Belleville, Ontario, Canada 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
Belleville, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (21st September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 17 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Belleville, Ontario, Canada
6 AM21st Sep 2025
7 PM
5 AM22nd Sep 2025
24AQI
16AQI
26AQI
18AQI
In the last 24 hours,
Belleville's AQI reached its highest point of 26 at 5 AM during the Night, while the lowest point, 16, was recorded at 11 AM during the Day between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Belleville, Ontario, Canada
22°C16/28°C
22°C19/26°C
18°C14/23°C
17°C11/22°C
17°C10/25°C
17°C14/22°C
14°C9/19°C
16°C7/24°C
18°C8/27°C
19°C10/28°C
20°C13/27°C
19°C11/28°C
18°C12/23°C
17°C8/25°C
16°C11/22°C
16°C11/22°C
13°C5/20°C
15°C5/25°C
17°C9/27°C
19°C10/27°C
18°C11/27°C
16°C13/21°C
20°C13/28°C
19°C10/28°C
19°C10/28°C
18°C10/26°C
19°C10/29°C
16°C10/23°C
13°C6/21°C
16°C3/28°C
--°C/°C
25AQI
23AQI
26AQI
24AQI
2025 Days Vs Air Quality
Belleville, Ontario, Canada
89%
234
11%
30
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 265 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
Belleville, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
18AQI
22AQI
22AQI
27AQI
27AQI
23AQI
23AQI
25AQI
26AQI
28AQI
29AQI
54AQI
34AQI
26AQI
22AQI
32AQI
49AQI
27AQI
24AQI
25AQI
26AQI
26AQI
33AQI
39AQI
44AQI
34AQI
29AQI
30AQI
27AQI
26AQI
38AQI
28AQI
26AQI
43AQI
23AQI
24AQI
28AQI
28AQI
29AQI
27AQI
29AQI
30AQI
27AQI
25AQI
28AQI
30AQI
27AQI
27AQI
28AQI
22AQI
21AQI
27AQI
36AQI
55AQI
50AQI
56AQI
32AQI
29AQI
28AQI
29AQI
27AQI
29AQI
35AQI
32AQI
24AQI
31AQI
31AQI
30AQI
30AQI
30AQI
28AQI
27AQI
50AQI
52AQI
29AQI
15AQI
19AQI
23AQI
22AQI
15AQI
17AQI
17AQI
20AQI
19AQI
19AQI
19AQI
19AQI
18AQI
23AQI
23AQI
16AQI
17AQI
23AQI
17AQI
18AQI
17AQI
17AQI
15AQI
17AQI
27AQI
25AQI
33AQI
22AQI
23AQI
22AQI
14AQI
16AQI
25AQI
45AQI
16AQI
17AQI
19AQI
14AQI
22AQI
29AQI
26AQI
14AQI
17AQI
27AQI
15AQI
17AQI
25AQI
15AQI
18AQI
17AQI
16AQI
21AQI
15AQI
18AQI
19AQI
19AQI
22AQI
31AQI
24AQI
22AQI
28AQI
30AQI
17AQI
13AQI
12AQI
16AQI
16AQI
11AQI
12AQI
14AQI
18AQI
24AQI
27AQI
20AQI
35AQI
22AQI
12AQI
17AQI
26AQI
50AQI
44AQI
56AQI
59AQI
69AQI
51AQI
35AQI
52AQI
63AQI
31AQI
26AQI
30AQI
34AQI
25AQI
29AQI
31AQI
28AQI
52AQI
54AQI
52AQI
54AQI
40AQI
31AQI
28AQI
26AQI
27AQI
29AQI
33AQI
28AQI
43AQI
31AQI
37AQI
49AQI
48AQI
27AQI
31AQI
46AQI
47AQI
48AQI
36AQI
44AQI
52AQI
58AQI
38AQI
21AQI
23AQI
24AQI
37AQI
19AQI
20AQI
33AQI
31AQI
53AQI
49AQI
53AQI
46AQI
55AQI
66AQI
31AQI
29AQI
67AQI
92AQI
80AQI
60AQI
73AQI
75AQI
67AQI
63AQI
53AQI
52AQI
39AQI
41AQI
36AQI
47AQI
39AQI
15AQI
18AQI
17AQI
16AQI
23AQI
26AQI
27AQI
18AQI
15AQI
17AQI
21AQI
17AQI
17AQI
21AQI
27AQI
29AQI
27AQI
26AQI
33AQI
25AQI
20AQI
18AQI
18AQI
22AQI
28AQI
27AQI
34AQI
39AQI
34AQI
32AQI
32AQI
35AQI
20AQI
17AQI
17AQI
30AQI
31AQI
26AQI
21AQI
20AQI
39AQI
40AQI
39AQI
27AQI
No. of days
202530AQI
Highest AQI recorded in
July40AQI
Lowest AQI recorded in
May20AQI
202428AQI
Highest AQI recorded in
August33AQI
Lowest AQI recorded in
November18AQI
202337AQI
Highest AQI recorded in
June76AQI
Lowest AQI recorded in
October25AQI
202230AQI
Highest AQI recorded in
February34AQI
Lowest AQI recorded in
August20AQI
202131AQI
Highest AQI recorded in
August38AQI
Lowest AQI recorded in
October24AQI
202032AQI
Highest AQI recorded in
July38AQI
Lowest AQI recorded in
October26AQI
Most & Least Polluted Years Over the Last 6 Years
Belleville's annual 2025 AQI (30) shows an average percentage change of -3.8% (improved AQI) compared to previous years: 2020 (32), 2021 (31), 2022 (30), 2023 (37), 2024 (28).