Felton, 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
Felton, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (29th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 25 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Felton, California, United States
6 AM29th Sep 2025
7 PM
5 AM30th Sep 2025
38AQI
17AQI
60AQI
15AQI
In the last 24 hours,
Felton's AQI reached its highest point of 60 at 10 PM during the Night, while the lowest point, 15, was recorded at 6 AM during the Night between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Felton, California, United States
28°C21/39°C
27°C19/38°C
18°C15/24°C
19°C14/29°C
19°C13/29°C
18°C15/25°C
19°C13/24°C
20°C15/29°C
18°C15/23°C
19°C16/23°C
18°C16/22°C
18°C15/23°C
18°C14/23°C
18°C13/25°C
20°C14/30°C
21°C14/33°C
24°C17/32°C
25°C17/37°C
19°C16/25°C
19°C15/24°C
20°C14/30°C
22°C14/33°C
21°C12/34°C
25°C16/39°C
22°C16/31°C
22°C16/32°C
19°C14/31°C
16°C13/19°C
17°C16/20°C
18°C16/21°C
--°C/°C
45AQI
27AQI
40AQI
29AQI
2025 Days Vs Air Quality
Felton, California, United States
98%
185
2%
3
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 273 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
Felton, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI
20AQI
20AQI
18AQI
16AQI
19AQI
17AQI
18AQI
21AQI
21AQI
25AQI
24AQI
18AQI
15AQI
18AQI
23AQI
19AQI
32AQI
30AQI
28AQI
27AQI
27AQI
24AQI
26AQI
29AQI
26AQI
27AQI
27AQI
37AQI
31AQI
23AQI
14AQI
15AQI
23AQI
27AQI
26AQI
31AQI
32AQI
22AQI
41AQI
33AQI
49AQI
46AQI
35AQI
31AQI
33AQI
26AQI
22AQI
19AQI
25AQI
30AQI
36AQI
25AQI
26AQI
36AQI
24AQI
35AQI
36AQI
25AQI
29AQI
23AQI
18AQI
23AQI
29AQI
27AQI
39AQI
52AQI
47AQI
48AQI
47AQI
53AQI
41AQI
37AQI
32AQI
28AQI
23AQI
32AQI
37AQI
43AQI
44AQI
41AQI
38AQI
37AQI
36AQI
33AQI
42AQI
42AQI
33AQI
31AQI
34AQI
26AQI
26AQI
27AQI
35AQI
42AQI
35AQI
29AQI
30AQI
28AQI
41AQI
29AQI
36AQI
29AQI
28AQI
25AQI
25AQI
28AQI
38AQI
41AQI
38AQI
28AQI
27AQI
27AQI
24AQI
26AQI
25AQI
22AQI
22AQI
17AQI
16AQI
17AQI
18AQI
16AQI
17AQI
21AQI
26AQI
21AQI
26AQI
26AQI
25AQI
25AQI
30AQI
28AQI
32AQI
29AQI
32AQI
39AQI
34AQI
38AQI
36AQI
32AQI
29AQI
34AQI
24AQI
17AQI
25AQI
30AQI
35AQI
45AQI
51AQI
47AQI
39AQI
37AQI
41AQI
38AQI
38AQI
38AQI
38AQI
37AQI
34AQI
50AQI
39AQI
35AQI
32AQI
32AQI
24AQI
24AQI
24AQI
22AQI
24AQI
30AQI
31AQI
23AQI
26AQI
41AQI
46AQI
49AQI
37AQI
34AQI
30AQI
33AQI
39AQI
44AQI
38AQI
49AQI
50AQI
24AQI
25AQI
19AQI
24AQI
31AQI
37AQI
26AQI
34AQI
34AQI
No. of days
202531AQI
Highest AQI recorded in
June37AQI
Lowest AQI recorded in
March19AQI
Most & Least Polluted Years Over the Last 1 Years
Felton's annual 2025 AQI (31) shows an average percentage change of NaN% (improved AQI) compared to previous years: .