Cough is an important natural defensive mechanism and protective reflex for clearing the upper and lower airways of excessive secretions such as mucus and inhaled particles. Cough is a common symptom of most respiratory disorders and may be indicative of trivial to very serious airway or lung pathology. (International Classification of Diseases, Eleventh Revision (ICD-11), World Health Organization (WHO) 2019/2021 https://icd.who.int/browse11. Licensed under Creative Commons Attribution-NoDerivatives 3.0 IGO licence (CC BY-ND 3.0 IGO). https://icd.who.int/browse/2024-01/mms/en#2027526159)
From a biological perspective, boreal forests are defined as forests growing in high-latitude environments where freezing temperatures occur for 6 to 8 months and in which trees are capable of reaching a minimum height of 5 m and a canopy cover of 10%. (http://ibfra.org/about-boreal-forests/)
