Douliu, Yunlin, 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
Douliu, Yunlin, Taiwan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Sep. 1	50	56	47		53
Sep. 2	48	67	35	42	54
Sep. 3	52	74	44	33	50
Sep. 4	60	72	18	39	50
Sep. 5	59	61	29	52	54
Sep. 6	55	41	30	52	38
Sep. 7	46	39	33	45	45
Sep. 8	39	36	30	52	59
Sep. 9	40	33	22	82	60
Sep. 10	41	49	25	83	71
Sep. 11	42	60	44	33	94
Sep. 12	44	66	67	35	39
Sep. 13	45	66	63	48	32
Sep. 14	46	35	69	60	33
Sep. 15	49	43	69	79	44
Sep. 16	53	60	68	86	53
Sep. 17	53	73	78	80	75
Sep. 18	52	79	66	83	82
Sep. 19		50	69	76	81
Sep. 20		34	59	84	69
Sep. 21		28	72	64	48
Sep. 22		19	72	66	46
Sep. 23		29	62	68	50
Sep. 24		42	53	63	61
Sep. 25		37	60	60	73
Sep. 26		56	48	66	83
Sep. 27		69	59	65	70
Sep. 28		56	49	75	82
Sep. 29		61	57	74	80
Sep. 30		79	68	74	105

AQI Trends: Highest and Lowest

Highest AQI recorded on

30th Sep 2021

105AQI

Lowest AQI recorded on

4th Sep 2023

18AQI

Same Day Analysis (18th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 52 of Moderate air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Douliu, Yunlin, Taiwan

AQI

Day

Night

5 AM18th Sep 2025

6 PM

4 AM19th Sep 2025

Day time

Avg. Highest Time

8AM18th Sep

55AQI

Avg. Lowest Time

5PM18th Sep

44AQI

Night time

Avg. Highest Time

4AM19th Sep

54AQI

Avg. Lowest Time

11PM18th Sep

41AQI

In the last 24 hours,

Douliu's AQI reached its highest point of 55 at 8 AM during the Day, while the lowest point, 41, was recorded at 11 PM during the Night between 18th Sep and 19th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Douliu, Yunlin, Taiwan

AugSep

20th - 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 - 19th19th

Day

Night

29°C26/34°C

30°C26/35°C

30°C27/36°C

31°C27/36°C

30°C27/35°C

30°C26/36°C

29°C26/35°C

28°C26/32°C

30°C25/34°C

31°C27/36°C

30°C26/35°C

29°C27/32°C

29°C27/31°C

30°C27/34°C

30°C27/36°C

29°C27/35°C

29°C25/34°C

30°C27/34°C

30°C27/35°C

30°C26/35°C

30°C27/34°C

30°C27/33°C

29°C26/34°C

30°C26/35°C

30°C27/34°C

30°C26/35°C

28°C26/33°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

5 AM - 7 AM

48AQI

3 hours / Day

90 hours / Month

Avg. Lowest Time

8 AM - 6 PM

44AQI

11 hours / Day

330 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 AM (Avg. 48), while the lowest AQI was between 8 AM to 6 PM (Avg. 44).

Night time

Avg. Highest Time

12 AM - 4 AM

49AQI

5 hours / Day

150 hours / Month

Avg. Lowest Time

7 PM

46AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 4 AM (Avg. 49), while the lowest AQI was between 7 PM to 7 PM (Avg. 46).

2025 Days Vs Air Quality
Douliu, Yunlin, Taiwan

2025

45%

118

53%

139

Total number of days with different AQI categories in last 262 days in 2025 (103 days remaining)

Good

118 Days

Moderate

139 Days

Poor

4 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 45%

Health Risk Level:

Significant

In 2025, 45% of 262 days were within WHO’s safe air quality limits, and 55% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.

Annual Air Quality Insights
Douliu, Yunlin, 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.

74AQI

70AQI

67AQI

53AQI

35AQI

41AQI

43AQI

49AQI

No. of days

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

202556AQI

118

139

Highest AQI recorded in

January

74AQI

Lowest AQI recorded in

June

35AQI

202461AQI

135

211

Highest AQI recorded in

January

84AQI

Lowest AQI recorded in

July

31AQI

202364AQI

123

216

Highest AQI recorded in

April

85AQI

Lowest AQI recorded in

July

36AQI

202262AQI

113

186

Highest AQI recorded in

March

90AQI

Lowest AQI recorded in

June

33AQI

202168AQI

122

191

Highest AQI recorded in

February

107AQI

Lowest AQI recorded in

June

36AQI

202058AQI

111

143

Highest AQI recorded in

March

89AQI

Lowest AQI recorded in

June

29AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2021(Avg.)

68AQI

Least Polluted Year Recorded

2025(Avg.)

56AQI

Douliu's annual 2025 AQI (56) shows an average percentage change of -10.6% (improved AQI) compared to previous years: 2020 (58), 2021 (68), 2022 (62), 2023 (64), 2024 (61).


5 AM	52
6 AM	52
7 AM	52
8 AM	55
9 AM	53
10 AM	52
11 AM	54
12 PM	55
1 PM	53
2 PM	52
3 PM	52
4 PM	45
5 PM	44
6 PM	50
7 PM	45
8 PM	42
9 PM	44
10 PM	45
11 PM	41
12 AM	45
1 AM	53
2 AM	52
3 AM	53
4 AM	54

Douliu, Yunlin, Taiwan Historical Air Quality Analysis

September Air Quality AnalysisDouliu, Yunlin, Taiwan

Day & Night AQI Trend: 18th Sep - 19th Sep 2025Douliu, Yunlin, Taiwan

Day & Night AQI Trend : Aug - Sep 2025Douliu, Yunlin, Taiwan

2025 Days Vs Air Quality Douliu, Yunlin, Taiwan

Annual Air Quality InsightsDouliu, Yunlin, Taiwan

AQI levels in 2025

No. of days

September Air Quality Analysis
Douliu, Yunlin, Taiwan

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Douliu, Yunlin, Taiwan

Day & Night AQI Trend : Aug - Sep 2025
Douliu, Yunlin, Taiwan

2025 Days Vs Air Quality
Douliu, Yunlin, Taiwan

Annual Air Quality Insights
Douliu, Yunlin, Taiwan