Herstal, Liege, Wallonia, Belgium 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
Herstal, Liege, Wallonia, Belgium
AQI Trends: Highest and Lowest
Same Day Analysis (31st July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 22 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

2025 Days Vs Air Quality
Herstal, Liege, Wallonia, Belgium
76%
161
23%
49
0.9%
2
Total number of days with different AQI categories in last 213 days in 2025 (152 days remaining)
Under WHO’s Safe Air Quality Limits: 76%
Health Risk Level:
Low
In 2025, 76% of 213 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
Herstal, Liege, Wallonia, Belgium
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI
33AQI
28AQI
34AQI
22AQI
25AQI
24AQI
21AQI
30AQI
37AQI
57AQI
74AQI
68AQI
59AQI
63AQI
55AQI
67AQI
58AQI
76AQI
76AQI
87AQI
53AQI
43AQI
21AQI
27AQI
26AQI
27AQI
27AQI
23AQI
21AQI
44AQI
55AQI
66AQI
75AQI
59AQI
49AQI
66AQI
42AQI
61AQI
59AQI
107AQI
43AQI
59AQI
91AQI
97AQI
66AQI
52AQI
60AQI
72AQI
80AQI
59AQI
32AQI
27AQI
26AQI
24AQI
28AQI
35AQI
24AQI
31AQI
58AQI
66AQI
58AQI
72AQI
65AQI
56AQI
49AQI
65AQI
80AQI
88AQI
89AQI
43AQI
53AQI
36AQI
52AQI
58AQI
47AQI
25AQI
38AQI
42AQI
57AQI
26AQI
15AQI
43AQI
112AQI
46AQI
64AQI
63AQI
28AQI
32AQI
24AQI
37AQI
33AQI
42AQI
45AQI
47AQI
17AQI
23AQI
23AQI
55AQI
44AQI
57AQI
44AQI
33AQI
36AQI
25AQI
20AQI
22AQI
29AQI
22AQI
43AQI
15AQI
24AQI
20AQI
36AQI
59AQI
65AQI
31AQI
37AQI
42AQI
38AQI
35AQI
37AQI
81AQI
20AQI
22AQI
19AQI
37AQI
27AQI
20AQI
18AQI
18AQI
18AQI
22AQI
35AQI
38AQI
25AQI
37AQI
40AQI
39AQI
27AQI
36AQI
28AQI
16AQI
19AQI
16AQI
21AQI
17AQI
15AQI
22AQI
16AQI
29AQI
22AQI
28AQI
30AQI
24AQI
16AQI
14AQI
14AQI
15AQI
25AQI
46AQI
33AQI
37AQI
43AQI
41AQI
33AQI
27AQI
30AQI
35AQI
37AQI
30AQI
29AQI
27AQI
22AQI
19AQI
17AQI
18AQI
17AQI
16AQI
18AQI
22AQI
24AQI
30AQI
27AQI
23AQI
20AQI
18AQI
18AQI
18AQI
21AQI
24AQI
23AQI
24AQI
26AQI
26AQI
22AQI
19AQI
22AQI
22AQI
24AQI
20AQI
15AQI
15AQI
14AQI
30AQI
35AQI
38AQI
30AQI
24AQI
23AQI
28AQI
22AQI
43AQI
55AQI
53AQI
35AQI
27AQI
26AQI
23AQI
No. of days
202537AQI
Highest AQI recorded in
February55AQI
Lowest AQI recorded in
July23AQI
202429AQI
Highest AQI recorded in
November37AQI
Lowest AQI recorded in
April16AQI
202331AQI
Highest AQI recorded in
June46AQI
Lowest AQI recorded in
November16AQI
202231AQI
Highest AQI recorded in
March66AQI
Lowest AQI recorded in
November7AQI
202137AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August25AQI
202035AQI
Highest AQI recorded in
March56AQI
Lowest AQI recorded in
July25AQI
Most & Least Polluted Years Over the Last 6 Years
Herstal's annual 2025 AQI (37) shows an average percentage change of 16.4% (worsened AQI) compared to previous years: 2020 (35), 2021 (37), 2022 (31), 2023 (31), 2024 (29).