Aosta, Valle D Aosta, Italy 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
Aosta, Valle D Aosta, Italy
AQI Trends: Highest and Lowest
Same Day Analysis (23rd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 22 of Good air quality, showing improvement over 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 23rd Sep - 24th Sep 2025
Aosta, Valle D Aosta, Italy
7 AM23rd Sep 2025
7 PM
6 AM24th Sep 2025
27AQI
18AQI
26AQI
19AQI
In the last 24 hours,
Aosta's AQI reached its highest point of 27 at 1 PM during the Day, while the lowest point, 18, was recorded at 11 AM during the Day between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Aosta, Valle D Aosta, Italy
8°C1/16°C
9°C1/18°C
10°C4/16°C
10°C5/13°C
7°C0/12°C
4°C-1/10°C
8°C0/17°C
7°C2/10°C
5°C-1/11°C
7°C-1/17°C
9°C1/15°C
5°C0/11°C
8°C0/17°C
9°C1/19°C
8°C3/13°C
9°C4/13°C
6°C0/11°C
4°C-2/12°C
5°C-2/13°C
4°C-1/12°C
7°C1/13°C
8°C2/16°C
7°C1/13°C
7°C0/16°C
11°C4/20°C
11°C5/21°C
10°C4/18°C
9°C5/13°C
8°C6/10°C
6°C3/7°C
--°C/°C
29AQI
27AQI
28AQI
26AQI
2025 Days Vs Air Quality
Aosta, Valle D Aosta, Italy
79%
210
21%
56
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 79%
Health Risk Level:
Low
In 2025, 79% of 267 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
Aosta, Valle D Aosta, Italy
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
90AQI
95AQI
79AQI
68AQI
81AQI
74AQI
68AQI
63AQI
61AQI
56AQI
50AQI
58AQI
53AQI
61AQI
65AQI
63AQI
58AQI
67AQI
56AQI
58AQI
51AQI
49AQI
60AQI
65AQI
60AQI
59AQI
59AQI
58AQI
57AQI
50AQI
55AQI
36AQI
39AQI
41AQI
58AQI
74AQI
71AQI
70AQI
68AQI
59AQI
56AQI
54AQI
55AQI
55AQI
43AQI
44AQI
44AQI
43AQI
46AQI
48AQI
49AQI
49AQI
47AQI
41AQI
48AQI
28AQI
23AQI
22AQI
31AQI
29AQI
27AQI
27AQI
28AQI
43AQI
38AQI
43AQI
45AQI
40AQI
38AQI
45AQI
26AQI
29AQI
28AQI
24AQI
26AQI
29AQI
30AQI
41AQI
50AQI
55AQI
37AQI
32AQI
34AQI
39AQI
47AQI
48AQI
50AQI
56AQI
47AQI
43AQI
30AQI
36AQI
39AQI
45AQI
47AQI
42AQI
33AQI
34AQI
34AQI
38AQI
40AQI
40AQI
33AQI
33AQI
29AQI
20AQI
18AQI
20AQI
20AQI
29AQI
29AQI
31AQI
34AQI
25AQI
27AQI
27AQI
28AQI
28AQI
30AQI
39AQI
36AQI
37AQI
42AQI
34AQI
29AQI
23AQI
28AQI
31AQI
29AQI
28AQI
31AQI
24AQI
22AQI
25AQI
24AQI
25AQI
27AQI
27AQI
31AQI
27AQI
23AQI
22AQI
23AQI
31AQI
26AQI
27AQI
30AQI
32AQI
29AQI
26AQI
27AQI
26AQI
28AQI
28AQI
29AQI
28AQI
27AQI
32AQI
41AQI
61AQI
59AQI
58AQI
58AQI
60AQI
62AQI
59AQI
56AQI
44AQI
40AQI
42AQI
46AQI
46AQI
51AQI
47AQI
45AQI
46AQI
47AQI
43AQI
41AQI
40AQI
43AQI
40AQI
38AQI
40AQI
39AQI
40AQI
43AQI
40AQI
31AQI
27AQI
28AQI
30AQI
31AQI
35AQI
33AQI
36AQI
37AQI
39AQI
36AQI
36AQI
38AQI
33AQI
29AQI
27AQI
27AQI
23AQI
23AQI
26AQI
24AQI
22AQI
24AQI
29AQI
31AQI
31AQI
27AQI
26AQI
28AQI
33AQI
30AQI
37AQI
44AQI
49AQI
52AQI
53AQI
54AQI
55AQI
53AQI
53AQI
53AQI
50AQI
49AQI
48AQI
38AQI
34AQI
30AQI
33AQI
30AQI
31AQI
37AQI
36AQI
29AQI
21AQI
20AQI
21AQI
25AQI
26AQI
35AQI
30AQI
29AQI
29AQI
34AQI
33AQI
30AQI
28AQI
24AQI
24AQI
23AQI
24AQI
28AQI
29AQI
31AQI
26AQI
27AQI
32AQI
23AQI
22AQI
63AQI
48AQI
38AQI
32AQI
28AQI
44AQI
32AQI
39AQI
28AQI
No. of days
202539AQI
Highest AQI recorded in
January63AQI
Lowest AQI recorded in
September28AQI
202451AQI
Highest AQI recorded in
January96AQI
Lowest AQI recorded in
July28AQI
202353AQI
Highest AQI recorded in
December80AQI
Lowest AQI recorded in
May41AQI
202257AQI
Highest AQI recorded in
March75AQI
Lowest AQI recorded in
January32AQI
202134AQI
Highest AQI recorded in
December42AQI
Lowest AQI recorded in
May16AQI
202031AQI
Highest AQI recorded in
May52AQI
Lowest AQI recorded in
December18AQI
Most & Least Polluted Years Over the Last 6 Years
Aosta's annual 2025 AQI (39) shows an average percentage change of -7.6% (improved AQI) compared to previous years: 2020 (31), 2021 (34), 2022 (57), 2023 (53), 2024 (51).