Downtown, Calgary, Alberta, 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
Downtown, Calgary, Alberta, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 43 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Downtown, Calgary, Alberta, Canada
7 AM4th Oct 2025
7 PM
6 AM5th Oct 2025
50AQI
20AQI
34AQI
12AQI
In the last 24 hours,
Downtown's AQI reached its highest point of 50 at 7 AM during the Day, while the lowest point, 12, was recorded at 2 AM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Downtown, Calgary, Alberta, Canada
14°C6/23°C
19°C9/29°C
21°C13/31°C
20°C15/28°C
20°C12/29°C
19°C12/28°C
20°C11/28°C
20°C12/29°C
20°C12/28°C
19°C11/29°C
18°C14/21°C
18°C11/27°C
18°C10/27°C
17°C10/24°C
17°C9/24°C
20°C11/30°C
18°C13/25°C
15°C8/23°C
21°C14/31°C
15°C8/20°C
14°C4/27°C
13°C6/20°C
15°C8/23°C
11°C5/16°C
16°C6/29°C
16°C12/23°C
12°C7/19°C
13°C8/20°C
13°C7/22°C
8°C3/12°C
--°C/°C
59AQI
52AQI
57AQI
52AQI
2025 Days Vs Air Quality
Downtown, Calgary, Alberta, Canada
79%
153
20%
39
0.5%
1
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 79%
Health Risk Level:
Low
In 2025, 79% of 278 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
Downtown, Calgary, Alberta, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
29AQI
31AQI
22AQI
31AQI
28AQI
36AQI
34AQI
27AQI
29AQI
33AQI
33AQI
40AQI
25AQI
26AQI
32AQI
31AQI
36AQI
20AQI
34AQI
31AQI
25AQI
18AQI
33AQI
29AQI
22AQI
30AQI
18AQI
30AQI
40AQI
41AQI
38AQI
35AQI
35AQI
18AQI
20AQI
34AQI
37AQI
46AQI
24AQI
15AQI
33AQI
33AQI
33AQI
27AQI
36AQI
28AQI
31AQI
28AQI
39AQI
24AQI
45AQI
37AQI
38AQI
23AQI
18AQI
16AQI
21AQI
29AQI
28AQI
33AQI
32AQI
21AQI
27AQI
38AQI
32AQI
33AQI
20AQI
21AQI
29AQI
44AQI
42AQI
35AQI
41AQI
55AQI
55AQI
57AQI
63AQI
71AQI
54AQI
31AQI
27AQI
32AQI
40AQI
45AQI
37AQI
34AQI
28AQI
26AQI
37AQI
49AQI
48AQI
34AQI
29AQI
19AQI
16AQI
25AQI
32AQI
36AQI
29AQI
25AQI
26AQI
23AQI
28AQI
33AQI
34AQI
25AQI
27AQI
34AQI
26AQI
21AQI
40AQI
49AQI
51AQI
49AQI
35AQI
29AQI
30AQI
46AQI
50AQI
46AQI
38AQI
30AQI
42AQI
48AQI
47AQI
51AQI
52AQI
55AQI
53AQI
43AQI
41AQI
41AQI
35AQI
29AQI
23AQI
28AQI
32AQI
23AQI
33AQI
35AQI
26AQI
35AQI
47AQI
24AQI
30AQI
34AQI
43AQI
27AQI
30AQI
46AQI
47AQI
53AQI
55AQI
56AQI
56AQI
55AQI
54AQI
54AQI
59AQI
67AQI
87AQI
109AQI
84AQI
98AQI
92AQI
85AQI
68AQI
63AQI
61AQI
63AQI
50AQI
61AQI
55AQI
52AQI
57AQI
58AQI
59AQI
60AQI
63AQI
39AQI
35AQI
33AQI
48AQI
46AQI
35AQI
28AQI
37AQI
52AQI
54AQI
41AQI
45AQI
43AQI
29AQI
30AQI
30AQI
38AQI
37AQI
40AQI
60AQI
46AQI
No. of days
202539AQI
Highest AQI recorded in
September60AQI
Lowest AQI recorded in
March29AQI
Most & Least Polluted Years Over the Last 1 Years
Downtown's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .