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 1 AM to 4 AM (Avg. 53), while the lowest AQI was between 7 PM to 11 PM (Avg. 50).

2025 Days Vs Air Quality
Matsu, Nangan, Lienchiang, Taiwan

2025

29%

67%

174

Total number of days with different AQI categories in last 261 days in 2025 (104 days remaining)

Good

74 Days

Moderate

174 Days

Poor

11 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 29%

Health Risk Level:

Very high

In 2025, 29% of 261 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
Matsu, Nangan, Lienchiang, Taiwan

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.

84AQI

83AQI

71AQI

74AQI

65AQI

48AQI

46AQI

48AQI

53AQI

No. of days

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

202564AQI

174

Highest AQI recorded in

January

84AQI

Lowest AQI recorded in

July

46AQI

202461AQI

140

200

Highest AQI recorded in

January

92AQI

Lowest AQI recorded in

September

42AQI

202356AQI

155

188

Highest AQI recorded in

April

80AQI

Lowest AQI recorded in

February

25AQI

202259AQI

133

173

Highest AQI recorded in

January

81AQI

Lowest AQI recorded in

June

36AQI

202160AQI

132

210

Highest AQI recorded in

January

81AQI

Lowest AQI recorded in

August

35AQI

202056AQI

114

138

Highest AQI recorded in

April

82AQI

Lowest AQI recorded in

July

38AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

64AQI

Least Polluted Year Recorded

2023(Avg.)

56AQI

Matsu's annual 2025 AQI (64) shows an average percentage change of 9.5% (worsened AQI) compared to previous years: 2020 (56), 2021 (60), 2022 (59), 2023 (56), 2024 (61).


5 AM	54
6 AM	55
7 AM	54
8 AM	34
9 AM	28
10 AM	34
11 AM	33
12 PM	37
1 PM	45
2 PM	40
3 PM	38
4 PM	36
5 PM	35
6 PM	33
7 PM	42
8 PM	52
9 PM	47
10 PM	48
11 PM	45
12 AM	50
1 AM	56
2 AM	56
3 AM	54
4 AM	53

Matsu, Nangan, Lienchiang, Taiwan Historical Air Quality Analysis

September Air Quality AnalysisMatsu, Nangan, Lienchiang, Taiwan

Day & Night AQI Trend: 17th Sep - 18th Sep 2025Matsu, Nangan, Lienchiang, Taiwan

Day & Night AQI Trend : Aug - Sep 2025Matsu, Nangan, Lienchiang, Taiwan

2025 Days Vs Air Quality Matsu, Nangan, Lienchiang, Taiwan

Annual Air Quality InsightsMatsu, Nangan, Lienchiang, Taiwan

AQI levels in 2025

No. of days

September Air Quality Analysis
Matsu, Nangan, Lienchiang, Taiwan

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Matsu, Nangan, Lienchiang, Taiwan

Day & Night AQI Trend : Aug - Sep 2025
Matsu, Nangan, Lienchiang, Taiwan

2025 Days Vs Air Quality
Matsu, Nangan, Lienchiang, Taiwan

Annual Air Quality Insights
Matsu, Nangan, Lienchiang, Taiwan