Lower respiratory symptoms

Symptoms that relate to the lower respiratory tract, i.e. the lungs, trachea, and bronchi.

They include cough, phlegm, chest pain on deep inhalation, and wheeze.

Lower respiratory symptoms suggest the presence of asthma, an allergic reaction, or an infection.

Source: GreenFacts

Source: Student Health Services Respiratory Tract 

Ozone

Particulate Matter

Nitrogen Dioxide