Hziyan, Xining, Qinghai, 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
Hziyan, Xining, Qinghai, China
AQI Trends: Highest and Lowest
Same Day Analysis (18th September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 60 of Moderate air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Hziyan, Xining, Qinghai, China
6 AM18th Sep 2025
7 PM
5 AM19th Sep 2025
64AQI
40AQI
64AQI
56AQI
In the last 24 hours,
Hziyan's AQI reached its highest point of 64 at 6 AM during the Night, while the lowest point, 40, was recorded at 3 PM during the Day between 18th Sep and 19th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hziyan, Xining, Qinghai, China
11°C8/14°C
12°C7/18°C
10°C8/14°C
12°C6/18°C
13°C7/20°C
14°C9/20°C
14°C11/18°C
10°C6/11°C
6°C5/8°C
9°C3/16°C
10°C5/17°C
11°C4/17°C
12°C6/20°C
11°C7/15°C
13°C9/18°C
14°C10/20°C
12°C7/18°C
12°C5/18°C
12°C7/19°C
11°C5/18°C
12°C8/19°C
12°C7/18°C
13°C8/18°C
12°C6/19°C
13°C5/21°C
12°C5/20°C
12°C7/19°C
11°C5/18°C
10°C4/16°C
9°C5/17°C
--°C/°C
65AQI
57AQI
62AQI
59AQI
2025 Days Vs Air Quality
Hziyan, Xining, Qinghai, China
2%
4
84%
220
14%
37
Total number of days with different AQI categories in last 262 days in 2025 (103 days remaining)
Under WHO’s Safe Air Quality Limits: 2%
Health Risk Level:
Extreme
In 2025, 2% of 262 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
Hziyan, Xining, Qinghai, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
85AQI
76AQI
101AQI
93AQI
104AQI
99AQI
102AQI
120AQI
111AQI
89AQI
82AQI
83AQI
83AQI
81AQI
94AQI
105AQI
92AQI
79AQI
91AQI
82AQI
88AQI
92AQI
103AQI
96AQI
88AQI
78AQI
85AQI
94AQI
106AQI
80AQI
96AQI
93AQI
83AQI
94AQI
88AQI
82AQI
75AQI
72AQI
74AQI
79AQI
79AQI
78AQI
92AQI
90AQI
55AQI
59AQI
58AQI
57AQI
57AQI
68AQI
64AQI
70AQI
67AQI
62AQI
60AQI
56AQI
52AQI
57AQI
57AQI
63AQI
46AQI
59AQI
58AQI
59AQI
67AQI
68AQI
63AQI
66AQI
63AQI
106AQI
83AQI
78AQI
81AQI
73AQI
79AQI
79AQI
80AQI
75AQI
85AQI
84AQI
75AQI
81AQI
109AQI
146AQI
138AQI
93AQI
99AQI
93AQI
118AQI
106AQI
133AQI
129AQI
126AQI
129AQI
110AQI
100AQI
118AQI
113AQI
108AQI
81AQI
91AQI
121AQI
81AQI
86AQI
84AQI
112AQI
99AQI
108AQI
132AQI
133AQI
120AQI
113AQI
83AQI
90AQI
87AQI
85AQI
82AQI
77AQI
80AQI
105AQI
84AQI
107AQI
111AQI
87AQI
113AQI
110AQI
119AQI
101AQI
93AQI
79AQI
75AQI
71AQI
81AQI
74AQI
74AQI
83AQI
108AQI
80AQI
88AQI
86AQI
93AQI
86AQI
74AQI
76AQI
67AQI
68AQI
70AQI
74AQI
82AQI
90AQI
92AQI
81AQI
78AQI
72AQI
76AQI
64AQI
68AQI
78AQI
82AQI
80AQI
73AQI
79AQI
87AQI
89AQI
80AQI
80AQI
75AQI
78AQI
75AQI
72AQI
69AQI
68AQI
56AQI
62AQI
58AQI
61AQI
62AQI
59AQI
64AQI
63AQI
61AQI
60AQI
59AQI
60AQI
52AQI
52AQI
51AQI
55AQI
57AQI
56AQI
61AQI
59AQI
64AQI
72AQI
70AQI
69AQI
65AQI
63AQI
67AQI
62AQI
58AQI
58AQI
62AQI
67AQI
57AQI
55AQI
59AQI
61AQI
59AQI
59AQI
63AQI
69AQI
61AQI
61AQI
60AQI
53AQI
55AQI
57AQI
59AQI
53AQI
54AQI
56AQI
60AQI
58AQI
59AQI
58AQI
57AQI
56AQI
59AQI
58AQI
56AQI
59AQI
51AQI
51AQI
50AQI
54AQI
57AQI
56AQI
51AQI
48AQI
49AQI
52AQI
54AQI
55AQI
64AQI
63AQI
65AQI
59AQI
66AQI
65AQI
64AQI
62AQI
66AQI
63AQI
58AQI
69AQI
72AQI
82AQI
72AQI
59AQI
60AQI
92AQI
71AQI
83AQI
104AQI
87AQI
72AQI
61AQI
56AQI
65AQI
No. of days
202577AQI
Highest AQI recorded in
April104AQI
Lowest AQI recorded in
August56AQI
202468AQI
Highest AQI recorded in
December103AQI
Lowest AQI recorded in
August55AQI
202351AQI
Highest AQI recorded in
December51AQI
Lowest AQI recorded in
November45AQI
202159AQI
Highest AQI recorded in
January59AQI
Lowest AQI recorded in
January59AQI
202067AQI
Highest AQI recorded in
November76AQI
Lowest AQI recorded in
May56AQI
Most & Least Polluted Years Over the Last 5 Years
Hziyan's annual 2025 AQI (77) shows an average percentage change of 27.9% (worsened AQI) compared to previous years: 2020 (67), 2021 (59), 2023 (51), 2024 (68).