Guelph, Ontario, 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
Guelph, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (1st October):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 33 of Good air quality, showing improvement over 2024 and 2023 on the same day.
Day & Night AQI Trend: 30th Sep - 1st Oct 2026
Guelph, Ontario, Canada
7 AM30th Sep 2026
7 PM
6 AM1st Oct 2026
48AQI
27AQI
40AQI
22AQI
In the last 24 hours,
Guelph's AQI reached its highest point of 48 at 8 AM during the Day, while the lowest point, 22, was recorded at 6 AM during the Night between 30th Sep and 1st Oct 2026.
Day & Night AQI Trend : Sep - Oct 2026
Guelph, Ontario, Canada
24°C20/32°C
22°C18/27°C
20°C15/26°C
19°C14/25°C
18°C14/23°C
18°C10/25°C
19°C10/26°C
20°C16/24°C
19°C14/25°C
16°C8/26°C
18°C10/27°C
19°C12/23°C
14°C9/18°C
17°C12/23°C
20°C16/24°C
18°C16/21°C
15°C12/21°C
13°C10/16°C
14°C10/19°C
10°C6/13°C
10°C6/15°C
12°C7/17°C
12°C9/17°C
13°C8/19°C
15°C10/20°C
16°C11/22°C
15°C12/20°C
17°C14/22°C
17°C13/22°C
18°C16/23°C
35AQI
29AQI
33AQI
30AQI
2026 Days Vs Air Quality
Guelph, Ontario, Canada
81%
220
17%
45
1%
4
0.7%
2
Total number of days with different AQI categories in last 274 days in 2026 (91 days remaining)
Under WHO’s Safe Air Quality Limits: 81%
Health Risk Level:
Low
In 2026, 81% of 274 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
Guelph, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
8AQI (US)
8AQI (US)
20AQI (US)
15AQI (US)
63AQI (US)
88AQI (US)
59AQI (US)
67AQI (US)
32AQI (US)
23AQI (US)
20AQI (US)
41AQI (US)
53AQI (US)
38AQI (US)
12AQI (US)
34AQI (US)
44AQI (US)
28AQI (US)
32AQI (US)
17AQI (US)
39AQI (US)
52AQI (US)
60AQI (US)
48AQI (US)
50AQI (US)
48AQI (US)
44AQI (US)
41AQI (US)
49AQI (US)
58AQI (US)
43AQI (US)
45AQI (US)
73AQI (US)
74AQI (US)
44AQI (US)
55AQI (US)
75AQI (US)
39AQI (US)
43AQI (US)
46AQI (US)
48AQI (US)
40AQI (US)
39AQI (US)
52AQI (US)
84AQI (US)
80AQI (US)
102AQI (US)
115AQI (US)
61AQI (US)
46AQI (US)
51AQI (US)
41AQI (US)
33AQI (US)
40AQI (US)
42AQI (US)
59AQI (US)
33AQI (US)
72AQI (US)
39AQI (US)
38AQI (US)
52AQI (US)
59AQI (US)
94AQI (US)
76AQI (US)
58AQI (US)
78AQI (US)
35AQI (US)
35AQI (US)
58AQI (US)
45AQI (US)
39AQI (US)
43AQI (US)
35AQI (US)
32AQI (US)
38AQI (US)
35AQI (US)
36AQI (US)
63AQI (US)
80AQI (US)
42AQI (US)
59AQI (US)
39AQI (US)
35AQI (US)
45AQI (US)
60AQI (US)
29AQI (US)
31AQI (US)
36AQI (US)
42AQI (US)
65AQI (US)
30AQI (US)
30AQI (US)
40AQI (US)
29AQI (US)
30AQI (US)
27AQI (US)
27AQI (US)
36AQI (US)
49AQI (US)
34AQI (US)
31AQI (US)
47AQI (US)
47AQI (US)
48AQI (US)
41AQI (US)
49AQI (US)
40AQI (US)
32AQI (US)
28AQI (US)
33AQI (US)
37AQI (US)
27AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
30AQI (US)
32AQI (US)
40AQI (US)
38AQI (US)
27AQI (US)
33AQI (US)
31AQI (US)
27AQI (US)
28AQI (US)
42AQI (US)
22AQI (US)
41AQI (US)
56AQI (US)
66AQI (US)
62AQI (US)
45AQI (US)
49AQI (US)
45AQI (US)
44AQI (US)
52AQI (US)
40AQI (US)
44AQI (US)
32AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
28AQI (US)
32AQI (US)
31AQI (US)
32AQI (US)
31AQI (US)
29AQI (US)
43AQI (US)
45AQI (US)
36AQI (US)
29AQI (US)
48AQI (US)
44AQI (US)
38AQI (US)
28AQI (US)
25AQI (US)
27AQI (US)
26AQI (US)
27AQI (US)
31AQI (US)
32AQI (US)
25AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
38AQI (US)
34AQI (US)
38AQI (US)
37AQI (US)
42AQI (US)
57AQI (US)
53AQI (US)
47AQI (US)
38AQI (US)
38AQI (US)
52AQI (US)
43AQI (US)
35AQI (US)
32AQI (US)
43AQI (US)
35AQI (US)
60AQI (US)
68AQI (US)
64AQI (US)
52AQI (US)
144AQI (US)
208AQI (US)
216AQI (US)
127AQI (US)
56AQI (US)
45AQI (US)
63AQI (US)
26AQI (US)
30AQI (US)
26AQI (US)
32AQI (US)
42AQI (US)
48AQI (US)
50AQI (US)
25AQI (US)
30AQI (US)
36AQI (US)
52AQI (US)
36AQI (US)
30AQI (US)
26AQI (US)
30AQI (US)
40AQI (US)
44AQI (US)
42AQI (US)
30AQI (US)
39AQI (US)
35AQI (US)
40AQI (US)
40AQI (US)
38AQI (US)
34AQI (US)
34AQI (US)
28AQI (US)
28AQI (US)
28AQI (US)
36AQI (US)
30AQI (US)
32AQI (US)
29AQI (US)
34AQI (US)
28AQI (US)
32AQI (US)
36AQI (US)
27AQI (US)
31AQI (US)
31AQI (US)
43AQI (US)
48AQI (US)
47AQI (US)
30AQI (US)
28AQI (US)
32AQI (US)
32AQI (US)
30AQI (US)
29AQI (US)
38AQI (US)
33AQI (US)
36AQI (US)
34AQI (US)
39AQI (US)
34AQI (US)
34AQI (US)
33AQI (US)
32AQI (US)
31AQI (US)
28AQI (US)
30AQI (US)
28AQI (US)
26AQI (US)
30AQI (US)
27AQI (US)
31AQI (US)
39AQI (US)
43AQI (US)
26AQI (US)
32AQI (US)
38AQI (US)
33AQI (US)
40AQI (US)
56AQI (US)
49AQI (US)
34AQI (US)
37AQI (US)
33AQI (US)
60AQI (US)
34AQI (US)
33AQI (US)
33AQI (US)
No. of days
202642AQI (US)
Highest AQI (US) recorded in
July60AQI (US)
Lowest AQI (US) recorded in
October33AQI (US)
202534AQI (US)
Highest AQI (US) recorded in
August48AQI (US)
Lowest AQI (US) recorded in
May22AQI (US)
202432AQI (US)
Highest AQI (US) recorded in
January37AQI (US)
Lowest AQI (US) recorded in
November25AQI (US)
202341AQI (US)
Highest AQI (US) recorded in
June68AQI (US)
Lowest AQI (US) recorded in
October31AQI (US)
202235AQI (US)
Highest AQI (US) recorded in
November43AQI (US)
Lowest AQI (US) recorded in
August19AQI (US)
202136AQI (US)
Highest AQI (US) recorded in
July40AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202033AQI (US)
Highest AQI (US) recorded in
June37AQI (US)
Lowest AQI (US) recorded in
October26AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Guelph's annual 2026 AQI (US) (42) shows an average percentage change of 20.1% (worsened AQI (US)) compared to previous years: 2020 (33), 2021 (36), 2022 (35), 2023 (41), 2024 (32), 2025 (34).