Montreal, 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
Montreal, Quebec, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (1st October):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 28 of Good air quality, showing improvement over 2025, 2024 and 2023 on the same day.
Day & Night AQI Trend: 30th Sep - 1st Oct 2026
Montreal, Quebec, Canada
6 AM30th Sep 2026
7 PM
5 AM1st Oct 2026
44AQI
21AQI
30AQI
21AQI
In the last 24 hours,
Montreal's AQI reached its highest point of 44 at 2 PM during the Day, while the lowest point, 21, was recorded at 1 AM during the Night between 30th Sep and 1st Oct 2026.
Day & Night AQI Trend : Sep - Oct 2026
Montreal, Quebec, Canada
19°C14/23°C
21°C18/28°C
20°C17/24°C
17°C14/21°C
17°C12/23°C
19°C13/28°C
18°C16/24°C
17°C13/21°C
19°C12/24°C
14°C9/20°C
16°C10/22°C
19°C17/22°C
15°C12/18°C
14°C9/18°C
19°C16/25°C
18°C13/23°C
16°C10/20°C
12°C7/17°C
14°C10/19°C
12°C10/16°C
12°C7/18°C
13°C7/19°C
14°C8/21°C
16°C10/23°C
17°C13/22°C
16°C13/20°C
12°C11/15°C
14°C11/18°C
15°C11/20°C
18°C14/22°C
31AQI
25AQI
33AQI
26AQI
2026 Days Vs Air Quality
Montreal, Quebec, Canada
95%
258
5%
13
Total number of days with different AQI categories in last 274 days in 2026 (91 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2026, 95% 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
Montreal, Quebec, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
16AQI (US)
28AQI (US)
17AQI (US)
39AQI (US)
39AQI (US)
59AQI (US)
58AQI (US)
62AQI (US)
41AQI (US)
16AQI (US)
16AQI (US)
17AQI (US)
46AQI (US)
38AQI (US)
31AQI (US)
14AQI (US)
36AQI (US)
32AQI (US)
39AQI (US)
21AQI (US)
24AQI (US)
49AQI (US)
54AQI (US)
48AQI (US)
46AQI (US)
48AQI (US)
45AQI (US)
47AQI (US)
52AQI (US)
50AQI (US)
45AQI (US)
47AQI (US)
49AQI (US)
51AQI (US)
54AQI (US)
50AQI (US)
41AQI (US)
39AQI (US)
46AQI (US)
46AQI (US)
47AQI (US)
47AQI (US)
44AQI (US)
52AQI (US)
50AQI (US)
42AQI (US)
44AQI (US)
45AQI (US)
43AQI (US)
41AQI (US)
42AQI (US)
36AQI (US)
35AQI (US)
40AQI (US)
44AQI (US)
42AQI (US)
35AQI (US)
35AQI (US)
39AQI (US)
42AQI (US)
53AQI (US)
46AQI (US)
45AQI (US)
42AQI (US)
38AQI (US)
40AQI (US)
39AQI (US)
41AQI (US)
34AQI (US)
43AQI (US)
42AQI (US)
40AQI (US)
37AQI (US)
36AQI (US)
37AQI (US)
34AQI (US)
32AQI (US)
32AQI (US)
37AQI (US)
36AQI (US)
36AQI (US)
41AQI (US)
36AQI (US)
34AQI (US)
30AQI (US)
30AQI (US)
35AQI (US)
31AQI (US)
28AQI (US)
25AQI (US)
33AQI (US)
34AQI (US)
28AQI (US)
31AQI (US)
29AQI (US)
28AQI (US)
27AQI (US)
31AQI (US)
28AQI (US)
31AQI (US)
33AQI (US)
29AQI (US)
33AQI (US)
33AQI (US)
33AQI (US)
30AQI (US)
33AQI (US)
33AQI (US)
30AQI (US)
28AQI (US)
24AQI (US)
28AQI (US)
32AQI (US)
33AQI (US)
29AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
27AQI (US)
24AQI (US)
21AQI (US)
30AQI (US)
33AQI (US)
31AQI (US)
28AQI (US)
28AQI (US)
34AQI (US)
32AQI (US)
29AQI (US)
29AQI (US)
25AQI (US)
45AQI (US)
52AQI (US)
56AQI (US)
57AQI (US)
55AQI (US)
49AQI (US)
44AQI (US)
44AQI (US)
50AQI (US)
48AQI (US)
45AQI (US)
29AQI (US)
26AQI (US)
18AQI (US)
19AQI (US)
20AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
22AQI (US)
24AQI (US)
27AQI (US)
25AQI (US)
20AQI (US)
25AQI (US)
25AQI (US)
27AQI (US)
25AQI (US)
26AQI (US)
22AQI (US)
23AQI (US)
24AQI (US)
25AQI (US)
26AQI (US)
25AQI (US)
22AQI (US)
23AQI (US)
21AQI (US)
23AQI (US)
22AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
29AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
30AQI (US)
27AQI (US)
29AQI (US)
33AQI (US)
31AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
39AQI (US)
37AQI (US)
35AQI (US)
46AQI (US)
42AQI (US)
39AQI (US)
41AQI (US)
28AQI (US)
26AQI (US)
30AQI (US)
39AQI (US)
40AQI (US)
39AQI (US)
50AQI (US)
39AQI (US)
33AQI (US)
47AQI (US)
41AQI (US)
43AQI (US)
32AQI (US)
38AQI (US)
37AQI (US)
42AQI (US)
38AQI (US)
39AQI (US)
27AQI (US)
29AQI (US)
34AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
30AQI (US)
33AQI (US)
28AQI (US)
25AQI (US)
28AQI (US)
27AQI (US)
27AQI (US)
27AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
22AQI (US)
25AQI (US)
27AQI (US)
26AQI (US)
26AQI (US)
25AQI (US)
25AQI (US)
23AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
29AQI (US)
34AQI (US)
38AQI (US)
42AQI (US)
30AQI (US)
31AQI (US)
26AQI (US)
28AQI (US)
28AQI (US)
32AQI (US)
24AQI (US)
31AQI (US)
28AQI (US)
25AQI (US)
26AQI (US)
28AQI (US)
34AQI (US)
27AQI (US)
27AQI (US)
23AQI (US)
37AQI (US)
29AQI (US)
28AQI (US)
38AQI (US)
44AQI (US)
37AQI (US)
30AQI (US)
35AQI (US)
25AQI (US)
34AQI (US)
30AQI (US)
29AQI (US)
28AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202532AQI (US)
Highest AQI (US) recorded in
July40AQI (US)
Lowest AQI (US) recorded in
May24AQI (US)
202431AQI (US)
Highest AQI (US) recorded in
August39AQI (US)
Lowest AQI (US) recorded in
November24AQI (US)
202333AQI (US)
Highest AQI (US) recorded in
June51AQI (US)
Lowest AQI (US) recorded in
November26AQI (US)
202231AQI (US)
Highest AQI (US) recorded in
January43AQI (US)
Lowest AQI (US) recorded in
September23AQI (US)
202129AQI (US)
Highest AQI (US) recorded in
February36AQI (US)
Lowest AQI (US) recorded in
September19AQI (US)
202024AQI (US)
Highest AQI (US) recorded in
November32AQI (US)
Lowest AQI (US) recorded in
October20AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Montreal's annual 2026 AQI (US) (33) shows an average percentage change of 11.2% (worsened AQI (US)) compared to previous years: 2020 (24), 2021 (29), 2022 (31), 2023 (33), 2024 (31), 2025 (32).