Oroville, California, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Oroville, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (30th July ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 2nd highest AQI at 33 of Good air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Jul - 31st Jul 2025
Oroville, California, United States
5 AM30th Jul 2025
8 PM
4 AM31st Jul 2025
38AQI
29AQI
35AQI
30AQI
In the last 24 hours,
Oroville's AQI reached its highest point of 38 at 11 AM during the Day, while the lowest point, 29, was recorded at 6 AM during the Day between 30th Jul and 31st Jul 2025.
Day & Night AQI Trend : Jul 2025
Oroville, California, United States
30°C21/40°C
30°C20/40°C
27°C19/35°C
24°C15/33°C
24°C14/34°C
27°C18/37°C
29°C20/39°C
26°C17/36°C
26°C16/36°C
31°C20/41°C
33°C24/42°C
32°C22/42°C
31°C18/42°C
31°C19/42°C
28°C19/38°C
26°C15/36°C
26°C14/37°C
28°C17/38°C
28°C17/39°C
27°C17/38°C
23°C15/32°C
23°C14/32°C
23°C14/34°C
25°C15/35°C
25°C15/35°C
24°C13/33°C
25°C14/35°C
27°C16/37°C
29°C20/38°C
27°C17/38°C
--°C/°C
34AQI
31AQI
35AQI
32AQI
2025 Days Vs Air Quality
Oroville, California, United States
95%
201
5%
10
Total number of days with different AQI categories in last 212 days in 2025 (153 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 212 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
Oroville, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
56AQI
40AQI
39AQI
24AQI
30AQI
28AQI
25AQI
26AQI
30AQI
38AQI
32AQI
27AQI
25AQI
27AQI
42AQI
43AQI
46AQI
49AQI
51AQI
37AQI
37AQI
42AQI
54AQI
55AQI
39AQI
33AQI
28AQI
48AQI
58AQI
68AQI
55AQI
37AQI
23AQI
22AQI
21AQI
26AQI
30AQI
25AQI
26AQI
28AQI
27AQI
34AQI
40AQI
28AQI
25AQI
26AQI
31AQI
27AQI
28AQI
27AQI
26AQI
24AQI
41AQI
32AQI
31AQI
24AQI
25AQI
30AQI
29AQI
29AQI
24AQI
21AQI
22AQI
24AQI
23AQI
26AQI
28AQI
33AQI
31AQI
30AQI
25AQI
20AQI
18AQI
31AQI
33AQI
15AQI
17AQI
20AQI
16AQI
19AQI
20AQI
19AQI
23AQI
28AQI
30AQI
17AQI
21AQI
17AQI
26AQI
20AQI
17AQI
18AQI
21AQI
23AQI
22AQI
27AQI
15AQI
15AQI
20AQI
23AQI
26AQI
24AQI
26AQI
23AQI
37AQI
36AQI
27AQI
29AQI
28AQI
33AQI
29AQI
33AQI
42AQI
47AQI
28AQI
27AQI
21AQI
21AQI
29AQI
33AQI
23AQI
34AQI
22AQI
23AQI
24AQI
23AQI
41AQI
40AQI
37AQI
31AQI
29AQI
18AQI
15AQI
18AQI
22AQI
24AQI
25AQI
21AQI
19AQI
17AQI
21AQI
25AQI
22AQI
31AQI
28AQI
18AQI
25AQI
33AQI
31AQI
36AQI
39AQI
38AQI
44AQI
41AQI
38AQI
41AQI
35AQI
38AQI
30AQI
32AQI
34AQI
41AQI
48AQI
49AQI
41AQI
36AQI
37AQI
38AQI
34AQI
32AQI
40AQI
22AQI
18AQI
21AQI
26AQI
28AQI
31AQI
36AQI
34AQI
36AQI
33AQI
34AQI
35AQI
42AQI
33AQI
53AQI
35AQI
29AQI
29AQI
25AQI
40AQI
59AQI
59AQI
50AQI
42AQI
38AQI
32AQI
28AQI
28AQI
32AQI
26AQI
30AQI
21AQI
21AQI
22AQI
22AQI
20AQI
20AQI
25AQI
31AQI
33AQI
40AQI
28AQI
23AQI
27AQI
26AQI
35AQI
33AQI
No. of days
202530AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
March23AQI
202435AQI
Highest AQI recorded in
October41AQI
Lowest AQI recorded in
March8AQI
202343AQI
Highest AQI recorded in
November60AQI
Lowest AQI recorded in
December41AQI
202245AQI
Highest AQI recorded in
November50AQI
Lowest AQI recorded in
December25AQI
202178AQI
Highest AQI recorded in
July106AQI
Lowest AQI recorded in
September47AQI
2020168AQI
Highest AQI recorded in
September173AQI
Lowest AQI recorded in
October126AQI
Most & Least Polluted Years Over the Last 6 Years
Oroville's annual 2025 AQI (30) shows an average percentage change of -43.3% (improved AQI) compared to previous years: 2020 (168), 2021 (78), 2022 (45), 2023 (43), 2024 (35).