Thunder Bay, Ontario, Canada Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
June Air Quality Analysis
Thunder Bay, Ontario, Canada
AQI Trends: Highest and Lowest
Same Day Analysis (2nd June):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 31 of Good air quality, showing improvement over 2024, 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 1st Jun - 2nd Jun 2026
Thunder Bay, Ontario, Canada
6 AM1st Jun 2026
9 PM
5 AM2nd Jun 2026
38AQI
22AQI
33AQI
30AQI
In the last 24 hours,
Thunder Bay's AQI reached its highest point of 38 at 11 AM during the Day, while the lowest point, 22, was recorded at 10 AM during the Day between 1st Jun and 2nd Jun 2026.
Day & Night AQI Trend : May - Jun 2026
Thunder Bay, Ontario, Canada
9°C2/13°C
2°C0/4°C
2°C-3/5°C
3°C-3/7°C
6°C-4/16°C
6°C0/12°C
3°C-2/9°C
5°C-3/12°C
3°C1/5°C
9°C1/17°C
10°C0/20°C
17°C8/28°C
14°C8/19°C
8°C1/13°C
9°C7/12°C
5°C2/7°C
4°C-1/11°C
8°C1/18°C
9°C0/17°C
10°C7/15°C
13°C7/23°C
11°C4/23°C
17°C8/28°C
16°C8/24°C
16°C6/25°C
20°C8/33°C
15°C10/20°C
14°C5/26°C
15°C6/23°C
17°C6/28°C
43AQI
32AQI
39AQI
33AQI
2026 Days Vs Air Quality
Thunder Bay, Ontario, Canada
93%
139
7%
11
Total number of days with different AQI categories in last 153 days in 2026 (212 days remaining)
Under WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2026, 93% of 153 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
Thunder Bay, Ontario, Canada
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
14AQI (US)
16AQI (US)
26AQI (US)
31AQI (US)
41AQI (US)
23AQI (US)
48AQI (US)
26AQI (US)
19AQI (US)
10AQI (US)
17AQI (US)
26AQI (US)
16AQI (US)
17AQI (US)
20AQI (US)
10AQI (US)
11AQI (US)
12AQI (US)
14AQI (US)
28AQI (US)
54AQI (US)
60AQI (US)
50AQI (US)
52AQI (US)
48AQI (US)
35AQI (US)
43AQI (US)
48AQI (US)
51AQI (US)
40AQI (US)
50AQI (US)
54AQI (US)
49AQI (US)
46AQI (US)
52AQI (US)
46AQI (US)
35AQI (US)
41AQI (US)
46AQI (US)
47AQI (US)
37AQI (US)
36AQI (US)
50AQI (US)
48AQI (US)
46AQI (US)
42AQI (US)
46AQI (US)
42AQI (US)
42AQI (US)
39AQI (US)
37AQI (US)
35AQI (US)
35AQI (US)
40AQI (US)
36AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
35AQI (US)
50AQI (US)
42AQI (US)
44AQI (US)
42AQI (US)
35AQI (US)
44AQI (US)
38AQI (US)
38AQI (US)
37AQI (US)
40AQI (US)
38AQI (US)
40AQI (US)
37AQI (US)
31AQI (US)
33AQI (US)
34AQI (US)
30AQI (US)
37AQI (US)
44AQI (US)
43AQI (US)
34AQI (US)
40AQI (US)
36AQI (US)
32AQI (US)
30AQI (US)
27AQI (US)
29AQI (US)
29AQI (US)
27AQI (US)
26AQI (US)
27AQI (US)
30AQI (US)
28AQI (US)
29AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
28AQI (US)
27AQI (US)
32AQI (US)
32AQI (US)
29AQI (US)
33AQI (US)
32AQI (US)
33AQI (US)
29AQI (US)
27AQI (US)
32AQI (US)
28AQI (US)
27AQI (US)
23AQI (US)
24AQI (US)
28AQI (US)
34AQI (US)
27AQI (US)
24AQI (US)
23AQI (US)
27AQI (US)
26AQI (US)
25AQI (US)
20AQI (US)
34AQI (US)
36AQI (US)
29AQI (US)
25AQI (US)
31AQI (US)
31AQI (US)
26AQI (US)
24AQI (US)
25AQI (US)
21AQI (US)
50AQI (US)
67AQI (US)
56AQI (US)
57AQI (US)
55AQI (US)
52AQI (US)
45AQI (US)
39AQI (US)
46AQI (US)
43AQI (US)
41AQI (US)
33AQI (US)
28AQI (US)
22AQI (US)
24AQI (US)
24AQI (US)
29AQI (US)
32AQI (US)
31AQI (US)
30AQI (US)
42AQI (US)
36AQI (US)
28AQI (US)
35AQI (US)
32AQI (US)
No. of days
202634AQI (US)
Highest AQI (US) recorded in
February42AQI (US)
Lowest AQI (US) recorded in
April28AQI (US)
202531AQI (US)
Highest AQI (US) recorded in
July50AQI (US)
Lowest AQI (US) recorded in
May21AQI (US)
202430AQI (US)
Highest AQI (US) recorded in
September57AQI (US)
Lowest AQI (US) recorded in
November18AQI (US)
202329AQI (US)
Highest AQI (US) recorded in
August38AQI (US)
Lowest AQI (US) recorded in
October20AQI (US)
202227AQI (US)
Highest AQI (US) recorded in
February30AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202130AQI (US)
Highest AQI (US) recorded in
July47AQI (US)
Lowest AQI (US) recorded in
October20AQI (US)
202027AQI (US)
Highest AQI (US) recorded in
March37AQI (US)
Lowest AQI (US) recorded in
August22AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Thunder Bay's annual 2026 AQI (US) (34) shows an average percentage change of 17.5% (worsened AQI (US)) compared to previous years: 2020 (27), 2021 (30), 2022 (27), 2023 (29), 2024 (30), 2025 (31).