Bellevue, Washington, 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
Bellevue, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (14th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 42 of Good air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 14th Oct - 15th Oct 2025
Bellevue, Washington, United States
7 AM14th Oct 2025
6 PM
6 AM15th Oct 2025
45AQI
36AQI
56AQI
44AQI
In the last 24 hours,
Bellevue's AQI reached its highest point of 56 at 1 AM during the Night, while the lowest point, 36, was recorded at 3 PM during the Day between 14th Oct and 15th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Bellevue, Washington, United States
17°C13/22°C
23°C13/33°C
21°C15/27°C
16°C12/21°C
17°C10/25°C
19°C13/25°C
16°C14/20°C
16°C11/24°C
18°C11/28°C
18°C11/25°C
14°C10/18°C
16°C10/23°C
19°C14/26°C
17°C12/25°C
17°C15/21°C
16°C12/25°C
16°C13/22°C
16°C12/22°C
14°C10/18°C
15°C11/18°C
14°C10/21°C
15°C7/24°C
16°C8/27°C
13°C10/18°C
13°C10/20°C
13°C10/19°C
11°C9/14°C
10°C8/13°C
10°C6/16°C
9°C4/16°C
--°C/°C
38AQI
33AQI
41AQI
35AQI
2025 Days Vs Air Quality
Bellevue, Washington, United States
97%
277
3%
10
Total number of days with different AQI categories in last 288 days in 2025 (77 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 288 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
Bellevue, Washington, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
30AQI
23AQI
22AQI
22AQI
23AQI
31AQI
26AQI
35AQI
28AQI
25AQI
34AQI
35AQI
35AQI
40AQI
34AQI
35AQI
40AQI
42AQI
36AQI
49AQI
42AQI
45AQI
42AQI
38AQI
46AQI
47AQI
46AQI
51AQI
50AQI
28AQI
19AQI
21AQI
22AQI
23AQI
21AQI
22AQI
25AQI
28AQI
36AQI
25AQI
23AQI
29AQI
33AQI
25AQI
24AQI
23AQI
21AQI
21AQI
25AQI
19AQI
24AQI
23AQI
18AQI
20AQI
20AQI
23AQI
26AQI
27AQI
32AQI
28AQI
25AQI
21AQI
19AQI
27AQI
21AQI
23AQI
19AQI
18AQI
20AQI
19AQI
17AQI
17AQI
17AQI
18AQI
17AQI
15AQI
18AQI
14AQI
16AQI
16AQI
17AQI
16AQI
20AQI
20AQI
16AQI
16AQI
14AQI
19AQI
17AQI
16AQI
17AQI
17AQI
20AQI
21AQI
19AQI
13AQI
14AQI
12AQI
16AQI
16AQI
16AQI
17AQI
20AQI
19AQI
20AQI
19AQI
21AQI
22AQI
17AQI
13AQI
14AQI
16AQI
20AQI
31AQI
35AQI
24AQI
16AQI
13AQI
15AQI
21AQI
23AQI
13AQI
14AQI
14AQI
18AQI
18AQI
14AQI
16AQI
19AQI
15AQI
14AQI
17AQI
19AQI
18AQI
13AQI
14AQI
12AQI
14AQI
11AQI
12AQI
14AQI
15AQI
15AQI
15AQI
14AQI
15AQI
18AQI
15AQI
18AQI
17AQI
18AQI
17AQI
17AQI
17AQI
18AQI
17AQI
20AQI
24AQI
25AQI
28AQI
33AQI
31AQI
24AQI
20AQI
21AQI
20AQI
17AQI
15AQI
15AQI
15AQI
12AQI
12AQI
19AQI
36AQI
30AQI
16AQI
14AQI
15AQI
19AQI
20AQI
20AQI
15AQI
16AQI
17AQI
34AQI
20AQI
19AQI
21AQI
16AQI
17AQI
21AQI
18AQI
21AQI
18AQI
20AQI
26AQI
33AQI
32AQI
24AQI
25AQI
26AQI
23AQI
25AQI
22AQI
19AQI
23AQI
25AQI
24AQI
24AQI
25AQI
21AQI
22AQI
25AQI
26AQI
46AQI
35AQI
20AQI
17AQI
18AQI
21AQI
25AQI
26AQI
27AQI
26AQI
22AQI
15AQI
13AQI
16AQI
20AQI
20AQI
19AQI
21AQI
28AQI
32AQI
41AQI
53AQI
53AQI
51AQI
40AQI
52AQI
39AQI
46AQI
42AQI
45AQI
58AQI
52AQI
61AQI
59AQI
31AQI
30AQI
35AQI
42AQI
44AQI
30AQI
33AQI
22AQI
21AQI
27AQI
33AQI
23AQI
28AQI
40AQI
24AQI
23AQI
35AQI
46AQI
20AQI
28AQI
26AQI
16AQI
27AQI
26AQI
16AQI
33AQI
47AQI
49AQI
43AQI
49AQI
51AQI
49AQI
50AQI
47AQI
30AQI
38AQI
31AQI
42AQI
36AQI
24AQI
19AQI
18AQI
16AQI
20AQI
22AQI
30AQI
34AQI
41AQI
No. of days
202525AQI
Highest AQI recorded in
October41AQI
Lowest AQI recorded in
May16AQI
202415AQI
Highest AQI recorded in
December32AQI
Lowest AQI recorded in
April5AQI
202315AQI
Highest AQI recorded in
August30AQI
Lowest AQI recorded in
April7AQI
202218AQI
Highest AQI recorded in
October57AQI
Lowest AQI recorded in
April8AQI
202112AQI
Highest AQI recorded in
August18AQI
Lowest AQI recorded in
May7AQI
202029AQI
Highest AQI recorded in
September69AQI
Lowest AQI recorded in
November15AQI
Most & Least Polluted Years Over the Last 6 Years
Bellevue's annual 2025 AQI (25) shows an average percentage change of 51.7% (worsened AQI) compared to previous years: 2020 (29), 2021 (12), 2022 (18), 2023 (15), 2024 (15).