Chacnier, Longueuil, 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
Chacnier, Longueuil, 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 2022 on the same day.
Day & Night AQI Trend: 30th Sep - 1st Oct 2026
Chacnier, Longueuil, Quebec, Canada
6 AM30th Sep 2026
7 PM
5 AM1st Oct 2026
46AQI
21AQI
33AQI
21AQI
In the last 24 hours,
Chacnier's AQI reached its highest point of 46 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
Chacnier, Longueuil, Quebec, Canada
20°C15/27°C
22°C19/28°C
21°C17/25°C
18°C16/22°C
17°C12/23°C
20°C12/30°C
19°C16/25°C
18°C14/22°C
20°C14/24°C
15°C10/21°C
17°C10/24°C
19°C17/22°C
15°C12/19°C
14°C9/18°C
19°C15/25°C
18°C13/24°C
16°C11/21°C
12°C7/17°C
13°C9/20°C
13°C10/16°C
12°C7/18°C
13°C7/19°C
14°C8/21°C
16°C10/23°C
17°C13/23°C
16°C13/20°C
12°C11/15°C
14°C11/19°C
15°C11/20°C
19°C14/24°C
31AQI
25AQI
33AQI
25AQI
2026 Days Vs Air Quality
Chacnier, Longueuil, Quebec, Canada
94%
255
6%
16
Total number of days with different AQI categories in last 275 days in 2026 (90 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2026, 94% of 275 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
Chacnier, Longueuil, Quebec, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
17AQI (US)
35AQI (US)
19AQI (US)
51AQI (US)
46AQI (US)
59AQI (US)
59AQI (US)
70AQI (US)
45AQI (US)
17AQI (US)
17AQI (US)
18AQI (US)
53AQI (US)
42AQI (US)
35AQI (US)
16AQI (US)
41AQI (US)
36AQI (US)
50AQI (US)
23AQI (US)
34AQI (US)
50AQI (US)
54AQI (US)
49AQI (US)
48AQI (US)
48AQI (US)
44AQI (US)
47AQI (US)
52AQI (US)
49AQI (US)
45AQI (US)
48AQI (US)
49AQI (US)
50AQI (US)
54AQI (US)
50AQI (US)
41AQI (US)
39AQI (US)
46AQI (US)
46AQI (US)
47AQI (US)
47AQI (US)
44AQI (US)
51AQI (US)
49AQI (US)
42AQI (US)
45AQI (US)
45AQI (US)
43AQI (US)
40AQI (US)
43AQI (US)
35AQI (US)
35AQI (US)
40AQI (US)
44AQI (US)
42AQI (US)
35AQI (US)
35AQI (US)
38AQI (US)
42AQI (US)
53AQI (US)
47AQI (US)
45AQI (US)
43AQI (US)
39AQI (US)
40AQI (US)
39AQI (US)
41AQI (US)
34AQI (US)
43AQI (US)
42AQI (US)
40AQI (US)
37AQI (US)
36AQI (US)
37AQI (US)
35AQI (US)
33AQI (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)
32AQI (US)
29AQI (US)
28AQI (US)
27AQI (US)
31AQI (US)
28AQI (US)
31AQI (US)
33AQI (US)
28AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
30AQI (US)
33AQI (US)
33AQI (US)
30AQI (US)
28AQI (US)
24AQI (US)
28AQI (US)
32AQI (US)
33AQI (US)
29AQI (US)
25AQI (US)
24AQI (US)
27AQI (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)
53AQI (US)
56AQI (US)
57AQI (US)
55AQI (US)
49AQI (US)
44AQI (US)
44AQI (US)
51AQI (US)
49AQI (US)
46AQI (US)
28AQI (US)
26AQI (US)
19AQI (US)
19AQI (US)
20AQI (US)
26AQI (US)
27AQI (US)
24AQI (US)
23AQI (US)
24AQI (US)
27AQI (US)
25AQI (US)
19AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
22AQI (US)
23AQI (US)
23AQI (US)
25AQI (US)
26AQI (US)
25AQI (US)
23AQI (US)
23AQI (US)
21AQI (US)
24AQI (US)
22AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
28AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
28AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
31AQI (US)
28AQI (US)
28AQI (US)
33AQI (US)
31AQI (US)
33AQI (US)
32AQI (US)
33AQI (US)
37AQI (US)
38AQI (US)
36AQI (US)
48AQI (US)
43AQI (US)
41AQI (US)
42AQI (US)
28AQI (US)
25AQI (US)
30AQI (US)
40AQI (US)
41AQI (US)
40AQI (US)
51AQI (US)
39AQI (US)
34AQI (US)
47AQI (US)
43AQI (US)
43AQI (US)
31AQI (US)
37AQI (US)
38AQI (US)
42AQI (US)
41AQI (US)
41AQI (US)
27AQI (US)
29AQI (US)
37AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
31AQI (US)
33AQI (US)
28AQI (US)
25AQI (US)
30AQI (US)
28AQI (US)
28AQI (US)
27AQI (US)
25AQI (US)
31AQI (US)
28AQI (US)
26AQI (US)
25AQI (US)
28AQI (US)
22AQI (US)
26AQI (US)
28AQI (US)
25AQI (US)
27AQI (US)
25AQI (US)
25AQI (US)
21AQI (US)
24AQI (US)
29AQI (US)
28AQI (US)
29AQI (US)
34AQI (US)
36AQI (US)
43AQI (US)
29AQI (US)
30AQI (US)
26AQI (US)
26AQI (US)
28AQI (US)
31AQI (US)
23AQI (US)
31AQI (US)
28AQI (US)
25AQI (US)
25AQI (US)
28AQI (US)
33AQI (US)
26AQI (US)
26AQI (US)
23AQI (US)
37AQI (US)
29AQI (US)
28AQI (US)
41AQI (US)
44AQI (US)
37AQI (US)
30AQI (US)
35AQI (US)
25AQI (US)
35AQI (US)
31AQI (US)
28AQI (US)
28AQI (US)
No. of days
202634AQI (US)
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202533AQI (US)
Highest AQI (US) recorded in
July40AQI (US)
Lowest AQI (US) recorded in
April23AQI (US)
202431AQI (US)
Highest AQI (US) recorded in
September39AQI (US)
Lowest AQI (US) recorded in
November24AQI (US)
202336AQI (US)
Highest AQI (US) recorded in
June56AQI (US)
Lowest AQI (US) recorded in
October24AQI (US)
202232AQI (US)
Highest AQI (US) recorded in
January46AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202130AQI (US)
Highest AQI (US) recorded in
February42AQI (US)
Lowest AQI (US) recorded in
September24AQI (US)
202023AQI (US)
Highest AQI (US) recorded in
November32AQI (US)
Lowest AQI (US) recorded in
March16AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Chacnier's annual 2026 AQI (US) (34) shows an average percentage change of 12.4% (worsened AQI (US)) compared to previous years: 2020 (23), 2021 (30), 2022 (32), 2023 (36), 2024 (31), 2025 (33).