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_73907 ( "Municipality" text, "No. of Barangays" real, "Area (km\u00b2)" text, "Population (2010)" real, "Pop. density (per km\u00b2)" text, "Income Class (2004)" text )

### Question ###
List the population density per kilometer for the city of abra de ilog.

### Accurate SQL ###

SELECT "Pop. density (per km\u00b2)" FROM table_73907 WHERE "Municipality" = 'Abra de Ilog'