Kathmandu, Bagmati Province, Nepal 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
Kathmandu, Bagmati Province, Nepal
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 42 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Kathmandu, Bagmati Province, Nepal
5 AM21st Sep 2025
6 PM
4 AM22nd Sep 2025
AQI
AQI
62AQI
17AQI
In the last 24 hours,
Kathmandu's AQI reached its highest point of 62 at 1 AM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Kathmandu, Bagmati Province, Nepal
21°C18/24°C
21°C17/24°C
21°C18/24°C
21°C19/25°C
21°C18/24°C
21°C19/25°C
20°C19/22°C
21°C18/23°C
21°C19/25°C
21°C17/27°C
21°C17/26°C
21°C17/27°C
21°C17/25°C
21°C17/25°C
21°C18/25°C
21°C19/24°C
21°C19/24°C
21°C19/25°C
22°C19/25°C
20°C19/23°C
21°C17/26°C
21°C20/24°C
20°C19/23°C
19°C19/21°C
19°C18/21°C
19°C18/20°C
19°C18/22°C
19°C17/23°C
20°C17/25°C
--°C/°C
--°C/°C
55AQI
49AQI
57AQI
57AQI
2025 Days Vs Air Quality
Kathmandu, Bagmati Province, Nepal
5%
9
61%
108
34%
61
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 5%
Health Risk Level:
Extreme
In 2025, 5% of 264 days were within WHO’s safe air quality limits. The risk of health issues is Extreme, potentially causing respiratory problems, heart disease, skin issues, and stress, especially for children, the elderly, and those with pre-existing conditions.
Annual Air Quality Insights
Kathmandu, Bagmati Province, Nepal
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
122AQI
120AQI
119AQI
115AQI
117AQI
114AQI
114AQI
127AQI
132AQI
131AQI
130AQI
122AQI
128AQI
127AQI
116AQI
99AQI
97AQI
105AQI
101AQI
91AQI
80AQI
86AQI
80AQI
89AQI
88AQI
107AQI
100AQI
103AQI
106AQI
108AQI
110AQI
115AQI
91AQI
82AQI
68AQI
82AQI
107AQI
115AQI
101AQI
104AQI
106AQI
108AQI
107AQI
108AQI
109AQI
107AQI
112AQI
113AQI
120AQI
127AQI
124AQI
116AQI
113AQI
110AQI
104AQI
107AQI
106AQI
100AQI
100AQI
101AQI
94AQI
88AQI
95AQI
90AQI
92AQI
109AQI
111AQI
116AQI
117AQI
109AQI
107AQI
108AQI
115AQI
114AQI
123AQI
121AQI
117AQI
112AQI
112AQI
112AQI
102AQI
95AQI
94AQI
92AQI
91AQI
86AQI
86AQI
87AQI
90AQI
91AQI
88AQI
85AQI
81AQI
82AQI
82AQI
82AQI
80AQI
78AQI
77AQI
78AQI
79AQI
73AQI
71AQI
68AQI
66AQI
68AQI
65AQI
68AQI
71AQI
68AQI
59AQI
50AQI
52AQI
54AQI
57AQI
60AQI
61AQI
57AQI
59AQI
57AQI
57AQI
51AQI
46AQI
44AQI
45AQI
53AQI
59AQI
68AQI
70AQI
66AQI
63AQI
71AQI
73AQI
70AQI
58AQI
56AQI
57AQI
62AQI
62AQI
60AQI
58AQI
56AQI
55AQI
56AQI
55AQI
52AQI
55AQI
55AQI
53AQI
45AQI
50AQI
53AQI
58AQI
54AQI
53AQI
54AQI
57AQI
58AQI
58AQI
57AQI
55AQI
61AQI
58AQI
57AQI
57AQI
65AQI
72AQI
72AQI
66AQI
68AQI
67AQI
66AQI
61AQI
60AQI
53AQI
31AQI
32AQI
42AQI
119AQI
105AQI
106AQI
100AQI
62AQI
58AQI
58AQI
No. of days
202584AQI
Highest AQI recorded in
March119AQI
Lowest AQI recorded in
September58AQI
Most & Least Polluted Years Over the Last 1 Years
Kathmandu's annual 2025 AQI (84) shows an average percentage change of NaN% (improved AQI) compared to previous years: .