(A). Clinical Studies The clinical study is intended to obtain data characterizing eNO concentrations within individual groups of subjects listed in the inclusion criteria. The type of this study is “non-invasive”, and the study design is “diagnosis/ treatment monitoring, and efficacy”. The study will seek to recruit subjects who fall into one of the categories listed in the inclusion criteria below. The number of subjects (n) to be recruited for each category is given and is estimated based on the past number of subjects mainly at the Ekips Technologies, The Oklahoma Allergy & Asthma Clinic, and the Norman Lung Center sites.