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HistoryAQIPM2.5PM10COSO2NO2O3

South Shore Of Montreal, Longueuil, Quebec, Canada Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

August Air Quality Analysis

South Shore Of Montreal, Longueuil, Quebec, Canada

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
6th Aug 2021
87AQI
Lowest AQI recorded on
9th Aug 2024
13AQI

Same Day Analysis (31st August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 24 of Good air quality, showing improvement over 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

2025 Days Vs Air Quality

South Shore Of Montreal, Longueuil, Quebec, Canada

2025

88%

214

12%

29

Total number of days with different AQI categories in last 244 days in 2025 (121 days remaining)

Good
214 Days
Moderate
29 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 88%

Health Risk Level:

Low

In 2025, 88% of 244 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

South Shore Of Montreal, Longueuil, Quebec, Canada

AQI levels in 2025

AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
29AQI
2nd January 2025
21AQI
3rd January 2025
20AQI
4th January 2025
20AQI
5th January 2025
21AQI
6th January 2025
23AQI
7th January 2025
19AQI
8th January 2025
19AQI
9th January 2025
20AQI
10th January 2025
21AQI
11th January 2025
42AQI
12th January 2025
33AQI
13th January 2025
58AQI
14th January 2025
29AQI
15th January 2025
20AQI
16th January 2025
28AQI
17th January 2025
62AQI
18th January 2025
44AQI
19th January 2025
23AQI
20th January 2025
23AQI
21st January 2025
35AQI
22nd January 2025
47AQI
23rd January 2025
48AQI
24th January 2025
43AQI
25th January 2025
53AQI
26th January 2025
37AQI
27th January 2025
29AQI
28th January 2025
26AQI
29th January 2025
29AQI
30th January 2025
23AQI
31st January 2025
41AQI
1st February 2025
23AQI
2nd February 2025
37AQI
3rd February 2025
55AQI
4th February 2025
27AQI
5th February 2025
22AQI
6th February 2025
36AQI
7th February 2025
35AQI
8th February 2025
29AQI
9th February 2025
34AQI
10th February 2025
25AQI
11th February 2025
27AQI
12th February 2025
29AQI
13th February 2025
27AQI
14th February 2025
21AQI
15th February 2025
23AQI
16th February 2025
23AQI
17th February 2025
21AQI
18th February 2025
21AQI
19th February 2025
21AQI
20th February 2025
25AQI
21st February 2025
20AQI
22nd February 2025
24AQI
23rd February 2025
50AQI
24th February 2025
48AQI
25th February 2025
59AQI
26th February 2025
47AQI
27th February 2025
47AQI
28th February 2025
30AQI
1st March 2025
26AQI
2nd March 2025
22AQI
3rd March 2025
34AQI
4th March 2025
36AQI
5th March 2025
56AQI
6th March 2025
20AQI
7th March 2025
22AQI
8th March 2025
25AQI
9th March 2025
24AQI
10th March 2025
30AQI
11th March 2025
44AQI
12th March 2025
23AQI
13th March 2025
41AQI
14th March 2025
73AQI
15th March 2025
57AQI
16th March 2025
52AQI
17th March 2025
25AQI
18th March 2025
31AQI
19th March 2025
36AQI
20th March 2025
25AQI
21st March 2025
21AQI
22nd March 2025
24AQI
23rd March 2025
21AQI
24th March 2025
24AQI
25th March 2025
25AQI
26th March 2025
22AQI
27th March 2025
20AQI
28th March 2025
22AQI
29th March 2025
21AQI
30th March 2025
24AQI
31st March 2025
31AQI
1st April 2025
18AQI
2nd April 2025
19AQI
3rd April 2025
20AQI
4th April 2025
19AQI
5th April 2025
20AQI
6th April 2025
19AQI
7th April 2025
20AQI
8th April 2025
21AQI
9th April 2025
18AQI
10th April 2025
26AQI
11th April 2025
33AQI
12th April 2025
41AQI
13th April 2025
26AQI
14th April 2025
34AQI
15th April 2025
29AQI
16th April 2025
14AQI
17th April 2025
16AQI
18th April 2025
26AQI
19th April 2025
43AQI
20th April 2025
16AQI
21st April 2025
22AQI
22nd April 2025
22AQI
23rd April 2025
15AQI
24th April 2025
24AQI
25th April 2025
23AQI
26th April 2025
25AQI
27th April 2025
14AQI
28th April 2025
23AQI
29th April 2025
31AQI
30th April 2025
17AQI
1st May 2025
18AQI
2nd May 2025
26AQI
3rd May 2025
16AQI
4th May 2025
29AQI
5th May 2025
22AQI
6th May 2025
21AQI
7th May 2025
17AQI
8th May 2025
17AQI
9th May 2025
17AQI
10th May 2025
24AQI
11th May 2025
16AQI
12th May 2025
23AQI
13th May 2025
36AQI
14th May 2025
37AQI
15th May 2025
30AQI
16th May 2025
43AQI
17th May 2025
41AQI
18th May 2025
22AQI
19th May 2025
14AQI
20th May 2025
15AQI
21st May 2025
19AQI
22nd May 2025
16AQI
23rd May 2025
15AQI
24th May 2025
13AQI
25th May 2025
16AQI
26th May 2025
24AQI
27th May 2025
26AQI
28th May 2025
33AQI
29th May 2025
34AQI
30th May 2025
27AQI
31st May 2025
34AQI
1st June 2025
18AQI
2nd June 2025
21AQI
3rd June 2025
26AQI
4th June 2025
41AQI
5th June 2025
42AQI
6th June 2025
53AQI
7th June 2025
58AQI
8th June 2025
58AQI
9th June 2025
59AQI
10th June 2025
44AQI
11th June 2025
51AQI
12th June 2025
56AQI
13th June 2025
27AQI
14th June 2025
29AQI
15th June 2025
31AQI
16th June 2025
47AQI
17th June 2025
44AQI
18th June 2025
24AQI
19th June 2025
38AQI
20th June 2025
22AQI
21st June 2025
27AQI
22nd June 2025
29AQI
23rd June 2025
41AQI
24th June 2025
51AQI
25th June 2025
47AQI
26th June 2025
29AQI
27th June 2025
29AQI
28th June 2025
27AQI
29th June 2025
30AQI
30th June 2025
31AQI
1st July 2025
35AQI
2nd July 2025
31AQI
3rd July 2025
38AQI
4th July 2025
23AQI
5th July 2025
27AQI
6th July 2025
41AQI
7th July 2025
44AQI
8th July 2025
32AQI
9th July 2025
44AQI
10th July 2025
48AQI
11th July 2025
50AQI
12th July 2025
52AQI
13th July 2025
41AQI
14th July 2025
38AQI
15th July 2025
38AQI
16th July 2025
48AQI
17th July 2025
47AQI
18th July 2025
22AQI
19th July 2025
33AQI
20th July 2025
39AQI
21st July 2025
30AQI
22nd July 2025
19AQI
23rd July 2025
24AQI
24th July 2025
33AQI
25th July 2025
37AQI
26th July 2025
49AQI
27th July 2025
56AQI
28th July 2025
58AQI
29th July 2025
55AQI
30th July 2025
63AQI
31st July 2025
45AQI
1st August 2025
23AQI
2nd August 2025
32AQI
3rd August 2025
54AQI
4th August 2025
76AQI
5th August 2025
39AQI
6th August 2025
33AQI
7th August 2025
42AQI
8th August 2025
52AQI
9th August 2025
59AQI
10th August 2025
63AQI
11th August 2025
56AQI
12th August 2025
57AQI
13th August 2025
53AQI
14th August 2025
45AQI
15th August 2025
23AQI
16th August 2025
35AQI
17th August 2025
27AQI
18th August 2025
16AQI
19th August 2025
22AQI
20th August 2025
22AQI
21st August 2025
23AQI
22nd August 2025
36AQI
23rd August 2025
33AQI
24th August 2025
31AQI
25th August 2025
26AQI
26th August 2025
15AQI
27th August 2025
18AQI
28th August 2025
24AQI
29th August 2025
20AQI
30th August 2025
18AQI
31st August 2025
24AQI
1st September 2025
2nd September 2025
3rd September 2025
4th September 2025
5th September 2025
6th September 2025
7th September 2025
8th September 2025
9th September 2025
10th September 2025
11th September 2025
12th September 2025
13th September 2025
14th September 2025
15th September 2025
16th September 2025
17th September 2025
18th September 2025
19th September 2025
20th September 2025
21st September 2025
22nd September 2025
23rd September 2025
24th September 2025
25th September 2025
26th September 2025
27th September 2025
28th September 2025
29th September 2025
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025

32AQI

32AQI

31AQI

23AQI

24AQI

38AQI

40AQI

35AQI

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202532AQI

28
3
26
2
27
4
30
31
23
7
26
5
23
8
214
29

Highest AQI recorded in

July

40AQI

Lowest AQI recorded in

April

23AQI

202430AQI

27
4
24
5
29
2
29
31
25
4
28
3
22
9
24
6
31
30
25
4
2
325
37
2

Highest AQI recorded in

December

38AQI

Lowest AQI recorded in

April

23AQI

202337AQI

29
2
21
7
30
1
28
2
30
1
19
7
4
19
11
1
25
6
21
9
26
5
26
3
20
11
294
65
5

Highest AQI recorded in

June

52AQI

Lowest AQI recorded in

October

29AQI

202233AQI

18
11
1
17
4
27
4
17
30
1
29
1
20
2
1
29
27
4
28
2
26
5
269
34
1

Highest AQI recorded in

January

50AQI

Lowest AQI recorded in

August

21AQI

202133AQI

23
7
20
8
29
2
28
1
28
3
29
1
25
4
2
24
7
30
30
1
28
2
25
4
319
40
2

Highest AQI recorded in

February

41AQI

Lowest AQI recorded in

September

21AQI

202029AQI

6
30
1
31
30
31
24
6
27
4
179
11

Highest AQI recorded in

November

36AQI

Lowest AQI recorded in

September

23AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2023(Avg.)
37AQI
Least Polluted Year Recorded
2020(Avg.)
29AQI

South Shore Of Montreal's annual 2025 AQI (32) shows an average percentage change of -1.06% (improved AQI) compared to previous years: 2020 (29), 2021 (33), 2022 (33), 2023 (37), 2024 (30).