Keep in mind that these activities can get you exposed to dangerous toxins and chemicals, like pesticides, adhesives, solvents, paint fumes, and some caustic cleaning products. You will also be facing the frequent attach of the harmful allergens and pollen. Wearing the dust face mask is the key to keeping yourself safe from those hazards.
Note that the plastic net shell for dust mask can keep you safe from the air that you are breathing in regardless of the activity you are doing.