Idaho City, Idaho, 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
Idaho City, Idaho, 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 59 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Idaho City, Idaho, United States
7 AM29th Sep 2025
7 PM
6 AM30th Sep 2025
104AQI
37AQI
57AQI
12AQI
In the last 24 hours,
Idaho City's AQI reached its highest point of 104 at 1 PM during the Day, while the lowest point, 12, was recorded at 3 AM during the Night between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Idaho City, Idaho, United States
23°C13/30°C
24°C15/32°C
25°C14/33°C
25°C16/32°C
24°C16/31°C
22°C14/29°C
20°C14/25°C
20°C12/26°C
20°C12/27°C
20°C14/26°C
18°C12/25°C
16°C10/21°C
15°C9/21°C
16°C9/23°C
16°C10/21°C
13°C8/20°C
16°C8/24°C
18°C9/25°C
19°C10/26°C
19°C11/27°C
21°C13/27°C
18°C14/24°C
14°C7/23°C
16°C8/24°C
18°C11/27°C
20°C14/27°C
16°C9/22°C
16°C9/25°C
18°C9/27°C
18°C14/23°C
--°C/°C
42AQI
40AQI
43AQI
37AQI
2025 Days Vs Air Quality
Idaho City, Idaho, United States
93%
174
7%
14
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% 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
Idaho City, Idaho, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
25AQI
32AQI
38AQI
24AQI
20AQI
27AQI
27AQI
27AQI
32AQI
34AQI
33AQI
34AQI
35AQI
30AQI
31AQI
43AQI
43AQI
35AQI
37AQI
33AQI
32AQI
32AQI
28AQI
25AQI
30AQI
29AQI
26AQI
27AQI
32AQI
31AQI
29AQI
31AQI
35AQI
32AQI
38AQI
31AQI
37AQI
32AQI
32AQI
28AQI
28AQI
24AQI
27AQI
31AQI
30AQI
31AQI
32AQI
33AQI
25AQI
26AQI
25AQI
29AQI
31AQI
29AQI
28AQI
26AQI
25AQI
25AQI
28AQI
30AQI
30AQI
32AQI
34AQI
30AQI
37AQI
29AQI
25AQI
28AQI
20AQI
17AQI
23AQI
24AQI
29AQI
31AQI
29AQI
32AQI
31AQI
31AQI
29AQI
30AQI
31AQI
26AQI
27AQI
27AQI
33AQI
30AQI
29AQI
29AQI
26AQI
24AQI
25AQI
29AQI
34AQI
32AQI
28AQI
29AQI
28AQI
33AQI
37AQI
36AQI
36AQI
36AQI
29AQI
24AQI
29AQI
27AQI
26AQI
29AQI
32AQI
36AQI
30AQI
29AQI
31AQI
32AQI
44AQI
39AQI
31AQI
28AQI
22AQI
27AQI
29AQI
30AQI
33AQI
32AQI
27AQI
26AQI
25AQI
36AQI
38AQI
36AQI
38AQI
30AQI
24AQI
26AQI
27AQI
20AQI
21AQI
24AQI
20AQI
23AQI
33AQI
34AQI
32AQI
43AQI
29AQI
31AQI
37AQI
39AQI
32AQI
43AQI
49AQI
59AQI
54AQI
54AQI
36AQI
52AQI
51AQI
51AQI
51AQI
50AQI
46AQI
48AQI
54AQI
74AQI
63AQI
53AQI
43AQI
38AQI
49AQI
38AQI
25AQI
26AQI
33AQI
24AQI
19AQI
19AQI
27AQI
30AQI
31AQI
30AQI
25AQI
22AQI
29AQI
49AQI
48AQI
56AQI
58AQI
59AQI
28AQI
32AQI
29AQI
28AQI
31AQI
37AQI
40AQI
No. of days
202533AQI
Highest AQI recorded in
September40AQI
Lowest AQI recorded in
March28AQI
Most & Least Polluted Years Over the Last 1 Years
Idaho City's annual 2025 AQI (33) shows an average percentage change of NaN% (improved AQI) compared to previous years: .