Koencho, Hokkaido, Japan 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
Koencho, Hokkaido, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (2nd June):
On this day, AQI across the 4 years varied significantly: 2026 ranks 1st highest AQI at 46 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 1st Jun - 2nd Jun 2026
Koencho, Hokkaido, Japan
3 AM1st Jun 2026
6 PM
2 AM2nd Jun 2026
31AQI
19AQI
34AQI
23AQI
In the last 24 hours,
Koencho's AQI reached its highest point of 34 at 12 AM during the Night, while the lowest point, 19, was recorded at 7 AM during the Day between 1st Jun and 2nd Jun 2026.
Day & Night AQI Trend : May - Jun 2026
Koencho, Hokkaido, Japan
4°C0/6°C
8°C0/16°C
14°C7/23°C
12°C7/22°C
9°C7/12°C
4°C0/6°C
9°C1/19°C
13°C4/21°C
15°C7/24°C
8°C2/18°C
7°C2/13°C
12°C4/25°C
13°C4/24°C
8°C4/11°C
12°C7/20°C
7°C4/8°C
11°C5/18°C
8°C3/11°C
7°C0/15°C
12°C2/20°C
11°C5/18°C
14°C10/19°C
16°C11/22°C
17°C12/24°C
16°C14/21°C
14°C8/20°C
13°C7/18°C
14°C6/22°C
19°C10/29°C
19°C13/28°C
51AQI
38AQI
50AQI
37AQI
2026 Days Vs Air Quality
Koencho, Hokkaido, Japan
76%
116
24%
37
Total number of days with different AQI categories in last 153 days in 2026 (212 days remaining)
Under WHO’s Safe Air Quality Limits: 76%
Health Risk Level:
Low
In 2026, 76% of 153 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
Koencho, Hokkaido, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI (US)
24AQI (US)
17AQI (US)
20AQI (US)
26AQI (US)
25AQI (US)
33AQI (US)
27AQI (US)
27AQI (US)
29AQI (US)
27AQI (US)
13AQI (US)
22AQI (US)
30AQI (US)
26AQI (US)
44AQI (US)
25AQI (US)
20AQI (US)
30AQI (US)
24AQI (US)
16AQI (US)
20AQI (US)
36AQI (US)
39AQI (US)
24AQI (US)
44AQI (US)
44AQI (US)
19AQI (US)
21AQI (US)
49AQI (US)
16AQI (US)
15AQI (US)
36AQI (US)
33AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
12AQI (US)
19AQI (US)
44AQI (US)
52AQI (US)
70AQI (US)
23AQI (US)
24AQI (US)
65AQI (US)
43AQI (US)
18AQI (US)
21AQI (US)
24AQI (US)
33AQI (US)
30AQI (US)
55AQI (US)
46AQI (US)
20AQI (US)
26AQI (US)
40AQI (US)
52AQI (US)
46AQI (US)
48AQI (US)
46AQI (US)
72AQI (US)
54AQI (US)
69AQI (US)
68AQI (US)
55AQI (US)
52AQI (US)
59AQI (US)
56AQI (US)
57AQI (US)
56AQI (US)
72AQI (US)
48AQI (US)
50AQI (US)
65AQI (US)
48AQI (US)
48AQI (US)
43AQI (US)
53AQI (US)
40AQI (US)
35AQI (US)
54AQI (US)
63AQI (US)
34AQI (US)
35AQI (US)
31AQI (US)
37AQI (US)
49AQI (US)
61AQI (US)
67AQI (US)
57AQI (US)
27AQI (US)
30AQI (US)
56AQI (US)
55AQI (US)
24AQI (US)
22AQI (US)
30AQI (US)
25AQI (US)
47AQI (US)
56AQI (US)
36AQI (US)
33AQI (US)
30AQI (US)
42AQI (US)
44AQI (US)
32AQI (US)
42AQI (US)
39AQI (US)
39AQI (US)
32AQI (US)
43AQI (US)
43AQI (US)
16AQI (US)
23AQI (US)
53AQI (US)
47AQI (US)
34AQI (US)
25AQI (US)
28AQI (US)
39AQI (US)
41AQI (US)
41AQI (US)
40AQI (US)
34AQI (US)
25AQI (US)
36AQI (US)
33AQI (US)
23AQI (US)
27AQI (US)
34AQI (US)
34AQI (US)
44AQI (US)
43AQI (US)
35AQI (US)
35AQI (US)
80AQI (US)
67AQI (US)
57AQI (US)
54AQI (US)
64AQI (US)
65AQI (US)
76AQI (US)
70AQI (US)
69AQI (US)
65AQI (US)
45AQI (US)
23AQI (US)
28AQI (US)
24AQI (US)
22AQI (US)
26AQI (US)
25AQI (US)
46AQI (US)
27AQI (US)
36AQI (US)
53AQI (US)
36AQI (US)
44AQI (US)
36AQI (US)
No. of days
202639AQI (US)
Highest AQI (US) recorded in
March53AQI (US)
Lowest AQI (US) recorded in
January27AQI (US)
202536AQI (US)
Highest AQI (US) recorded in
January41AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
202331AQI (US)
Highest AQI (US) recorded in
February41AQI (US)
Lowest AQI (US) recorded in
September21AQI (US)
202227AQI (US)
Highest AQI (US) recorded in
November34AQI (US)
Lowest AQI (US) recorded in
August13AQI (US)
202129AQI (US)
Highest AQI (US) recorded in
January43AQI (US)
Lowest AQI (US) recorded in
May20AQI (US)
202025AQI (US)
Highest AQI (US) recorded in
December36AQI (US)
Lowest AQI (US) recorded in
November19AQI (US)
Most & Least Polluted Years Over the Last 6 Years
Koencho's annual 2026 AQI (US) (39) shows an average percentage change of 33.8% (worsened AQI (US)) compared to previous years: 2020 (25), 2021 (29), 2022 (27), 2023 (31), 2025 (36).