The mark of any civilised society is and always has been how they maintain public health in their population centres. Managing waste like pollutants or food waste is a big part of that, as diseases will develop completely unchecked if they are ignored.
In order to keep urban environments clean, first of all you’ll need to ensure that the day to day waste being produced is systematically contained and collected. As a society, most of the western/developed world carries this out quite effectively through weekly or fortnightly trash collection, street cleaners picking up litter and recycling campaigns to raise public awareness. This system works well for waste which is reliably there, but less so for things which only occur periodically, such as the destruction of buildings due to disasters like fires and floods.
Building debris is less of a concern for contagious diseases, but it is still a very bad thing. It can have a massive negative impact on the health of those who are exposed to the toxic materials which money homes were built with (particularly if they’re older buildings), but at the very least have any waste around can destroy people’s drive to maintain their environment, which could lead to a steady deterioration of communities and house prices.
Having clean neighbourhoods is important for both our health and our pocket books. With most people being very invested in the value of their properties, maintaining a neighbourhood’s quality is essential for preserving their financial security, and people therefore need to be engaged in keeping its standards high, by doing what they can themselves and ensuring that those responsible for creating a mess are held responsible for cleaning it up.