Is there any law that specifies how far a public latrine must be built from a residential area?

About 5 meters.

Shanghai Municipal Regulations on the Establishment of Urban Environmental Sanitation Facilities" Chapter 2 Sanitation Public Facilities Set Up Section 2 Public Toilets Article 12 Public toilets are divided into Class I, Class II and Class III; The design and construction of public toilets must meet the following requirements:

The distance between freestanding public toilets and other buildings should be about 5 meters. The building shape of the public toilet should be coordinated with the nearby building complex, and the entrance and its vicinity should be set up with uniform signs that are easy to see day and night; Greening should be done around freestanding and attached public toilets; Where public toilets are set up in public buildings, there shall be obvious guide signs.

This toilet was built at the back of my house just over three meters away, which seriously affected the ventilation of the windows.

Hello, no, the specifics are determined by identification.

No. And the public toilet is a public facility wherever it goes. It is not a garbage dump and the funeral home has restrictions.

It is recommended to consult your local urban management bureau for this question!

The law doesn't specifically stipulate that if you feel that it affects you, go for an administrative review, and you can also sue.