London Ontario, London, 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
London Ontario, London, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (31st July ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 37 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
2025 Days Vs Air Quality
London Ontario, London, Ontario, Canada
89%
161
11%
20
Total number of days with different AQI categories in last 182 days in 2025 (183 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 182 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
London Ontario, London, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI
24AQI
23AQI
26AQI
24AQI
22AQI
24AQI
26AQI
26AQI
49AQI
64AQI
49AQI
35AQI
27AQI
25AQI
50AQI
41AQI
28AQI
28AQI
28AQI
24AQI
29AQI
38AQI
27AQI
48AQI
30AQI
26AQI
29AQI
26AQI
27AQI
52AQI
26AQI
28AQI
54AQI
26AQI
24AQI
32AQI
29AQI
41AQI
36AQI
31AQI
48AQI
29AQI
29AQI
34AQI
42AQI
32AQI
27AQI
27AQI
25AQI
22AQI
27AQI
53AQI
56AQI
52AQI
44AQI
48AQI
49AQI
25AQI
29AQI
28AQI
30AQI
35AQI
35AQI
27AQI
30AQI
33AQI
28AQI
30AQI
30AQI
27AQI
28AQI
53AQI
54AQI
22AQI
16AQI
24AQI
33AQI
25AQI
17AQI
16AQI
18AQI
20AQI
18AQI
19AQI
29AQI
35AQI
50AQI
39AQI
20AQI
17AQI
18AQI
23AQI
19AQI
21AQI
18AQI
19AQI
14AQI
22AQI
26AQI
35AQI
29AQI
37AQI
29AQI
17AQI
16AQI
23AQI
38AQI
43AQI
19AQI
23AQI
15AQI
31AQI
43AQI
41AQI
20AQI
17AQI
25AQI
33AQI
17AQI
30AQI
30AQI
18AQI
21AQI
21AQI
21AQI
29AQI
23AQI
26AQI
30AQI
24AQI
29AQI
29AQI
18AQI
26AQI
30AQI
24AQI
16AQI
16AQI
17AQI
19AQI
15AQI
11AQI
11AQI
20AQI
24AQI
28AQI
20AQI
29AQI
33AQI
28AQI
18AQI
29AQI
35AQI
67AQI
57AQI
67AQI
68AQI
87AQI
67AQI
56AQI
62AQI
69AQI
53AQI
39AQI
39AQI
37AQI
38AQI
36AQI
27AQI
34AQI
41AQI
45AQI
52AQI
54AQI
46AQI
45AQI
41AQI
32AQI
35AQI
39AQI
32AQI
36AQI
29AQI
25AQI
23AQI
47AQI
No. of days
202532AQI
Highest AQI recorded in
June47AQI
Lowest AQI recorded in
May23AQI
202433AQI
Highest AQI recorded in
February39AQI
Lowest AQI recorded in
November26AQI
202343AQI
Highest AQI recorded in
June74AQI
Lowest AQI recorded in
October33AQI
202234AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
August20AQI
202135AQI
Highest AQI recorded in
February40AQI
Lowest AQI recorded in
September28AQI
202032AQI
Highest AQI recorded in
June37AQI
Lowest AQI recorded in
October24AQI
Most & Least Polluted Years Over the Last 6 Years
London Ontario's annual 2025 AQI (32) shows an average percentage change of -9.2% (improved AQI) compared to previous years: 2020 (32), 2021 (35), 2022 (34), 2023 (43), 2024 (33).
