Dongpu Reservoir, Hefei, Anhui, China 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
Dongpu Reservoir, Hefei, Anhui, China

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Jul. 1	49	36	57		87
Jul. 2	50	39	68		50
Jul. 3		51	50		29
Jul. 4		44	35		39
Jul. 5		53	45		30
Jul. 6		51	56		52
Jul. 7		53	47	36	57
Jul. 8		51	32	27	33
Jul. 9		58	34	32	38
Jul. 10		52	44	40	60
Jul. 11		67	64	66	71
Jul. 12		65	63		54
Jul. 13		48	68	72	46
Jul. 14		37	51	64	59
Jul. 15		49	47	64	62
Jul. 16		63	71	65	50
Jul. 17		54	54	58	33
Jul. 18		54	46	76	38
Jul. 19		57	56	68	59
Jul. 20		44	30	42	61
Jul. 21		50	38		52
Jul. 22		50	30	50	47
Jul. 23		62	36	40	42
Jul. 24		66	48	45	32
Jul. 25		49	67		32
Jul. 26		55	63		26
Jul. 27		35	46		15
Jul. 28		31	23		15
Jul. 29		31	21		30
Jul. 30		35	25		52
Jul. 31		45	32		76

AQI Trends: Highest and Lowest

Highest AQI recorded on

1st Jul 2021

87AQI

Lowest AQI recorded on

27th Jul 2021

15AQI

Same Day Analysis (2nd July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 50 of Good air quality, showing improvement over 2023 and 2021 on the same day.

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Dongpu Reservoir, Hefei, Anhui, China

AQI

Day

Night

5 AM2nd Jul 2025

7 PM

4 AM3rd Jul 2025

Day time

Avg. Highest Time

5AM2nd Jul

54AQI

Avg. Lowest Time

3PM2nd Jul

37AQI

Night time

Avg. Highest Time

2AM3rd Jul

53AQI

Avg. Lowest Time

12AM3rd Jul

46AQI

In the last 24 hours,

Dongpu Reservoir's AQI reached its highest point of 54 at 5 AM during the Day, while the lowest point, 37, was recorded at 3 PM during the Day between 2nd Jul and 3rd Jul 2025.

Day & Night AQI Trend : Jun - Jul 2025
Dongpu Reservoir, Hefei, Anhui, China

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

23°C17/28°C

26°C21/32°C

28°C23/33°C

28°C24/33°C

26°C24/28°C

25°C22/30°C

24°C22/28°C

23°C21/23°C

24°C21/29°C

23°C21/26°C

27°C22/32°C

28°C23/34°C

27°C24/32°C

27°C21/34°C

29°C24/35°C

29°C27/33°C

25°C24/26°C

22°C20/23°C

22°C20/24°C

21°C20/23°C

23°C20/26°C

25°C21/29°C

27°C24/32°C

24°C23/27°C

25°C23/28°C

26°C24/30°C

29°C24/33°C

30°C26/34°C

31°C27/36°C

5 AM

12 PM

7 PM

12 AM

4 AM

0°C0/0°C

Day time

Avg. Highest Time

5 AM - 7 PM

58AQI

15 hours / Day

450 hours / Month

Avg. Lowest Time

5 AM - 7 PM

58AQI

15 hours / Day

450 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 PM (Avg. 58), while the lowest AQI was between 5 AM to 7 PM (Avg. 58).

Night time

Avg. Highest Time

12 AM - 11 PM

59AQI

9 hours / Day

270 hours / Month

Avg. Lowest Time

12 AM - 11 PM

59AQI

9 hours / Day

270 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 59), while the lowest AQI was between 12 AM to 11 PM (Avg. 59).

2025 Days Vs Air Quality
Dongpu Reservoir, Hefei, Anhui, China

2025

48%

38%

0.5%

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

Good

11 Days

Moderate

88 Days

Poor

70 Days

Unhealthy

13 Days

Severe

0 Days

Hazardous

1 Days

Under WHO’s Safe Air Quality Limits: 6%

Health Risk Level:

Extreme

In 2025, 6% 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
Dongpu Reservoir, Hefei, Anhui, China

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.

131AQI

117AQI

106AQI

103AQI

91AQI

59AQI

50AQI

No. of days

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

2025101AQI

Highest AQI recorded in

January

131AQI

Lowest AQI recorded in

July

50AQI

202487AQI

165

Highest AQI recorded in

December

129AQI

Lowest AQI recorded in

July

50AQI

202384AQI

199

Highest AQI recorded in

December

114AQI

Lowest AQI recorded in

July

47AQI

202282AQI

183

Highest AQI recorded in

January

129AQI

Lowest AQI recorded in

August

45AQI

202187AQI

155

Highest AQI recorded in

January

120AQI

Lowest AQI recorded in

July

46AQI

202083AQI

167

Highest AQI recorded in

December

135AQI

Lowest AQI recorded in

June

60AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2025(Avg.)

101AQI

Least Polluted Year Recorded

2022(Avg.)

82AQI

Dongpu Reservoir's annual 2025 AQI (101) shows an average percentage change of 18.9% (worsened AQI) compared to previous years: 2020 (83), 2021 (87), 2022 (82), 2023 (84), 2024 (87).


5 AM	54
6 AM	54
7 AM	54
8 AM	51
9 AM	44
10 AM	44
11 AM	50
12 PM	47
1 PM	48
2 PM	43
3 PM	37
4 PM	43
5 PM	46
6 PM	47
7 PM	48
8 PM	46
9 PM	46
10 PM	46
11 PM	46
12 AM	46
1 AM	52
2 AM	53
3 AM	53
4 AM	53

Dongpu Reservoir, Hefei, Anhui, China Historical Air Quality Analysis

July Air Quality AnalysisDongpu Reservoir, Hefei, Anhui, China

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025Dongpu Reservoir, Hefei, Anhui, China

Day & Night AQI Trend : Jun - Jul 2025Dongpu Reservoir, Hefei, Anhui, China

2025 Days Vs Air Quality Dongpu Reservoir, Hefei, Anhui, China

Annual Air Quality InsightsDongpu Reservoir, Hefei, Anhui, China

AQI levels in 2025

No. of days

July Air Quality Analysis
Dongpu Reservoir, Hefei, Anhui, China

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Dongpu Reservoir, Hefei, Anhui, China

Day & Night AQI Trend : Jun - Jul 2025
Dongpu Reservoir, Hefei, Anhui, China

2025 Days Vs Air Quality
Dongpu Reservoir, Hefei, Anhui, China

Annual Air Quality Insights
Dongpu Reservoir, Hefei, Anhui, China