Hangzhou, 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
Hangzhou, Zhejiang, China
AQI Trends: Highest and Lowest
Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 63 of Moderate air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Hangzhou, Zhejiang, China
5 AM17th Sep 2025
6 PM
4 AM18th Sep 2025
AQI
AQI
66AQI
55AQI
In the last 24 hours,
Hangzhou's AQI reached its highest point of 66 at 8 AM during the Night, while the lowest point, 55, was recorded at 12 AM during the Night between 17th Sep and 18th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hangzhou, Zhejiang, China
31°C27/38°C
31°C27/39°C
31°C26/38°C
30°C25/37°C
31°C26/38°C
32°C27/40°C
30°C25/39°C
30°C25/36°C
31°C26/37°C
32°C26/38°C
31°C26/37°C
31°C27/38°C
29°C25/38°C
29°C25/34°C
27°C25/31°C
30°C24/37°C
30°C26/35°C
30°C26/36°C
30°C26/37°C
31°C26/36°C
31°C27/39°C
26°C24/32°C
26°C24/29°C
27°C24/30°C
29°C25/36°C
28°C24/33°C
28°C25/34°C
29°C25/35°C
30°C26/36°C
--°C/°C
--°C/°C
58AQI
58AQI
59AQI
57AQI
2025 Days Vs Air Quality
Hangzhou, Zhejiang, China
11%
29
65%
168
22%
56
2%
5
0.3%
1
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 11%
Health Risk Level:
Extreme
In 2025, 11% of 260 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
Hangzhou, Zhejiang, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
148AQI
141AQI
146AQI
141AQI
158AQI
142AQI
143AQI
136AQI
93AQI
100AQI
105AQI
118AQI
133AQI
139AQI
82AQI
100AQI
109AQI
133AQI
129AQI
159AQI
166AQI
163AQI
137AQI
105AQI
86AQI
88AQI
62AQI
76AQI
131AQI
110AQI
122AQI
69AQI
115AQI
118AQI
107AQI
93AQI
118AQI
75AQI
73AQI
77AQI
101AQI
126AQI
133AQI
142AQI
139AQI
147AQI
102AQI
116AQI
91AQI
115AQI
88AQI
81AQI
103AQI
134AQI
130AQI
157AQI
147AQI
135AQI
111AQI
100AQI
90AQI
64AQI
62AQI
76AQI
86AQI
113AQI
119AQI
104AQI
131AQI
122AQI
101AQI
83AQI
74AQI
56AQI
87AQI
64AQI
81AQI
88AQI
90AQI
77AQI
87AQI
83AQI
90AQI
89AQI
118AQI
98AQI
84AQI
87AQI
82AQI
70AQI
85AQI
89AQI
105AQI
107AQI
95AQI
107AQI
96AQI
103AQI
111AQI
97AQI
95AQI
229AQI
88AQI
102AQI
75AQI
80AQI
85AQI
99AQI
108AQI
113AQI
103AQI
90AQI
86AQI
95AQI
71AQI
81AQI
67AQI
89AQI
80AQI
89AQI
77AQI
81AQI
82AQI
66AQI
74AQI
97AQI
104AQI
83AQI
58AQI
61AQI
67AQI
74AQI
78AQI
80AQI
123AQI
83AQI
79AQI
83AQI
74AQI
69AQI
52AQI
73AQI
50AQI
84AQI
89AQI
91AQI
91AQI
77AQI
73AQI
88AQI
84AQI
64AQI
47AQI
69AQI
82AQI
67AQI
71AQI
85AQI
50AQI
64AQI
57AQI
59AQI
68AQI
57AQI
56AQI
41AQI
49AQI
61AQI
59AQI
56AQI
52AQI
53AQI
51AQI
49AQI
55AQI
69AQI
64AQI
56AQI
52AQI
52AQI
55AQI
48AQI
53AQI
58AQI
59AQI
59AQI
54AQI
50AQI
47AQI
51AQI
59AQI
54AQI
52AQI
56AQI
61AQI
65AQI
63AQI
62AQI
63AQI
48AQI
45AQI
41AQI
43AQI
48AQI
45AQI
48AQI
40AQI
43AQI
41AQI
45AQI
34AQI
39AQI
55AQI
59AQI
58AQI
63AQI
58AQI
52AQI
47AQI
50AQI
53AQI
57AQI
58AQI
61AQI
53AQI
43AQI
42AQI
46AQI
51AQI
50AQI
53AQI
58AQI
61AQI
55AQI
52AQI
55AQI
56AQI
58AQI
55AQI
49AQI
52AQI
51AQI
53AQI
56AQI
54AQI
57AQI
70AQI
69AQI
66AQI
73AQI
66AQI
58AQI
55AQI
57AQI
58AQI
59AQI
56AQI
64AQI
63AQI
123AQI
112AQI
89AQI
97AQI
79AQI
59AQI
51AQI
54AQI
61AQI
No. of days
202581AQI
Highest AQI recorded in
January123AQI
Lowest AQI recorded in
July51AQI
202483AQI
Highest AQI recorded in
January137AQI
Lowest AQI recorded in
July52AQI
202388AQI
Highest AQI recorded in
December116AQI
Lowest AQI recorded in
July53AQI
202287AQI
Highest AQI recorded in
January121AQI
Lowest AQI recorded in
July61AQI
202184AQI
Highest AQI recorded in
December119AQI
Lowest AQI recorded in
July59AQI
202083AQI
Highest AQI recorded in
December131AQI
Lowest AQI recorded in
June63AQI
Most & Least Polluted Years Over the Last 6 Years
Hangzhou's annual 2025 AQI (81) shows an average percentage change of -4.3% (improved AQI) compared to previous years: 2020 (83), 2021 (84), 2022 (87), 2023 (88), 2024 (83).