0_Apprentice
I am allergic to dust.
1_Wizard
Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment 
0_Apprentice
I get very sick when there is a lot of dust.
1_Wizard
fine particles of matter is what we refer as dust
0_Apprentice
Yes and it is such a nuisance.
1_Wizard
It generally consists of particles in the atmosphere that come from various sources such as soil, dust lifted by weather
0_Apprentice
I am also allergic to house dust which contains skin and fabric particles.
1_Wizard
Our environments contains small amounts of plant pollen, human and animal hairs, textile fibers, paper fibers, minerals from outdoor soil,which has inherent dust