Hengyang Chemical Plant, Hengyang, Hunan, 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
Hengyang Chemical Plant, Hengyang, Hunan, China
AQI Trends: Highest and Lowest
Same Day Analysis (17th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 61 of Moderate air quality, showing improvement over 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Hengyang Chemical Plant, Hengyang, Hunan, China
6 AM17th Sep 2025
6 PM
5 AM18th Sep 2025
71AQI
40AQI
69AQI
53AQI
In the last 24 hours,
Hengyang Chemical Plant's AQI reached its highest point of 71 at 9 AM during the Day, while the lowest point, 40, was recorded at 6 PM during the Day between 17th Sep and 18th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hengyang Chemical Plant, Hengyang, Hunan, China
28°C24/33°C
29°C26/35°C
28°C26/31°C
28°C25/33°C
30°C25/36°C
32°C26/38°C
31°C25/38°C
30°C24/38°C
30°C24/38°C
29°C24/37°C
31°C25/38°C
30°C26/37°C
30°C25/36°C
30°C26/36°C
31°C26/37°C
31°C26/37°C
31°C27/37°C
31°C26/38°C
29°C25/36°C
28°C24/35°C
29°C25/35°C
27°C24/31°C
28°C23/35°C
29°C24/35°C
30°C25/36°C
30°C24/36°C
30°C26/36°C
30°C26/36°C
31°C26/38°C
30°C24/38°C
--°C/°C
60AQI
54AQI
61AQI
58AQI
2025 Days Vs Air Quality
Hengyang Chemical Plant, Hengyang, Hunan, China
9%
23
59%
153
23%
60
8%
21
1%
3
Total number of days with different AQI categories in last 261 days in 2025 (104 days remaining)
Under WHO’s Safe Air Quality Limits: 9%
Health Risk Level:
Extreme
In 2025, 9% of 261 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 Chemical Plant, Hengyang, Hunan, China
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
173AQI
165AQI
182AQI
188AQI
175AQI
167AQI
165AQI
151AQI
128AQI
131AQI
133AQI
140AQI
131AQI
144AQI
142AQI
124AQI
142AQI
150AQI
161AQI
163AQI
160AQI
168AQI
203AQI
226AQI
98AQI
110AQI
97AQI
120AQI
198AQI
152AQI
135AQI
110AQI
96AQI
118AQI
115AQI
140AQI
127AQI
121AQI
78AQI
93AQI
99AQI
124AQI
130AQI
152AQI
159AQI
157AQI
120AQI
126AQI
102AQI
92AQI
72AQI
139AQI
65AQI
118AQI
129AQI
152AQI
154AQI
127AQI
104AQI
88AQI
79AQI
59AQI
71AQI
66AQI
103AQI
91AQI
100AQI
101AQI
101AQI
105AQI
100AQI
115AQI
66AQI
77AQI
79AQI
79AQI
79AQI
80AQI
97AQI
111AQI
108AQI
141AQI
125AQI
149AQI
142AQI
144AQI
93AQI
93AQI
67AQI
91AQI
91AQI
101AQI
111AQI
142AQI
145AQI
142AQI
148AQI
134AQI
146AQI
115AQI
117AQI
263AQI
161AQI
153AQI
133AQI
130AQI
121AQI
111AQI
80AQI
83AQI
71AQI
78AQI
84AQI
64AQI
67AQI
74AQI
65AQI
82AQI
99AQI
90AQI
87AQI
90AQI
101AQI
105AQI
86AQI
96AQI
104AQI
80AQI
74AQI
82AQI
81AQI
93AQI
94AQI
93AQI
106AQI
73AQI
77AQI
66AQI
65AQI
55AQI
59AQI
57AQI
66AQI
89AQI
94AQI
93AQI
101AQI
65AQI
68AQI
63AQI
52AQI
56AQI
61AQI
72AQI
81AQI
83AQI
78AQI
68AQI
68AQI
78AQI
82AQI
78AQI
65AQI
67AQI
55AQI
51AQI
53AQI
47AQI
46AQI
46AQI
46AQI
49AQI
52AQI
55AQI
52AQI
57AQI
57AQI
50AQI
48AQI
49AQI
48AQI
45AQI
41AQI
42AQI
49AQI
59AQI
65AQI
70AQI
70AQI
70AQI
62AQI
62AQI
62AQI
62AQI
64AQI
59AQI
59AQI
59AQI
63AQI
63AQI
58AQI
53AQI
50AQI
48AQI
53AQI
54AQI
57AQI
55AQI
55AQI
55AQI
54AQI
58AQI
62AQI
65AQI
60AQI
58AQI
58AQI
48AQI
50AQI
50AQI
54AQI
56AQI
61AQI
64AQI
64AQI
59AQI
45AQI
55AQI
56AQI
51AQI
45AQI
46AQI
47AQI
48AQI
55AQI
55AQI
53AQI
56AQI
59AQI
60AQI
59AQI
58AQI
60AQI
61AQI
61AQI
62AQI
57AQI
63AQI
70AQI
71AQI
63AQI
55AQI
55AQI
55AQI
54AQI
59AQI
61AQI
61AQI
63AQI
61AQI
152AQI
119AQI
97AQI
113AQI
81AQI
60AQI
57AQI
55AQI
61AQI
No. of days
202590AQI
Highest AQI recorded in
January152AQI
Lowest AQI recorded in
August55AQI
202488AQI
Highest AQI recorded in
December147AQI
Lowest AQI recorded in
July23AQI
2023100AQI
Highest AQI recorded in
January150AQI
Lowest AQI recorded in
July59AQI
202294AQI
Highest AQI recorded in
December139AQI
Lowest AQI recorded in
July56AQI
202189AQI
Highest AQI recorded in
January153AQI
Lowest AQI recorded in
May41AQI
202066AQI
Highest AQI recorded in
December149AQI
Lowest AQI recorded in
June32AQI
Most & Least Polluted Years Over the Last 6 Years
Hengyang Chemical Plant's annual 2025 AQI (90) shows an average percentage change of 4.5% (worsened AQI) compared to previous years: 2020 (66), 2021 (89), 2022 (94), 2023 (100), 2024 (88).