Hi, mild occasional dry cough which is not troubling you or not hindering you in your daily activity then it should not be any reason to worry. It could be due to exposure to dust.
Next Steps
Watch for few more days and see does the cough worsens or remains the same and also observe for any other associated symptoms.
Health Tips
If you any time develop cough with sputum or breathlessness, kindly visit the nearest emergency department.