Hamilton, Ontario, Canada 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
Hamilton, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (31st October):
On this day, AQI across the 4 years varied significantly: 2026 ranks 1st highest AQI at 18 of Good air quality on the same day.
Day & Night AQI Trend: 30th Sep - 1st Oct 2026
Hamilton, Ontario, Canada
7 AM30th Sep 2026
7 PM
6 AM1st Oct 2026
39AQI
23AQI
48AQI
22AQI
In the last 24 hours,
Hamilton's AQI reached its highest point of 48 at 3 AM during the Night, while the lowest point, 22, was recorded at 12 AM during the Night between 30th Sep and 1st Oct 2026.
Day & Night AQI Trend : Sep - Oct 2026
Hamilton, Ontario, Canada
25°C20/32°C
24°C20/30°C
23°C18/31°C
21°C16/29°C
20°C16/25°C
21°C13/30°C
21°C15/27°C
22°C19/26°C
22°C17/28°C
20°C13/28°C
21°C13/29°C
22°C16/27°C
16°C12/21°C
19°C14/25°C
21°C19/23°C
20°C17/24°C
18°C15/22°C
16°C15/17°C
17°C15/19°C
13°C12/15°C
14°C12/16°C
15°C12/18°C
14°C12/17°C
15°C11/18°C
16°C12/21°C
17°C13/21°C
16°C15/19°C
18°C15/21°C
19°C15/23°C
22°C19/29°C
33AQI
28AQI
33AQI
29AQI
2026 Days Vs Air Quality
Hamilton, Ontario, Canada
92%
249
7%
20
0.3%
1
Total number of days with different AQI categories in last 274 days in 2026 (91 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2026, 92% of 274 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
Hamilton, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
14AQI (US)
16AQI (US)
22AQI (US)
34AQI (US)
45AQI (US)
85AQI (US)
56AQI (US)
61AQI (US)
36AQI (US)
21AQI (US)
20AQI (US)
29AQI (US)
37AQI (US)
35AQI (US)
11AQI (US)
26AQI (US)
38AQI (US)
25AQI (US)
30AQI (US)
22AQI (US)
29AQI (US)
52AQI (US)
56AQI (US)
47AQI (US)
48AQI (US)
48AQI (US)
41AQI (US)
45AQI (US)
50AQI (US)
56AQI (US)
45AQI (US)
45AQI (US)
52AQI (US)
54AQI (US)
46AQI (US)
50AQI (US)
50AQI (US)
40AQI (US)
45AQI (US)
46AQI (US)
44AQI (US)
40AQI (US)
39AQI (US)
47AQI (US)
50AQI (US)
45AQI (US)
45AQI (US)
59AQI (US)
44AQI (US)
41AQI (US)
41AQI (US)
36AQI (US)
36AQI (US)
37AQI (US)
45AQI (US)
45AQI (US)
34AQI (US)
38AQI (US)
35AQI (US)
38AQI (US)
60AQI (US)
48AQI (US)
48AQI (US)
43AQI (US)
39AQI (US)
37AQI (US)
38AQI (US)
38AQI (US)
33AQI (US)
41AQI (US)
40AQI (US)
40AQI (US)
35AQI (US)
33AQI (US)
38AQI (US)
34AQI (US)
32AQI (US)
38AQI (US)
41AQI (US)
39AQI (US)
38AQI (US)
40AQI (US)
37AQI (US)
38AQI (US)
36AQI (US)
28AQI (US)
31AQI (US)
31AQI (US)
26AQI (US)
29AQI (US)
30AQI (US)
30AQI (US)
30AQI (US)
31AQI (US)
30AQI (US)
31AQI (US)
27AQI (US)
34AQI (US)
29AQI (US)
31AQI (US)
30AQI (US)
29AQI (US)
33AQI (US)
38AQI (US)
37AQI (US)
32AQI (US)
30AQI (US)
32AQI (US)
28AQI (US)
28AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
26AQI (US)
23AQI (US)
25AQI (US)
26AQI (US)
23AQI (US)
23AQI (US)
34AQI (US)
37AQI (US)
31AQI (US)
26AQI (US)
30AQI (US)
30AQI (US)
27AQI (US)
26AQI (US)
35AQI (US)
22AQI (US)
45AQI (US)
52AQI (US)
56AQI (US)
57AQI (US)
54AQI (US)
51AQI (US)
45AQI (US)
43AQI (US)
50AQI (US)
47AQI (US)
45AQI (US)
34AQI (US)
29AQI (US)
27AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
31AQI (US)
32AQI (US)
32AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
22AQI (US)
26AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
33AQI (US)
32AQI (US)
28AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
38AQI (US)
32AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
30AQI (US)
27AQI (US)
30AQI (US)
34AQI (US)
32AQI (US)
45AQI (US)
41AQI (US)
32AQI (US)
53AQI (US)
81AQI (US)
82AQI (US)
102AQI (US)
55AQI (US)
45AQI (US)
59AQI (US)
27AQI (US)
29AQI (US)
27AQI (US)
35AQI (US)
40AQI (US)
47AQI (US)
50AQI (US)
27AQI (US)
30AQI (US)
29AQI (US)
42AQI (US)
36AQI (US)
30AQI (US)
26AQI (US)
30AQI (US)
36AQI (US)
40AQI (US)
32AQI (US)
31AQI (US)
34AQI (US)
34AQI (US)
36AQI (US)
42AQI (US)
37AQI (US)
32AQI (US)
28AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
37AQI (US)
38AQI (US)
28AQI (US)
28AQI (US)
34AQI (US)
25AQI (US)
32AQI (US)
29AQI (US)
26AQI (US)
34AQI (US)
25AQI (US)
35AQI (US)
48AQI (US)
44AQI (US)
29AQI (US)
27AQI (US)
31AQI (US)
34AQI (US)
28AQI (US)
29AQI (US)
25AQI (US)
33AQI (US)
34AQI (US)
35AQI (US)
32AQI (US)
33AQI (US)
34AQI (US)
28AQI (US)
33AQI (US)
29AQI (US)
28AQI (US)
30AQI (US)
28AQI (US)
27AQI (US)
30AQI (US)
27AQI (US)
30AQI (US)
38AQI (US)
41AQI (US)
27AQI (US)
31AQI (US)
31AQI (US)
38AQI (US)
44AQI (US)
38AQI (US)
30AQI (US)
36AQI (US)
27AQI (US)
41AQI (US)
32AQI (US)
32AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
June27AQI (US)
202536AQI (US)
Highest AQI (US) recorded in
August46AQI (US)
Lowest AQI (US) recorded in
May25AQI (US)
202434AQI (US)
Highest AQI (US) recorded in
January39AQI (US)
Lowest AQI (US) recorded in
November25AQI (US)
202343AQI (US)
Highest AQI (US) recorded in
June71AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202237AQI (US)
Highest AQI (US) recorded in
May43AQI (US)
Lowest AQI (US) recorded in
August25AQI (US)
202137AQI (US)
Highest AQI (US) recorded in
April41AQI (US)
Lowest AQI (US) recorded in
October28AQI (US)
202036AQI (US)
Highest AQI (US) recorded in
May44AQI (US)
Lowest AQI (US) recorded in
October27AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Hamilton's annual 2026 AQI (US) (35) shows an average percentage change of -5.3% (improved AQI (US)) compared to previous years: 2020 (36), 2021 (37), 2022 (37), 2023 (43), 2024 (34), 2025 (36).