Coronel, Biobio, Chile 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
Coronel, Biobio, Chile
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 46 of Good air quality, showing improvement over 2024, 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Coronel, Biobio, Chile
7 AM4th Oct 2025
7 PM
6 AM5th Oct 2025
63AQI
14AQI
76AQI
50AQI
In the last 24 hours,
Coronel's AQI reached its highest point of 76 at 1 AM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Coronel, Biobio, Chile
9°C4/16°C
10°C7/13°C
10°C8/11°C
11°C9/13°C
11°C10/12°C
11°C9/14°C
11°C7/16°C
10°C8/14°C
11°C9/14°C
10°C7/15°C
11°C7/17°C
13°C9/18°C
12°C10/15°C
11°C9/13°C
11°C10/12°C
11°C9/12°C
10°C7/13°C
9°C5/14°C
11°C8/15°C
13°C9/19°C
12°C8/15°C
11°C9/13°C
11°C7/15°C
10°C9/13°C
10°C6/15°C
11°C6/19°C
12°C7/20°C
12°C8/18°C
11°C7/14°C
11°C8/13°C
--°C/°C
46AQI
35AQI
55AQI
35AQI
2025 Days Vs Air Quality
Coronel, Biobio, Chile
48%
134
39%
108
12%
33
0.7%
2
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 48%
Health Risk Level:
Significant
In 2025, 48% of 278 days were within WHO’s safe air quality limits, and 52% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.
Annual Air Quality Insights
Coronel, Biobio, Chile
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
43AQI
39AQI
46AQI
38AQI
47AQI
45AQI
31AQI
32AQI
34AQI
43AQI
39AQI
28AQI
36AQI
42AQI
24AQI
22AQI
26AQI
29AQI
32AQI
31AQI
27AQI
25AQI
28AQI
33AQI
31AQI
31AQI
28AQI
48AQI
46AQI
28AQI
33AQI
38AQI
23AQI
30AQI
42AQI
27AQI
33AQI
93AQI
47AQI
50AQI
40AQI
59AQI
51AQI
47AQI
41AQI
46AQI
35AQI
39AQI
52AQI
47AQI
29AQI
32AQI
24AQI
21AQI
29AQI
44AQI
39AQI
32AQI
25AQI
26AQI
22AQI
21AQI
28AQI
29AQI
23AQI
18AQI
30AQI
34AQI
33AQI
46AQI
54AQI
48AQI
50AQI
48AQI
48AQI
44AQI
46AQI
53AQI
42AQI
27AQI
41AQI
53AQI
77AQI
78AQI
131AQI
68AQI
39AQI
29AQI
31AQI
39AQI
39AQI
50AQI
57AQI
74AQI
54AQI
45AQI
72AQI
73AQI
46AQI
28AQI
46AQI
45AQI
56AQI
38AQI
49AQI
45AQI
58AQI
69AQI
81AQI
87AQI
54AQI
35AQI
59AQI
36AQI
47AQI
71AQI
77AQI
72AQI
75AQI
81AQI
42AQI
91AQI
80AQI
63AQI
80AQI
68AQI
67AQI
49AQI
50AQI
81AQI
82AQI
80AQI
109AQI
78AQI
116AQI
61AQI
52AQI
73AQI
77AQI
97AQI
78AQI
112AQI
127AQI
102AQI
58AQI
57AQI
85AQI
105AQI
109AQI
79AQI
99AQI
129AQI
145AQI
95AQI
95AQI
110AQI
113AQI
86AQI
124AQI
148AQI
139AQI
62AQI
55AQI
67AQI
41AQI
44AQI
54AQI
59AQI
102AQI
93AQI
122AQI
56AQI
53AQI
123AQI
126AQI
123AQI
118AQI
107AQI
135AQI
96AQI
120AQI
131AQI
144AQI
155AQI
157AQI
97AQI
44AQI
58AQI
65AQI
89AQI
107AQI
97AQI
76AQI
71AQI
67AQI
51AQI
108AQI
103AQI
92AQI
101AQI
117AQI
99AQI
66AQI
105AQI
70AQI
37AQI
64AQI
49AQI
35AQI
74AQI
35AQI
41AQI
30AQI
42AQI
71AQI
73AQI
83AQI
72AQI
64AQI
101AQI
98AQI
63AQI
61AQI
37AQI
60AQI
75AQI
61AQI
49AQI
78AQI
68AQI
58AQI
41AQI
33AQI
33AQI
58AQI
65AQI
53AQI
62AQI
64AQI
55AQI
51AQI
89AQI
71AQI
49AQI
38AQI
49AQI
41AQI
78AQI
64AQI
42AQI
34AQI
26AQI
36AQI
59AQI
70AQI
37AQI
53AQI
52AQI
55AQI
52AQI
33AQI
31AQI
27AQI
40AQI
37AQI
49AQI
66AQI
26AQI
24AQI
39AQI
31AQI
37AQI
46AQI
41AQI
50AQI
55AQI
46AQI
34AQI
40AQI
44AQI
57AQI
81AQI
98AQI
84AQI
62AQI
44AQI
48AQI
No. of days
202560AQI
Highest AQI recorded in
June98AQI
Lowest AQI recorded in
January34AQI
202454AQI
Highest AQI recorded in
July88AQI
Lowest AQI recorded in
December36AQI
202353AQI
Highest AQI recorded in
May77AQI
Lowest AQI recorded in
December35AQI
202249AQI
Highest AQI recorded in
May80AQI
Lowest AQI recorded in
January31AQI
202162AQI
Highest AQI recorded in
July92AQI
Lowest AQI recorded in
November41AQI
202061AQI
Highest AQI recorded in
April91AQI
Lowest AQI recorded in
December37AQI
Most & Least Polluted Years Over the Last 6 Years
Coronel's annual 2025 AQI (60) shows an average percentage change of 8.8% (worsened AQI) compared to previous years: 2020 (61), 2021 (62), 2022 (49), 2023 (53), 2024 (54).