The Moscow Times
reported that the black snow was first noticed on Wednesday, followed by further black snow on Thursday. Although residents of Omsk were told the abnormally coloured snow presented no health threat, concerned residents made calls to the Federal Inspection Service for Natural Resources, Rosprirodnadzor.
A spokesperson for Rospriodnadzor said "Calls about the strange snow keep on coming, indeed, from the districtâ€™s residents. A laboratory is underway to the site to take samples" the Moscow News
Local prosecutors have now announced they are checking two local businesses, coal producer Omsktekhuglerod and Thermal Power Station No. 5, to determine if they have played a part in changing the colour of the snow.
The environmental impact of the oil and gas industries located in Siberia have been linked to previous reports
of black snow in the region.