According to Ayurveda when you have low immune power you get dust allergy, some people are allergic to paint, flowers, some for the new clothes & so on..
Next Steps
Immunity has to be improved.
Health Tips
I cannot ask you to stop exposing to dust.. because evn if you dont do dusting /if you have a maid n when she is dusting too you will have continuous sneezing , etc so kindly improve your immunity.