Willow Creek, Mckinleyville, 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
Willow Creek, Mckinleyville, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (20th August ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 23 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Aug - 21st Aug 2025
Willow Creek, Mckinleyville, California, United States
6 AM20th Aug 2025
8 PM
5 AM21st Aug 2025
36AQI
20AQI
21AQI
18AQI
In the last 24 hours,
Willow Creek's AQI reached its highest point of 36 at 12 PM during the Day, while the lowest point, 18, was recorded at 5 AM during the Night between 20th Aug and 21st Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Willow Creek, Mckinleyville, California, United States
20°C14/28°C
21°C12/28°C
20°C15/25°C
20°C13/27°C
18°C10/27°C
18°C9/27°C
19°C10/28°C
19°C12/29°C
21°C11/29°C
20°C12/28°C
20°C11/27°C
19°C12/25°C
17°C13/22°C
17°C13/23°C
18°C9/26°C
18°C10/26°C
21°C15/27°C
23°C15/34°C
27°C17/38°C
27°C19/37°C
26°C15/36°C
25°C18/34°C
22°C14/30°C
19°C11/26°C
18°C11/25°C
18°C16/20°C
17°C16/18°C
17°C14/23°C
18°C9/27°C
20°C11/29°C
--°C/°C
28AQI
23AQI
25AQI
23AQI
2025 Days Vs Air Quality
Willow Creek, Mckinleyville, California, United States
96%
223
4%
9
Total number of days with different AQI categories in last 233 days in 2025 (132 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2025, 96% of 233 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
Willow Creek, Mckinleyville, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
38AQI
34AQI
35AQI
26AQI
30AQI
30AQI
27AQI
33AQI
37AQI
43AQI
35AQI
43AQI
40AQI
42AQI
50AQI
48AQI
43AQI
41AQI
51AQI
43AQI
51AQI
54AQI
57AQI
53AQI
44AQI
42AQI
54AQI
59AQI
63AQI
64AQI
50AQI
38AQI
38AQI
37AQI
37AQI
33AQI
41AQI
37AQI
35AQI
34AQI
31AQI
38AQI
46AQI
35AQI
29AQI
31AQI
31AQI
34AQI
37AQI
31AQI
29AQI
38AQI
43AQI
32AQI
29AQI
28AQI
35AQI
39AQI
39AQI
38AQI
28AQI
27AQI
30AQI
27AQI
22AQI
30AQI
35AQI
29AQI
31AQI
35AQI
24AQI
22AQI
22AQI
24AQI
24AQI
20AQI
23AQI
26AQI
19AQI
21AQI
21AQI
27AQI
26AQI
31AQI
31AQI
21AQI
25AQI
25AQI
28AQI
21AQI
24AQI
23AQI
24AQI
27AQI
25AQI
27AQI
18AQI
20AQI
22AQI
22AQI
21AQI
19AQI
26AQI
31AQI
36AQI
36AQI
28AQI
29AQI
28AQI
31AQI
25AQI
26AQI
32AQI
39AQI
26AQI
26AQI
22AQI
23AQI
26AQI
28AQI
28AQI
26AQI
20AQI
19AQI
20AQI
23AQI
25AQI
24AQI
26AQI
22AQI
20AQI
19AQI
18AQI
20AQI
22AQI
22AQI
21AQI
21AQI
20AQI
17AQI
25AQI
22AQI
21AQI
26AQI
26AQI
19AQI
22AQI
29AQI
22AQI
24AQI
33AQI
31AQI
31AQI
27AQI
26AQI
29AQI
30AQI
25AQI
27AQI
29AQI
30AQI
32AQI
35AQI
38AQI
34AQI
29AQI
23AQI
20AQI
21AQI
26AQI
25AQI
18AQI
17AQI
19AQI
24AQI
28AQI
21AQI
20AQI
21AQI
22AQI
27AQI
28AQI
25AQI
22AQI
25AQI
28AQI
28AQI
28AQI
27AQI
23AQI
28AQI
39AQI
38AQI
31AQI
35AQI
43AQI
36AQI
34AQI
29AQI
34AQI
30AQI
33AQI
25AQI
25AQI
24AQI
21AQI
19AQI
19AQI
23AQI
26AQI
27AQI
28AQI
25AQI
23AQI
25AQI
27AQI
27AQI
23AQI
21AQI
23AQI
25AQI
28AQI
33AQI
35AQI
38AQI
22AQI
25AQI
19AQI
19AQI
19AQI
21AQI
23AQI
44AQI
35AQI
26AQI
26AQI
23AQI
26AQI
28AQI
25AQI
No. of days
202529AQI
Highest AQI recorded in
January44AQI
Lowest AQI recorded in
May23AQI
202433AQI
Highest AQI recorded in
March46AQI
Lowest AQI recorded in
May21AQI
202346AQI
Highest AQI recorded in
August95AQI
Lowest AQI recorded in
December45AQI
2020148AQI
Highest AQI recorded in
September148AQI
Lowest AQI recorded in
September148AQI
Most & Least Polluted Years Over the Last 4 Years
Willow Creek's annual 2025 AQI (29) shows an average percentage change of -42.3% (improved AQI) compared to previous years: 2020 (148), 2023 (46), 2024 (33).