Lewiston, Idaho, 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
Lewiston, Idaho, United States
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 25 of Good air quality, showing improvement over 2024 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Oct - 4th Oct 2025
Lewiston, Idaho, United States
6 AM3rd Oct 2025
6 PM
5 AM4th Oct 2025
40AQI
20AQI
65AQI
46AQI
In the last 24 hours,
Lewiston's AQI reached its highest point of 65 at 12 AM during the Night, while the lowest point, 20, was recorded at 2 PM during the Day between 3rd Oct and 4th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Lewiston, Idaho, United States
27°C16/38°C
26°C15/37°C
23°C15/37°C
23°C13/34°C
22°C13/32°C
22°C16/31°C
21°C13/31°C
21°C14/30°C
18°C15/25°C
20°C11/31°C
16°C13/20°C
15°C10/21°C
17°C7/30°C
22°C11/33°C
23°C15/33°C
24°C16/33°C
24°C17/33°C
20°C13/29°C
17°C10/25°C
19°C9/30°C
23°C14/34°C
22°C13/33°C
19°C12/26°C
19°C10/29°C
21°C13/32°C
21°C15/29°C
18°C14/25°C
18°C14/26°C
16°C13/22°C
16°C12/23°C
--°C/°C
47AQI
41AQI
42AQI
42AQI
2025 Days Vs Air Quality
Lewiston, Idaho, United States
92%
253
8%
23
Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 277 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
Lewiston, Idaho, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
33AQI
37AQI
29AQI
25AQI
24AQI
25AQI
26AQI
30AQI
29AQI
27AQI
21AQI
24AQI
28AQI
33AQI
43AQI
30AQI
26AQI
29AQI
32AQI
29AQI
33AQI
45AQI
48AQI
42AQI
39AQI
38AQI
41AQI
47AQI
51AQI
55AQI
40AQI
22AQI
34AQI
34AQI
33AQI
25AQI
44AQI
35AQI
31AQI
35AQI
28AQI
31AQI
35AQI
32AQI
30AQI
32AQI
24AQI
36AQI
24AQI
24AQI
29AQI
23AQI
20AQI
16AQI
15AQI
16AQI
19AQI
20AQI
20AQI
22AQI
23AQI
25AQI
20AQI
19AQI
19AQI
20AQI
22AQI
20AQI
16AQI
18AQI
18AQI
18AQI
19AQI
18AQI
15AQI
17AQI
20AQI
20AQI
18AQI
20AQI
17AQI
18AQI
19AQI
23AQI
24AQI
20AQI
20AQI
21AQI
24AQI
19AQI
21AQI
21AQI
22AQI
26AQI
23AQI
24AQI
22AQI
16AQI
15AQI
23AQI
19AQI
19AQI
19AQI
25AQI
26AQI
25AQI
18AQI
22AQI
23AQI
22AQI
14AQI
21AQI
24AQI
27AQI
25AQI
27AQI
32AQI
23AQI
21AQI
20AQI
23AQI
26AQI
29AQI
15AQI
17AQI
20AQI
19AQI
18AQI
24AQI
24AQI
19AQI
18AQI
16AQI
18AQI
19AQI
18AQI
15AQI
13AQI
17AQI
13AQI
14AQI
18AQI
17AQI
19AQI
21AQI
23AQI
18AQI
20AQI
21AQI
18AQI
23AQI
22AQI
19AQI
21AQI
21AQI
23AQI
25AQI
26AQI
30AQI
29AQI
34AQI
31AQI
31AQI
24AQI
22AQI
22AQI
23AQI
25AQI
23AQI
20AQI
20AQI
15AQI
15AQI
20AQI
31AQI
30AQI
22AQI
18AQI
16AQI
17AQI
19AQI
25AQI
25AQI
25AQI
20AQI
26AQI
22AQI
22AQI
25AQI
24AQI
18AQI
20AQI
25AQI
23AQI
25AQI
26AQI
31AQI
35AQI
32AQI
29AQI
29AQI
30AQI
28AQI
30AQI
31AQI
26AQI
20AQI
20AQI
20AQI
23AQI
28AQI
35AQI
37AQI
37AQI
34AQI
31AQI
29AQI
30AQI
23AQI
18AQI
18AQI
22AQI
26AQI
28AQI
32AQI
34AQI
24AQI
18AQI
17AQI
23AQI
29AQI
27AQI
26AQI
41AQI
57AQI
58AQI
57AQI
57AQI
59AQI
59AQI
55AQI
51AQI
56AQI
55AQI
58AQI
62AQI
60AQI
85AQI
95AQI
64AQI
51AQI
49AQI
57AQI
43AQI
36AQI
44AQI
40AQI
22AQI
26AQI
31AQI
33AQI
35AQI
41AQI
41AQI
26AQI
44AQI
43AQI
49AQI
59AQI
65AQI
62AQI
48AQI
31AQI
24AQI
27AQI
25AQI
34AQI
27AQI
20AQI
22AQI
19AQI
23AQI
26AQI
36AQI
49AQI
25AQI
No. of days
202528AQI
Highest AQI recorded in
September49AQI
Lowest AQI recorded in
May19AQI
202430AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
May21AQI
202329AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
December19AQI
202228AQI
Highest AQI recorded in
September75AQI
Lowest AQI recorded in
May13AQI
202132AQI
Highest AQI recorded in
July64AQI
Lowest AQI recorded in
May19AQI
202034AQI
Highest AQI recorded in
September84AQI
Lowest AQI recorded in
June15AQI
Most & Least Polluted Years Over the Last 6 Years
Lewiston's annual 2025 AQI (28) shows an average percentage change of -6.7% (improved AQI) compared to previous years: 2020 (34), 2021 (32), 2022 (28), 2023 (29), 2024 (30).