Chatham, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Chatham, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (30th September):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 28 of Good air quality, showing improvement over 2025 and 2023 on the same day.
Day & Night AQI Trend: 29th Sep - 30th Sep 2026
Chatham, Ontario, Canada
7 AM29th Sep 2026
7 PM
6 AM30th Sep 2026
53AQI
22AQI
62AQI
25AQI
In the last 24 hours,
Chatham's AQI reached its highest point of 62 at 10 PM during the Night, while the lowest point, 22, was recorded at 2 PM during the Day between 29th Sep and 30th Sep 2026.
Day & Night AQI Trend : Sep 2026
Chatham, Ontario, Canada
27°C21/35°C
29°C23/37°C
24°C21/29°C
22°C18/25°C
22°C18/28°C
20°C13/27°C
20°C14/28°C
20°C13/28°C
23°C20/27°C
22°C18/26°C
18°C12/25°C
21°C13/29°C
21°C15/25°C
15°C12/20°C
21°C17/25°C
20°C18/24°C
18°C17/22°C
18°C15/23°C
16°C15/19°C
16°C14/19°C
14°C10/18°C
13°C9/20°C
15°C11/19°C
15°C13/19°C
14°C10/20°C
15°C10/21°C
16°C12/22°C
17°C14/22°C
17°C14/21°C
19°C16/21°C
38AQI
31AQI
36AQI
32AQI
2026 Days Vs Air Quality
Chatham, Ontario, Canada
92%
249
8%
21
Total number of days with different AQI categories in last 273 days in 2026 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2026, 92% of 273 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Chatham, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
14AQI (US)
18AQI (US)
23AQI (US)
25AQI (US)
51AQI (US)
67AQI (US)
50AQI (US)
50AQI (US)
22AQI (US)
16AQI (US)
16AQI (US)
22AQI (US)
34AQI (US)
20AQI (US)
14AQI (US)
21AQI (US)
32AQI (US)
24AQI (US)
32AQI (US)
30AQI (US)
30AQI (US)
58AQI (US)
60AQI (US)
48AQI (US)
50AQI (US)
47AQI (US)
38AQI (US)
44AQI (US)
50AQI (US)
58AQI (US)
43AQI (US)
45AQI (US)
52AQI (US)
48AQI (US)
44AQI (US)
51AQI (US)
49AQI (US)
40AQI (US)
42AQI (US)
47AQI (US)
43AQI (US)
39AQI (US)
38AQI (US)
46AQI (US)
50AQI (US)
46AQI (US)
46AQI (US)
57AQI (US)
43AQI (US)
42AQI (US)
42AQI (US)
36AQI (US)
36AQI (US)
36AQI (US)
44AQI (US)
44AQI (US)
34AQI (US)
35AQI (US)
34AQI (US)
38AQI (US)
57AQI (US)
44AQI (US)
46AQI (US)
42AQI (US)
36AQI (US)
39AQI (US)
38AQI (US)
36AQI (US)
34AQI (US)
42AQI (US)
38AQI (US)
41AQI (US)
35AQI (US)
32AQI (US)
37AQI (US)
34AQI (US)
31AQI (US)
38AQI (US)
42AQI (US)
40AQI (US)
36AQI (US)
40AQI (US)
36AQI (US)
32AQI (US)
37AQI (US)
29AQI (US)
30AQI (US)
29AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
29AQI (US)
29AQI (US)
32AQI (US)
30AQI (US)
30AQI (US)
27AQI (US)
34AQI (US)
29AQI (US)
31AQI (US)
30AQI (US)
29AQI (US)
31AQI (US)
37AQI (US)
36AQI (US)
32AQI (US)
29AQI (US)
32AQI (US)
28AQI (US)
28AQI (US)
24AQI (US)
24AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
26AQI (US)
24AQI (US)
26AQI (US)
25AQI (US)
23AQI (US)
22AQI (US)
35AQI (US)
38AQI (US)
31AQI (US)
26AQI (US)
30AQI (US)
30AQI (US)
27AQI (US)
28AQI (US)
32AQI (US)
22AQI (US)
46AQI (US)
48AQI (US)
54AQI (US)
56AQI (US)
52AQI (US)
42AQI (US)
40AQI (US)
42AQI (US)
50AQI (US)
41AQI (US)
42AQI (US)
29AQI (US)
28AQI (US)
22AQI (US)
24AQI (US)
22AQI (US)
28AQI (US)
30AQI (US)
28AQI (US)
34AQI (US)
26AQI (US)
32AQI (US)
26AQI (US)
24AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
26AQI (US)
26AQI (US)
24AQI (US)
23AQI (US)
24AQI (US)
27AQI (US)
26AQI (US)
27AQI (US)
24AQI (US)
23AQI (US)
20AQI (US)
22AQI (US)
23AQI (US)
24AQI (US)
19AQI (US)
26AQI (US)
31AQI (US)
28AQI (US)
24AQI (US)
27AQI (US)
53AQI (US)
48AQI (US)
30AQI (US)
25AQI (US)
28AQI (US)
28AQI (US)
30AQI (US)
27AQI (US)
28AQI (US)
31AQI (US)
30AQI (US)
38AQI (US)
30AQI (US)
30AQI (US)
41AQI (US)
82AQI (US)
88AQI (US)
60AQI (US)
83AQI (US)
74AQI (US)
66AQI (US)
28AQI (US)
30AQI (US)
32AQI (US)
28AQI (US)
39AQI (US)
52AQI (US)
54AQI (US)
28AQI (US)
36AQI (US)
46AQI (US)
48AQI (US)
29AQI (US)
39AQI (US)
36AQI (US)
36AQI (US)
33AQI (US)
32AQI (US)
36AQI (US)
30AQI (US)
33AQI (US)
37AQI (US)
38AQI (US)
41AQI (US)
38AQI (US)
29AQI (US)
34AQI (US)
32AQI (US)
28AQI (US)
26AQI (US)
33AQI (US)
30AQI (US)
28AQI (US)
36AQI (US)
40AQI (US)
28AQI (US)
26AQI (US)
28AQI (US)
40AQI (US)
35AQI (US)
26AQI (US)
35AQI (US)
42AQI (US)
40AQI (US)
32AQI (US)
32AQI (US)
28AQI (US)
36AQI (US)
30AQI (US)
35AQI (US)
28AQI (US)
32AQI (US)
40AQI (US)
35AQI (US)
32AQI (US)
34AQI (US)
37AQI (US)
32AQI (US)
34AQI (US)
40AQI (US)
34AQI (US)
32AQI (US)
32AQI (US)
32AQI (US)
30AQI (US)
31AQI (US)
36AQI (US)
40AQI (US)
41AQI (US)
33AQI (US)
36AQI (US)
28AQI (US)
36AQI (US)
43AQI (US)
37AQI (US)
29AQI (US)
35AQI (US)
26AQI (US)
43AQI (US)
34AQI (US)
34AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
February43AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202534AQI (US)
Highest AQI (US) recorded in
June48AQI (US)
Lowest AQI (US) recorded in
May21AQI (US)
202433AQI (US)
Highest AQI (US) recorded in
January37AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202340AQI (US)
Highest AQI (US) recorded in
June75AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202234AQI (US)
Highest AQI (US) recorded in
June47AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202135AQI (US)
Highest AQI (US) recorded in
August43AQI (US)
Lowest AQI (US) recorded in
November27AQI (US)
202034AQI (US)
Highest AQI (US) recorded in
June39AQI (US)
Lowest AQI (US) recorded in
October28AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Chatham's annual 2026 AQI (US) (35) shows an average percentage change of 0.3% (worsened AQI (US)) compared to previous years: 2020 (34), 2021 (35), 2022 (34), 2023 (40), 2024 (33), 2025 (34).