North Gulling Street, Portola, 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
North Gulling Street, Portola, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (22nd October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 62 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Oct - 23rd Oct 2025
North Gulling Street, Portola, California, United States
7 AM22nd Oct 2025
6 PM
6 AM23rd Oct 2025
70AQI
31AQI
78AQI
36AQI
In the last 24 hours,
North Gulling Street's AQI reached its highest point of 78 at 1 AM during the Night, while the lowest point, 31, was recorded at 5 PM during the Day between 22nd Oct and 23rd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
North Gulling Street, Portola, California, United States
18°C10/27°C
20°C11/30°C
18°C11/26°C
18°C10/26°C
17°C10/27°C
15°C10/21°C
13°C8/17°C
8°C6/13°C
10°C5/15°C
9°C5/13°C
7°C4/12°C
10°C5/17°C
8°C2/16°C
9°C2/18°C
13°C4/21°C
13°C6/21°C
11°C6/19°C
8°C4/13°C
6°C2/10°C
7°C2/16°C
6°C3/10°C
6°C2/10°C
4°C-1/8°C
7°C1/15°C
11°C3/19°C
13°C5/22°C
12°C8/18°C
10°C4/18°C
12°C5/23°C
11°C6/19°C
--°C/°C
43AQI
25AQI
45AQI
26AQI
2025 Days Vs Air Quality
North Gulling Street, Portola, California, United States
94%
199
6%
12
Total number of days with different AQI categories in last 296 days in 2025 (69 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 296 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
North Gulling Street, Portola, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
22AQI
34AQI
44AQI
44AQI
28AQI
35AQI
25AQI
53AQI
51AQI
40AQI
32AQI
23AQI
36AQI
42AQI
45AQI
40AQI
29AQI
33AQI
40AQI
40AQI
45AQI
36AQI
29AQI
34AQI
34AQI
29AQI
29AQI
41AQI
43AQI
38AQI
40AQI
27AQI
27AQI
37AQI
33AQI
25AQI
26AQI
25AQI
21AQI
17AQI
19AQI
20AQI
28AQI
25AQI
25AQI
21AQI
26AQI
35AQI
36AQI
24AQI
27AQI
28AQI
29AQI
24AQI
21AQI
28AQI
25AQI
23AQI
25AQI
25AQI
24AQI
22AQI
26AQI
28AQI
32AQI
27AQI
29AQI
23AQI
25AQI
27AQI
28AQI
31AQI
34AQI
32AQI
29AQI
34AQI
29AQI
29AQI
32AQI
28AQI
26AQI
25AQI
28AQI
30AQI
26AQI
29AQI
48AQI
44AQI
41AQI
33AQI
34AQI
30AQI
34AQI
36AQI
33AQI
35AQI
34AQI
37AQI
29AQI
24AQI
29AQI
27AQI
29AQI
25AQI
27AQI
39AQI
57AQI
54AQI
55AQI
55AQI
41AQI
37AQI
40AQI
39AQI
30AQI
28AQI
24AQI
21AQI
22AQI
22AQI
23AQI
22AQI
21AQI
24AQI
25AQI
24AQI
31AQI
25AQI
27AQI
23AQI
25AQI
32AQI
36AQI
31AQI
33AQI
27AQI
26AQI
28AQI
36AQI
35AQI
37AQI
33AQI
30AQI
21AQI
21AQI
25AQI
30AQI
33AQI
29AQI
30AQI
32AQI
30AQI
32AQI
36AQI
25AQI
26AQI
31AQI
39AQI
30AQI
29AQI
42AQI
36AQI
39AQI
36AQI
33AQI
28AQI
26AQI
26AQI
20AQI
21AQI
24AQI
24AQI
22AQI
20AQI
20AQI
22AQI
27AQI
24AQI
29AQI
20AQI
19AQI
18AQI
33AQI
29AQI
27AQI
32AQI
25AQI
18AQI
19AQI
21AQI
24AQI
28AQI
39AQI
52AQI
36AQI
39AQI
36AQI
31AQI
28AQI
56AQI
28AQI
50AQI
36AQI
49AQI
49AQI
57AQI
53AQI
51AQI
37AQI
62AQI
33AQI
36AQI
25AQI
31AQI
32AQI
30AQI
27AQI
40AQI
No. of days
202531AQI
Highest AQI recorded in
October40AQI
Lowest AQI recorded in
May25AQI
Most & Least Polluted Years Over the Last 1 Years
North Gulling Street's annual 2025 AQI (31) shows an average percentage change of NaN% (improved AQI) compared to previous years: .