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_10342194_3 ( district VARCHAR, total_amount_of_trees VARCHAR, amount_of_old_trees VARCHAR )

### Question ###
What is the district when the total amount of trees is smaller than 150817.6878461314 and amount of old trees is 1,928 (1.89%)?

### Accurate SQL ###

SELECT district FROM table_10342194_3 WHERE total_amount_of_trees < 150817.6878461314 AND amount_of_old_trees = "1,928 (1.89%)"