Pakistan is among the 10 countries where most urban dwellers lack access to safe and private toilets, WaterAid, a sanitation charity, revealed in its report on Thursday.

Other countries among the 10 with poorest access to sanitation facilities include India, China, Nigeria, Indonesia, Russia, Bangladesh, the Democratic Republic of Congo, Brazil and Ethiopia.

India has the highest number of urban dwellers who do not have access to safe and private toilets ─ 157 million people.

With more people than ever before migrating to cities, finding a toilet is not only a chore but a public health issue for hundreds of millions of people around the world, WaterAid said.

Nearly one in five city dwellers, or about 700 million people worldwide do not have access to decent toilets, according to the Britain-based charity.

About 600 million people use dirty or crowded communal toilets and pit or bucket latrines, while some 100 million have no facilities at all, it said.

Ensuring sanitation for all by 2030 was among the global development goals adopted last year by the 193 members of the United Nations.

Here are a few facts from WaterAid's report on urban areas where toilet troubles are most pressing: