Saint John, New Brunswick, 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
Saint John, New Brunswick, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (15th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 23 of Good air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Saint John, New Brunswick, Canada
6 AM16th Sep 2025
8 PM
5 AM17th Sep 2025
25AQI
23AQI
25AQI
23AQI
In the last 24 hours,
Saint John's AQI reached its highest point of 25 at 6 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 16th Sep and 17th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Saint John, New Brunswick, Canada
16°C10/22°C
15°C8/22°C
15°C10/22°C
16°C8/23°C
17°C10/25°C
16°C9/22°C
15°C13/21°C
17°C14/20°C
16°C12/19°C
16°C9/23°C
16°C11/23°C
14°C11/19°C
14°C9/18°C
16°C12/23°C
15°C7/21°C
15°C10/24°C
14°C9/19°C
14°C11/17°C
15°C11/18°C
16°C15/17°C
15°C14/17°C
16°C12/20°C
14°C5/22°C
13°C5/18°C
18°C10/25°C
15°C11/22°C
11°C5/17°C
15°C11/19°C
14°C7/21°C
15°C8/23°C
--°C/°C
24AQI
22AQI
24AQI
23AQI
2025 Days Vs Air Quality
Saint John, New Brunswick, Canada
97%
250
3%
8
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2025, 97% of 260 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
Saint John, New Brunswick, Canada
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
22AQI
26AQI
23AQI
23AQI
24AQI
22AQI
22AQI
26AQI
25AQI
23AQI
24AQI
29AQI
32AQI
24AQI
25AQI
37AQI
33AQI
24AQI
23AQI
26AQI
28AQI
36AQI
31AQI
26AQI
31AQI
25AQI
28AQI
25AQI
28AQI
27AQI
26AQI
25AQI
26AQI
23AQI
26AQI
29AQI
24AQI
26AQI
26AQI
30AQI
30AQI
27AQI
25AQI
26AQI
27AQI
26AQI
26AQI
23AQI
22AQI
22AQI
26AQI
28AQI
29AQI
35AQI
45AQI
31AQI
29AQI
31AQI
32AQI
29AQI
28AQI
35AQI
45AQI
28AQI
24AQI
29AQI
28AQI
28AQI
27AQI
30AQI
23AQI
22AQI
23AQI
19AQI
28AQI
16AQI
23AQI
18AQI
14AQI
20AQI
30AQI
18AQI
19AQI
27AQI
21AQI
19AQI
16AQI
18AQI
17AQI
22AQI
22AQI
19AQI
21AQI
15AQI
16AQI
17AQI
18AQI
16AQI
16AQI
11AQI
12AQI
10AQI
11AQI
10AQI
10AQI
11AQI
11AQI
13AQI
13AQI
13AQI
16AQI
14AQI
15AQI
18AQI
20AQI
15AQI
15AQI
25AQI
26AQI
16AQI
21AQI
22AQI
24AQI
17AQI
18AQI
16AQI
19AQI
15AQI
14AQI
16AQI
17AQI
20AQI
21AQI
27AQI
27AQI
23AQI
16AQI
15AQI
12AQI
15AQI
18AQI
16AQI
14AQI
13AQI
15AQI
22AQI
28AQI
30AQI
23AQI
19AQI
27AQI
28AQI
27AQI
35AQI
37AQI
46AQI
45AQI
48AQI
51AQI
40AQI
31AQI
56AQI
36AQI
25AQI
28AQI
26AQI
24AQI
22AQI
20AQI
24AQI
19AQI
22AQI
33AQI
46AQI
49AQI
22AQI
21AQI
23AQI
17AQI
20AQI
28AQI
27AQI
34AQI
36AQI
24AQI
35AQI
46AQI
22AQI
22AQI
29AQI
26AQI
25AQI
21AQI
19AQI
23AQI
32AQI
21AQI
19AQI
26AQI
28AQI
26AQI
18AQI
29AQI
27AQI
41AQI
53AQI
55AQI
54AQI
42AQI
48AQI
57AQI
24AQI
24AQI
38AQI
53AQI
41AQI
23AQI
29AQI
44AQI
31AQI
26AQI
31AQI
43AQI
57AQI
34AQI
24AQI
22AQI
24AQI
14AQI
15AQI
18AQI
24AQI
26AQI
29AQI
37AQI
28AQI
19AQI
21AQI
22AQI
25AQI
24AQI
21AQI
27AQI
32AQI
29AQI
23AQI
20AQI
24AQI
22AQI
22AQI
21AQI
22AQI
25AQI
20AQI
19AQI
20AQI
23AQI
27AQI
27AQI
24AQI
16AQI
19AQI
32AQI
32AQI
29AQI
23AQI
No. of days
202526AQI
Highest AQI recorded in
July32AQI
Lowest AQI recorded in
April16AQI
202426AQI
Highest AQI recorded in
February30AQI
Lowest AQI recorded in
November17AQI
202330AQI
Highest AQI recorded in
March34AQI
Lowest AQI recorded in
November26AQI
202229AQI
Highest AQI recorded in
February34AQI
Lowest AQI recorded in
September25AQI
202128AQI
Highest AQI recorded in
March33AQI
Lowest AQI recorded in
October20AQI
202024AQI
Highest AQI recorded in
March32AQI
Lowest AQI recorded in
September20AQI
Most & Least Polluted Years Over the Last 6 Years
Saint John's annual 2025 AQI (26) shows an average percentage change of -6.1% (improved AQI) compared to previous years: 2020 (24), 2021 (28), 2022 (29), 2023 (30), 2024 (26).