Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1828368_1 ( pop_density__km_2__ VARCHAR, area__km_2__ VARCHAR )

### Question ###
What are the population densities of all communes with an are of 28.3 sq.km.?

### Accurate SQL ###

SELECT pop_density__km_2__ FROM table_1828368_1 WHERE area__km_2__ = "28.3"