Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam 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
Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam
AQI Trends: Highest and Lowest
Same Day Analysis (30th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 50 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Sep - 1st Oct 2025
Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam
5 AM30th Sep 2025
5 PM
4 AM1st Oct 2025
AQI
AQI
70AQI
41AQI
In the last 24 hours,
Hien Nam's AQI reached its highest point of 70 at 1 AM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 30th Sep and 1st Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam
27°C25/29°C
28°C25/32°C
28°C25/33°C
28°C26/33°C
29°C26/33°C
29°C26/34°C
29°C26/34°C
30°C26/36°C
29°C27/33°C
28°C26/32°C
28°C26/32°C
28°C26/31°C
29°C26/33°C
28°C25/32°C
28°C25/31°C
28°C25/32°C
27°C25/31°C
26°C24/28°C
28°C24/32°C
29°C25/33°C
29°C26/34°C
28°C26/31°C
28°C25/33°C
29°C25/33°C
25°C24/25°C
26°C23/30°C
27°C24/32°C
25°C24/29°C
26°C25/27°C
--°C/°C
--°C/°C
49AQI
40AQI
49AQI
44AQI
2025 Days Vs Air Quality
Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam
43%
54
57%
71
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 43%
Health Risk Level:
Significant
In 2025, 43% of 273 days were within WHO’s safe air quality limits, and 57% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.
Annual Air Quality Insights
Hien Nam, Thanh pho Hung Yen, Hung Yen, Vietnam
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
56AQI
61AQI
58AQI
57AQI
58AQI
57AQI
60AQI
61AQI
59AQI
59AQI
59AQI
60AQI
60AQI
61AQI
59AQI
58AQI
60AQI
61AQI
62AQI
61AQI
54AQI
56AQI
54AQI
47AQI
41AQI
49AQI
54AQI
51AQI
51AQI
45AQI
45AQI
43AQI
46AQI
36AQI
34AQI
41AQI
54AQI
53AQI
51AQI
52AQI
51AQI
55AQI
52AQI
54AQI
54AQI
56AQI
59AQI
61AQI
53AQI
55AQI
52AQI
60AQI
54AQI
53AQI
44AQI
42AQI
41AQI
46AQI
51AQI
50AQI
49AQI
57AQI
55AQI
56AQI
53AQI
53AQI
56AQI
56AQI
55AQI
54AQI
53AQI
52AQI
54AQI
55AQI
54AQI
50AQI
50AQI
53AQI
46AQI
42AQI
40AQI
40AQI
42AQI
46AQI
47AQI
47AQI
45AQI
43AQI
37AQI
36AQI
38AQI
46AQI
46AQI
41AQI
40AQI
41AQI
42AQI
40AQI
42AQI
40AQI
40AQI
47AQI
55AQI
47AQI
51AQI
45AQI
41AQI
39AQI
41AQI
42AQI
40AQI
46AQI
54AQI
55AQI
54AQI
55AQI
50AQI
55AQI
56AQI
48AQI
54AQI
54AQI
51AQI
27AQI
50AQI
58AQI
55AQI
51AQI
47AQI
47AQI
No. of days
202550AQI
Highest AQI recorded in
May58AQI
Lowest AQI recorded in
September47AQI
Most & Least Polluted Years Over the Last 1 Years
Hien Nam's annual 2025 AQI (50) shows an average percentage change of NaN% (improved AQI) compared to previous years: .