Is it permissible for a traveler to break their fast daily in Ramadan if they travel more than 200 kilometers due to work circumstances and changing weather, and what is the expiation for that?

It is permissible to break the fast while traveling if the distance reaches that which permits shortening prayers. The missed days must be made up without expiation, based on the Almighty's saying: ﴿[Fasting for] a limited number of days. So whoever among you is ill or on a journey [during them] then [he must fast] an equal number of days from other days.﴾ [Al-Baqarah:184].