Huixian City No 1 Middle School, Chengguan, Henan, 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
Huixian City No 1 Middle School, Chengguan, Henan, China
AQI Trends: Highest and Lowest
Same Day Analysis (22nd September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 58 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Sep - 23rd Sep 2025
Huixian City No 1 Middle School, Chengguan, Henan, China
6 AM22nd Sep 2025
6 PM
5 AM23rd Sep 2025
64AQI
38AQI
67AQI
57AQI
In the last 24 hours,
Huixian City No 1 Middle School's AQI reached its highest point of 67 at 12 AM during the Night, while the lowest point, 38, was recorded at 4 PM during the Day between 22nd Sep and 23rd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Huixian City No 1 Middle School, Chengguan, Henan, China
22°C21/23°C
26°C22/30°C
27°C23/31°C
27°C23/32°C
28°C24/34°C
26°C23/31°C
26°C22/30°C
26°C22/32°C
27°C22/34°C
26°C22/32°C
22°C20/24°C
21°C21/21°C
22°C20/25°C
23°C20/27°C
23°C19/30°C
23°C19/28°C
23°C18/30°C
23°C20/28°C
20°C18/22°C
21°C18/25°C
24°C19/30°C
26°C20/32°C
26°C23/30°C
23°C20/25°C
20°C17/22°C
16°C14/20°C
15°C14/18°C
19°C14/25°C
18°C15/20°C
15°C14/15°C
--°C/°C
68AQI
59AQI
63AQI
62AQI
2025 Days Vs Air Quality
Huixian City No 1 Middle School, Chengguan, Henan, China
60%
160
32%
84
7%
19
0.3%
1
0.3%
1
Total number of days with different AQI categories in last 266 days in 2025 (99 days remaining)
Under WHO’s Safe Air Quality Limits: 0%
Health Risk Level:
Extreme
In 2025, 0% of 266 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
Huixian City No 1 Middle School, Chengguan, Henan, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
156AQI
140AQI
160AQI
166AQI
130AQI
100AQI
99AQI
77AQI
85AQI
122AQI
90AQI
89AQI
122AQI
107AQI
91AQI
93AQI
129AQI
138AQI
141AQI
165AQI
189AQI
150AQI
156AQI
161AQI
168AQI
111AQI
83AQI
91AQI
186AQI
155AQI
163AQI
163AQI
180AQI
132AQI
130AQI
91AQI
104AQI
73AQI
85AQI
109AQI
134AQI
149AQI
112AQI
107AQI
129AQI
109AQI
94AQI
111AQI
119AQI
97AQI
121AQI
138AQI
141AQI
105AQI
149AQI
124AQI
147AQI
154AQI
167AQI
160AQI
104AQI
91AQI
96AQI
138AQI
132AQI
144AQI
140AQI
152AQI
150AQI
160AQI
147AQI
162AQI
111AQI
137AQI
75AQI
85AQI
74AQI
92AQI
66AQI
71AQI
75AQI
99AQI
370AQI
208AQI
149AQI
118AQI
125AQI
82AQI
100AQI
102AQI
98AQI
72AQI
96AQI
126AQI
78AQI
114AQI
119AQI
116AQI
134AQI
128AQI
145AQI
142AQI
105AQI
79AQI
92AQI
121AQI
137AQI
128AQI
127AQI
112AQI
110AQI
92AQI
118AQI
76AQI
109AQI
97AQI
103AQI
87AQI
86AQI
109AQI
88AQI
113AQI
73AQI
90AQI
135AQI
119AQI
140AQI
129AQI
103AQI
92AQI
80AQI
87AQI
108AQI
101AQI
77AQI
108AQI
144AQI
96AQI
128AQI
112AQI
129AQI
115AQI
139AQI
99AQI
109AQI
99AQI
116AQI
106AQI
106AQI
97AQI
97AQI
95AQI
105AQI
74AQI
82AQI
82AQI
90AQI
109AQI
106AQI
103AQI
89AQI
92AQI
89AQI
89AQI
82AQI
74AQI
64AQI
68AQI
68AQI
65AQI
69AQI
68AQI
62AQI
63AQI
66AQI
76AQI
69AQI
69AQI
64AQI
64AQI
62AQI
55AQI
58AQI
54AQI
58AQI
53AQI
54AQI
61AQI
63AQI
65AQI
73AQI
80AQI
78AQI
76AQI
76AQI
76AQI
78AQI
68AQI
70AQI
72AQI
72AQI
70AQI
70AQI
59AQI
59AQI
62AQI
61AQI
61AQI
61AQI
61AQI
59AQI
61AQI
64AQI
65AQI
64AQI
68AQI
70AQI
70AQI
69AQI
70AQI
59AQI
63AQI
65AQI
61AQI
63AQI
64AQI
65AQI
56AQI
59AQI
63AQI
62AQI
59AQI
57AQI
61AQI
60AQI
59AQI
66AQI
62AQI
68AQI
63AQI
63AQI
63AQI
63AQI
65AQI
64AQI
64AQI
52AQI
57AQI
67AQI
70AQI
66AQI
60AQI
65AQI
63AQI
60AQI
68AQI
68AQI
65AQI
59AQI
53AQI
56AQI
52AQI
64AQI
69AQI
58AQI
129AQI
124AQI
126AQI
109AQI
108AQI
79AQI
65AQI
63AQI
62AQI
No. of days
202597AQI
Highest AQI recorded in
January129AQI
Lowest AQI recorded in
September62AQI
2024104AQI
Highest AQI recorded in
January165AQI
Lowest AQI recorded in
July65AQI
2023144AQI
Highest AQI recorded in
December146AQI
Lowest AQI recorded in
November123AQI
2021158AQI
Highest AQI recorded in
January165AQI
Lowest AQI recorded in
March148AQI
2020136AQI
Highest AQI recorded in
December169AQI
Lowest AQI recorded in
August101AQI
Most & Least Polluted Years Over the Last 5 Years
Huixian City No 1 Middle School's annual 2025 AQI (97) shows an average percentage change of -26.7% (improved AQI) compared to previous years: 2020 (136), 2021 (158), 2023 (144), 2024 (104).