Island Of Montreal Center, Mont Royal, Quebec, 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
Island Of Montreal Center, Mont Royal, Quebec, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (10th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 34 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 10th Oct - 11th Oct 2025
Island Of Montreal Center, Mont Royal, Quebec, Canada
6 AM10th Oct 2025
6 PM
5 AM11th Oct 2025
45AQI
13AQI
56AQI
35AQI
In the last 24 hours,
Island Of Montreal Center's AQI reached its highest point of 56 at 5 AM during the Night, while the lowest point, 13, was recorded at 8 AM during the Day between 10th Oct and 11th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Island Of Montreal Center, Mont Royal, Quebec, Canada
17°C12/23°C
16°C9/22°C
18°C12/25°C
19°C14/24°C
19°C13/26°C
20°C13/27°C
20°C12/29°C
21°C13/30°C
15°C11/19°C
12°C6/19°C
13°C5/22°C
17°C12/24°C
18°C16/21°C
17°C14/22°C
17°C15/19°C
17°C14/23°C
15°C9/23°C
18°C14/25°C
17°C11/26°C
14°C10/19°C
11°C6/17°C
11°C4/20°C
13°C6/20°C
19°C13/27°C
22°C14/33°C
20°C14/30°C
19°C15/28°C
12°C5/16°C
6°C2/13°C
7°C0/16°C
--°C/°C
36AQI
32AQI
34AQI
32AQI
2025 Days Vs Air Quality
Island Of Montreal Center, Mont Royal, Quebec, Canada
88%
250
12%
33
Total number of days with different AQI categories in last 284 days in 2025 (81 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 284 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
Island Of Montreal Center, Mont Royal, Quebec, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI
24AQI
20AQI
20AQI
21AQI
26AQI
20AQI
19AQI
20AQI
22AQI
39AQI
31AQI
58AQI
30AQI
20AQI
32AQI
64AQI
44AQI
26AQI
25AQI
42AQI
51AQI
44AQI
46AQI
54AQI
39AQI
26AQI
23AQI
27AQI
23AQI
44AQI
23AQI
41AQI
56AQI
27AQI
24AQI
34AQI
32AQI
24AQI
35AQI
25AQI
30AQI
30AQI
26AQI
21AQI
23AQI
22AQI
21AQI
20AQI
20AQI
26AQI
20AQI
28AQI
52AQI
48AQI
60AQI
44AQI
43AQI
30AQI
25AQI
24AQI
42AQI
38AQI
56AQI
20AQI
23AQI
26AQI
24AQI
29AQI
43AQI
22AQI
42AQI
83AQI
61AQI
52AQI
22AQI
29AQI
33AQI
24AQI
20AQI
23AQI
18AQI
25AQI
26AQI
22AQI
21AQI
23AQI
20AQI
24AQI
33AQI
18AQI
20AQI
21AQI
19AQI
21AQI
18AQI
20AQI
22AQI
19AQI
26AQI
33AQI
37AQI
25AQI
28AQI
27AQI
17AQI
16AQI
29AQI
47AQI
15AQI
20AQI
21AQI
17AQI
22AQI
22AQI
24AQI
13AQI
24AQI
33AQI
18AQI
19AQI
26AQI
16AQI
32AQI
20AQI
22AQI
18AQI
16AQI
19AQI
22AQI
16AQI
23AQI
32AQI
37AQI
30AQI
42AQI
41AQI
21AQI
13AQI
14AQI
20AQI
16AQI
15AQI
14AQI
16AQI
24AQI
29AQI
33AQI
34AQI
26AQI
30AQI
14AQI
18AQI
28AQI
43AQI
43AQI
53AQI
59AQI
57AQI
59AQI
44AQI
52AQI
56AQI
28AQI
28AQI
32AQI
45AQI
43AQI
25AQI
40AQI
22AQI
27AQI
28AQI
42AQI
51AQI
44AQI
28AQI
31AQI
29AQI
29AQI
31AQI
35AQI
32AQI
41AQI
24AQI
26AQI
40AQI
41AQI
29AQI
41AQI
45AQI
47AQI
52AQI
42AQI
40AQI
39AQI
49AQI
46AQI
22AQI
35AQI
39AQI
30AQI
19AQI
25AQI
33AQI
36AQI
48AQI
57AQI
58AQI
54AQI
64AQI
47AQI
23AQI
33AQI
57AQI
80AQI
39AQI
32AQI
39AQI
52AQI
59AQI
63AQI
56AQI
57AQI
54AQI
45AQI
23AQI
38AQI
25AQI
16AQI
23AQI
23AQI
23AQI
35AQI
33AQI
31AQI
27AQI
15AQI
19AQI
26AQI
19AQI
17AQI
23AQI
36AQI
36AQI
32AQI
32AQI
30AQI
27AQI
22AQI
19AQI
27AQI
31AQI
37AQI
26AQI
36AQI
38AQI
30AQI
41AQI
39AQI
34AQI
18AQI
17AQI
26AQI
25AQI
38AQI
40AQI
17AQI
24AQI
27AQI
40AQI
48AQI
40AQI
27AQI
32AQI
47AQI
49AQI
59AQI
58AQI
47AQI
18AQI
19AQI
34AQI
33AQI
32AQI
31AQI
23AQI
24AQI
38AQI
40AQI
36AQI
31AQI
39AQI
No. of days
202532AQI
Highest AQI recorded in
July40AQI
Lowest AQI recorded in
April23AQI
202432AQI
Highest AQI recorded in
February50AQI
Lowest AQI recorded in
March12AQI
202334AQI
Highest AQI recorded in
December35AQI
Lowest AQI recorded in
November21AQI
202014AQI
Highest AQI recorded in
May31AQI
Lowest AQI recorded in
September0AQI
Most & Least Polluted Years Over the Last 4 Years
Island Of Montreal Center's annual 2025 AQI (32) shows an average percentage change of 39.2% (worsened AQI) compared to previous years: 2020 (14), 2023 (34), 2024 (32).