Hamilton, 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
Hamilton, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (27th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 41 of Good air quality, showing improvement over 2023 on the same day.
Day & Night AQI Trend: 27th Sep - 28th Sep 2026
Hamilton, Ontario, Canada
6 AM27th Sep 2026
7 PM
5 AM28th Sep 2026
58AQI
32AQI
46AQI
22AQI
In the last 24 hours,
Hamilton's AQI reached its highest point of 58 at 8 AM during the Day, while the lowest point, 22, was recorded at 1 AM during the Night between 27th Sep and 28th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Hamilton, Ontario, Canada
22°C20/25°C
22°C19/26°C
24°C20/32°C
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
35AQI
29AQI
32AQI
30AQI
2026 Days Vs Air Quality
Hamilton, Ontario, Canada
92%
246
7%
20
0.3%
1
Total number of days with different AQI categories in last 271 days in 2026 (94 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2026, 92% of 271 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)
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).