Peterborough, 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
Peterborough, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (2nd July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 33 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Peterborough, Ontario, Canada
5 AM2nd Jul 2025
9 PM
4 AM3rd Jul 2025
42AQI
24AQI
42AQI
35AQI
In the last 24 hours,
Peterborough's AQI reached its highest point of 42 at 4 PM during the Day, while the lowest point, 24, was recorded at 5 AM during the Day between 2nd Jul and 3rd Jul 2025.
Day & Night AQI Trend : Jun - Jul 2025
Peterborough, Ontario, Canada
19°C10/27°C
21°C12/30°C
18°C15/22°C
19°C12/25°C
21°C14/28°C
18°C11/23°C
17°C15/20°C
17°C14/21°C
18°C10/24°C
17°C11/24°C
14°C8/19°C
18°C12/25°C
19°C12/24°C
19°C10/25°C
20°C13/28°C
22°C17/27°C
19°C15/24°C
18°C12/26°C
20°C12/28°C
27°C21/33°C
28°C21/36°C
27°C22/35°C
25°C18/32°C
17°C14/21°C
18°C13/23°C
21°C14/26°C
19°C11/28°C
22°C14/30°C
23°C18/29°C
22°C15/31°C
0°C0/0°C
42AQI
42AQI
42AQI
42AQI
2025 Days Vs Air Quality
Peterborough, Ontario, Canada
91%
167
9%
16
Total number of days with different AQI categories in last 184 days in 2025 (181 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 184 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
Peterborough, Ontario, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI
20AQI
23AQI
28AQI
27AQI
23AQI
23AQI
25AQI
27AQI
33AQI
45AQI
56AQI
34AQI
27AQI
22AQI
45AQI
36AQI
28AQI
24AQI
25AQI
28AQI
27AQI
38AQI
39AQI
44AQI
32AQI
27AQI
28AQI
27AQI
25AQI
42AQI
29AQI
30AQI
40AQI
23AQI
26AQI
30AQI
27AQI
29AQI
28AQI
28AQI
30AQI
27AQI
26AQI
28AQI
30AQI
27AQI
27AQI
26AQI
21AQI
20AQI
27AQI
42AQI
54AQI
55AQI
64AQI
28AQI
30AQI
27AQI
28AQI
27AQI
33AQI
40AQI
35AQI
23AQI
32AQI
31AQI
29AQI
29AQI
29AQI
27AQI
27AQI
46AQI
54AQI
30AQI
15AQI
22AQI
31AQI
24AQI
16AQI
17AQI
19AQI
20AQI
18AQI
18AQI
20AQI
18AQI
16AQI
18AQI
19AQI
17AQI
17AQI
21AQI
17AQI
19AQI
16AQI
18AQI
15AQI
17AQI
32AQI
25AQI
27AQI
27AQI
28AQI
21AQI
14AQI
16AQI
32AQI
41AQI
16AQI
19AQI
15AQI
15AQI
26AQI
26AQI
20AQI
13AQI
22AQI
28AQI
14AQI
26AQI
21AQI
14AQI
19AQI
17AQI
16AQI
22AQI
15AQI
20AQI
20AQI
19AQI
24AQI
32AQI
22AQI
22AQI
30AQI
31AQI
16AQI
13AQI
13AQI
16AQI
12AQI
11AQI
11AQI
14AQI
19AQI
25AQI
24AQI
19AQI
26AQI
23AQI
14AQI
18AQI
35AQI
60AQI
43AQI
60AQI
66AQI
78AQI
58AQI
48AQI
59AQI
65AQI
36AQI
31AQI
32AQI
37AQI
27AQI
29AQI
33AQI
31AQI
51AQI
53AQI
53AQI
53AQI
41AQI
35AQI
31AQI
28AQI
28AQI
32AQI
32AQI
33AQI
31AQI
31AQI
26AQI
21AQI
20AQI
42AQI
33AQI
No. of days
202528AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
May20AQI
202429AQI
Highest AQI recorded in
August34AQI
Lowest AQI recorded in
November18AQI
202337AQI
Highest AQI recorded in
June71AQI
Lowest AQI recorded in
October28AQI
202233AQI
Highest AQI recorded in
May37AQI
Lowest AQI recorded in
August21AQI
202133AQI
Highest AQI recorded in
August40AQI
Lowest AQI recorded in
October25AQI
202030AQI
Highest AQI recorded in
May36AQI
Lowest AQI recorded in
October22AQI
Most & Least Polluted Years Over the Last 6 Years
Peterborough's annual 2025 AQI (28) shows an average percentage change of -11.3% (improved AQI) compared to previous years: 2020 (30), 2021 (33), 2022 (33), 2023 (37), 2024 (29).