Hainan Normal University, Haikou, Hainan, China Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Hainan Normal University, Haikou, Hainan, China
AQI Trends: Highest and Lowest
Same Day Analysis (21st September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 41 of Good air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Hainan Normal University, Haikou, Hainan, China
6 AM21st Sep 2025
6 PM
5 AM22nd Sep 2025
54AQI
36AQI
52AQI
38AQI
In the last 24 hours,
Hainan Normal University's AQI reached its highest point of 54 at 5 PM during the Day, while the lowest point, 36, was recorded at 8 AM during the Day between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hainan Normal University, Haikou, Hainan, China
28°C26/31°C
27°C26/28°C
26°C25/27°C
27°C26/30°C
27°C26/30°C
27°C25/29°C
27°C26/28°C
27°C26/28°C
27°C26/29°C
27°C26/30°C
28°C26/30°C
28°C26/30°C
28°C26/30°C
28°C26/30°C
28°C26/31°C
28°C26/30°C
27°C25/29°C
28°C25/32°C
27°C26/30°C
28°C26/32°C
28°C25/30°C
28°C26/30°C
28°C25/31°C
28°C25/31°C
27°C26/30°C
28°C26/31°C
28°C26/29°C
28°C26/31°C
28°C26/30°C
28°C26/31°C
--°C/°C
38AQI
29AQI
38AQI
33AQI
2025 Days Vs Air Quality
Hainan Normal University, Haikou, Hainan, China
45%
119
50%
133
5%
12
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 45%
Health Risk Level:
Significant
In 2025, 45% of 265 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
Hainan Normal University, Haikou, Hainan, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
110AQI
104AQI
102AQI
92AQI
112AQI
121AQI
93AQI
92AQI
121AQI
103AQI
90AQI
77AQI
76AQI
73AQI
77AQI
92AQI
93AQI
85AQI
89AQI
96AQI
76AQI
91AQI
83AQI
70AQI
64AQI
58AQI
58AQI
60AQI
75AQI
69AQI
71AQI
58AQI
49AQI
65AQI
53AQI
59AQI
61AQI
69AQI
58AQI
68AQI
62AQI
61AQI
56AQI
69AQI
51AQI
72AQI
48AQI
71AQI
77AQI
72AQI
68AQI
64AQI
49AQI
69AQI
51AQI
68AQI
79AQI
70AQI
64AQI
60AQI
56AQI
64AQI
55AQI
54AQI
33AQI
44AQI
51AQI
62AQI
67AQI
65AQI
61AQI
57AQI
48AQI
59AQI
42AQI
69AQI
67AQI
83AQI
81AQI
81AQI
76AQI
70AQI
75AQI
75AQI
73AQI
69AQI
67AQI
52AQI
37AQI
52AQI
56AQI
69AQI
57AQI
62AQI
67AQI
72AQI
74AQI
66AQI
67AQI
76AQI
63AQI
70AQI
132AQI
134AQI
147AQI
137AQI
115AQI
94AQI
84AQI
67AQI
65AQI
66AQI
62AQI
64AQI
58AQI
53AQI
45AQI
59AQI
62AQI
61AQI
52AQI
59AQI
60AQI
59AQI
56AQI
59AQI
56AQI
53AQI
55AQI
50AQI
59AQI
62AQI
58AQI
48AQI
41AQI
38AQI
40AQI
45AQI
44AQI
50AQI
48AQI
45AQI
41AQI
38AQI
57AQI
67AQI
58AQI
50AQI
45AQI
43AQI
41AQI
48AQI
43AQI
55AQI
55AQI
42AQI
42AQI
45AQI
49AQI
49AQI
48AQI
45AQI
37AQI
33AQI
35AQI
42AQI
46AQI
50AQI
49AQI
47AQI
46AQI
42AQI
37AQI
35AQI
35AQI
34AQI
31AQI
31AQI
33AQI
35AQI
35AQI
33AQI
30AQI
31AQI
32AQI
35AQI
37AQI
35AQI
42AQI
47AQI
49AQI
50AQI
50AQI
53AQI
54AQI
55AQI
56AQI
57AQI
55AQI
51AQI
48AQI
45AQI
45AQI
48AQI
45AQI
46AQI
45AQI
48AQI
44AQI
46AQI
43AQI
45AQI
53AQI
54AQI
54AQI
55AQI
53AQI
53AQI
54AQI
53AQI
55AQI
53AQI
49AQI
47AQI
46AQI
48AQI
36AQI
32AQI
31AQI
29AQI
33AQI
36AQI
38AQI
35AQI
36AQI
39AQI
32AQI
32AQI
37AQI
41AQI
41AQI
39AQI
37AQI
36AQI
35AQI
34AQI
32AQI
34AQI
28AQI
44AQI
43AQI
36AQI
38AQI
33AQI
31AQI
32AQI
30AQI
29AQI
29AQI
29AQI
30AQI
32AQI
40AQI
41AQI
86AQI
63AQI
61AQI
77AQI
51AQI
42AQI
45AQI
43AQI
34AQI
No. of days
202557AQI
Highest AQI recorded in
January86AQI
Lowest AQI recorded in
September34AQI
202457AQI
Highest AQI recorded in
December83AQI
Lowest AQI recorded in
July28AQI
202355AQI
Highest AQI recorded in
December73AQI
Lowest AQI recorded in
September37AQI
202249AQI
Highest AQI recorded in
December66AQI
Lowest AQI recorded in
July31AQI
202149AQI
Highest AQI recorded in
January86AQI
Lowest AQI recorded in
July32AQI
202048AQI
Highest AQI recorded in
December85AQI
Lowest AQI recorded in
June31AQI
Most & Least Polluted Years Over the Last 6 Years
Hainan Normal University's annual 2025 AQI (57) shows an average percentage change of 9.8% (worsened AQI) compared to previous years: 2020 (48), 2021 (49), 2022 (49), 2023 (55), 2024 (57).