Input (grade 10): Ligny-l Ã s-Aire is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.
Output (grade 5): Ligny-l Ã s-Aire is a commune. It is found in the region Nord-Pas-de-Calais in the Pas-de-Calais department in the north of France.