Nashua, New Hampshire, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Nashua, New Hampshire, United States
AQI Trends: Highest and Lowest
Same Day Analysis (18th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 19 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 18th Oct - 19th Oct 2025
Nashua, New Hampshire, United States
6 AM18th Oct 2025
6 PM
5 AM19th Oct 2025
37AQI
6AQI
47AQI
8AQI
In the last 24 hours,
Nashua's AQI reached its highest point of 47 at 2 AM during the Night, while the lowest point, 6, was recorded at 5 PM during the Day between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Nashua, New Hampshire, United States
20°C15/25°C
14°C8/20°C
13°C4/24°C
15°C4/26°C
19°C13/31°C
18°C16/18°C
19°C16/21°C
21°C17/26°C
19°C13/28°C
22°C16/32°C
19°C12/29°C
18°C12/27°C
13°C7/22°C
11°C4/20°C
14°C4/25°C
18°C8/31°C
20°C10/32°C
20°C12/31°C
21°C14/30°C
18°C11/20°C
10°C5/17°C
8°C0/20°C
11°C3/19°C
11°C7/15°C
11°C10/11°C
12°C9/19°C
13°C7/19°C
9°C6/15°C
11°C5/20°C
10°C3/20°C
--°C/°C
24AQI
18AQI
23AQI
20AQI
2025 Days Vs Air Quality
Nashua, New Hampshire, United States
87%
180
13%
26
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 292 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
Nashua, New Hampshire, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
17AQI
19AQI
20AQI
25AQI
34AQI
18AQI
17AQI
23AQI
21AQI
19AQI
17AQI
15AQI
15AQI
14AQI
21AQI
19AQI
14AQI
14AQI
19AQI
25AQI
10AQI
13AQI
20AQI
46AQI
19AQI
16AQI
32AQI
18AQI
21AQI
44AQI
27AQI
10AQI
16AQI
24AQI
19AQI
17AQI
34AQI
41AQI
32AQI
16AQI
20AQI
24AQI
20AQI
22AQI
13AQI
19AQI
20AQI
25AQI
28AQI
28AQI
35AQI
34AQI
17AQI
12AQI
12AQI
15AQI
15AQI
12AQI
12AQI
13AQI
19AQI
22AQI
25AQI
18AQI
30AQI
19AQI
13AQI
17AQI
22AQI
39AQI
57AQI
58AQI
53AQI
80AQI
76AQI
34AQI
48AQI
69AQI
54AQI
44AQI
37AQI
36AQI
27AQI
22AQI
30AQI
31AQI
51AQI
51AQI
50AQI
54AQI
50AQI
40AQI
26AQI
25AQI
33AQI
30AQI
38AQI
31AQI
42AQI
41AQI
39AQI
53AQI
45AQI
30AQI
26AQI
26AQI
28AQI
31AQI
22AQI
23AQI
29AQI
41AQI
35AQI
17AQI
22AQI
21AQI
28AQI
19AQI
22AQI
30AQI
36AQI
76AQI
83AQI
67AQI
57AQI
47AQI
67AQI
54AQI
31AQI
60AQI
81AQI
97AQI
59AQI
54AQI
37AQI
36AQI
42AQI
53AQI
60AQI
50AQI
34AQI
47AQI
42AQI
55AQI
17AQI
18AQI
17AQI
19AQI
24AQI
34AQI
27AQI
27AQI
17AQI
18AQI
20AQI
23AQI
18AQI
20AQI
29AQI
29AQI
28AQI
25AQI
30AQI
46AQI
37AQI
22AQI
21AQI
22AQI
25AQI
32AQI
34AQI
39AQI
42AQI
31AQI
23AQI
22AQI
24AQI
18AQI
20AQI
19AQI
27AQI
29AQI
18AQI
20AQI
16AQI
27AQI
29AQI
29AQI
14AQI
11AQI
13AQI
20AQI
47AQI
54AQI
42AQI
10AQI
20AQI
14AQI
11AQI
25AQI
13AQI
14AQI
15AQI
19AQI
14AQI
19AQI
23AQI
20AQI
22AQI
42AQI
38AQI
38AQI
27AQI
21AQI
No. of days
202530AQI
Highest AQI recorded in
June42AQI
Lowest AQI recorded in
April20AQI
Most & Least Polluted Years Over the Last 1 Years
Nashua's annual 2025 AQI (30) shows an average percentage change of NaN% (improved AQI) compared to previous years: .