Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China
AQI Trends: Highest and Lowest
Same Day Analysis (17th October ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 122 of Poor air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China
6 AM17th Oct 2025
5 PM
5 AM18th Oct 2025
146AQI
93AQI
92AQI
61AQI
In the last 24 hours,
Yi County Environmental Protection Bureau's AQI reached its highest point of 146 at 8 AM during the Day, while the lowest point, 61, was recorded at 5 AM during the Night between 17th Oct and 18th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China
18°C13/23°C
17°C14/21°C
19°C13/26°C
21°C16/25°C
17°C15/20°C
16°C14/18°C
19°C12/26°C
21°C16/27°C
22°C18/27°C
18°C16/20°C
21°C15/28°C
22°C17/28°C
22°C17/29°C
23°C18/28°C
22°C17/27°C
20°C17/23°C
20°C16/24°C
18°C14/21°C
14°C12/17°C
18°C14/23°C
12°C8/18°C
9°C8/10°C
10°C9/11°C
13°C10/18°C
14°C12/17°C
15°C11/20°C
16°C12/21°C
16°C14/20°C
13°C11/14°C
12°C9/15°C
--°C/°C
99AQI
77AQI
96AQI
74AQI
2025 Days Vs Air Quality
Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China
1%
3
78%
225
17%
50
4%
11
0.3%
1
Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)
Under WHO’s Safe Air Quality Limits: 1%
Health Risk Level:
Extreme
In 2025, 1% of 291 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
Yi County Environmental Protection Bureau, Gaobeidian, Hebei, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
104AQI
92AQI
108AQI
127AQI
88AQI
71AQI
57AQI
49AQI
56AQI
68AQI
83AQI
72AQI
103AQI
55AQI
75AQI
69AQI
115AQI
137AQI
100AQI
152AQI
124AQI
127AQI
143AQI
157AQI
165AQI
133AQI
75AQI
94AQI
195AQI
125AQI
166AQI
147AQI
136AQI
85AQI
82AQI
58AQI
73AQI
42AQI
57AQI
68AQI
120AQI
140AQI
87AQI
115AQI
127AQI
129AQI
78AQI
72AQI
90AQI
76AQI
84AQI
82AQI
70AQI
52AQI
82AQI
68AQI
101AQI
141AQI
160AQI
206AQI
141AQI
104AQI
97AQI
130AQI
76AQI
137AQI
138AQI
161AQI
168AQI
181AQI
110AQI
159AQI
106AQI
110AQI
63AQI
71AQI
62AQI
72AQI
52AQI
57AQI
66AQI
118AQI
76AQI
88AQI
91AQI
73AQI
75AQI
62AQI
75AQI
82AQI
69AQI
65AQI
87AQI
102AQI
65AQI
99AQI
89AQI
93AQI
87AQI
98AQI
144AQI
87AQI
87AQI
70AQI
79AQI
116AQI
99AQI
88AQI
93AQI
106AQI
115AQI
75AQI
85AQI
63AQI
85AQI
113AQI
73AQI
81AQI
80AQI
79AQI
67AQI
78AQI
58AQI
79AQI
94AQI
76AQI
99AQI
108AQI
71AQI
86AQI
80AQI
95AQI
97AQI
72AQI
75AQI
98AQI
69AQI
86AQI
91AQI
114AQI
100AQI
107AQI
101AQI
82AQI
89AQI
87AQI
96AQI
93AQI
94AQI
97AQI
109AQI
114AQI
89AQI
63AQI
61AQI
73AQI
70AQI
69AQI
72AQI
74AQI
65AQI
76AQI
81AQI
84AQI
79AQI
61AQI
56AQI
67AQI
76AQI
67AQI
65AQI
62AQI
53AQI
66AQI
67AQI
72AQI
72AQI
78AQI
77AQI
76AQI
76AQI
67AQI
70AQI
62AQI
68AQI
57AQI
56AQI
61AQI
64AQI
70AQI
70AQI
80AQI
80AQI
66AQI
72AQI
73AQI
69AQI
61AQI
66AQI
74AQI
63AQI
66AQI
68AQI
65AQI
66AQI
69AQI
69AQI
67AQI
67AQI
49AQI
56AQI
61AQI
67AQI
68AQI
62AQI
63AQI
61AQI
69AQI
68AQI
63AQI
55AQI
59AQI
63AQI
65AQI
60AQI
66AQI
69AQI
55AQI
61AQI
64AQI
59AQI
58AQI
56AQI
54AQI
54AQI
56AQI
55AQI
61AQI
58AQI
53AQI
63AQI
62AQI
58AQI
59AQI
71AQI
73AQI
72AQI
76AQI
66AQI
66AQI
66AQI
72AQI
69AQI
73AQI
75AQI
78AQI
70AQI
71AQI
58AQI
52AQI
56AQI
59AQI
65AQI
78AQI
63AQI
74AQI
77AQI
92AQI
112AQI
82AQI
105AQI
98AQI
90AQI
118AQI
86AQI
114AQI
137AQI
126AQI
70AQI
105AQI
97AQI
53AQI
52AQI
57AQI
84AQI
92AQI
97AQI
140AQI
151AQI
122AQI
106AQI
94AQI
103AQI
89AQI
89AQI
72AQI
66AQI
61AQI
74AQI
100AQI
No. of days
202585AQI
Highest AQI recorded in
January106AQI
Lowest AQI recorded in
August61AQI
202483AQI
Highest AQI recorded in
October121AQI
Lowest AQI recorded in
March44AQI
202361AQI
Highest AQI recorded in
December61AQI
Lowest AQI recorded in
November60AQI
2022107AQI
Highest AQI recorded in
January138AQI
Lowest AQI recorded in
July67AQI
202181AQI
Highest AQI recorded in
March180AQI
Lowest AQI recorded in
October1AQI
2020103AQI
Highest AQI recorded in
December124AQI
Lowest AQI recorded in
September78AQI
Most & Least Polluted Years Over the Last 6 Years
Yi County Environmental Protection Bureau's annual 2025 AQI (85) shows an average percentage change of 1.3% (worsened AQI) compared to previous years: 2020 (103), 2021 (81), 2022 (107), 2023 (61), 2024 (83).