The respiratory tract is exposed to outside environment but possesses a complicated but comprehensive series of defenses against inhaled material. As air passes through the nose, large particles of debris are filtered out by cilia and by mucus that is secreted from the mucous membrane lining the nasal cavity. The air then travels through the pharynx, which is the last portion of the upper airway, through the larynx, which is the beginning portion of the lower airways, and into the trachea. Further filtration of the air occurs as it passes over cilia and sticky layers of mucus in the trachea. In addition, lymphatic vessels in the wall of the trachea transport cells of the immune system, such as lymphocytes and macrophages, which act to trap and destroy foreign particles. 
Respiratory disease is a type of disease that affects the lungs and other parts of the respiratory system. Respiratory diseases may be caused by infection, by smoking tobacco, or by breathing in secondhand tobacco smoke, radon, asbestos, or other forms of air pollution. Respiratory diseases include asthma, chronic obstructive pulmonary disease (COPD), pulmonary fibrosis, pneumonia, and lung cancer. Also called lung disorder and pulmonary disease. 
Publications and factsheets
American Lung Association 
Chronic respiratory diseases (WHO) 
Chronic obstructive pulmonary disease (COPD) 
Air pollution 
Household air pollution and health 
Respiratory diseases statistics (EU) 
SUPREME PHARMATECH is one of the leading research and production companies, working in the field of integrative medicine.
Integrative medicine is practicing medicine in a way that selectively incorporates elements of complementary and alternative medicine into comprehensive treatment plans alongside conventional methods of diagnosis and treatment.