The cough is most probably due to upper respiratory infection.
You should take steam inhalation once or twice daily. (Can put small amount of Vicks in it)
Drink clean and warm water for few days.
Protect yourself from dust by using a mask.
For further evaluation and medication consult me online.
Next Steps
Follow the above mentioned things and if needed consult me online.
Health Tips
Cough for more than a week should be diagnosed and treated immediately.