Hamilton, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Hamilton, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (31st July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 76 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
2025 Days Vs Air Quality
Hamilton, Ontario, Canada
87%
184
13%
28
Total number of days with different AQI categories in last 213 days in 2025 (152 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 213 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
Hamilton, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
21AQI
23AQI
27AQI
25AQI
22AQI
22AQI
26AQI
25AQI
46AQI
66AQI
52AQI
41AQI
28AQI
27AQI
54AQI
45AQI
27AQI
25AQI
24AQI
24AQI
31AQI
44AQI
29AQI
53AQI
33AQI
27AQI
27AQI
25AQI
25AQI
58AQI
26AQI
30AQI
59AQI
24AQI
26AQI
38AQI
27AQI
46AQI
33AQI
29AQI
50AQI
28AQI
30AQI
30AQI
38AQI
30AQI
26AQI
26AQI
22AQI
21AQI
25AQI
49AQI
60AQI
53AQI
56AQI
35AQI
43AQI
24AQI
28AQI
26AQI
31AQI
38AQI
54AQI
25AQI
30AQI
33AQI
29AQI
31AQI
32AQI
26AQI
34AQI
63AQI
61AQI
31AQI
16AQI
24AQI
45AQI
29AQI
17AQI
17AQI
23AQI
24AQI
20AQI
19AQI
23AQI
24AQI
23AQI
26AQI
24AQI
17AQI
21AQI
29AQI
21AQI
24AQI
17AQI
20AQI
15AQI
20AQI
29AQI
39AQI
37AQI
34AQI
34AQI
18AQI
14AQI
19AQI
40AQI
43AQI
20AQI
24AQI
15AQI
26AQI
40AQI
50AQI
31AQI
15AQI
27AQI
40AQI
23AQI
32AQI
35AQI
19AQI
18AQI
20AQI
27AQI
31AQI
20AQI
26AQI
25AQI
23AQI
33AQI
41AQI
38AQI
39AQI
37AQI
29AQI
18AQI
18AQI
16AQI
19AQI
16AQI
11AQI
12AQI
13AQI
19AQI
32AQI
35AQI
28AQI
32AQI
27AQI
16AQI
19AQI
33AQI
61AQI
51AQI
62AQI
63AQI
78AQI
63AQI
48AQI
57AQI
66AQI
44AQI
31AQI
39AQI
41AQI
45AQI
38AQI
29AQI
36AQI
45AQI
46AQI
52AQI
54AQI
46AQI
43AQI
39AQI
34AQI
36AQI
41AQI
39AQI
41AQI
48AQI
37AQI
46AQI
50AQI
48AQI
37AQI
40AQI
39AQI
51AQI
44AQI
39AQI
45AQI
56AQI
66AQI
42AQI
24AQI
29AQI
25AQI
42AQI
27AQI
26AQI
34AQI
32AQI
52AQI
40AQI
52AQI
49AQI
47AQI
76AQI
33AQI
35AQI
30AQI
27AQI
25AQI
45AQI
43AQI
No. of days
202534AQI
Highest AQI recorded in
June45AQI
Lowest AQI recorded in
May25AQI
202434AQI
Highest AQI recorded in
May39AQI
Lowest AQI recorded in
November25AQI
202343AQI
Highest AQI recorded in
June71AQI
Lowest AQI recorded in
October30AQI
202237AQI
Highest AQI recorded in
May43AQI
Lowest AQI recorded in
August25AQI
202137AQI
Highest AQI recorded in
April42AQI
Lowest AQI recorded in
October28AQI
202036AQI
Highest AQI recorded in
May44AQI
Lowest AQI recorded in
October27AQI
Most & Least Polluted Years Over the Last 6 Years
Hamilton's annual 2025 AQI (34) shows an average percentage change of -8.1% (improved AQI) compared to previous years: 2020 (36), 2021 (37), 2022 (37), 2023 (43), 2024 (34).
