Centennial HS, Gresham, Oregon, 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
Centennial HS, Gresham, Oregon, United States
AQI Trends: Highest and Lowest
Same Day Analysis (30th September):
On this day, AQI across the 2 years varied significantly: 2026 ranks 1st highest AQI at 29 of Good air quality on the same day.
Day & Night AQI Trend: 29th Sep - 30th Sep 2026
Centennial HS, Gresham, Oregon, United States
6 AM29th Sep 2026
7 PM
5 AM30th Sep 2026
80AQI
24AQI
55AQI
17AQI
In the last 24 hours,
Centennial HS's AQI reached its highest point of 80 at 9 AM during the Day, while the lowest point, 17, was recorded at 12 AM during the Night between 29th Sep and 30th Sep 2026.
Day & Night AQI Trend : Sep 2026
Centennial HS, Gresham, Oregon, United States
18°C13/23°C
15°C13/19°C
15°C12/19°C
15°C12/20°C
16°C11/23°C
15°C14/17°C
17°C12/22°C
19°C10/28°C
21°C13/31°C
19°C13/25°C
15°C10/21°C
16°C11/21°C
13°C10/17°C
15°C11/21°C
14°C11/16°C
19°C11/27°C
19°C13/27°C
18°C12/24°C
17°C11/24°C
18°C11/27°C
17°C12/24°C
16°C12/22°C
16°C11/22°C
15°C10/21°C
14°C10/18°C
13°C8/20°C
15°C9/23°C
14°C9/21°C
14°C11/18°C
17°C14/22°C
51AQI
37AQI
47AQI
35AQI
2026 Days Vs Air Quality
Centennial HS, Gresham, Oregon, United States
82%
221
18%
49
Total number of days with different AQI categories in last 273 days in 2026 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 82%
Health Risk Level:
Low
In 2026, 82% of 273 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Centennial HS, Gresham, Oregon, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI (US)
18AQI (US)
27AQI (US)
12AQI (US)
20AQI (US)
28AQI (US)
11AQI (US)
11AQI (US)
14AQI (US)
49AQI (US)
48AQI (US)
43AQI (US)
60AQI (US)
61AQI (US)
41AQI (US)
17AQI (US)
20AQI (US)
26AQI (US)
20AQI (US)
27AQI (US)
26AQI (US)
48AQI (US)
54AQI (US)
48AQI (US)
45AQI (US)
46AQI (US)
44AQI (US)
47AQI (US)
52AQI (US)
49AQI (US)
45AQI (US)
48AQI (US)
49AQI (US)
49AQI (US)
48AQI (US)
47AQI (US)
39AQI (US)
40AQI (US)
46AQI (US)
46AQI (US)
46AQI (US)
40AQI (US)
42AQI (US)
48AQI (US)
48AQI (US)
39AQI (US)
44AQI (US)
46AQI (US)
40AQI (US)
41AQI (US)
38AQI (US)
34AQI (US)
37AQI (US)
40AQI (US)
46AQI (US)
41AQI (US)
36AQI (US)
34AQI (US)
39AQI (US)
40AQI (US)
55AQI (US)
46AQI (US)
46AQI (US)
41AQI (US)
38AQI (US)
40AQI (US)
40AQI (US)
40AQI (US)
35AQI (US)
43AQI (US)
42AQI (US)
40AQI (US)
35AQI (US)
36AQI (US)
36AQI (US)
33AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
37AQI (US)
37AQI (US)
39AQI (US)
37AQI (US)
31AQI (US)
28AQI (US)
29AQI (US)
31AQI (US)
29AQI (US)
26AQI (US)
25AQI (US)
31AQI (US)
31AQI (US)
26AQI (US)
31AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
30AQI (US)
28AQI (US)
31AQI (US)
30AQI (US)
26AQI (US)
33AQI (US)
33AQI (US)
32AQI (US)
29AQI (US)
28AQI (US)
32AQI (US)
26AQI (US)
26AQI (US)
23AQI (US)
26AQI (US)
28AQI (US)
32AQI (US)
25AQI (US)
23AQI (US)
23AQI (US)
25AQI (US)
26AQI (US)
23AQI (US)
23AQI (US)
30AQI (US)
32AQI (US)
30AQI (US)
28AQI (US)
27AQI (US)
34AQI (US)
29AQI (US)
26AQI (US)
27AQI (US)
25AQI (US)
47AQI (US)
52AQI (US)
58AQI (US)
57AQI (US)
55AQI (US)
50AQI (US)
41AQI (US)
49AQI (US)
49AQI (US)
47AQI (US)
43AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
31AQI (US)
31AQI (US)
29AQI (US)
25AQI (US)
28AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
24AQI (US)
24AQI (US)
22AQI (US)
25AQI (US)
24AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
29AQI (US)
27AQI (US)
25AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
25AQI (US)
25AQI (US)
28AQI (US)
29AQI (US)
27AQI (US)
29AQI (US)
32AQI (US)
30AQI (US)
29AQI (US)
31AQI (US)
30AQI (US)
28AQI (US)
28AQI (US)
59AQI (US)
54AQI (US)
46AQI (US)
47AQI (US)
55AQI (US)
56AQI (US)
48AQI (US)
58AQI (US)
61AQI (US)
61AQI (US)
54AQI (US)
51AQI (US)
50AQI (US)
62AQI (US)
50AQI (US)
47AQI (US)
54AQI (US)
62AQI (US)
71AQI (US)
72AQI (US)
72AQI (US)
53AQI (US)
47AQI (US)
83AQI (US)
63AQI (US)
58AQI (US)
62AQI (US)
63AQI (US)
46AQI (US)
63AQI (US)
56AQI (US)
53AQI (US)
51AQI (US)
46AQI (US)
50AQI (US)
44AQI (US)
63AQI (US)
55AQI (US)
41AQI (US)
52AQI (US)
61AQI (US)
63AQI (US)
65AQI (US)
61AQI (US)
64AQI (US)
62AQI (US)
63AQI (US)
54AQI (US)
52AQI (US)
41AQI (US)
35AQI (US)
49AQI (US)
36AQI (US)
42AQI (US)
50AQI (US)
48AQI (US)
48AQI (US)
52AQI (US)
36AQI (US)
27AQI (US)
46AQI (US)
38AQI (US)
43AQI (US)
48AQI (US)
45AQI (US)
46AQI (US)
46AQI (US)
54AQI (US)
50AQI (US)
59AQI (US)
44AQI (US)
30AQI (US)
33AQI (US)
44AQI (US)
45AQI (US)
29AQI (US)
35AQI (US)
43AQI (US)
37AQI (US)
28AQI (US)
36AQI (US)
26AQI (US)
41AQI (US)
58AQI (US)
44AQI (US)
No. of days
202639AQI (US)
Highest AQI (US) recorded in
August58AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202527AQI (US)
Highest AQI (US) recorded in
November40AQI (US)
Lowest AQI (US) recorded in
May17AQI (US)
Most & Least Polluted Years Over the Last 2 Years
Centennial HS's annual 2026 AQI (US) (39) shows an average percentage change of 44.4% (worsened AQI (US)) compared to previous years: 2025 (27).