Waterloo, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Waterloo, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (18th July):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 132 of Poor air quality on the same day.
Day & Night AQI Trend: 18th Jul - 19th Jul 2026
Waterloo, Ontario, Canada
5 AM18th Jul 2026
9 PM
4 AM19th Jul 2026
183AQI
60AQI
150AQI
78AQI
In the last 24 hours,
Waterloo's AQI reached its highest point of 183 at 5 AM during the Day, while the lowest point, 60, was recorded at 2 PM during the Day between 18th Jul and 19th Jul 2026.
Day & Night AQI Trend : Jun - Jul 2026
Waterloo, Ontario, Canada
16°C11/23°C
18°C10/24°C
16°C14/21°C
17°C10/23°C
18°C11/24°C
17°C13/21°C
19°C15/25°C
20°C12/28°C
22°C13/31°C
23°C14/33°C
27°C18/34°C
28°C23/37°C
27°C22/36°C
27°C21/34°C
24°C21/30°C
22°C18/28°C
22°C15/29°C
23°C18/31°C
24°C16/33°C
24°C19/30°C
23°C18/28°C
23°C16/30°C
23°C14/31°C
24°C14/34°C
29°C21/38°C
26°C20/34°C
22°C17/27°C
23°C14/32°C
23°C17/30°C
19°C13/25°C
76AQI
59AQI
73AQI
66AQI
2026 Days Vs Air Quality
Waterloo, Ontario, Canada
76%
148
21%
42
2%
3
0.5%
1
1%
2
Total number of days with different AQI categories in last 200 days in 2026 (165 days remaining)
Under WHO’s Safe Air Quality Limits: 76%
Health Risk Level:
Low
In 2026, 76% of 200 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)
30AQI (US)
31AQI (US)
50AQI (US)
48AQI (US)
41AQI (US)
33AQI (US)
55AQI (US)
50AQI (US)
42AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
20AQI (US)
22AQI (US)
36AQI (US)
34AQI (US)
25AQI (US)
18AQI (US)
20AQI (US)
26AQI (US)
24AQI (US)
22AQI (US)
42AQI (US)
38AQI (US)
42AQI (US)
41AQI (US)
47AQI (US)
61AQI (US)
56AQI (US)
52AQI (US)
42AQI (US)
45AQI (US)
58AQI (US)
48AQI (US)
35AQI (US)
36AQI (US)
50AQI (US)
34AQI (US)
64AQI (US)
72AQI (US)
68AQI (US)
58AQI (US)
164AQI (US)
242AQI (US)
238AQI (US)
132AQI (US)
39AQI (US)
56AQI (US)
48AQI (US)
35AQI (US)
35AQI (US)
34AQI (US)
83AQI (US)
No. of days
202645AQI (US)
Highest AQI (US) recorded in
July83AQI (US)
Lowest AQI (US) recorded in
June34AQI (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) (45) shows an average percentage change of 27.1% (worsened AQI (US)) compared to previous years: 2020 (32), 2021 (37), 2022 (35), 2023 (42), 2024 (33), 2025 (35).