Tualatin, Oregon, 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
Tualatin, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (8th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 51 of Moderate air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 8th Oct - 9th Oct 2025
Tualatin, Oregon, United States
7 AM8th Oct 2025
7 PM
6 AM9th Oct 2025
63AQI
25AQI
53AQI
40AQI
In the last 24 hours,
Tualatin's AQI reached its highest point of 63 at 7 AM during the Day, while the lowest point, undefined, was recorded at 6 AM during the Night between 8th Oct and 9th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Tualatin, Oregon, United States
21°C17/25°C
20°C17/23°C
18°C17/20°C
18°C16/22°C
20°C14/29°C
18°C15/21°C
17°C11/23°C
25°C17/35°C
21°C15/27°C
19°C14/27°C
21°C13/31°C
21°C14/29°C
17°C13/21°C
17°C9/27°C
21°C12/33°C
21°C13/31°C
17°C11/24°C
16°C8/25°C
19°C10/29°C
17°C10/26°C
16°C13/18°C
15°C11/23°C
15°C12/19°C
14°C12/20°C
14°C11/22°C
15°C13/20°C
16°C11/24°C
17°C9/26°C
20°C12/29°C
13°C9/17°C
--°C/°C
33AQI
28AQI
33AQI
29AQI
2025 Days Vs Air Quality
Tualatin, Oregon, United States
96%
269
4%
12
Total number of days with different AQI categories in last 282 days in 2025 (83 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2025, 96% of 282 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
Tualatin, Oregon, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
24AQI
22AQI
19AQI
20AQI
21AQI
20AQI
29AQI
28AQI
37AQI
25AQI
29AQI
39AQI
49AQI
45AQI
52AQI
46AQI
34AQI
44AQI
26AQI
52AQI
58AQI
50AQI
47AQI
30AQI
26AQI
32AQI
42AQI
58AQI
69AQI
37AQI
21AQI
23AQI
21AQI
33AQI
30AQI
25AQI
27AQI
25AQI
40AQI
34AQI
24AQI
24AQI
24AQI
28AQI
45AQI
24AQI
22AQI
20AQI
22AQI
22AQI
26AQI
24AQI
18AQI
22AQI
23AQI
26AQI
31AQI
45AQI
44AQI
24AQI
26AQI
23AQI
32AQI
32AQI
31AQI
36AQI
37AQI
29AQI
51AQI
22AQI
19AQI
22AQI
20AQI
18AQI
22AQI
19AQI
19AQI
15AQI
16AQI
23AQI
18AQI
20AQI
27AQI
30AQI
18AQI
16AQI
18AQI
23AQI
17AQI
27AQI
21AQI
23AQI
31AQI
25AQI
33AQI
16AQI
15AQI
21AQI
26AQI
20AQI
20AQI
25AQI
21AQI
26AQI
29AQI
26AQI
25AQI
25AQI
22AQI
18AQI
18AQI
19AQI
24AQI
34AQI
28AQI
22AQI
15AQI
18AQI
19AQI
26AQI
25AQI
14AQI
15AQI
17AQI
20AQI
27AQI
23AQI
26AQI
26AQI
15AQI
21AQI
21AQI
24AQI
22AQI
21AQI
15AQI
16AQI
16AQI
13AQI
15AQI
22AQI
16AQI
20AQI
19AQI
15AQI
18AQI
24AQI
17AQI
21AQI
19AQI
16AQI
21AQI
23AQI
17AQI
17AQI
21AQI
20AQI
35AQI
34AQI
35AQI
35AQI
32AQI
22AQI
20AQI
21AQI
27AQI
22AQI
16AQI
16AQI
16AQI
12AQI
12AQI
23AQI
34AQI
32AQI
21AQI
15AQI
15AQI
18AQI
22AQI
21AQI
16AQI
15AQI
16AQI
21AQI
18AQI
18AQI
22AQI
16AQI
15AQI
18AQI
18AQI
20AQI
16AQI
20AQI
22AQI
29AQI
29AQI
22AQI
21AQI
22AQI
24AQI
23AQI
21AQI
18AQI
16AQI
21AQI
23AQI
21AQI
23AQI
22AQI
17AQI
16AQI
20AQI
24AQI
41AQI
20AQI
18AQI
20AQI
21AQI
25AQI
31AQI
36AQI
37AQI
16AQI
14AQI
13AQI
17AQI
17AQI
19AQI
18AQI
21AQI
30AQI
41AQI
51AQI
47AQI
55AQI
45AQI
39AQI
36AQI
33AQI
39AQI
27AQI
31AQI
53AQI
48AQI
53AQI
38AQI
27AQI
27AQI
24AQI
40AQI
44AQI
25AQI
38AQI
20AQI
21AQI
27AQI
31AQI
27AQI
30AQI
42AQI
28AQI
26AQI
36AQI
53AQI
25AQI
31AQI
40AQI
25AQI
24AQI
18AQI
17AQI
20AQI
48AQI
40AQI
42AQI
42AQI
32AQI
51AQI
37AQI
27AQI
25AQI
23AQI
20AQI
22AQI
20AQI
28AQI
33AQI
37AQI
No. of days
202526AQI
Highest AQI recorded in
January37AQI
Lowest AQI recorded in
May20AQI
202427AQI
Highest AQI recorded in
November34AQI
Lowest AQI recorded in
May19AQI
202331AQI
Highest AQI recorded in
August40AQI
Lowest AQI recorded in
April24AQI
202234AQI
Highest AQI recorded in
October63AQI
Lowest AQI recorded in
May22AQI
202129AQI
Highest AQI recorded in
March39AQI
Lowest AQI recorded in
May23AQI
202039AQI
Highest AQI recorded in
September105AQI
Lowest AQI recorded in
June20AQI
Most & Least Polluted Years Over the Last 6 Years
Tualatin's annual 2025 AQI (26) shows an average percentage change of -16.6% (improved AQI) compared to previous years: 2020 (39), 2021 (29), 2022 (34), 2023 (31), 2024 (27).