Mount Shasta, 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
Mount Shasta, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th October ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 42 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Oct - 30th Oct 2025
Mount Shasta, California, United States
7 AM29th Oct 2025
6 PM
6 AM30th Oct 2025
54AQI
25AQI
35AQI
23AQI
In the last 24 hours,
Mount Shasta's AQI reached its highest point of 54 at 10 AM during the Day, while the lowest point, 23, was recorded at 12 AM during the Night between 29th Oct and 30th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Mount Shasta, California, United States
12°C10/15°C
11°C10/13°C
13°C9/18°C
13°C10/19°C
12°C6/21°C
14°C7/23°C
15°C7/26°C
16°C6/26°C
15°C5/25°C
13°C10/16°C
11°C7/14°C
8°C2/15°C
9°C3/16°C
7°C3/11°C
10°C4/19°C
8°C6/13°C
12°C4/22°C
14°C5/24°C
14°C4/24°C
12°C6/19°C
12°C5/22°C
13°C3/24°C
13°C3/24°C
13°C4/23°C
10°C3/17°C
10°C6/12°C
6°C4/9°C
6°C1/13°C
10°C3/19°C
12°C6/20°C
--°C/°C
37AQI
31AQI
37AQI
29AQI
2025 Days Vs Air Quality
Mount Shasta, California, United States
97%
293
3%
9
Total number of days with different AQI categories in last 303 days in 2025 (62 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 303 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
Mount Shasta, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
40AQI
40AQI
31AQI
27AQI
33AQI
27AQI
28AQI
31AQI
42AQI
40AQI
28AQI
32AQI
29AQI
47AQI
52AQI
48AQI
46AQI
50AQI
45AQI
32AQI
44AQI
45AQI
44AQI
46AQI
28AQI
40AQI
51AQI
53AQI
50AQI
53AQI
42AQI
28AQI
24AQI
26AQI
27AQI
27AQI
34AQI
26AQI
37AQI
37AQI
28AQI
38AQI
43AQI
33AQI
27AQI
25AQI
29AQI
29AQI
33AQI
37AQI
32AQI
33AQI
33AQI
23AQI
23AQI
22AQI
28AQI
28AQI
33AQI
33AQI
25AQI
30AQI
33AQI
30AQI
30AQI
27AQI
28AQI
24AQI
28AQI
28AQI
20AQI
20AQI
19AQI
19AQI
19AQI
21AQI
22AQI
23AQI
18AQI
25AQI
18AQI
18AQI
21AQI
23AQI
27AQI
21AQI
24AQI
26AQI
29AQI
22AQI
27AQI
22AQI
25AQI
30AQI
24AQI
24AQI
17AQI
20AQI
21AQI
22AQI
23AQI
22AQI
25AQI
27AQI
31AQI
30AQI
27AQI
26AQI
22AQI
25AQI
20AQI
25AQI
26AQI
33AQI
31AQI
22AQI
21AQI
21AQI
20AQI
23AQI
26AQI
27AQI
24AQI
20AQI
21AQI
18AQI
22AQI
27AQI
24AQI
25AQI
21AQI
24AQI
19AQI
17AQI
19AQI
23AQI
20AQI
22AQI
22AQI
19AQI
23AQI
20AQI
25AQI
26AQI
26AQI
19AQI
21AQI
30AQI
23AQI
26AQI
27AQI
29AQI
23AQI
23AQI
24AQI
29AQI
28AQI
32AQI
29AQI
30AQI
29AQI
34AQI
35AQI
34AQI
30AQI
28AQI
26AQI
26AQI
23AQI
30AQI
30AQI
27AQI
26AQI
21AQI
25AQI
30AQI
26AQI
24AQI
23AQI
24AQI
27AQI
31AQI
32AQI
28AQI
27AQI
29AQI
31AQI
29AQI
29AQI
30AQI
40AQI
39AQI
38AQI
41AQI
41AQI
44AQI
49AQI
53AQI
44AQI
37AQI
30AQI
29AQI
34AQI
28AQI
30AQI
25AQI
25AQI
22AQI
25AQI
27AQI
27AQI
29AQI
31AQI
31AQI
29AQI
26AQI
25AQI
25AQI
23AQI
22AQI
24AQI
25AQI
28AQI
34AQI
33AQI
31AQI
28AQI
24AQI
20AQI
19AQI
22AQI
26AQI
24AQI
36AQI
44AQI
50AQI
34AQI
44AQI
49AQI
43AQI
38AQI
43AQI
42AQI
38AQI
44AQI
40AQI
40AQI
50AQI
48AQI
48AQI
42AQI
27AQI
23AQI
22AQI
36AQI
41AQI
31AQI
21AQI
21AQI
26AQI
29AQI
27AQI
31AQI
23AQI
18AQI
22AQI
24AQI
47AQI
38AQI
25AQI
58AQI
49AQI
26AQI
20AQI
21AQI
21AQI
26AQI
22AQI
25AQI
36AQI
52AQI
36AQI
38AQI
28AQI
31AQI
30AQI
35AQI
25AQI
26AQI
32AQI
43AQI
38AQI
40AQI
39AQI
49AQI
53AQI
58AQI
34AQI
25AQI
24AQI
39AQI
42AQI
40AQI
30AQI
24AQI
24AQI
23AQI
28AQI
33AQI
31AQI
34AQI
34AQI
No. of days
202530AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
May23AQI
202431AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
March13AQI
202314AQI
Highest AQI recorded in
November15AQI
Lowest AQI recorded in
December14AQI
202165AQI
Highest AQI recorded in
August121AQI
Lowest AQI recorded in
October26AQI
202075AQI
Highest AQI recorded in
September91AQI
Lowest AQI recorded in
August57AQI
Most & Least Polluted Years Over the Last 5 Years
Mount Shasta's annual 2025 AQI (30) shows an average percentage change of -1.01% (improved AQI) compared to previous years: 2020 (75), 2021 (65), 2023 (14), 2024 (31).