Port Sound, Klang, Selangor, Malaysia 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
Port Sound, Klang, Selangor, Malaysia
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 64 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Port Sound, Klang, Selangor, Malaysia
7 AM21st Sep 2025
7 PM
6 AM22nd Sep 2025
AQI
AQI
100AQI
60AQI
In the last 24 hours,
Port Sound's AQI reached its highest point of 100 at 9 AM during the Night, while the lowest point, undefined, was recorded at 6 AM during the Night between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Port Sound, Klang, Selangor, Malaysia
28°C24/33°C
27°C24/31°C
28°C25/33°C
29°C25/34°C
29°C26/34°C
24°C22/26°C
27°C23/31°C
27°C24/32°C
28°C25/33°C
28°C25/32°C
26°C24/29°C
27°C25/30°C
27°C24/29°C
27°C24/32°C
27°C24/31°C
27°C24/31°C
26°C24/30°C
27°C24/31°C
27°C24/33°C
26°C24/30°C
25°C23/28°C
25°C24/27°C
26°C23/32°C
27°C24/31°C
26°C24/28°C
25°C24/28°C
27°C24/32°C
27°C24/32°C
27°C24/31°C
--°C/°C
--°C/°C
60AQI
52AQI
63AQI
57AQI
2025 Days Vs Air Quality
Port Sound, Klang, Selangor, Malaysia
27%
72
73%
191
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 27%
Health Risk Level:
Very high
In 2025, 27% of 264 days were within WHO’s safe air quality limits. The risk of health issues is Very high, including respiratory issues, heart disease, and stress, particularly affecting vulnerable groups.
Annual Air Quality Insights
Port Sound, Klang, Selangor, Malaysia
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
64AQI
64AQI
61AQI
61AQI
61AQI
63AQI
61AQI
61AQI
61AQI
59AQI
59AQI
59AQI
61AQI
62AQI
61AQI
61AQI
60AQI
60AQI
59AQI
59AQI
61AQI
61AQI
62AQI
63AQI
62AQI
63AQI
62AQI
61AQI
60AQI
60AQI
62AQI
61AQI
63AQI
63AQI
67AQI
68AQI
68AQI
70AQI
69AQI
69AQI
67AQI
69AQI
69AQI
70AQI
69AQI
68AQI
68AQI
69AQI
68AQI
68AQI
68AQI
66AQI
65AQI
65AQI
65AQI
64AQI
62AQI
61AQI
60AQI
60AQI
59AQI
60AQI
59AQI
58AQI
57AQI
57AQI
57AQI
56AQI
56AQI
55AQI
55AQI
55AQI
54AQI
54AQI
53AQI
52AQI
52AQI
53AQI
53AQI
56AQI
55AQI
56AQI
56AQI
56AQI
57AQI
56AQI
56AQI
57AQI
58AQI
57AQI
57AQI
56AQI
56AQI
55AQI
55AQI
54AQI
54AQI
54AQI
53AQI
53AQI
53AQI
52AQI
52AQI
52AQI
51AQI
51AQI
51AQI
51AQI
52AQI
52AQI
52AQI
52AQI
51AQI
51AQI
50AQI
50AQI
50AQI
50AQI
51AQI
50AQI
51AQI
49AQI
48AQI
48AQI
49AQI
50AQI
50AQI
52AQI
51AQI
52AQI
51AQI
50AQI
50AQI
51AQI
50AQI
51AQI
53AQI
52AQI
50AQI
50AQI
49AQI
48AQI
47AQI
47AQI
45AQI
42AQI
41AQI
42AQI
43AQI
46AQI
49AQI
49AQI
50AQI
51AQI
50AQI
49AQI
49AQI
47AQI
43AQI
43AQI
42AQI
43AQI
44AQI
44AQI
45AQI
45AQI
45AQI
43AQI
42AQI
40AQI
39AQI
38AQI
37AQI
38AQI
37AQI
38AQI
40AQI
40AQI
43AQI
44AQI
45AQI
46AQI
43AQI
46AQI
46AQI
47AQI
47AQI
49AQI
50AQI
49AQI
50AQI
51AQI
51AQI
51AQI
52AQI
52AQI
53AQI
54AQI
53AQI
53AQI
53AQI
53AQI
52AQI
52AQI
52AQI
52AQI
53AQI
53AQI
53AQI
55AQI
55AQI
56AQI
56AQI
56AQI
56AQI
54AQI
56AQI
61AQI
62AQI
67AQI
71AQI
62AQI
58AQI
58AQI
60AQI
63AQI
56AQI
60AQI
59AQI
60AQI
61AQI
66AQI
64AQI
69AQI
64AQI
61AQI
61AQI
60AQI
68AQI
59AQI
63AQI
62AQI
60AQI
58AQI
53AQI
59AQI
45AQI
59AQI
55AQI
49AQI
55AQI
49AQI
59AQI
58AQI
51AQI
56AQI
58AQI
48AQI
43AQI
49AQI
51AQI
55AQI
64AQI
61AQI
66AQI
56AQI
52AQI
49AQI
43AQI
51AQI
61AQI
54AQI
No. of days
202555AQI
Highest AQI recorded in
February66AQI
Lowest AQI recorded in
June43AQI
202423AQI
Highest AQI recorded in
June57AQI
Lowest AQI recorded in
September0AQI
20230AQI
Highest AQI recorded in
February0AQI
Lowest AQI recorded in
December0AQI
20220AQI
Highest AQI recorded in
January0AQI
Lowest AQI recorded in
November0AQI
202126AQI
Highest AQI recorded in
February71AQI
Lowest AQI recorded in
December0AQI
202063AQI
Highest AQI recorded in
August68AQI
Lowest AQI recorded in
April59AQI
Most & Least Polluted Years Over the Last 6 Years
Port Sound's annual 2025 AQI (55) shows an average percentage change of 86.6% (worsened AQI) compared to previous years: 2020 (63), 2021 (26), 2022 (0), 2023 (0), 2024 (23).