This is an observational study which aims to evaluate the possibility of using data from a capnography device to assess obstructive airway severity in both Chronic Obstructive Pulmonary Disease (COPD) and Asthma patients.

This is an observational study which aims to evaluate the possibility of using data from a capnography device to assess obstructive airway severity in both COPD and Asthma patients. The study will include adult asthma and COPD patients (age >18). Patients will be enrolled on a continuous basis and will be monitored by capnograph and oximeter before and after lung function assessment and also during and after medical treatment.

Inclusion Criteria:

1. Age >18
2. Ability and willingness to participate the study and sign informed consent form
3. Asthma / COPD patients

Exclusion Criteria:

1. Pregnant women
2. Asthma or COPD patients with FEV1 > 80%
3. Disability or unwillingness to undergo capnography measurement
4. Cannot be assessed for FEV1
5. Oxygen supply >5 L/min
6. 6. Subjects that gone through LOBECTOMY OF LUNG in the last 5 years.

Asthma and COPD patients

Study publication will not contain any identifying data of individuals.