Haiyan Environmental Protection Building, Pinghu, Zhejiang, 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
Haiyan Environmental Protection Building, Pinghu, Zhejiang, China
AQI Trends: Highest and Lowest
Same Day Analysis (28th September ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 3rd highest AQI at 86 of Moderate air quality, showing improvement over 2024 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Haiyan Environmental Protection Building, Pinghu, Zhejiang, China
5 AM29th Sep 2025
6 PM
4 AM30th Sep 2025
AQI
AQI
96AQI
68AQI
In the last 24 hours,
Haiyan Environmental Protection Building's AQI reached its highest point of 96 at 5 AM during the Night, while the lowest point, 68, was recorded at 4 AM during the Night between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Haiyan Environmental Protection Building, Pinghu, Zhejiang, China
29°C26/32°C
28°C26/31°C
28°C26/30°C
29°C27/31°C
29°C27/32°C
29°C28/32°C
29°C27/32°C
29°C26/32°C
30°C28/33°C
26°C24/30°C
26°C25/28°C
27°C26/28°C
28°C26/32°C
28°C26/30°C
28°C26/30°C
28°C26/31°C
29°C27/32°C
29°C26/32°C
26°C25/28°C
28°C26/29°C
23°C22/24°C
24°C23/26°C
26°C23/27°C
27°C26/29°C
27°C26/29°C
27°C26/30°C
27°C26/30°C
28°C26/30°C
28°C25/31°C
--°C/°C
--°C/°C
57AQI
57AQI
60AQI
60AQI
2025 Days Vs Air Quality
Haiyan Environmental Protection Building, Pinghu, Zhejiang, China
11%
30
74%
200
14%
37
1%
4
Total number of days with different AQI categories in last 272 days in 2025 (93 days remaining)
Under WHO’s Safe Air Quality Limits: 11%
Health Risk Level:
Extreme
In 2025, 11% of 272 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
Haiyan Environmental Protection Building, Pinghu, Zhejiang, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
128AQI
111AQI
124AQI
98AQI
137AQI
128AQI
128AQI
131AQI
82AQI
98AQI
112AQI
127AQI
138AQI
144AQI
83AQI
105AQI
117AQI
131AQI
144AQI
168AQI
171AQI
125AQI
108AQI
94AQI
77AQI
90AQI
66AQI
78AQI
117AQI
96AQI
97AQI
63AQI
106AQI
121AQI
114AQI
95AQI
100AQI
76AQI
69AQI
81AQI
95AQI
70AQI
135AQI
93AQI
93AQI
96AQI
122AQI
95AQI
89AQI
91AQI
71AQI
70AQI
97AQI
116AQI
133AQI
145AQI
154AQI
146AQI
110AQI
96AQI
89AQI
67AQI
64AQI
64AQI
75AQI
86AQI
123AQI
79AQI
104AQI
102AQI
77AQI
72AQI
64AQI
55AQI
83AQI
71AQI
79AQI
83AQI
100AQI
83AQI
97AQI
96AQI
100AQI
101AQI
126AQI
106AQI
89AQI
94AQI
77AQI
71AQI
77AQI
97AQI
89AQI
89AQI
96AQI
104AQI
95AQI
97AQI
100AQI
100AQI
93AQI
161AQI
88AQI
93AQI
77AQI
83AQI
89AQI
94AQI
104AQI
98AQI
82AQI
84AQI
82AQI
103AQI
72AQI
77AQI
73AQI
84AQI
73AQI
85AQI
78AQI
79AQI
81AQI
65AQI
77AQI
98AQI
88AQI
76AQI
67AQI
64AQI
69AQI
76AQI
75AQI
75AQI
91AQI
89AQI
88AQI
90AQI
77AQI
76AQI
60AQI
68AQI
53AQI
82AQI
84AQI
81AQI
69AQI
73AQI
68AQI
85AQI
76AQI
58AQI
58AQI
69AQI
87AQI
66AQI
76AQI
75AQI
48AQI
65AQI
57AQI
62AQI
59AQI
54AQI
57AQI
49AQI
52AQI
60AQI
60AQI
58AQI
52AQI
55AQI
54AQI
51AQI
53AQI
60AQI
58AQI
56AQI
55AQI
55AQI
50AQI
51AQI
55AQI
56AQI
57AQI
58AQI
56AQI
47AQI
46AQI
48AQI
58AQI
51AQI
49AQI
57AQI
62AQI
66AQI
64AQI
62AQI
60AQI
49AQI
48AQI
45AQI
44AQI
42AQI
44AQI
46AQI
42AQI
43AQI
40AQI
40AQI
35AQI
46AQI
55AQI
58AQI
59AQI
61AQI
54AQI
54AQI
53AQI
56AQI
56AQI
60AQI
60AQI
61AQI
50AQI
43AQI
43AQI
46AQI
52AQI
50AQI
53AQI
58AQI
62AQI
55AQI
54AQI
53AQI
54AQI
55AQI
52AQI
48AQI
52AQI
51AQI
52AQI
55AQI
53AQI
55AQI
60AQI
57AQI
61AQI
69AQI
59AQI
58AQI
55AQI
57AQI
57AQI
61AQI
56AQI
59AQI
59AQI
60AQI
55AQI
54AQI
56AQI
54AQI
48AQI
46AQI
45AQI
48AQI
52AQI
68AQI
86AQI
115AQI
102AQI
86AQI
91AQI
77AQI
59AQI
51AQI
54AQI
57AQI
No. of days
202577AQI
Highest AQI recorded in
January115AQI
Lowest AQI recorded in
July51AQI
202470AQI
Highest AQI recorded in
December115AQI
Lowest AQI recorded in
July51AQI
202376AQI
Highest AQI recorded in
December76AQI
Lowest AQI recorded in
November75AQI
202275AQI
Highest AQI recorded in
February102AQI
Lowest AQI recorded in
September61AQI
202177AQI
Highest AQI recorded in
December123AQI
Lowest AQI recorded in
July54AQI
202075AQI
Highest AQI recorded in
December113AQI
Lowest AQI recorded in
March60AQI
Most & Least Polluted Years Over the Last 6 Years
Haiyan Environmental Protection Building's annual 2025 AQI (77) shows an average percentage change of 2.7% (worsened AQI) compared to previous years: 2020 (75), 2021 (77), 2022 (75), 2023 (76), 2024 (70).