Biological contaminants are living organisms or their derivatives such as bacteria, viruses, fungi, molds, mildews and house dust. They are often found in indoor environments where they can be easily transported in air. Some biological contaminants trigger allergic reactions and asthma. Infectious illnesses, such as influenza, measles, and chicken pox are transmitted through the air. Molds and mildews release disease-causing toxins. Risks from exposure to these contaminants can be reduced through proper ventilation and hygiene in the home. The EPA offers guidance on improving indoor air quality through its publications, outreach activities, hotlines and other resources.
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