- Induced sputum will be collected 6 hours after initiation of exposure after subjects have been premedicated with albuterol. The subjects will be observed at the study site until sputum induction is complete. Subjects will not be discharged home following the post-exposure sputum induction until FEV1 is within 90% of baseline values and vital signs are normal. Subjects not meeting safety criteria at the end of the exposure day will be admitted to the GCRC for overnight observation.