Chillan, 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
Chillan, Biobio, Chile
AQI Trends: Highest and Lowest
Same Day Analysis (2nd October):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 36 of Good air quality, showing improvement over 2025 and 2022 on the same day.
Day & Night AQI Trend: 2nd Oct - 3rd Oct 2026
Chillan, Biobio, Chile
7 AM2nd Oct 2026
7 PM
6 AM3rd Oct 2026
28AQI
16AQI
59AQI
22AQI
In the last 24 hours,
Chillan's AQI reached its highest point of 59 at 12 AM during the Night, while the lowest point, 16, was recorded at 9 AM during the Day between 2nd Oct and 3rd Oct 2026.
Day & Night AQI Trend : Sep - Oct 2026
Chillan, Biobio, Chile
7°C2/13°C
7°C2/16°C
7°C1/14°C
9°C5/15°C
10°C5/15°C
10°C6/15°C
10°C7/14°C
8°C6/10°C
8°C3/17°C
8°C2/15°C
11°C6/19°C
13°C7/20°C
14°C10/19°C
13°C7/20°C
15°C10/20°C
13°C10/15°C
10°C7/12°C
10°C6/14°C
11°C6/17°C
12°C10/15°C
12°C11/13°C
13°C11/16°C
14°C11/19°C
14°C11/18°C
12°C8/17°C
9°C5/13°C
9°C7/12°C
13°C8/18°C
11°C7/15°C
10°C6/15°C
47AQI
28AQI
66AQI
31AQI
2026 Days Vs Air Quality
Chillan, Biobio, Chile
67%
182
27%
74
6%
16
Total number of days with different AQI categories in last 276 days in 2026 (89 days remaining)
Under WHO’s Safe Air Quality Limits: 67%
Health Risk Level:
Moderate
In 2026, 67% of 276 days were within WHO’s safe air quality limits, and 33% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
Annual Air Quality Insights
Chillan, Biobio, Chile
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI (US)
26AQI (US)
30AQI (US)
34AQI (US)
24AQI (US)
24AQI (US)
28AQI (US)
42AQI (US)
32AQI (US)
28AQI (US)
20AQI (US)
21AQI (US)
17AQI (US)
50AQI (US)
53AQI (US)
22AQI (US)
30AQI (US)
33AQI (US)
90AQI (US)
146AQI (US)
100AQI (US)
52AQI (US)
56AQI (US)
46AQI (US)
48AQI (US)
45AQI (US)
39AQI (US)
42AQI (US)
43AQI (US)
51AQI (US)
42AQI (US)
44AQI (US)
54AQI (US)
50AQI (US)
49AQI (US)
47AQI (US)
44AQI (US)
42AQI (US)
45AQI (US)
46AQI (US)
42AQI (US)
42AQI (US)
42AQI (US)
49AQI (US)
50AQI (US)
42AQI (US)
46AQI (US)
46AQI (US)
46AQI (US)
50AQI (US)
42AQI (US)
38AQI (US)
34AQI (US)
39AQI (US)
43AQI (US)
44AQI (US)
32AQI (US)
34AQI (US)
34AQI (US)
38AQI (US)
50AQI (US)
44AQI (US)
41AQI (US)
38AQI (US)
29AQI (US)
32AQI (US)
36AQI (US)
37AQI (US)
31AQI (US)
35AQI (US)
40AQI (US)
39AQI (US)
36AQI (US)
30AQI (US)
36AQI (US)
35AQI (US)
32AQI (US)
32AQI (US)
34AQI (US)
32AQI (US)
33AQI (US)
38AQI (US)
35AQI (US)
32AQI (US)
30AQI (US)
32AQI (US)
32AQI (US)
28AQI (US)
28AQI (US)
28AQI (US)
29AQI (US)
32AQI (US)
29AQI (US)
28AQI (US)
30AQI (US)
36AQI (US)
30AQI (US)
37AQI (US)
30AQI (US)
35AQI (US)
36AQI (US)
31AQI (US)
29AQI (US)
32AQI (US)
30AQI (US)
32AQI (US)
32AQI (US)
34AQI (US)
33AQI (US)
27AQI (US)
24AQI (US)
27AQI (US)
30AQI (US)
34AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
30AQI (US)
34AQI (US)
34AQI (US)
30AQI (US)
28AQI (US)
32AQI (US)
34AQI (US)
36AQI (US)
36AQI (US)
30AQI (US)
52AQI (US)
54AQI (US)
42AQI (US)
40AQI (US)
53AQI (US)
56AQI (US)
48AQI (US)
53AQI (US)
58AQI (US)
58AQI (US)
72AQI (US)
108AQI (US)
95AQI (US)
72AQI (US)
74AQI (US)
97AQI (US)
86AQI (US)
63AQI (US)
91AQI (US)
66AQI (US)
64AQI (US)
90AQI (US)
119AQI (US)
82AQI (US)
67AQI (US)
68AQI (US)
46AQI (US)
73AQI (US)
74AQI (US)
66AQI (US)
50AQI (US)
82AQI (US)
111AQI (US)
110AQI (US)
87AQI (US)
110AQI (US)
51AQI (US)
48AQI (US)
73AQI (US)
48AQI (US)
79AQI (US)
76AQI (US)
81AQI (US)
59AQI (US)
62AQI (US)
50AQI (US)
52AQI (US)
75AQI (US)
109AQI (US)
138AQI (US)
142AQI (US)
128AQI (US)
140AQI (US)
138AQI (US)
103AQI (US)
77AQI (US)
38AQI (US)
49AQI (US)
87AQI (US)
82AQI (US)
58AQI (US)
32AQI (US)
34AQI (US)
46AQI (US)
33AQI (US)
43AQI (US)
62AQI (US)
52AQI (US)
24AQI (US)
32AQI (US)
56AQI (US)
45AQI (US)
26AQI (US)
30AQI (US)
30AQI (US)
94AQI (US)
42AQI (US)
28AQI (US)
22AQI (US)
30AQI (US)
36AQI (US)
38AQI (US)
78AQI (US)
48AQI (US)
74AQI (US)
44AQI (US)
70AQI (US)
82AQI (US)
74AQI (US)
81AQI (US)
130AQI (US)
53AQI (US)
33AQI (US)
42AQI (US)
50AQI (US)
87AQI (US)
76AQI (US)
78AQI (US)
38AQI (US)
82AQI (US)
125AQI (US)
128AQI (US)
53AQI (US)
30AQI (US)
42AQI (US)
29AQI (US)
38AQI (US)
67AQI (US)
45AQI (US)
78AQI (US)
52AQI (US)
50AQI (US)
27AQI (US)
28AQI (US)
45AQI (US)
40AQI (US)
74AQI (US)
82AQI (US)
80AQI (US)
38AQI (US)
52AQI (US)
44AQI (US)
64AQI (US)
42AQI (US)
64AQI (US)
40AQI (US)
62AQI (US)
51AQI (US)
21AQI (US)
43AQI (US)
29AQI (US)
41AQI (US)
38AQI (US)
30AQI (US)
43AQI (US)
47AQI (US)
34AQI (US)
38AQI (US)
34AQI (US)
58AQI (US)
36AQI (US)
43AQI (US)
43AQI (US)
35AQI (US)
31AQI (US)
51AQI (US)
73AQI (US)
67AQI (US)
61AQI (US)
47AQI (US)
47AQI (US)
No. of days
202650AQI (US)
Highest AQI (US) recorded in
June73AQI (US)
Lowest AQI (US) recorded in
April31AQI (US)
202556AQI (US)
Highest AQI (US) recorded in
June107AQI (US)
Lowest AQI (US) recorded in
December28AQI (US)
202459AQI (US)
Highest AQI (US) recorded in
May118AQI (US)
Lowest AQI (US) recorded in
November27AQI (US)
202361AQI (US)
Highest AQI (US) recorded in
February93AQI (US)
Lowest AQI (US) recorded in
January27AQI (US)
202256AQI (US)
Highest AQI (US) recorded in
May100AQI (US)
Lowest AQI (US) recorded in
December26AQI (US)
202169AQI (US)
Highest AQI (US) recorded in
May125AQI (US)
Lowest AQI (US) recorded in
January32AQI (US)
202061AQI (US)
Highest AQI (US) recorded in
July106AQI (US)
Lowest AQI (US) recorded in
December27AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Chillan's annual 2026 AQI (US) (50) shows an average percentage change of -16.7% (improved AQI (US)) compared to previous years: 2020 (61), 2021 (69), 2022 (56), 2023 (61), 2024 (59), 2025 (56).