Queenston, St. Catharines, 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
Queenston, St. Catharines, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (10th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 30 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 10th Oct - 11th Oct 2025
Queenston, St. Catharines, Ontario, Canada
7 AM10th Oct 2025
7 PM
6 AM11th Oct 2025
48AQI
17AQI
73AQI
16AQI
In the last 24 hours,
Queenston's AQI reached its highest point of 73 at 1 AM during the Night, while the lowest point, 16, was recorded at 6 AM during the Night between 10th Oct and 11th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Queenston, St. Catharines, Ontario, Canada
--°C/°C
18°C12/26°C
19°C12/26°C
18°C13/24°C
18°C12/24°C
18°C11/27°C
17°C12/24°C
19°C13/28°C
18°C14/23°C
16°C10/23°C
21°C12/31°C
22°C18/27°C
22°C18/28°C
21°C16/26°C
20°C18/22°C
20°C16/27°C
21°C14/29°C
20°C16/27°C
18°C11/27°C
17°C11/25°C
14°C8/21°C
13°C6/24°C
18°C8/28°C
21°C13/32°C
22°C14/32°C
23°C16/32°C
20°C16/22°C
13°C10/16°C
10°C6/14°C
11°C3/21°C
14°C10/18°C
37AQI
32AQI
39AQI
35AQI
2025 Days Vs Air Quality
Queenston, St. Catharines, Ontario, Canada
83%
164
17%
33
0.5%
1
Total number of days with different AQI categories in last 285 days in 2025 (80 days remaining)
Under WHO’s Safe Air Quality Limits: 83%
Health Risk Level:
Low
In 2025, 83% of 285 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
Queenston, St. Catharines, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
26AQI
25AQI
28AQI
22AQI
16AQI
19AQI
26AQI
17AQI
19AQI
18AQI
19AQI
14AQI
18AQI
27AQI
27AQI
28AQI
36AQI
26AQI
19AQI
13AQI
19AQI
33AQI
46AQI
16AQI
22AQI
16AQI
29AQI
30AQI
50AQI
34AQI
14AQI
25AQI
33AQI
19AQI
30AQI
28AQI
17AQI
17AQI
18AQI
19AQI
28AQI
17AQI
22AQI
24AQI
21AQI
27AQI
32AQI
19AQI
27AQI
27AQI
28AQI
17AQI
17AQI
14AQI
15AQI
13AQI
12AQI
13AQI
13AQI
19AQI
30AQI
23AQI
18AQI
31AQI
27AQI
16AQI
20AQI
34AQI
55AQI
48AQI
58AQI
58AQI
74AQI
60AQI
42AQI
52AQI
64AQI
40AQI
29AQI
37AQI
35AQI
33AQI
36AQI
26AQI
34AQI
48AQI
52AQI
53AQI
55AQI
45AQI
39AQI
35AQI
30AQI
35AQI
42AQI
36AQI
39AQI
47AQI
32AQI
53AQI
51AQI
47AQI
29AQI
36AQI
45AQI
52AQI
44AQI
40AQI
47AQI
58AQI
61AQI
35AQI
21AQI
27AQI
24AQI
44AQI
30AQI
24AQI
40AQI
34AQI
52AQI
38AQI
49AQI
48AQI
47AQI
76AQI
52AQI
34AQI
75AQI
107AQI
99AQI
79AQI
79AQI
83AQI
69AQI
61AQI
58AQI
55AQI
42AQI
47AQI
60AQI
57AQI
46AQI
16AQI
21AQI
20AQI
13AQI
22AQI
30AQI
28AQI
19AQI
17AQI
19AQI
24AQI
19AQI
21AQI
28AQI
37AQI
33AQI
27AQI
24AQI
36AQI
25AQI
22AQI
22AQI
23AQI
28AQI
39AQI
41AQI
49AQI
51AQI
49AQI
42AQI
41AQI
38AQI
27AQI
32AQI
23AQI
31AQI
32AQI
35AQI
26AQI
30AQI
23AQI
24AQI
32AQI
31AQI
26AQI
42AQI
47AQI
57AQI
53AQI
55AQI
27AQI
33AQI
23AQI
30AQI
24AQI
24AQI
21AQI
43AQI
42AQI
45AQI
32AQI
39AQI
No. of days
202535AQI
Highest AQI recorded in
August45AQI
Lowest AQI recorded in
May21AQI
Most & Least Polluted Years Over the Last 1 Years
Queenston's annual 2025 AQI (35) shows an average percentage change of NaN% (improved AQI) compared to previous years: .