Table data below is obtained with permission from His Majesty's Government,
Ministry of Population and Environment.
(updated every Tuesday when data is available)
What type of air is called “polluted”?
Air with maximum quantity of dust particles is called polluted air. When dust particles increase, the air is more polluted. When dust particle decreases, the air is less polluted or good in quality.
What is “PM10”?
PM10 is a measurement unit for dust particles present in the air. In technical terms, PM10 means Particulate Matter with diameter less than or equal to 10 micrometer. Its measurement unit is microgram per cubic meter.
What are the types of air quality?
There are five levels of air quality depending upon the amount of dust. They are as follows:
Air Quality |
Quantity of PM10 (dust) |
| Good |
Below 60 |
| Moderate |
61 to 120 |
| Unhealthy |
121 to 350 |
| Very Unhealthy |
351 to 425 |
| Hazardous |
Above 425 |
Where are the air quality stations?
Air Quality of Kathmandu Valley is recorded at six stations daily, but the data is compiled on a weekly basis. The six stations are Putali Sadak, Matsyagaon, Tribhuvan University, Bhaktapur, Patan Hospital and Thamel.
Ministry of Environment and Population runs the stations under the assistance of Danish agency, Danida.
Capital air quality worsens What is PM10 ?
The pollution level in Kathmandu Valley deteriorated from September 25 to October 01 as compared to the previous week.
According to the data recorded by the Ministry of Environment and Population, the weekly averages of the air pollution levels (based on the daily averages) registered an increase in all monitoring stations except at Putalisadak monitoring station.
The Putalisadak area registered some improvement in the air quality with the pollution level decreasing from 156.42 PM10 to 137.42 PM10 during the period. However the area was the second most polluted station among the six monitoring stations of the valley.
Weekly air quality report : Sep 25 - Oct 01
Date |
Putalisadak |
Matsyagaon |
Kirtipur |
Bhaktapur |
Patan Hospital |
Thamel |
2005/09/25 |
139 |
18 |
19 |
37 |
102 |
63 |
2005/09/26 |
130 |
18 |
14 |
35 |
176 |
56 |
2005/09/27 |
108 |
23 |
20 |
43 |
245 |
50 |
2005/09/28 |
140 |
32 |
26 |
53 |
152 |
78 |
2005/09/29 |
145 |
31 |
28 |
49 |
221 |
71 |
2005/09/30 |
157 |
28 |
32 |
52 |
137 |
72 |
2005/10/01 |
143 |
39 |
35 |
67 |
134 |
87 |
 |
137.42 |
27.00 |
24.85 |
48.00 |
166.71 |
68.14 |
( * The Kathmandu Valley Weekly Average data is compiled by Nepalnews. Other data obtained from the Ministry of Population and Environment).
The Patan Hospital area monitoring station was the most polluted site recording a weekly average of 166.71 PM10, up from the previous period's 117.00PM10. The area recorded "unhealthy" and "moderate" air marks for six and one day of the period.
Thamel, and Bhaktapur area were respectively the third and fourth most polluted sites in the Valley during the period recording a weekly average of 68.14PM10 and 48.00PM10 up from 67.14PM10 and 42.14PM10 respectively.
Matsyagaon and Kirtipur area recorded a weekly average of 27.00 PM10 and 24.85 PM10 respectively up from 18,14PM10 and 20.28.
The overall outdoor air quality of Kathmandu valley on Tuesday (October 04) was 'moderate’ recording 72 µgm/m3. nepalnews.com pb Oct 05 05
Capital air quality improves What is PM10 ?
The air quality in Kathmandu Valley improved from September 18 to 24 as compared to the previous week.
According to the data recorded by the Ministry of Environment and Population, the weekly averages of the air pollution levels (based on the daily averages) registered a decrease in all monitoring stations except Matsyagaon as compared to the previous week.
The Matsyagaon monitoring station recorded slight increase in the pollution level, as six day’s data of the monitoring station were not available last week.
Weekly air quality report : Sep 18 - 24
Date |
Putalisadak |
Matsyagaon |
Kirtipur |
Bhaktapur |
Patan Hospital |
Thamel |
2005/09/18 |
167 |
20 |
26 |
53 |
136 |
86 |
2005/09/19 |
172 |
25 |
28 |
58 |
150 |
83 |
2005/09/20 |
190 |
30 |
26 |
40 |
146 |
74 |
2005/09/21 |
98 |
12 |
11 |
20 |
115 |
47 |
2005/09/22 |
128 |
14 |
18 |
33 |
89 |
54 |
2005/09/23 |
184 |
10 |
13 |
38 |
88 |
60 |
2005/09/24 |
156 |
16 |
20 |
53 |
95 |
66 |
|
156.42 |
18.14 |
20.28 |
42.14 |
117.00 |
67.14 |
( * The Kathmandu Valley Weekly Average data is compiled by Nepalnews. Other data obtained from the Ministry of Population and Environment).
Like the previous week, the Putalisadak area monitoring station was the most polluted site recording a weekly average of 156.42 PM10, down from the previous period's 167.28.85PM10. The area recorded "unhealthy" and "moderate" air marks for six and one day of the period.
The Patan Hospital, Thamel, and Bhaktapur area were respectively the second, third and fourth polluted sites in the Valley during the period recording a weekly average of 117.00, 67.14 and 42.14 PM10 down from 162.28, 85.71 and 36.71 PM10 respectively.
Kirtipur area and Matsyagaon area recorded a weekly average of 20.28 and 18.14 PM10 from 36.71 and 15.00 PM10.
The overall outdoor air quality of Kathmandu valley on Wednesday (September 28) was 'good’ recording 50 µgm/m3. nepalnews.com pb Sep 28 05
Capital air quality worsens What is PM10 ?
The pollution level in Kathmandu Valley deteriorated from September 11 to 17
as compared to the previous week.
According to the data recorded by the Ministry of Environment and
Population, the weekly averages of the air pollution levels (based on the
daily averages) registered an increase in all monitoring stations at
Matsyagaon, Kirtipur (Tribhuvan University area) Bhaktapur, Patan Hospital
and Thamel area.
The Putalisadak area monitoring station was the most polluted site recording
a weekly average of 167.28 PM10, up from the previous period's 127.85PM10.
The area recorded "unhealthy" and "moderate" air marks for six and one day
of the period.
Weekly air quality report : Sep 11 - 17
Date |
Putalisadak |
Matsyagaon |
Kirtipur |
Bhaktapur |
Patan Hospital |
Thamel |
2005/09/11 |
149 |
15 |
17 |
30 |
119 |
52 |
2005/09/12 |
159 |
N/A |
25 |
43 |
160 |
64 |
2005/09/13 |
93 |
N/A |
42 |
48 |
223 |
77 |
2005/09/14 |
164 |
N/A |
54 |
69 |
150 |
79 |
2005/09/15 |
165 |
N/A |
41 |
149 |
182 |
102 |
2005/09/16 |
249 |
N/A |
40 |
64 |
148 |
122 |
2005/09/17 |
192 |
N/A |
38 |
N/A |
154 |
104 |
|
167.28 |
15.00 |
36.71 |
67.16 |
162.28 |
85.71 |
( * The Kathmandu Valley Weekly Average data is compiled by Nepalnews. Other data obtained from the Ministry of Population and Environment). The Patan Hospital, Thamel, and Bhaktapur area were respectively the second,
third and fourth most polluted sites in the Valley during the period
recording a weekly average of 162.28, 85.71 and 67.16 PM10 up from 107.33,
55.71 and 30.16 PM10 respectively.
Kirtipur area and Matsyagaon area recorded a weekly average of 36.71 and 15
PM10 up from 13.28 and 14.28 PM10.
Six day's data of Matsyagaon monitoring stations and one day's data of
Bhaktapur area were not available during the period.
The overall outdoor air quality of Kathmandu valley on Wednesday (September 21) was 'good’ recording 82 µgm/m3.
Weekly air quality report : Sep 04 -10
Date |
Putalisadak |
Matsyagaon |
Kirtipur |
Bhaktapur |
Patan Hospital |
Thamel |
2005/09/04 |
125 |
22 |
20 |
N/A |
100 |
79 |
2005/09/05 |
93 |
18 |
11 |
29 |
N/A |
45 |
2005/09/06 |
110 |
11 |
13 |
23 |
N/A |
36 |
2005/09/07 |
172 |
13 |
15 |
40 |
N/A |
68 |
2005/09/08 |
184 |
13 |
10 |
34 |
N/A |
69 |
2005/09/09 |
99 |
12 |
12 |
23 |
120 |
41 |
2005/09/10 |
112 |
10 |
12 |
32 |
102 |
52 |
|
127.85 |
14.28 |
13.28 |
30.16 |
107.33 |
55.71 |
( * The Kathmandu Valley Weekly Average data is compiled by Nepalnews. Other data obtained from the Ministry of Population and Environment).
August 2005 Mope
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