What can I do? The police have come out several times, given warnings, and issued several citations to my neighbor. If my house catches fire I want to make sure there is a fire hydrant available. Should I tell the fire department?
It depends what city you live in; Indiana does not have the kind of comprehensive landlord-tenant law that many other states have. For example, in Bloomington's city code it states: Fire extinguishers and smoke detectors must be provided and installed by the landlord. Tenants are responsible for maintaining and replacing batteries for detectors within the unit. But there is no statewide code.
Most sun screens work like house paint in that they contain a chemical compound that reflects light. This can be either Titanium Dioxide or Zinc Oxide. Titanium Dioxide is used in house paint to reflect light that hits it and make the paint look less translucent. People who say they are wearing Zinc are probably just wearing a sunscreen whose reflective material is Zinc Oxide.