Sion, Valais, Switzerland 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
Sion, Valais, Switzerland
AQI Trends: Highest and Lowest
Same Day Analysis (2nd July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 33 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Sion, Valais, Switzerland
5 AM2nd Jul 2025
9 PM
4 AM3rd Jul 2025
37AQI
30AQI
33AQI
30AQI
In the last 24 hours,
Sion's AQI reached its highest point of 37 at 8 AM during the Day, while the lowest point, 30, was recorded at 3 AM during the Night between 2nd Jul and 3rd Jul 2025.
Day & Night AQI Trend : Jun - Jul 2025
Sion, Valais, Switzerland
13°C7/18°C
13°C9/19°C
11°C7/15°C
13°C8/19°C
11°C7/15°C
10°C5/16°C
11°C3/19°C
14°C7/21°C
15°C8/22°C
18°C11/25°C
17°C11/26°C
17°C11/24°C
15°C10/23°C
13°C8/19°C
14°C6/21°C
16°C9/23°C
17°C11/24°C
17°C11/24°C
15°C10/23°C
16°C9/23°C
16°C12/21°C
16°C10/23°C
19°C12/26°C
15°C11/19°C
15°C9/22°C
18°C11/25°C
19°C13/27°C
18°C13/24°C
16°C12/23°C
16°C11/23°C
0°C0/0°C
46AQI
46AQI
46AQI
44AQI
2025 Days Vs Air Quality
Sion, Valais, Switzerland
77%
140
23%
43
Total number of days with different AQI categories in last 184 days in 2025 (181 days remaining)
Under WHO’s Safe Air Quality Limits: 77%
Health Risk Level:
Low
In 2025, 77% of 184 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
Sion, Valais, Switzerland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
78AQI
49AQI
34AQI
46AQI
54AQI
40AQI
28AQI
29AQI
29AQI
29AQI
34AQI
43AQI
44AQI
58AQI
68AQI
61AQI
68AQI
71AQI
87AQI
78AQI
65AQI
65AQI
46AQI
42AQI
37AQI
28AQI
27AQI
22AQI
24AQI
31AQI
34AQI
40AQI
47AQI
49AQI
59AQI
64AQI
70AQI
71AQI
64AQI
72AQI
68AQI
60AQI
48AQI
49AQI
42AQI
57AQI
64AQI
76AQI
82AQI
82AQI
71AQI
61AQI
54AQI
47AQI
50AQI
43AQI
28AQI
31AQI
31AQI
37AQI
48AQI
54AQI
51AQI
48AQI
48AQI
50AQI
53AQI
56AQI
42AQI
33AQI
29AQI
24AQI
28AQI
46AQI
22AQI
30AQI
33AQI
31AQI
31AQI
38AQI
25AQI
19AQI
23AQI
25AQI
41AQI
42AQI
39AQI
44AQI
36AQI
28AQI
28AQI
32AQI
32AQI
34AQI
33AQI
30AQI
28AQI
35AQI
36AQI
35AQI
35AQI
35AQI
37AQI
28AQI
22AQI
21AQI
22AQI
31AQI
20AQI
18AQI
15AQI
17AQI
20AQI
15AQI
18AQI
18AQI
24AQI
22AQI
28AQI
26AQI
33AQI
35AQI
38AQI
25AQI
18AQI
18AQI
31AQI
42AQI
47AQI
26AQI
25AQI
20AQI
19AQI
22AQI
27AQI
25AQI
18AQI
24AQI
31AQI
29AQI
24AQI
20AQI
22AQI
20AQI
21AQI
21AQI
19AQI
21AQI
19AQI
18AQI
22AQI
27AQI
29AQI
26AQI
30AQI
23AQI
24AQI
20AQI
44AQI
60AQI
74AQI
90AQI
75AQI
65AQI
56AQI
55AQI
33AQI
38AQI
46AQI
50AQI
56AQI
52AQI
55AQI
54AQI
51AQI
47AQI
49AQI
40AQI
31AQI
32AQI
39AQI
33AQI
33AQI
47AQI
56AQI
37AQI
27AQI
25AQI
46AQI
33AQI
No. of days
202539AQI
Highest AQI recorded in
February56AQI
Lowest AQI recorded in
May25AQI
202427AQI
Highest AQI recorded in
December46AQI
Lowest AQI recorded in
October19AQI
202325AQI
Highest AQI recorded in
June34AQI
Lowest AQI recorded in
November18AQI
202224AQI
Highest AQI recorded in
July33AQI
Lowest AQI recorded in
October17AQI
202122AQI
Highest AQI recorded in
April29AQI
Lowest AQI recorded in
October15AQI
202023AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
October14AQI
Most & Least Polluted Years Over the Last 6 Years
Sion's annual 2025 AQI (39) shows an average percentage change of 63.6% (worsened AQI) compared to previous years: 2020 (23), 2021 (22), 2022 (24), 2023 (25), 2024 (27).