Schlieren, Zurich, Switzerland Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Schlieren, Zurich, Switzerland
AQI Trends: Highest and Lowest
Same Day Analysis (19th August ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 45 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Aug - 21st Aug 2025
Schlieren, Zurich, Switzerland
6 AM20th Aug 2025
8 PM
5 AM21st Aug 2025
49AQI
40AQI
44AQI
24AQI
In the last 24 hours,
Schlieren's AQI reached its highest point of 49 at 10 AM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 20th Aug and 21st Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Schlieren, Zurich, Switzerland
18°C13/24°C
18°C10/25°C
15°C13/18°C
15°C12/20°C
15°C11/18°C
16°C13/20°C
13°C12/14°C
15°C10/21°C
16°C9/21°C
17°C12/24°C
16°C12/21°C
14°C11/17°C
14°C9/20°C
15°C10/21°C
19°C13/27°C
16°C10/23°C
19°C11/27°C
22°C14/30°C
23°C15/32°C
22°C16/29°C
21°C13/29°C
24°C16/33°C
25°C18/34°C
24°C17/32°C
22°C16/32°C
21°C16/29°C
18°C14/22°C
18°C12/26°C
20°C13/29°C
18°C15/21°C
--°C/°C
34AQI
34AQI
33AQI
33AQI
2025 Days Vs Air Quality
Schlieren, Zurich, Switzerland
55%
126
45%
105
Total number of days with different AQI categories in last 233 days in 2025 (132 days remaining)
Under WHO’s Safe Air Quality Limits: 55%
Health Risk Level:
Considerable
In 2025, 55% of 233 days were within WHO’s safe air quality limits, and 45% exceeded them. The risk of health issues is Considerable, with potential for conditions in sensitive individuals.
Annual Air Quality Insights
Schlieren, Zurich, Switzerland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
68AQI
59AQI
59AQI
62AQI
61AQI
59AQI
56AQI
56AQI
56AQI
59AQI
60AQI
63AQI
59AQI
64AQI
67AQI
63AQI
63AQI
64AQI
68AQI
69AQI
69AQI
67AQI
62AQI
60AQI
59AQI
57AQI
56AQI
56AQI
56AQI
57AQI
57AQI
61AQI
63AQI
64AQI
67AQI
68AQI
68AQI
67AQI
70AQI
69AQI
73AQI
75AQI
67AQI
61AQI
66AQI
69AQI
70AQI
68AQI
69AQI
71AQI
73AQI
69AQI
67AQI
63AQI
62AQI
59AQI
57AQI
57AQI
57AQI
59AQI
60AQI
61AQI
63AQI
64AQI
63AQI
63AQI
64AQI
68AQI
62AQI
59AQI
58AQI
60AQI
59AQI
61AQI
58AQI
62AQI
58AQI
57AQI
59AQI
59AQI
59AQI
57AQI
58AQI
59AQI
63AQI
61AQI
61AQI
63AQI
61AQI
59AQI
58AQI
58AQI
59AQI
59AQI
49AQI
27AQI
23AQI
30AQI
35AQI
41AQI
46AQI
43AQI
41AQI
31AQI
30AQI
24AQI
18AQI
17AQI
21AQI
20AQI
16AQI
15AQI
19AQI
15AQI
17AQI
23AQI
31AQI
32AQI
33AQI
30AQI
34AQI
34AQI
36AQI
22AQI
18AQI
18AQI
25AQI
33AQI
36AQI
30AQI
25AQI
19AQI
19AQI
28AQI
30AQI
19AQI
20AQI
25AQI
27AQI
24AQI
23AQI
21AQI
21AQI
18AQI
17AQI
19AQI
19AQI
18AQI
16AQI
18AQI
24AQI
27AQI
22AQI
19AQI
21AQI
17AQI
16AQI
15AQI
23AQI
34AQI
54AQI
60AQI
51AQI
57AQI
57AQI
49AQI
29AQI
31AQI
34AQI
41AQI
45AQI
37AQI
38AQI
39AQI
31AQI
35AQI
31AQI
26AQI
22AQI
23AQI
27AQI
28AQI
33AQI
31AQI
37AQI
36AQI
29AQI
21AQI
19AQI
18AQI
20AQI
22AQI
22AQI
25AQI
25AQI
24AQI
27AQI
22AQI
21AQI
23AQI
24AQI
20AQI
17AQI
16AQI
17AQI
17AQI
20AQI
22AQI
18AQI
20AQI
22AQI
22AQI
23AQI
22AQI
20AQI
22AQI
24AQI
24AQI
25AQI
31AQI
37AQI
47AQI
49AQI
57AQI
61AQI
60AQI
59AQI
61AQI
55AQI
50AQI
45AQI
61AQI
66AQI
61AQI
32AQI
24AQI
34AQI
23AQI
41AQI
No. of days
202542AQI
Highest AQI recorded in
February66AQI
Lowest AQI recorded in
July23AQI
202425AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
October15AQI
20237AQI
Highest AQI recorded in
December7AQI
Lowest AQI recorded in
November5AQI
202220AQI
Highest AQI recorded in
January20AQI
Lowest AQI recorded in
January20AQI
202122AQI
Highest AQI recorded in
June30AQI
Lowest AQI recorded in
November14AQI
Most & Least Polluted Years Over the Last 5 Years
Schlieren's annual 2025 AQI (42) shows an average percentage change of 199.9% (worsened AQI) compared to previous years: 2021 (22), 2022 (20), 2023 (7), 2024 (25).