Westmount, Quebec, 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
Westmount, Quebec, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (25th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 34 of Good air quality, showing improvement over 2023 on the same day.
Day & Night AQI Trend: 24th Sep - 25th Sep 2026
Westmount, Quebec, Canada
6 AM24th Sep 2026
7 PM
5 AM25th Sep 2026
42AQI
16AQI
52AQI
21AQI
In the last 24 hours,
Westmount's AQI reached its highest point of 52 at 4 AM during the Night, while the lowest point, 16, was recorded at 7 AM during the Day between 24th Sep and 25th Sep 2026.
Day & Night AQI Trend : Aug - Sep 2026
Westmount, Quebec, Canada
20°C16/25°C
19°C15/23°C
17°C12/24°C
19°C16/22°C
18°C12/26°C
19°C14/27°C
19°C14/23°C
22°C18/27°C
20°C17/24°C
17°C14/21°C
17°C12/23°C
19°C13/28°C
18°C16/24°C
18°C14/23°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
13°C9/20°C
12°C10/16°C
12°C7/18°C
13°C7/19°C
14°C8/21°C
16°C10/23°C
30AQI
24AQI
34AQI
26AQI
2026 Days Vs Air Quality
Westmount, Quebec, Canada
95%
253
5%
12
Total number of days with different AQI categories in last 268 days in 2026 (97 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2026, 95% of 268 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
Westmount, Quebec, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
34AQI (US)
28AQI (US)
44AQI (US)
40AQI (US)
63AQI (US)
68AQI (US)
68AQI (US)
44AQI (US)
17AQI (US)
17AQI (US)
20AQI (US)
46AQI (US)
40AQI (US)
32AQI (US)
16AQI (US)
40AQI (US)
34AQI (US)
38AQI (US)
25AQI (US)
24AQI (US)
49AQI (US)
53AQI (US)
48AQI (US)
46AQI (US)
47AQI (US)
44AQI (US)
46AQI (US)
51AQI (US)
50AQI (US)
44AQI (US)
47AQI (US)
48AQI (US)
50AQI (US)
52AQI (US)
49AQI (US)
40AQI (US)
39AQI (US)
44AQI (US)
45AQI (US)
46AQI (US)
46AQI (US)
46AQI (US)
53AQI (US)
50AQI (US)
42AQI (US)
42AQI (US)
46AQI (US)
42AQI (US)
40AQI (US)
43AQI (US)
38AQI (US)
36AQI (US)
40AQI (US)
45AQI (US)
42AQI (US)
35AQI (US)
34AQI (US)
38AQI (US)
42AQI (US)
52AQI (US)
45AQI (US)
44AQI (US)
42AQI (US)
38AQI (US)
39AQI (US)
38AQI (US)
40AQI (US)
34AQI (US)
42AQI (US)
42AQI (US)
40AQI (US)
36AQI (US)
36AQI (US)
36AQI (US)
34AQI (US)
33AQI (US)
32AQI (US)
36AQI (US)
36AQI (US)
35AQI (US)
40AQI (US)
36AQI (US)
34AQI (US)
30AQI (US)
32AQI (US)
34AQI (US)
31AQI (US)
28AQI (US)
24AQI (US)
32AQI (US)
34AQI (US)
28AQI (US)
32AQI (US)
30AQI (US)
28AQI (US)
27AQI (US)
31AQI (US)
28AQI (US)
30AQI (US)
34AQI (US)
29AQI (US)
33AQI (US)
34AQI (US)
32AQI (US)
30AQI (US)
34AQI (US)
34AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
29AQI (US)
33AQI (US)
34AQI (US)
29AQI (US)
24AQI (US)
22AQI (US)
26AQI (US)
28AQI (US)
26AQI (US)
22AQI (US)
28AQI (US)
32AQI (US)
31AQI (US)
28AQI (US)
27AQI (US)
33AQI (US)
32AQI (US)
30AQI (US)
30AQI (US)
24AQI (US)
46AQI (US)
52AQI (US)
56AQI (US)
58AQI (US)
54AQI (US)
49AQI (US)
44AQI (US)
44AQI (US)
50AQI (US)
47AQI (US)
44AQI (US)
29AQI (US)
26AQI (US)
18AQI (US)
20AQI (US)
20AQI (US)
25AQI (US)
25AQI (US)
24AQI (US)
22AQI (US)
24AQI (US)
27AQI (US)
25AQI (US)
20AQI (US)
24AQI (US)
24AQI (US)
27AQI (US)
24AQI (US)
26AQI (US)
21AQI (US)
23AQI (US)
23AQI (US)
25AQI (US)
24AQI (US)
25AQI (US)
22AQI (US)
23AQI (US)
20AQI (US)
22AQI (US)
22AQI (US)
23AQI (US)
24AQI (US)
26AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
28AQI (US)
30AQI (US)
30AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
30AQI (US)
27AQI (US)
29AQI (US)
33AQI (US)
30AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
42AQI (US)
38AQI (US)
34AQI (US)
46AQI (US)
41AQI (US)
38AQI (US)
40AQI (US)
28AQI (US)
28AQI (US)
30AQI (US)
40AQI (US)
41AQI (US)
38AQI (US)
50AQI (US)
38AQI (US)
33AQI (US)
49AQI (US)
42AQI (US)
42AQI (US)
32AQI (US)
39AQI (US)
37AQI (US)
40AQI (US)
36AQI (US)
37AQI (US)
27AQI (US)
30AQI (US)
33AQI (US)
26AQI (US)
27AQI (US)
26AQI (US)
29AQI (US)
32AQI (US)
28AQI (US)
24AQI (US)
28AQI (US)
28AQI (US)
28AQI (US)
28AQI (US)
25AQI (US)
32AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
23AQI (US)
25AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
28AQI (US)
34AQI (US)
41AQI (US)
43AQI (US)
30AQI (US)
32AQI (US)
26AQI (US)
28AQI (US)
28AQI (US)
32AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
28AQI (US)
34AQI (US)
40AQI (US)
44AQI (US)
37AQI (US)
30AQI (US)
35AQI (US)
24AQI (US)
35AQI (US)
30AQI (US)
29AQI (US)
No. of days
202634AQI (US)
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202533AQI (US)
Highest AQI (US) recorded in
July40AQI (US)
Lowest AQI (US) recorded in
April23AQI (US)
202430AQI (US)
Highest AQI (US) recorded in
February37AQI (US)
Lowest AQI (US) recorded in
November24AQI (US)
202334AQI (US)
Highest AQI (US) recorded in
June48AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202231AQI (US)
Highest AQI (US) recorded in
January41AQI (US)
Lowest AQI (US) recorded in
September24AQI (US)
202131AQI (US)
Highest AQI (US) recorded in
August39AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202024AQI (US)
Highest AQI (US) recorded in
June31AQI (US)
Lowest AQI (US) recorded in
May18AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Westmount's annual 2026 AQI (US) (34) shows an average percentage change of 12.8% (worsened AQI (US)) compared to previous years: 2020 (24), 2021 (31), 2022 (31), 2023 (34), 2024 (30), 2025 (33).