Why is the pollution of Kathmandu the same even when the vehicle is not running?
Smoke from vehicles is considered to be the main cause of pollution in the capital. Due to the three-week ban imposed to control the Corona epidemic, very few vehicles have crashed in the Kathmandu Valley at this time. However, Kathmandu is on the list of 10 most polluted cities in the world. Why did this happen?
According to Switzerland-based Air Visual, an organization that collects and processes air quality data, Kathmandu was ranked sixth out of 100 cities in the world in the list of polluted cities on Monday afternoon. On that day, Kathmandu’s air pollution index (AQI) was 110. In the third year of the ban, Kathmandu is in the 10th position with 87 points at 6 pm on Sunday.
Chile’s Santiago is in the first place with 176 points. At 7:45 a.m. Sunday, Kathmandu’s AQI was 127. In the second week of April, Kathmandu was at the top of the list of the world’s most polluted cities due to fires in different districts of the country and lack of rain for many days. At that time, Kathmandu’s AQI had exceeded 300.
In terms of impact on public health, a condition with an AQI of 0 to 50 is considered healthy and a condition of 51 to 100 is considered moderate. Unnaturally sensitive people at the middle level should not go out for a long time.
Similarly, between 101 and 150 is considered unhealthy for sensitive people.
Experts say that children with this level of pollution and adults with respiratory problems should not stay out of the house for long. When measuring AQI, the level from zero to 500 is divided into 6 levels. When calculating AQI, pollution factors such as PM2.5, PM10, surface weight conditions, carbon monoxide, sulfur dioxide and nitrogen dioxide are measured.
When measuring PM2.5, which is considered a major factor in AQI, Nepal has defined clean air as 40 micrograms of fine particles per cubic meter of air and has adopted the same criteria. The World Health Organization’s guideline states that the average daily PM2.5 level should be 25 micrograms per cubic meter.
In the last 24 hours, an average of 54 micrograms per cubic meter has been observed at Ratna Park in the capital. This is double the number set by the World Health Organization and 14 points higher than Nepal’s national standard.