Table 3. Airport pollution effects on the respiratory tract in vivo.

People exposed	Respiratory symptoms	Ref.
Airport vicinity exposure	Coughing, shortness of breath, wheezing onset and decreased lung function	[18]
	Exacerbation of pre-existing respiratory diseases	[4]
Airport occupational exposure	A runny nose and a cough with phlegm	[20]
	Chest illnesses	[21]
	Exacerbation of pre-existing respiratory diseases	[28]
	Chromium can be deposited in the respiratory tract	[29]