Because air pollution is primarily an urban problem.

Homelessness is often considered an urban phenomenon.

We typically think of homelessness as an urban problem.

Abstract Homelessness is often conceptualised as an urban problem.

Homelessness is often considered an urban problem.

Homelessness is usually considered a mostly urban problem.

And it’s not just an urban problem, it’s also a rural problem.

This is not just an urban issue, it is a rural issue.

This is not just a rural issue; it is an urban issue as well.

This is not just an urban problem, it’s also a rural problem.

This is not just an urban problem, it’s also a rural problem.

Air pollution is not exclusively an urban problem.

The fact is that gun crime is primarily an urban issue.

Thus the main urban problem relates to the parking issue.

Some might think that big-time drug dealing is an urban problem.