Lassen Volcanic NP, Summertown, 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
Lassen Volcanic NP, Summertown, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 48 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Lassen Volcanic NP, Summertown, California, United States
7 AM18th Oct 2025
6 PM
6 AM19th Oct 2025
61AQI
35AQI
61AQI
20AQI
In the last 24 hours,
Lassen Volcanic NP's AQI reached its highest point of 61 at 7 AM during the Day, while the lowest point, 20, was recorded at 9 PM during the Night between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Lassen Volcanic NP, Summertown, California, United States
16°C13/20°C
16°C12/21°C
18°C12/25°C
18°C9/27°C
21°C13/30°C
21°C14/29°C
19°C12/27°C
19°C11/26°C
19°C11/27°C
16°C11/22°C
13°C9/19°C
11°C8/15°C
11°C7/16°C
10°C6/16°C
10°C7/14°C
10°C4/17°C
12°C5/20°C
13°C5/22°C
15°C8/23°C
13°C7/22°C
11°C6/18°C
9°C5/14°C
6°C2/11°C
7°C1/14°C
5°C2/10°C
6°C1/13°C
7°C3/13°C
9°C1/17°C
13°C6/21°C
13°C5/21°C
--°C/°C
33AQI
26AQI
36AQI
29AQI
2025 Days Vs Air Quality
Lassen Volcanic NP, Summertown, California, United States
99%
205
0.9%
2
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 99%
Health Risk Level:
Very Low
In 2025, 99% 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
Lassen Volcanic NP, Summertown, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
18AQI
21AQI
31AQI
34AQI
23AQI
22AQI
18AQI
19AQI
19AQI
19AQI
22AQI
20AQI
19AQI
32AQI
37AQI
36AQI
29AQI
26AQI
27AQI
25AQI
24AQI
24AQI
20AQI
20AQI
20AQI
20AQI
24AQI
25AQI
27AQI
27AQI
23AQI
22AQI
17AQI
19AQI
23AQI
18AQI
23AQI
23AQI
18AQI
17AQI
16AQI
19AQI
20AQI
23AQI
24AQI
25AQI
24AQI
23AQI
22AQI
18AQI
19AQI
20AQI
18AQI
19AQI
17AQI
22AQI
22AQI
23AQI
23AQI
23AQI
20AQI
22AQI
27AQI
25AQI
30AQI
27AQI
24AQI
24AQI
26AQI
23AQI
25AQI
28AQI
35AQI
31AQI
30AQI
28AQI
28AQI
28AQI
28AQI
27AQI
24AQI
21AQI
26AQI
28AQI
26AQI
33AQI
33AQI
28AQI
26AQI
27AQI
34AQI
34AQI
38AQI
37AQI
38AQI
37AQI
37AQI
34AQI
31AQI
25AQI
33AQI
29AQI
27AQI
25AQI
27AQI
36AQI
45AQI
46AQI
48AQI
49AQI
40AQI
43AQI
47AQI
38AQI
33AQI
28AQI
23AQI
20AQI
25AQI
32AQI
31AQI
32AQI
31AQI
38AQI
41AQI
38AQI
44AQI
29AQI
24AQI
23AQI
30AQI
34AQI
30AQI
28AQI
26AQI
25AQI
25AQI
26AQI
29AQI
29AQI
33AQI
30AQI
27AQI
23AQI
19AQI
18AQI
24AQI
30AQI
35AQI
34AQI
43AQI
37AQI
37AQI
34AQI
35AQI
37AQI
38AQI
42AQI
39AQI
34AQI
37AQI
38AQI
47AQI
52AQI
40AQI
23AQI
19AQI
17AQI
17AQI
21AQI
20AQI
21AQI
21AQI
21AQI
22AQI
26AQI
25AQI
23AQI
20AQI
20AQI
21AQI
19AQI
47AQI
37AQI
29AQI
40AQI
32AQI
27AQI
23AQI
22AQI
33AQI
26AQI
26AQI
51AQI
30AQI
36AQI
47AQI
45AQI
31AQI
29AQI
30AQI
31AQI
27AQI
42AQI
45AQI
48AQI
24AQI
24AQI
22AQI
29AQI
35AQI
30AQI
29AQI
35AQI
No. of days
202528AQI
Highest AQI recorded in
July35AQI
Lowest AQI recorded in
May22AQI
Most & Least Polluted Years Over the Last 1 Years
Lassen Volcanic NP's annual 2025 AQI (28) shows an average percentage change of NaN% (improved AQI) compared to previous years: .