Shasta Lake, California, United States 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
Shasta Lake, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (2nd September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 47 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Sep - 4th Sep 2025
Shasta Lake, California, United States
6 AM3rd Sep 2025
7 PM
5 AM4th Sep 2025
55AQI
47AQI
53AQI
32AQI
In the last 24 hours,
Shasta Lake's AQI reached its highest point of 55 at 1 PM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 3rd Sep and 4th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Shasta Lake, California, United States
22°C16/29°C
22°C15/29°C
22°C14/30°C
24°C14/32°C
26°C16/35°C
28°C18/36°C
29°C20/37°C
29°C23/36°C
26°C19/33°C
24°C17/31°C
23°C17/31°C
22°C17/29°C
20°C16/25°C
19°C13/27°C
20°C13/29°C
23°C16/31°C
26°C17/35°C
26°C17/35°C
27°C19/36°C
27°C20/35°C
25°C15/34°C
25°C18/33°C
24°C18/31°C
23°C17/31°C
24°C18/31°C
25°C18/32°C
24°C17/32°C
24°C17/33°C
25°C16/33°C
22°C15/33°C
--°C/°C
39AQI
32AQI
32AQI
31AQI
2025 Days Vs Air Quality
Shasta Lake, California, United States
97%
238
3%
7
Total number of days with different AQI categories in last 247 days in 2025 (118 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 247 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
Shasta Lake, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
54AQI
56AQI
36AQI
31AQI
39AQI
30AQI
27AQI
32AQI
45AQI
44AQI
31AQI
36AQI
31AQI
50AQI
52AQI
47AQI
46AQI
52AQI
49AQI
35AQI
42AQI
46AQI
48AQI
51AQI
32AQI
33AQI
44AQI
49AQI
51AQI
54AQI
44AQI
32AQI
24AQI
27AQI
27AQI
27AQI
37AQI
26AQI
39AQI
40AQI
30AQI
40AQI
45AQI
36AQI
26AQI
25AQI
31AQI
30AQI
38AQI
36AQI
34AQI
31AQI
39AQI
26AQI
26AQI
24AQI
31AQI
32AQI
34AQI
32AQI
25AQI
29AQI
34AQI
29AQI
27AQI
29AQI
30AQI
27AQI
29AQI
28AQI
24AQI
21AQI
20AQI
20AQI
21AQI
22AQI
22AQI
27AQI
20AQI
25AQI
19AQI
18AQI
25AQI
23AQI
23AQI
19AQI
22AQI
24AQI
27AQI
20AQI
24AQI
22AQI
22AQI
27AQI
26AQI
25AQI
19AQI
20AQI
22AQI
24AQI
22AQI
23AQI
27AQI
31AQI
31AQI
32AQI
27AQI
27AQI
24AQI
24AQI
21AQI
24AQI
29AQI
34AQI
25AQI
21AQI
20AQI
22AQI
23AQI
26AQI
27AQI
25AQI
21AQI
20AQI
21AQI
20AQI
27AQI
24AQI
28AQI
25AQI
19AQI
22AQI
17AQI
18AQI
20AQI
21AQI
20AQI
20AQI
21AQI
17AQI
21AQI
22AQI
23AQI
25AQI
25AQI
19AQI
21AQI
30AQI
23AQI
26AQI
27AQI
24AQI
26AQI
25AQI
25AQI
28AQI
28AQI
32AQI
30AQI
29AQI
30AQI
32AQI
34AQI
33AQI
30AQI
27AQI
26AQI
24AQI
24AQI
24AQI
28AQI
22AQI
20AQI
21AQI
24AQI
30AQI
25AQI
24AQI
24AQI
24AQI
28AQI
31AQI
27AQI
26AQI
25AQI
30AQI
28AQI
28AQI
29AQI
26AQI
33AQI
43AQI
41AQI
43AQI
45AQI
44AQI
43AQI
46AQI
36AQI
33AQI
29AQI
29AQI
27AQI
26AQI
26AQI
22AQI
22AQI
21AQI
23AQI
26AQI
27AQI
31AQI
35AQI
29AQI
27AQI
27AQI
26AQI
24AQI
22AQI
23AQI
25AQI
27AQI
31AQI
35AQI
36AQI
26AQI
27AQI
23AQI
19AQI
19AQI
22AQI
24AQI
24AQI
34AQI
44AQI
50AQI
38AQI
45AQI
50AQI
44AQI
38AQI
42AQI
40AQI
39AQI
47AQI
42AQI
32AQI
25AQI
25AQI
22AQI
27AQI
31AQI
31AQI
43AQI
No. of days
202530AQI
Highest AQI recorded in
September43AQI
Lowest AQI recorded in
May22AQI
202430AQI
Highest AQI recorded in
December39AQI
Lowest AQI recorded in
April8AQI
202310AQI
Highest AQI recorded in
December10AQI
Lowest AQI recorded in
November10AQI
202125AQI
Highest AQI recorded in
September25AQI
Lowest AQI recorded in
September25AQI
2020107AQI
Highest AQI recorded in
September107AQI
Lowest AQI recorded in
September107AQI
Most & Least Polluted Years Over the Last 5 Years
Shasta Lake's annual 2025 AQI (30) shows an average percentage change of 35.5% (worsened AQI) compared to previous years: 2020 (107), 2021 (25), 2023 (10), 2024 (30).