GUWAHATI, Aug 14: Guwahati Mayor Mrigen Sarania has declared Guwahati as an open defecation-free city. Talking to the media in the city on Monday, Sarania said that the declaration was made after receiving relevant reports from schools, ward members and citizens. “Now on building bye-laws will incorporate clauses for own arrangement for the disposal of garbage by those owning buildings in the city. From September next 56 NGOs will be entrusted to collect garbage,” he said.