Mold
It’s a type of fungus that puts tiny particles called spores into the air. They can sometimes cause serious lung infections if you have mold allergies, a lung condition such as chronic obstructive pulmonary disease (COPD), or a weak immune system – your body’s defense against germs. If you’re sensitive to mold, fix any leaks in your home and avoid compost piles and lawns with clumps of cut grass.