Chiriaco Summit, California, United States 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
Chiriaco Summit, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 37 of Good air quality, showing improvement over 2024 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Chiriaco Summit, California, United States
6 AM18th Oct 2025
6 PM
5 AM19th Oct 2025
54AQI
22AQI
54AQI
12AQI
In the last 24 hours,
Chiriaco Summit's AQI reached its highest point of 54 at 11 AM during the Day, while the lowest point, 12, was recorded at 7 PM during the Night between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Chiriaco Summit, California, United States
27°C20/34°C
28°C19/37°C
27°C21/33°C
28°C23/35°C
30°C23/37°C
33°C26/39°C
32°C27/39°C
28°C24/33°C
24°C20/28°C
26°C20/31°C
27°C22/34°C
28°C22/35°C
27°C21/34°C
28°C20/37°C
27°C21/34°C
24°C18/30°C
25°C18/32°C
25°C18/33°C
26°C19/34°C
26°C18/36°C
27°C21/35°C
25°C22/32°C
25°C21/33°C
25°C18/31°C
23°C17/30°C
20°C15/24°C
19°C13/24°C
20°C13/27°C
22°C15/29°C
22°C14/30°C
--°C/°C
42AQI
30AQI
40AQI
33AQI
2025 Days Vs Air Quality
Chiriaco Summit, California, United States
92%
268
8%
23
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 292 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Chiriaco Summit, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
45AQI
37AQI
42AQI
43AQI
37AQI
36AQI
36AQI
47AQI
39AQI
38AQI
37AQI
32AQI
33AQI
31AQI
32AQI
34AQI
32AQI
36AQI
39AQI
40AQI
36AQI
37AQI
32AQI
36AQI
45AQI
43AQI
49AQI
42AQI
44AQI
43AQI
45AQI
42AQI
43AQI
37AQI
38AQI
34AQI
34AQI
29AQI
31AQI
33AQI
33AQI
32AQI
32AQI
29AQI
31AQI
31AQI
31AQI
33AQI
33AQI
32AQI
34AQI
31AQI
31AQI
32AQI
33AQI
34AQI
32AQI
33AQI
33AQI
36AQI
36AQI
37AQI
34AQI
36AQI
34AQI
32AQI
32AQI
33AQI
32AQI
33AQI
31AQI
24AQI
22AQI
23AQI
29AQI
27AQI
31AQI
29AQI
30AQI
29AQI
31AQI
30AQI
27AQI
26AQI
36AQI
37AQI
34AQI
35AQI
38AQI
33AQI
35AQI
29AQI
26AQI
27AQI
24AQI
27AQI
25AQI
29AQI
25AQI
33AQI
31AQI
34AQI
32AQI
35AQI
37AQI
39AQI
36AQI
30AQI
28AQI
26AQI
26AQI
27AQI
34AQI
34AQI
36AQI
35AQI
30AQI
28AQI
28AQI
30AQI
30AQI
31AQI
38AQI
29AQI
30AQI
28AQI
29AQI
29AQI
29AQI
30AQI
31AQI
34AQI
35AQI
30AQI
31AQI
35AQI
41AQI
38AQI
37AQI
38AQI
41AQI
47AQI
47AQI
49AQI
47AQI
50AQI
47AQI
50AQI
48AQI
48AQI
43AQI
41AQI
36AQI
35AQI
35AQI
35AQI
36AQI
38AQI
39AQI
40AQI
40AQI
43AQI
42AQI
44AQI
45AQI
42AQI
47AQI
40AQI
48AQI
53AQI
50AQI
51AQI
51AQI
50AQI
52AQI
51AQI
50AQI
50AQI
48AQI
43AQI
38AQI
38AQI
38AQI
40AQI
44AQI
49AQI
42AQI
37AQI
36AQI
35AQI
40AQI
49AQI
51AQI
52AQI
54AQI
53AQI
48AQI
42AQI
40AQI
38AQI
37AQI
38AQI
37AQI
33AQI
31AQI
27AQI
28AQI
30AQI
32AQI
36AQI
35AQI
29AQI
28AQI
36AQI
56AQI
54AQI
53AQI
52AQI
52AQI
51AQI
48AQI
52AQI
52AQI
48AQI
51AQI
45AQI
43AQI
37AQI
29AQI
25AQI
31AQI
36AQI
32AQI
39AQI
47AQI
46AQI
42AQI
35AQI
29AQI
30AQI
29AQI
39AQI
43AQI
30AQI
35AQI
30AQI
35AQI
33AQI
29AQI
24AQI
23AQI
22AQI
23AQI
25AQI
27AQI
30AQI
36AQI
36AQI
35AQI
30AQI
28AQI
25AQI
24AQI
25AQI
25AQI
28AQI
27AQI
35AQI
38AQI
19AQI
26AQI
40AQI
36AQI
43AQI
38AQI
54AQI
51AQI
39AQI
34AQI
39AQI
51AQI
49AQI
42AQI
30AQI
34AQI
52AQI
55AQI
18AQI
23AQI
24AQI
37AQI
39AQI
33AQI
32AQI
31AQI
38AQI
44AQI
39AQI
42AQI
29AQI
40AQI
No. of days
202536AQI
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
September29AQI
202437AQI
Highest AQI recorded in
October44AQI
Lowest AQI recorded in
January30AQI
202335AQI
Highest AQI recorded in
June43AQI
Lowest AQI recorded in
December28AQI
202234AQI
Highest AQI recorded in
May43AQI
Lowest AQI recorded in
December27AQI
202134AQI
Highest AQI recorded in
May42AQI
Lowest AQI recorded in
January26AQI
202036AQI
Highest AQI recorded in
September46AQI
Lowest AQI recorded in
December26AQI
Most & Least Polluted Years Over the Last 6 Years
Chiriaco Summit's annual 2025 AQI (36) shows an average percentage change of 3.7% (worsened AQI) compared to previous years: 2020 (36), 2021 (34), 2022 (34), 2023 (35), 2024 (37).