Examines the human safety of exposure to air disinfection-relevant concentrations of triethylene glycol vapor, with a specific focus on individuals with asthma. The research builds on existing animal inhalation data to undertake an acute human exposure study using triethylene glycol. Metrics to assess reactions to glycol vapors will include changes in lung function, airway hyperresponsiveness, airway inflammation, oxidative stress, patient-reported outcomes, and other clinical metrics.