Heer, Maastricht, Limburg, Netherlands Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Heer, Maastricht, Limburg, Netherlands
AQI Trends: Highest and Lowest
Same Day Analysis (18th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 18 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Sep - 19th Sep 2025
Heer, Maastricht, Limburg, Netherlands
6 AM18th Sep 2025
8 PM
5 AM19th Sep 2025
20AQI
17AQI
25AQI
17AQI
In the last 24 hours,
Heer's AQI reached its highest point of 25 at 5 AM during the Night, while the lowest point, 17, was recorded at 1 AM during the Night between 18th Sep and 19th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Heer, Maastricht, Limburg, Netherlands
19°C12/26°C
18°C11/26°C
14°C9/20°C
14°C9/21°C
15°C8/23°C
17°C9/26°C
21°C13/30°C
20°C15/27°C
19°C13/25°C
16°C12/24°C
17°C12/22°C
19°C15/24°C
18°C14/24°C
17°C13/23°C
20°C17/24°C
18°C13/24°C
16°C11/22°C
17°C11/24°C
21°C13/29°C
20°C16/26°C
14°C11/16°C
16°C11/22°C
16°C12/19°C
14°C11/19°C
14°C12/18°C
15°C9/20°C
17°C14/21°C
15°C12/19°C
14°C10/19°C
18°C13/25°C
--°C/°C
23AQI
20AQI
22AQI
20AQI
2025 Days Vs Air Quality
Heer, Maastricht, Limburg, Netherlands
98%
111
2%
2
Total number of days with different AQI categories in last 262 days in 2025 (103 days remaining)
Under WHO’s Safe Air Quality Limits: 98%
Health Risk Level:
Very Low
In 2025, 98% of 262 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Heer, Maastricht, Limburg, Netherlands
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
21AQI
19AQI
34AQI
26AQI
30AQI
29AQI
28AQI
19AQI
16AQI
15AQI
17AQI
24AQI
44AQI
36AQI
36AQI
45AQI
49AQI
42AQI
37AQI
35AQI
36AQI
37AQI
33AQI
30AQI
28AQI
25AQI
23AQI
21AQI
23AQI
21AQI
18AQI
19AQI
22AQI
26AQI
38AQI
33AQI
27AQI
26AQI
21AQI
21AQI
20AQI
23AQI
25AQI
23AQI
24AQI
26AQI
28AQI
26AQI
25AQI
24AQI
26AQI
29AQI
28AQI
21AQI
18AQI
17AQI
22AQI
29AQI
31AQI
33AQI
29AQI
27AQI
29AQI
24AQI
22AQI
20AQI
20AQI
22AQI
22AQI
24AQI
25AQI
27AQI
35AQI
32AQI
40AQI
44AQI
53AQI
57AQI
50AQI
49AQI
39AQI
27AQI
28AQI
32AQI
31AQI
23AQI
22AQI
21AQI
22AQI
27AQI
30AQI
34AQI
24AQI
19AQI
18AQI
18AQI
18AQI
17AQI
16AQI
19AQI
19AQI
21AQI
23AQI
22AQI
23AQI
20AQI
18AQI
17AQI
16AQI
16AQI
19AQI
19AQI
18AQI
25AQI
29AQI
26AQI
30AQI
19AQI
No. of days
202527AQI
Highest AQI recorded in
August30AQI
Lowest AQI recorded in
September19AQI
Most & Least Polluted Years Over the Last 1 Years
Heer's annual 2025 AQI (27) shows an average percentage change of NaN% (improved AQI) compared to previous years: .