Hengyang, Hunan, 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
Hengyang, Hunan, China
AQI Trends: Highest and Lowest
Same Day Analysis (12th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 160 of Unhealthy air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 12th Oct - 13th Oct 2025
Hengyang, Hunan, China
6 AM12th Oct 2025
6 PM
5 AM13th Oct 2025
185AQI
143AQI
207AQI
145AQI
In the last 24 hours,
Hengyang's AQI reached its highest point of 207 at 2 AM during the Night, while the lowest point, 143, was recorded at 6 PM during the Day between 12th Oct and 13th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Hengyang, Hunan, China
30°C24/36°C
30°C26/36°C
30°C26/36°C
31°C26/38°C
30°C24/38°C
23°C21/27°C
22°C18/27°C
19°C18/20°C
20°C19/21°C
22°C20/26°C
22°C19/26°C
19°C18/19°C
20°C19/23°C
22°C19/27°C
25°C21/30°C
28°C22/34°C
27°C24/32°C
26°C21/32°C
28°C23/34°C
30°C25/36°C
29°C24/35°C
27°C21/33°C
29°C24/36°C
30°C25/36°C
31°C26/37°C
31°C26/37°C
32°C28/38°C
32°C27/38°C
32°C27/37°C
30°C24/36°C
--°C/°C
86AQI
75AQI
90AQI
75AQI
2025 Days Vs Air Quality
Hengyang, Hunan, China
9%
26
59%
169
23%
65
7%
21
1%
4
Total number of days with different AQI categories in last 286 days in 2025 (79 days remaining)
Under WHO’s Safe Air Quality Limits: 9%
Health Risk Level:
Extreme
In 2025, 9% of 286 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
Hengyang, Hunan, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
172AQI
161AQI
180AQI
188AQI
176AQI
167AQI
164AQI
152AQI
131AQI
131AQI
130AQI
139AQI
133AQI
143AQI
144AQI
126AQI
142AQI
149AQI
161AQI
163AQI
162AQI
167AQI
201AQI
226AQI
105AQI
110AQI
99AQI
122AQI
209AQI
157AQI
139AQI
111AQI
97AQI
117AQI
120AQI
143AQI
131AQI
121AQI
81AQI
92AQI
102AQI
124AQI
130AQI
152AQI
159AQI
156AQI
118AQI
125AQI
102AQI
95AQI
74AQI
139AQI
70AQI
116AQI
128AQI
151AQI
153AQI
127AQI
104AQI
88AQI
78AQI
60AQI
69AQI
69AQI
101AQI
93AQI
99AQI
102AQI
96AQI
105AQI
96AQI
108AQI
69AQI
76AQI
80AQI
79AQI
81AQI
79AQI
94AQI
108AQI
109AQI
138AQI
126AQI
145AQI
133AQI
133AQI
92AQI
90AQI
68AQI
90AQI
92AQI
100AQI
110AQI
137AQI
140AQI
138AQI
141AQI
130AQI
139AQI
116AQI
118AQI
270AQI
159AQI
151AQI
134AQI
127AQI
119AQI
110AQI
83AQI
85AQI
75AQI
77AQI
81AQI
66AQI
67AQI
73AQI
66AQI
78AQI
95AQI
86AQI
89AQI
90AQI
99AQI
96AQI
84AQI
91AQI
100AQI
81AQI
74AQI
82AQI
82AQI
95AQI
90AQI
91AQI
101AQI
73AQI
77AQI
65AQI
68AQI
57AQI
60AQI
58AQI
64AQI
86AQI
90AQI
90AQI
98AQI
68AQI
67AQI
64AQI
56AQI
57AQI
59AQI
70AQI
81AQI
83AQI
80AQI
70AQI
67AQI
75AQI
80AQI
74AQI
65AQI
69AQI
59AQI
55AQI
55AQI
49AQI
43AQI
44AQI
44AQI
47AQI
47AQI
52AQI
51AQI
58AQI
58AQI
49AQI
48AQI
47AQI
49AQI
43AQI
39AQI
45AQI
51AQI
62AQI
67AQI
72AQI
71AQI
71AQI
61AQI
62AQI
62AQI
62AQI
64AQI
58AQI
58AQI
58AQI
64AQI
64AQI
58AQI
50AQI
47AQI
44AQI
52AQI
54AQI
57AQI
54AQI
56AQI
56AQI
55AQI
56AQI
61AQI
65AQI
58AQI
58AQI
58AQI
47AQI
50AQI
49AQI
54AQI
56AQI
61AQI
65AQI
64AQI
58AQI
45AQI
55AQI
56AQI
51AQI
44AQI
45AQI
47AQI
49AQI
55AQI
53AQI
52AQI
56AQI
59AQI
59AQI
59AQI
58AQI
60AQI
60AQI
61AQI
62AQI
61AQI
65AQI
69AQI
70AQI
63AQI
55AQI
56AQI
55AQI
54AQI
59AQI
61AQI
62AQI
63AQI
59AQI
67AQI
66AQI
61AQI
61AQI
59AQI
61AQI
50AQI
52AQI
45AQI
67AQI
82AQI
121AQI
82AQI
114AQI
117AQI
73AQI
116AQI
119AQI
60AQI
109AQI
125AQI
100AQI
113AQI
118AQI
160AQI
153AQI
119AQI
95AQI
112AQI
80AQI
60AQI
57AQI
55AQI
64AQI
110AQI
No. of days
202589AQI
Highest AQI recorded in
January153AQI
Lowest AQI recorded in
August55AQI
202491AQI
Highest AQI recorded in
December148AQI
Lowest AQI recorded in
July39AQI
202398AQI
Highest AQI recorded in
January152AQI
Lowest AQI recorded in
July55AQI
202290AQI
Highest AQI recorded in
December139AQI
Lowest AQI recorded in
July48AQI
202189AQI
Highest AQI recorded in
January151AQI
Lowest AQI recorded in
July57AQI
202078AQI
Highest AQI recorded in
December147AQI
Lowest AQI recorded in
June43AQI
Most & Least Polluted Years Over the Last 6 Years
Hengyang's annual 2025 AQI (89) shows an average percentage change of 0.4% (worsened AQI) compared to previous years: 2020 (78), 2021 (89), 2022 (90), 2023 (98), 2024 (91).