1.Newly renovated or renovated residence.
2.There are homes for the elderly, children, pregnant women and newborns.
3.There are homes for people with asthma, allergic rhinitis and pollen allergies.
4.A home for keeping pets and livestock.
5.More closed or affected by secondhand smoke.
6.Hotel, public place.
7.People who are willing to live with a high quality of life are willing to live in their homes.
8.Hospital, reduce infection, prevent transmission of disease.