Waterloo, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
June Air Quality Analysis
Waterloo, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (2nd June):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 28 of Good air quality, showing improvement over 2024 and 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 1st Jun - 2nd Jun 2026
Waterloo, Ontario, Canada
5 AM1st Jun 2026
8 PM
4 AM2nd Jun 2026
34AQI
21AQI
37AQI
23AQI
In the last 24 hours,
Waterloo's AQI reached its highest point of 37 at 4 AM during the Night, while the lowest point, 21, was recorded at 5 PM during the Day between 1st Jun and 2nd Jun 2026.
Day & Night AQI Trend : May - Jun 2026
Waterloo, Ontario, Canada
15°C6/24°C
14°C9/19°C
8°C4/11°C
6°C1/11°C
9°C3/17°C
11°C6/18°C
8°C2/14°C
7°C2/12°C
8°C0/17°C
8°C5/13°C
8°C5/11°C
12°C3/21°C
15°C8/22°C
21°C14/31°C
24°C16/32°C
22°C18/30°C
10°C5/12°C
9°C3/18°C
11°C4/19°C
10°C8/12°C
13°C8/17°C
17°C12/25°C
20°C12/28°C
20°C14/29°C
15°C9/22°C
17°C7/26°C
14°C7/20°C
15°C6/24°C
16°C8/22°C
17°C7/25°C
42AQI
36AQI
40AQI
38AQI
2026 Days Vs Air Quality
Waterloo, Ontario, Canada
77%
115
22%
33
1%
2
Total number of days with different AQI categories in last 153 days in 2026 (212 days remaining)
Under WHO’s Safe Air Quality Limits: 77%
Health Risk Level:
Low
In 2026, 77% of 153 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
Waterloo, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
8AQI (US)
9AQI (US)
24AQI (US)
18AQI (US)
70AQI (US)
92AQI (US)
64AQI (US)
75AQI (US)
36AQI (US)
29AQI (US)
23AQI (US)
48AQI (US)
60AQI (US)
43AQI (US)
10AQI (US)
42AQI (US)
46AQI (US)
32AQI (US)
34AQI (US)
22AQI (US)
46AQI (US)
48AQI (US)
38AQI (US)
35AQI (US)
38AQI (US)
32AQI (US)
46AQI (US)
40AQI (US)
34AQI (US)
44AQI (US)
35AQI (US)
30AQI (US)
73AQI (US)
84AQI (US)
32AQI (US)
50AQI (US)
84AQI (US)
25AQI (US)
38AQI (US)
40AQI (US)
79AQI (US)
36AQI (US)
29AQI (US)
50AQI (US)
86AQI (US)
82AQI (US)
104AQI (US)
118AQI (US)
64AQI (US)
48AQI (US)
51AQI (US)
42AQI (US)
34AQI (US)
34AQI (US)
44AQI (US)
58AQI (US)
30AQI (US)
75AQI (US)
36AQI (US)
28AQI (US)
38AQI (US)
62AQI (US)
99AQI (US)
79AQI (US)
62AQI (US)
83AQI (US)
30AQI (US)
30AQI (US)
62AQI (US)
40AQI (US)
28AQI (US)
42AQI (US)
27AQI (US)
29AQI (US)
28AQI (US)
34AQI (US)
36AQI (US)
68AQI (US)
83AQI (US)
44AQI (US)
60AQI (US)
30AQI (US)
30AQI (US)
50AQI (US)
64AQI (US)
26AQI (US)
25AQI (US)
42AQI (US)
48AQI (US)
67AQI (US)
28AQI (US)
29AQI (US)
44AQI (US)
32AQI (US)
28AQI (US)
30AQI (US)
22AQI (US)
40AQI (US)
54AQI (US)
34AQI (US)
32AQI (US)
52AQI (US)
50AQI (US)
54AQI (US)
44AQI (US)
50AQI (US)
42AQI (US)
26AQI (US)
21AQI (US)
36AQI (US)
41AQI (US)
26AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
32AQI (US)
28AQI (US)
22AQI (US)
20AQI (US)
20AQI (US)
36AQI (US)
38AQI (US)
35AQI (US)
38AQI (US)
28AQI (US)
35AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
41AQI (US)
20AQI (US)
32AQI (US)
58AQI (US)
70AQI (US)
66AQI (US)
46AQI (US)
54AQI (US)
32AQI (US)
30AQI (US)
37AQI (US)
38AQI (US)
47AQI (US)
26AQI (US)
28AQI (US)
24AQI (US)
24AQI (US)
24AQI (US)
32AQI (US)
23AQI (US)
28AQI (US)
39AQI (US)
56AQI (US)
48AQI (US)
35AQI (US)
35AQI (US)
26AQI (US)
No. of days
202642AQI (US)
Highest AQI (US) recorded in
February56AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202535AQI (US)
Highest AQI (US) recorded in
August48AQI (US)
Lowest AQI (US) recorded in
May24AQI (US)
202433AQI (US)
Highest AQI (US) recorded in
January37AQI (US)
Lowest AQI (US) recorded in
November25AQI (US)
202342AQI (US)
Highest AQI (US) recorded in
June72AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202235AQI (US)
Highest AQI (US) recorded in
June39AQI (US)
Lowest AQI (US) recorded in
August17AQI (US)
202137AQI (US)
Highest AQI (US) recorded in
July46AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202032AQI (US)
Highest AQI (US) recorded in
November35AQI (US)
Lowest AQI (US) recorded in
October24AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Waterloo's annual 2026 AQI (US) (42) shows an average percentage change of 18.6% (worsened AQI (US)) compared to previous years: 2020 (32), 2021 (37), 2022 (35), 2023 (42), 2024 (33), 2025 (35).