Table 3 Inclusion and exclusion criteria

• The informed consent for participation in the study has been signed by the participant

• The participant’s age from 18 years (inclusive) and above

• Willing to perform the spirometry and answer to the study questionnaire

• ≥10 year of residence in selected city according to confirmation provided by participant

• Any contraindication for lung function test, which may have potential harm to participant based on a judgment of Investigator

• Age < 18 years old

• Duration of permanent residence in selected study city <10 years

• Inability to perform the spirometry or respond to questionnaires

• Known hypersensitivity or contraindications to bronchodilator (salbutamol)

• Subjects with a pre-existing condition which, in the opinion of the investigator, would compromise the safety of the subject in this study