Hummelstown, Pennsylvania, 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
Hummelstown, Pennsylvania, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 73 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Hummelstown, Pennsylvania, United States
7 AM18th Oct 2025
6 PM
6 AM19th Oct 2025
53AQI
17AQI
49AQI
16AQI
In the last 24 hours,
Hummelstown's AQI reached its highest point of 53 at 12 PM during the Day, while the lowest point, undefined, was recorded at 6 AM during the Night between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Hummelstown, Pennsylvania, United States
21°C13/30°C
18°C14/24°C
19°C13/24°C
20°C16/25°C
22°C16/30°C
21°C17/29°C
22°C20/26°C
22°C17/29°C
21°C14/29°C
23°C16/32°C
21°C14/30°C
22°C15/31°C
18°C12/26°C
15°C7/24°C
16°C7/26°C
19°C9/31°C
20°C10/31°C
19°C10/31°C
22°C15/30°C
17°C10/20°C
12°C8/18°C
10°C3/19°C
12°C6/19°C
16°C14/22°C
14°C13/15°C
15°C12/20°C
14°C9/21°C
11°C6/18°C
11°C4/20°C
15°C7/26°C
--°C/°C
36AQI
31AQI
40AQI
29AQI
2025 Days Vs Air Quality
Hummelstown, Pennsylvania, United States
81%
166
19%
40
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 81%
Health Risk Level:
Low
In 2025, 81% of 292 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
Hummelstown, Pennsylvania, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
41AQI
66AQI
61AQI
43AQI
18AQI
24AQI
31AQI
25AQI
32AQI
29AQI
25AQI
23AQI
21AQI
34AQI
36AQI
17AQI
19AQI
34AQI
29AQI
12AQI
19AQI
40AQI
60AQI
26AQI
26AQI
28AQI
23AQI
51AQI
45AQI
31AQI
12AQI
18AQI
31AQI
27AQI
34AQI
42AQI
30AQI
27AQI
26AQI
25AQI
19AQI
28AQI
18AQI
23AQI
35AQI
37AQI
25AQI
22AQI
36AQI
44AQI
37AQI
17AQI
18AQI
17AQI
21AQI
13AQI
18AQI
13AQI
18AQI
26AQI
35AQI
19AQI
30AQI
30AQI
33AQI
18AQI
24AQI
36AQI
54AQI
65AQI
62AQI
57AQI
52AQI
33AQI
43AQI
58AQI
66AQI
75AQI
76AQI
30AQI
29AQI
28AQI
27AQI
24AQI
28AQI
49AQI
52AQI
55AQI
57AQI
56AQI
41AQI
45AQI
34AQI
39AQI
46AQI
30AQI
31AQI
45AQI
55AQI
65AQI
59AQI
35AQI
42AQI
38AQI
40AQI
48AQI
41AQI
31AQI
30AQI
29AQI
40AQI
26AQI
22AQI
27AQI
39AQI
38AQI
52AQI
56AQI
43AQI
52AQI
34AQI
69AQI
44AQI
53AQI
54AQI
55AQI
34AQI
33AQI
50AQI
63AQI
85AQI
81AQI
73AQI
68AQI
43AQI
45AQI
45AQI
46AQI
35AQI
34AQI
52AQI
51AQI
49AQI
29AQI
29AQI
19AQI
16AQI
25AQI
33AQI
31AQI
24AQI
19AQI
22AQI
30AQI
30AQI
21AQI
29AQI
27AQI
32AQI
36AQI
32AQI
39AQI
54AQI
36AQI
25AQI
26AQI
27AQI
27AQI
36AQI
48AQI
49AQI
53AQI
52AQI
28AQI
27AQI
43AQI
25AQI
28AQI
25AQI
36AQI
39AQI
37AQI
32AQI
36AQI
41AQI
41AQI
28AQI
25AQI
29AQI
35AQI
52AQI
57AQI
48AQI
37AQI
26AQI
25AQI
31AQI
38AQI
28AQI
27AQI
26AQI
40AQI
25AQI
26AQI
73AQI
46AQI
28AQI
26AQI
45AQI
43AQI
40AQI
36AQI
36AQI
No. of days
202537AQI
Highest AQI recorded in
March46AQI
Lowest AQI recorded in
May26AQI
Most & Least Polluted Years Over the Last 1 Years
Hummelstown's annual 2025 AQI (37) shows an average percentage change of NaN% (improved AQI) compared to previous years: .