Clearing the Air Indoor Air Exposures and Asthma Exacerbation
		Biological Agents § Sufficient evidence of a causal relationship §    Cat §    Cockroach §    House dust mite § Sufficient evidence of an association §    Dog §    Fungi/Molds §    Rhinovirus § Limited or Suggestive Evidence of an Association §    Domestic birds §    Chlamydia and      Mycoplasma      pneumoniae §    RSV		Chemical Agents § Sufficient evidence of a causal relationship § Environmental tobacco smoke (in preschool- aged children) § Sufficient evidence of an association §    NO2, NOx (high levels) § Limited or suggestive evidence of an association §    Environmental tobacco smoke (school-aged, older    children and adults) §    Formaldehyde §    Fragrances