Bristol, 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
Bristol, Pennsylvania, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 50 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Bristol, Pennsylvania, United States
6 AM18th Oct 2025
6 PM
5 AM19th Oct 2025
52AQI
44AQI
56AQI
45AQI
In the last 24 hours,
Bristol's AQI reached its highest point of 56 at 8 PM during the Night, while the lowest point, 44, was recorded at 1 PM during the Day between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Bristol, Pennsylvania, United States
24°C17/33°C
19°C15/22°C
18°C12/25°C
18°C11/25°C
23°C16/33°C
24°C19/32°C
24°C21/28°C
24°C19/32°C
22°C16/31°C
23°C18/32°C
22°C17/30°C
22°C17/31°C
19°C14/25°C
15°C10/22°C
16°C7/25°C
20°C10/32°C
22°C13/32°C
21°C13/30°C
22°C16/28°C
20°C14/23°C
14°C10/19°C
11°C5/17°C
14°C9/20°C
16°C13/19°C
14°C12/15°C
15°C12/18°C
17°C12/25°C
13°C8/20°C
13°C7/20°C
15°C7/23°C
--°C/°C
40AQI
39AQI
44AQI
42AQI
2025 Days Vs Air Quality
Bristol, Pennsylvania, United States
87%
254
13%
37
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% 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
Bristol, Pennsylvania, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
20AQI
30AQI
24AQI
28AQI
34AQI
22AQI
27AQI
28AQI
27AQI
42AQI
50AQI
49AQI
26AQI
24AQI
41AQI
56AQI
44AQI
46AQI
26AQI
33AQI
53AQI
68AQI
66AQI
61AQI
48AQI
44AQI
32AQI
30AQI
28AQI
43AQI
32AQI
24AQI
43AQI
35AQI
25AQI
30AQI
33AQI
33AQI
33AQI
32AQI
41AQI
49AQI
24AQI
30AQI
33AQI
22AQI
29AQI
28AQI
24AQI
24AQI
25AQI
35AQI
50AQI
53AQI
40AQI
48AQI
46AQI
30AQI
29AQI
30AQI
31AQI
38AQI
29AQI
24AQI
31AQI
30AQI
28AQI
30AQI
35AQI
28AQI
31AQI
42AQI
35AQI
31AQI
21AQI
17AQI
30AQI
26AQI
19AQI
24AQI
17AQI
30AQI
30AQI
22AQI
20AQI
36AQI
56AQI
50AQI
36AQI
19AQI
21AQI
34AQI
30AQI
24AQI
35AQI
23AQI
30AQI
22AQI
25AQI
25AQI
16AQI
19AQI
32AQI
35AQI
15AQI
21AQI
35AQI
53AQI
32AQI
25AQI
35AQI
24AQI
56AQI
33AQI
34AQI
14AQI
19AQI
31AQI
36AQI
24AQI
43AQI
45AQI
29AQI
24AQI
24AQI
19AQI
33AQI
22AQI
19AQI
34AQI
37AQI
26AQI
27AQI
30AQI
36AQI
33AQI
18AQI
19AQI
16AQI
17AQI
14AQI
19AQI
13AQI
14AQI
18AQI
27AQI
19AQI
18AQI
36AQI
31AQI
18AQI
23AQI
32AQI
48AQI
53AQI
54AQI
40AQI
29AQI
27AQI
34AQI
53AQI
62AQI
70AQI
75AQI
39AQI
36AQI
35AQI
28AQI
34AQI
27AQI
47AQI
50AQI
57AQI
58AQI
56AQI
46AQI
42AQI
37AQI
47AQI
49AQI
36AQI
30AQI
48AQI
49AQI
65AQI
56AQI
37AQI
38AQI
37AQI
38AQI
36AQI
31AQI
23AQI
25AQI
23AQI
35AQI
30AQI
24AQI
27AQI
31AQI
36AQI
47AQI
37AQI
35AQI
49AQI
42AQI
82AQI
47AQI
54AQI
57AQI
57AQI
42AQI
51AQI
53AQI
64AQI
77AQI
73AQI
49AQI
32AQI
35AQI
35AQI
49AQI
45AQI
36AQI
35AQI
48AQI
51AQI
52AQI
32AQI
23AQI
20AQI
17AQI
29AQI
34AQI
29AQI
30AQI
20AQI
21AQI
34AQI
31AQI
20AQI
24AQI
34AQI
30AQI
32AQI
28AQI
43AQI
54AQI
44AQI
25AQI
27AQI
26AQI
29AQI
42AQI
44AQI
45AQI
43AQI
38AQI
27AQI
26AQI
35AQI
21AQI
25AQI
23AQI
30AQI
43AQI
31AQI
37AQI
47AQI
51AQI
45AQI
24AQI
43AQI
40AQI
52AQI
58AQI
67AQI
58AQI
46AQI
33AQI
38AQI
40AQI
50AQI
35AQI
28AQI
23AQI
38AQI
25AQI
28AQI
50AQI
38AQI
34AQI
30AQI
28AQI
25AQI
44AQI
41AQI
38AQI
35AQI
42AQI
No. of days
202535AQI
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
May25AQI
202434AQI
Highest AQI recorded in
July39AQI
Lowest AQI recorded in
November27AQI
202340AQI
Highest AQI recorded in
June72AQI
Lowest AQI recorded in
October28AQI
202235AQI
Highest AQI recorded in
July40AQI
Lowest AQI recorded in
September30AQI
202139AQI
Highest AQI recorded in
July55AQI
Lowest AQI recorded in
April34AQI
202034AQI
Highest AQI recorded in
November43AQI
Lowest AQI recorded in
September28AQI
Most & Least Polluted Years Over the Last 6 Years
Bristol's annual 2025 AQI (35) shows an average percentage change of -2.9% (improved AQI) compared to previous years: 2020 (34), 2021 (39), 2022 (35), 2023 (40), 2024 (34).