Hamilton, Waikato, New Zealand 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
Hamilton, Waikato, New Zealand
AQI Trends: Highest and Lowest
Same Day Analysis (23rd September ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 24 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 23rd Sep - 24th Sep 2025
Hamilton, Waikato, New Zealand
6 AM23rd Sep 2025
6 PM
5 AM24th Sep 2025
31AQI
26AQI
31AQI
26AQI
In the last 24 hours,
Hamilton's AQI reached its highest point of 31 at 1 PM during the Day, while the lowest point, 26, was recorded at 3 AM during the Night between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hamilton, Waikato, New Zealand
9°C5/14°C
10°C6/15°C
10°C5/17°C
11°C5/16°C
11°C9/14°C
11°C8/15°C
11°C9/13°C
12°C10/15°C
11°C8/15°C
9°C5/15°C
10°C4/15°C
11°C6/17°C
10°C7/12°C
10°C6/14°C
8°C2/14°C
7°C1/13°C
12°C7/16°C
10°C7/14°C
9°C7/13°C
11°C9/14°C
12°C9/15°C
11°C7/16°C
13°C10/17°C
13°C11/17°C
13°C9/15°C
10°C4/15°C
8°C2/15°C
10°C5/15°C
13°C12/16°C
13°C11/15°C
--°C/°C
32AQI
30AQI
32AQI
30AQI
2025 Days Vs Air Quality
Hamilton, Waikato, New Zealand
99%
263
1%
3
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 99%
Health Risk Level:
Very Low
In 2025, 99% of 267 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
Hamilton, Waikato, New Zealand
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
41AQI
35AQI
40AQI
35AQI
32AQI
29AQI
25AQI
23AQI
22AQI
23AQI
21AQI
21AQI
23AQI
21AQI
22AQI
20AQI
24AQI
21AQI
21AQI
20AQI
21AQI
20AQI
22AQI
21AQI
23AQI
21AQI
27AQI
25AQI
27AQI
23AQI
24AQI
23AQI
22AQI
27AQI
28AQI
28AQI
26AQI
26AQI
27AQI
24AQI
26AQI
24AQI
22AQI
23AQI
23AQI
23AQI
23AQI
24AQI
26AQI
23AQI
27AQI
22AQI
24AQI
21AQI
23AQI
21AQI
21AQI
21AQI
21AQI
22AQI
21AQI
22AQI
21AQI
29AQI
27AQI
27AQI
26AQI
24AQI
21AQI
22AQI
23AQI
23AQI
25AQI
23AQI
23AQI
21AQI
24AQI
24AQI
22AQI
22AQI
21AQI
21AQI
21AQI
24AQI
23AQI
22AQI
22AQI
22AQI
22AQI
25AQI
24AQI
24AQI
23AQI
22AQI
22AQI
21AQI
24AQI
23AQI
24AQI
27AQI
23AQI
25AQI
24AQI
26AQI
24AQI
22AQI
23AQI
22AQI
25AQI
23AQI
18AQI
18AQI
19AQI
24AQI
23AQI
24AQI
22AQI
22AQI
23AQI
20AQI
20AQI
20AQI
21AQI
21AQI
28AQI
32AQI
33AQI
32AQI
28AQI
28AQI
31AQI
31AQI
33AQI
31AQI
30AQI
31AQI
25AQI
22AQI
24AQI
24AQI
30AQI
33AQI
35AQI
32AQI
32AQI
23AQI
29AQI
24AQI
29AQI
26AQI
27AQI
28AQI
29AQI
26AQI
25AQI
26AQI
23AQI
21AQI
25AQI
30AQI
35AQI
35AQI
34AQI
35AQI
40AQI
44AQI
39AQI
46AQI
47AQI
41AQI
39AQI
41AQI
50AQI
49AQI
52AQI
52AQI
51AQI
45AQI
45AQI
46AQI
45AQI
49AQI
49AQI
38AQI
43AQI
40AQI
38AQI
42AQI
41AQI
39AQI
35AQI
33AQI
35AQI
33AQI
34AQI
32AQI
35AQI
32AQI
34AQI
39AQI
38AQI
39AQI
37AQI
37AQI
38AQI
38AQI
36AQI
33AQI
33AQI
32AQI
31AQI
32AQI
22AQI
28AQI
28AQI
30AQI
27AQI
31AQI
30AQI
29AQI
29AQI
30AQI
26AQI
24AQI
28AQI
31AQI
24AQI
29AQI
25AQI
23AQI
22AQI
22AQI
20AQI
20AQI
24AQI
25AQI
30AQI
26AQI
25AQI
21AQI
19AQI
23AQI
24AQI
22AQI
21AQI
21AQI
23AQI
28AQI
24AQI
24AQI
24AQI
24AQI
26AQI
25AQI
22AQI
23AQI
23AQI
24AQI
24AQI
22AQI
35AQI
30AQI
29AQI
27AQI
26AQI
24AQI
25AQI
24AQI
23AQI
23AQI
28AQI
38AQI
37AQI
26AQI
25AQI
No. of days
202528AQI
Highest AQI recorded in
June38AQI
Lowest AQI recorded in
April23AQI
202424AQI
Highest AQI recorded in
June56AQI
Lowest AQI recorded in
March10AQI
202318AQI
Highest AQI recorded in
July25AQI
Lowest AQI recorded in
January8AQI
202211AQI
Highest AQI recorded in
August17AQI
Lowest AQI recorded in
December9AQI
20219AQI
Highest AQI recorded in
July9AQI
Lowest AQI recorded in
July9AQI
Most & Least Polluted Years Over the Last 5 Years
Hamilton's annual 2025 AQI (28) shows an average percentage change of 106.9% (worsened AQI) compared to previous years: 2021 (9), 2022 (11), 2023 (18), 2024 (24).