Country Background

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!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

July Air Quality Analysis

Herstal, Liege, Wallonia, Belgium

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
2nd Jul 2023
54AQI
Lowest AQI recorded on
26th Jul 2021
6AQI


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

Globe

2025 Days Vs Air Quality

Herstal, Liege, Wallonia, Belgium

2025

76%

161

23%

49

0.9%

2

Total number of days with different AQI categories in last 213 days in 2025 (152 days remaining)

Good
161 Days
Moderate
49 Days
Poor
2 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



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

AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

1st January 2025
22AQI
2nd January 2025
33AQI
3rd January 2025
28AQI
4th January 2025
34AQI
5th January 2025
22AQI
6th January 2025
25AQI
7th January 2025
24AQI
8th January 2025
21AQI
9th January 2025
30AQI
10th January 2025
37AQI
11th January 2025
57AQI
12th January 2025
74AQI
13th January 2025
68AQI
14th January 2025
59AQI
15th January 2025
63AQI
16th January 2025
55AQI
17th January 2025
67AQI
18th January 2025
58AQI
19th January 2025
76AQI
20th January 2025
76AQI
21st January 2025
87AQI
22nd January 2025
53AQI
23rd January 2025
43AQI
24th January 2025
21AQI
25th January 2025
27AQI
26th January 2025
26AQI
27th January 2025
27AQI
28th January 2025
27AQI
29th January 2025
23AQI
30th January 2025
21AQI
31st January 2025
44AQI
1st February 2025
55AQI
2nd February 2025
66AQI
3rd February 2025
75AQI
4th February 2025
59AQI
5th February 2025
49AQI
6th February 2025
66AQI
7th February 2025
42AQI
8th February 2025
61AQI
9th February 2025
59AQI
10th February 2025
107AQI
11th February 2025
43AQI
12th February 2025
59AQI
13th February 2025
91AQI
14th February 2025
97AQI
15th February 2025
66AQI
16th February 2025
52AQI
17th February 2025
60AQI
18th February 2025
72AQI
19th February 2025
80AQI
20th February 2025
59AQI
21st February 2025
32AQI
22nd February 2025
27AQI
23rd February 2025
26AQI
24th February 2025
24AQI
25th February 2025
28AQI
26th February 2025
35AQI
27th February 2025
24AQI
28th February 2025
31AQI
1st March 2025
58AQI
2nd March 2025
66AQI
3rd March 2025
58AQI
4th March 2025
72AQI
5th March 2025
65AQI
6th March 2025
56AQI
7th March 2025
49AQI
8th March 2025
65AQI
9th March 2025
80AQI
10th March 2025
88AQI
11th March 2025
89AQI
12th March 2025
43AQI
13th March 2025
53AQI
14th March 2025
36AQI
15th March 2025
52AQI
16th March 2025
58AQI
17th March 2025
47AQI
18th March 2025
25AQI
19th March 2025
38AQI
20th March 2025
42AQI
21st March 2025
57AQI
22nd March 2025
26AQI
23rd March 2025
15AQI
24th March 2025
43AQI
25th March 2025
112AQI
26th March 2025
46AQI
27th March 2025
64AQI
28th March 2025
63AQI
29th March 2025
28AQI
30th March 2025
32AQI
31st March 2025
24AQI
1st April 2025
37AQI
2nd April 2025
33AQI
3rd April 2025
42AQI
4th April 2025
45AQI
5th April 2025
47AQI
6th April 2025
17AQI
7th April 2025
23AQI
8th April 2025
23AQI
9th April 2025
55AQI
10th April 2025
44AQI
11th April 2025
57AQI
12th April 2025
44AQI
13th April 2025
33AQI
14th April 2025
36AQI
15th April 2025
25AQI
16th April 2025
20AQI
17th April 2025
22AQI
18th April 2025
29AQI
19th April 2025
22AQI
20th April 2025
43AQI
21st April 2025
15AQI
22nd April 2025
24AQI
23rd April 2025
20AQI
24th April 2025
36AQI
25th April 2025
59AQI
26th April 2025
65AQI
27th April 2025
31AQI
28th April 2025
37AQI
29th April 2025
42AQI
30th April 2025
38AQI
1st May 2025
35AQI
2nd May 2025
37AQI
3rd May 2025
81AQI
4th May 2025
20AQI
5th May 2025
22AQI
6th May 2025
19AQI
7th May 2025
37AQI
8th May 2025
27AQI
9th May 2025
20AQI
10th May 2025
18AQI
11th May 2025
18AQI
12th May 2025
18AQI
13th May 2025
22AQI
14th May 2025
35AQI
15th May 2025
38AQI
16th May 2025
25AQI
17th May 2025
37AQI
18th May 2025
40AQI
19th May 2025
39AQI
20th May 2025
27AQI
21st May 2025
36AQI
22nd May 2025
28AQI
23rd May 2025
16AQI
24th May 2025
19AQI
25th May 2025
16AQI
26th May 2025
21AQI
27th May 2025
17AQI
28th May 2025
15AQI
29th May 2025
22AQI
30th May 2025
16AQI
31st May 2025
29AQI
1st June 2025
22AQI
2nd June 2025
28AQI
3rd June 2025
30AQI
4th June 2025
24AQI
5th June 2025
16AQI
6th June 2025
14AQI
7th June 2025
14AQI
8th June 2025
15AQI
9th June 2025
25AQI
10th June 2025
46AQI
11th June 2025
33AQI
12th June 2025
37AQI
13th June 2025
43AQI
14th June 2025
41AQI
15th June 2025
33AQI
16th June 2025
27AQI
17th June 2025
30AQI
18th June 2025
35AQI
19th June 2025
37AQI
20th June 2025
30AQI
21st June 2025
29AQI
22nd June 2025
27AQI
23rd June 2025
22AQI
24th June 2025
19AQI
25th June 2025
17AQI
26th June 2025
18AQI
27th June 2025
17AQI
28th June 2025
16AQI
29th June 2025
18AQI
30th June 2025
22AQI
1st July 2025
24AQI
2nd July 2025
30AQI
3rd July 2025
27AQI
4th July 2025
23AQI
5th July 2025
20AQI
6th July 2025
18AQI
7th July 2025
18AQI
8th July 2025
18AQI
9th July 2025
21AQI
10th July 2025
24AQI
11th July 2025
23AQI
12th July 2025
24AQI
13th July 2025
26AQI
14th July 2025
26AQI
15th July 2025
22AQI
16th July 2025
19AQI
17th July 2025
22AQI
18th July 2025
22AQI
19th July 2025
24AQI
20th July 2025
20AQI
21st July 2025
15AQI
22nd July 2025
15AQI
23rd July 2025
14AQI
24th July 2025
30AQI
25th July 2025
35AQI
26th July 2025
38AQI
27th July 2025
30AQI
28th July 2025
24AQI
29th July 2025
23AQI
30th July 2025
28AQI
31st July 2025
22AQI

43AQI

55AQI

53AQI

35AQI

27AQI

26AQI

23AQI


No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202537AQI

19
12
11
16
1
14
16
1
26
4
30
1
30
31
161
49
2

Highest AQI recorded in

February

55AQI


Lowest AQI recorded in

July

23AQI


202429AQI

24
6
1
27
2
26
5
29
1
24
7
26
4
31
29
2
24
6
31
26
4
24
7
321
44
1

Highest AQI recorded in

November

37AQI


Lowest AQI recorded in

April

16AQI


202331AQI

3
26
5
22
8
23
8
18
12
30
1
29
2
27
3
31
28
1
28
3
265
43

Highest AQI recorded in

June

46AQI


Lowest AQI recorded in

November

16AQI


202231AQI

17
14
20
1
5
25
1
27
3
25
6
29
22
1
28
29
2
4
207
51
1

Highest AQI recorded in

March

66AQI


Lowest AQI recorded in

November

7AQI


202137AQI

20
10
20
8
20
11
20
10
30
1
22
8
31
26
3
24
6
29
2
18
12
23
8
283
79

Highest AQI recorded in

April

48AQI


Lowest AQI recorded in

August

25AQI


202035AQI

7
4
2
11
10
17
1
24
6
31
27
4
28
2
28
3
19
11
25
5
217
46
2

Highest AQI recorded in

March

56AQI


Lowest AQI recorded in

July

25AQI


Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2025(Avg.)
37AQI
Least Polluted Year Recorded
2024(Avg.)
29AQI


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).