Kathmandu, Bagmati, Nepal Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

September Air Quality Analysis
Kathmandu, Bagmati, Nepal

2023

2024

2025

AQI

Days

Days	2025	2024	2023
Sep. 1	57	63	87
Sep. 2	57	64	96
Sep. 3	55	57	85
Sep. 4	52		52
Sep. 5	58		128
Sep. 6	56		82
Sep. 7	57		53
Sep. 8	64		60
Sep. 9	71		52
Sep. 10	72		51
Sep. 11	66		71
Sep. 12	69		77
Sep. 13	66		70
Sep. 14	65		65
Sep. 15	60		66
Sep. 16	59		61
Sep. 17	55		70
Sep. 18			58
Sep. 19			72
Sep. 20			67
Sep. 21			60
Sep. 22			51
Sep. 23			53
Sep. 24			43
Sep. 25			57
Sep. 26			66
Sep. 27			65
Sep. 28			80
Sep. 29			84
Sep. 30			90

AQI Trends: Highest and Lowest

Highest AQI recorded on

5th Sep 2023

128AQI

Lowest AQI recorded on

24th Sep 2023

43AQI

Same Day Analysis (17th September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 2nd highest AQI at 55 of Moderate air quality, showing improvement over 2023 on the same day.

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Kathmandu, Bagmati, Nepal

AQI

Day

Night

5 AM17th Sep 2025

6 PM

4 AM18th Sep 2025

Day time

Avg. Highest Time

11AM17th Sep

64AQI

Avg. Lowest Time

6AM17th Sep

37AQI

Night time

Avg. Highest Time

3AM18th Sep

60AQI

Avg. Lowest Time

11PM17th Sep

28AQI

In the last 24 hours,

Kathmandu's AQI reached its highest point of 64 at 11 AM during the Day, while the lowest point, 28, was recorded at 11 PM during the Night between 17th Sep and 18th Sep 2025.

Day & Night AQI Trend : Aug - Sep 2025
Kathmandu, Bagmati, Nepal

AugSep

19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th

Day

Night

21°C17/25°C

21°C18/25°C

22°C19/25°C

21°C18/25°C

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°C18/25°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

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

10 AM - 1 PM

59AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

5 AM - 6 AM

52AQI

2 hours / Day

60 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 10 AM to 1 PM (Avg. 59), while the lowest AQI was between 5 AM to 6 AM (Avg. 52).

Night time

Avg. Highest Time

8 PM - 11 PM

60AQI

4 hours / Day

120 hours / Month

Avg. Lowest Time

1 AM - 4 AM

56AQI

4 hours / Day

120 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 8 PM to 11 PM (Avg. 60), while the lowest AQI was between 1 AM to 4 AM (Avg. 56).

2025 Days Vs Air Quality
Kathmandu, Bagmati, Nepal

2025

54%

140

43%

113

Total number of days with different AQI categories in last 261 days in 2025 (104 days remaining)

Good

7 Days

Moderate

140 Days

Poor

113 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 3%

Health Risk Level:

Extreme

In 2025, 3% of 261 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, Nepal

AQI levels in 2025

AQI

PM2.5

PM10

SO2

NO2

Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

119AQI

96AQI

97AQI

103AQI

104AQI

100AQI

61AQI

58AQI

61AQI

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202590AQI

140

113

Highest AQI recorded in

January

119AQI

Lowest AQI recorded in

August

58AQI

2024108AQI

109

119

Highest AQI recorded in

April

159AQI

Lowest AQI recorded in

August

52AQI

2023118AQI

120

115

101

Highest AQI recorded in

February

169AQI

Lowest AQI recorded in

August

60AQI

2022143AQI

Highest AQI recorded in

February

155AQI

Lowest AQI recorded in

October

133AQI

2021137AQI

Highest AQI recorded in

November

137AQI

Lowest AQI recorded in

November

137AQI

Most & Least Polluted Years Over the Last 5 Years

Most Polluted Year Recorded

2022(Avg.)

143AQI

Least Polluted Year Recorded

2025(Avg.)

90AQI

Kathmandu's annual 2025 AQI (90) shows an average percentage change of -27.8% (improved AQI) compared to previous years: 2021 (137), 2022 (143), 2023 (118), 2024 (108).


5 AM	55
6 AM	37
7 AM	49
8 AM	54
9 AM	56
10 AM	62
11 AM	64
12 PM	64
1 PM	62
2 PM	64
3 PM	59
4 PM	62
5 PM	64
6 PM	45
7 PM	34
8 PM	43
9 PM	29
10 PM	35
11 PM	28
12 AM	45
1 AM	55
2 AM	58
3 AM	60
4 AM	56

Kathmandu, Bagmati, Nepal Historical Air Quality Analysis

September Air Quality AnalysisKathmandu, Bagmati, Nepal

Day & Night AQI Trend: 17th Sep - 18th Sep 2025Kathmandu, Bagmati, Nepal

Day & Night AQI Trend : Aug - Sep 2025Kathmandu, Bagmati, Nepal

2025 Days Vs Air Quality Kathmandu, Bagmati, Nepal

Annual Air Quality InsightsKathmandu, Bagmati, Nepal

AQI levels in 2025

No. of days

September Air Quality Analysis
Kathmandu, Bagmati, Nepal

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Kathmandu, Bagmati, Nepal

Day & Night AQI Trend : Aug - Sep 2025
Kathmandu, Bagmati, Nepal

2025 Days Vs Air Quality
Kathmandu, Bagmati, Nepal

Annual Air Quality Insights
Kathmandu, Bagmati, Nepal