Folsom, California, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Folsom, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (10th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 34 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: 10th Aug - 11th Aug 2025
Folsom, California, United States
6 AM10th Aug 2025
8 PM
5 AM11th Aug 2025
42AQI
30AQI
40AQI
30AQI
In the last 24 hours,
Folsom's AQI reached its highest point of 42 at 6 PM during the Day, while the lowest point, 30, was recorded at 3 AM during the Night between 10th Aug and 11th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Folsom, California, United States
29°C19/41°C
27°C16/41°C
28°C17/42°C
25°C16/37°C
23°C14/34°C
24°C14/37°C
26°C15/38°C
25°C14/38°C
24°C16/37°C
22°C14/31°C
20°C15/28°C
22°C14/33°C
23°C14/34°C
22°C14/34°C
21°C14/32°C
22°C15/34°C
26°C15/37°C
28°C18/39°C
25°C16/37°C
26°C16/39°C
27°C16/39°C
26°C16/38°C
26°C16/37°C
24°C15/35°C
25°C16/35°C
28°C18/39°C
30°C21/40°C
31°C20/42°C
31°C21/43°C
31°C20/43°C
--°C/°C
30AQI
27AQI
30AQI
27AQI
2025 Days Vs Air Quality
Folsom, California, United States
95%
211
5%
11
Total number of days with different AQI categories in last 223 days in 2025 (142 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 223 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
Folsom, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
49AQI
50AQI
48AQI
25AQI
33AQI
35AQI
23AQI
37AQI
44AQI
43AQI
34AQI
26AQI
34AQI
31AQI
39AQI
38AQI
43AQI
57AQI
56AQI
45AQI
38AQI
47AQI
49AQI
50AQI
58AQI
32AQI
29AQI
47AQI
51AQI
57AQI
54AQI
35AQI
23AQI
22AQI
24AQI
26AQI
25AQI
25AQI
24AQI
28AQI
31AQI
36AQI
36AQI
27AQI
27AQI
26AQI
28AQI
26AQI
25AQI
23AQI
24AQI
26AQI
34AQI
32AQI
29AQI
22AQI
28AQI
33AQI
36AQI
31AQI
26AQI
22AQI
23AQI
27AQI
25AQI
26AQI
27AQI
31AQI
30AQI
33AQI
27AQI
20AQI
18AQI
39AQI
38AQI
16AQI
17AQI
20AQI
16AQI
21AQI
22AQI
27AQI
26AQI
28AQI
27AQI
23AQI
26AQI
20AQI
25AQI
24AQI
19AQI
17AQI
22AQI
22AQI
24AQI
29AQI
17AQI
17AQI
21AQI
30AQI
24AQI
29AQI
35AQI
32AQI
36AQI
39AQI
25AQI
28AQI
29AQI
33AQI
32AQI
36AQI
47AQI
45AQI
24AQI
24AQI
22AQI
25AQI
38AQI
46AQI
45AQI
40AQI
23AQI
34AQI
24AQI
24AQI
51AQI
43AQI
38AQI
33AQI
28AQI
18AQI
20AQI
19AQI
25AQI
36AQI
31AQI
30AQI
23AQI
23AQI
31AQI
31AQI
27AQI
38AQI
29AQI
22AQI
28AQI
35AQI
31AQI
41AQI
42AQI
46AQI
54AQI
45AQI
50AQI
44AQI
35AQI
37AQI
31AQI
29AQI
34AQI
45AQI
52AQI
49AQI
42AQI
39AQI
41AQI
40AQI
39AQI
40AQI
44AQI
32AQI
27AQI
29AQI
29AQI
33AQI
33AQI
40AQI
44AQI
39AQI
33AQI
34AQI
38AQI
45AQI
35AQI
48AQI
38AQI
30AQI
26AQI
25AQI
33AQI
53AQI
56AQI
44AQI
34AQI
29AQI
28AQI
23AQI
25AQI
28AQI
25AQI
29AQI
19AQI
18AQI
18AQI
18AQI
17AQI
18AQI
21AQI
24AQI
29AQI
32AQI
36AQI
33AQI
33AQI
39AQI
29AQI
32AQI
29AQI
30AQI
37AQI
34AQI
42AQI
28AQI
25AQI
29AQI
31AQI
39AQI
30AQI
33AQI
No. of days
202532AQI
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
March25AQI
202430AQI
Highest AQI recorded in
December39AQI
Lowest AQI recorded in
February24AQI
202334AQI
Highest AQI recorded in
February40AQI
Lowest AQI recorded in
November21AQI
202234AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
July29AQI
202146AQI
Highest AQI recorded in
August76AQI
Lowest AQI recorded in
December30AQI
Most & Least Polluted Years Over the Last 5 Years
Folsom's annual 2025 AQI (32) shows an average percentage change of -8.3% (improved AQI) compared to previous years: 2021 (46), 2022 (34), 2023 (34), 2024 (30).