If someone recites the Holy Qur’an while others are busy doing their work, are they considered sinful as they do not listen to him?

Answer

Praise Be to Allah and Peace Be Upon His Messenger.

It depends on the situation and context of reciting the Holy Qur’an. If it is a lesson for recitation, the attendees have to listen and consider. If the recitation takes place in another location (stores, places of work, etc.) then, the one who reads must change the tone of his recitation and recite in a low voice so as to let people do their jobs successfully, or he can move to another place (a mosque) to recite as he likes.