We have had rain almost on every alternate day in Kathmandu Valley since last one month. Interestingly, last night rain water is turbid. Most of the vegetation leaves are covered with kind of clay that may contain in rain water. Couple of vegetation pictures from my garden are attached herein too. Everywhere in KTM valley after rain is in same observation!
Expecting your opinion in this regards.
Best!
It is helpful to analyze the back trajectories of air flow to determine the source region of a polluted air mass. According to meteorological data, the air in Katmandu is arriving from Rajasthan; for more information please consult the following site
http://myrepublica.nagariknetwork.com/news/when-rooftops-leaves-and-cars-drenched-in-murky-rain/?categoryId=37
The next step is to find satellite images and perform additional chemical analysis of the material deposited on the leaves as suggested in the first answer.
I suspect that the material is mainly from the dust storms.
any sand storms or vulcanic activity that could explain it?
The most likely source of the observed deposits is shown in the following (historical) satellite image from ESA
https://www.esa.int/Our_Activities/Observing_the_Earth/Earth_from_Space_Sandstorm_in_Rajasthan_India
The actual event mentioned in the question is due to the dust storm in Rajasthan on June 13, 2018:
http://www.tribuneindia.com/news/nation/high-pollution-levels-in-delhi-due-to-dust-storms-from-rajasthan/604689.html
I guess from chemical companies; like cement companies that send dust from the chimney of the plant. The wind could also have played an important role for the direction of the dust.
I agree with all of your comments! Actually, it should be noticed for first rain until few minutes that could wash out all dust particles. Over the time it should have been diminished. Last rain -- after 2/3 hr-- should have been cleared all those deposited on vegetations' leaf, right?
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