Clearing the Air Indoor Air Exposures Asthma Development Biological Agents Chemical Agents Sufficient evidence of causal Sufficient evidence of causal relationship relationship House dust mite None found Sufficient evidence of association Sufficient evidence of association Environmental tobacco smoke None found (among pre-school aged children) Limited or suggestive evidence of Limited or suggestive evidence of association association Cockroach(among pre-school None found aged children) Respiratory syncytial virus(RSv)Clearing the Air: Indoor Air Exposures & Asthma Development Biological Agents • Sufficient evidence of causal relationship – House dust mite • Sufficient evidence of association – None found • Limited or suggestive evidence of association – Cockroach (among pre-school aged children) – Respiratory syncytial virus (RSV) Chemical Agents • Sufficient evidence of causal relationship – None found • Sufficient evidence of association – Environmental Tobacco Smoke (among pre-school aged children) • Limited or suggestive evidence of association – None found