Residents in Perm have reported a foul stench emanating from the drainage system for the second time in quick succession.
People complained about the same problem on Wednesday, July 10, and the mysterious odor seems to have made an unwelcome return, Interfax reported.
"Preliminary analysis shows that the smell is coming from the same source as last Wednesday," city officials said, adding that the district's residents' lives were not at risk.
Last Wednesday, the city's authorities received an inundation of complaints from people all over the city claiming to have been made nauseous and dizzy by the rank smell.
Some bloggers even talked about leaving the city until the smell went away.
One source of the noxious fumes may be substances being dumped into a manhole at the junction between Slavyanov and Smirnov Ulitsa. The substances would then have been carried throughout the drainage system.
The same source said that the substances could not get into people's homes.