Chi, Chur, Graubunden, Switzerland Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Chi, Chur, Graubunden, Switzerland
AQI Trends: Highest and Lowest
Same Day Analysis (7th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 48 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 7th Oct - 8th Oct 2025
Chi, Chur, Graubunden, Switzerland
7 AM7th Oct 2025
7 PM
6 AM8th Oct 2025
48AQI
37AQI
60AQI
46AQI
In the last 24 hours,
Chi's AQI reached its highest point of 60 at 10 PM during the Night, while the lowest point, undefined, was recorded at 12 PM during the Day between 7th Oct and 8th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Chi, Chur, Graubunden, Switzerland
13°C9/18°C
10°C8/12°C
9°C7/10°C
9°C5/15°C
8°C7/11°C
9°C6/15°C
10°C6/15°C
13°C8/20°C
9°C6/11°C
8°C4/13°C
14°C8/22°C
17°C11/26°C
16°C11/24°C
14°C10/21°C
10°C8/14°C
9°C6/14°C
6°C4/9°C
4°C2/5°C
5°C1/11°C
5°C2/8°C
6°C1/13°C
7°C4/12°C
7°C4/11°C
4°C-1/6°C
2°C-2/9°C
4°C-1/10°C
7°C2/14°C
1°C-1/5°C
2°C0/6°C
6°C2/12°C
--°C/°C
41AQI
35AQI
38AQI
32AQI
2025 Days Vs Air Quality
Chi, Chur, Graubunden, Switzerland
76%
212
24%
66
0.7%
2
Total number of days with different AQI categories in last 281 days in 2025 (84 days remaining)
Under WHO’s Safe Air Quality Limits: 76%
Health Risk Level:
Low
In 2025, 76% of 281 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
Chi, Chur, Graubunden, Switzerland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
67AQI
67AQI
60AQI
59AQI
58AQI
53AQI
47AQI
42AQI
35AQI
32AQI
35AQI
36AQI
43AQI
51AQI
56AQI
56AQI
58AQI
59AQI
61AQI
61AQI
61AQI
60AQI
57AQI
55AQI
51AQI
45AQI
39AQI
36AQI
32AQI
33AQI
33AQI
39AQI
46AQI
48AQI
53AQI
57AQI
59AQI
58AQI
58AQI
58AQI
62AQI
65AQI
64AQI
61AQI
58AQI
60AQI
61AQI
61AQI
63AQI
65AQI
66AQI
63AQI
60AQI
59AQI
57AQI
55AQI
52AQI
47AQI
42AQI
42AQI
44AQI
45AQI
48AQI
51AQI
51AQI
52AQI
52AQI
51AQI
49AQI
47AQI
44AQI
40AQI
37AQI
36AQI
34AQI
34AQI
36AQI
38AQI
39AQI
38AQI
38AQI
35AQI
33AQI
31AQI
34AQI
35AQI
35AQI
38AQI
35AQI
32AQI
31AQI
31AQI
33AQI
34AQI
30AQI
26AQI
24AQI
27AQI
31AQI
33AQI
32AQI
29AQI
32AQI
28AQI
28AQI
23AQI
21AQI
17AQI
19AQI
19AQI
16AQI
16AQI
20AQI
16AQI
16AQI
19AQI
24AQI
26AQI
27AQI
27AQI
32AQI
44AQI
40AQI
36AQI
22AQI
21AQI
25AQI
33AQI
40AQI
30AQI
26AQI
24AQI
25AQI
28AQI
32AQI
25AQI
23AQI
28AQI
29AQI
36AQI
36AQI
28AQI
23AQI
22AQI
21AQI
21AQI
20AQI
21AQI
23AQI
40AQI
32AQI
35AQI
37AQI
36AQI
39AQI
41AQI
41AQI
34AQI
42AQI
58AQI
61AQI
65AQI
63AQI
58AQI
55AQI
54AQI
47AQI
38AQI
42AQI
45AQI
51AQI
46AQI
48AQI
44AQI
42AQI
46AQI
48AQI
37AQI
37AQI
39AQI
41AQI
37AQI
33AQI
35AQI
38AQI
38AQI
43AQI
28AQI
21AQI
20AQI
29AQI
31AQI
34AQI
47AQI
35AQI
28AQI
28AQI
23AQI
21AQI
24AQI
26AQI
22AQI
17AQI
17AQI
17AQI
17AQI
20AQI
20AQI
19AQI
20AQI
22AQI
22AQI
23AQI
22AQI
20AQI
22AQI
23AQI
24AQI
25AQI
31AQI
40AQI
49AQI
53AQI
58AQI
60AQI
57AQI
56AQI
58AQI
54AQI
51AQI
49AQI
45AQI
33AQI
27AQI
29AQI
26AQI
26AQI
29AQI
40AQI
41AQI
22AQI
17AQI
16AQI
16AQI
15AQI
17AQI
25AQI
18AQI
16AQI
19AQI
24AQI
27AQI
24AQI
20AQI
19AQI
18AQI
18AQI
17AQI
19AQI
19AQI
20AQI
23AQI
26AQI
28AQI
21AQI
18AQI
17AQI
12AQI
46AQI
149AQI
127AQI
44AQI
49AQI
53AQI
57AQI
58AQI
52AQI
37AQI
43AQI
48AQI
50AQI
57AQI
40AQI
25AQI
29AQI
46AQI
27AQI
36AQI
30AQI
50AQI
No. of days
202538AQI
Highest AQI recorded in
February57AQI
Lowest AQI recorded in
April25AQI
202426AQI
Highest AQI recorded in
December45AQI
Lowest AQI recorded in
October18AQI
202323AQI
Highest AQI recorded in
June36AQI
Lowest AQI recorded in
November16AQI
202224AQI
Highest AQI recorded in
March36AQI
Lowest AQI recorded in
November17AQI
202123AQI
Highest AQI recorded in
June30AQI
Lowest AQI recorded in
November16AQI
202022AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
October14AQI
Most & Least Polluted Years Over the Last 6 Years
Chi's annual 2025 AQI (38) shows an average percentage change of 61.1% (worsened AQI) compared to previous years: 2020 (22), 2021 (23), 2022 (24), 2023 (23), 2024 (26).