Columbia subject headings:
Air--Pollution--United States.
Health risk assessment--United States.
Lungs--Diseases--Epidemiology.
Lungs--Pathophysiology.
Pulmonary toxicology--United States.
Pulmonary toxicology.
Harvard subject headings:
Air--Pollution--Government policy--United States
Health risk assessment--United States
Lungs--Diseases--Epidemiology.
Pulmonary toxicology--United States.
Princeton subject headings:
Air--Pollution--United States.
Health risk assessment--United States.
Lungs--Diseases--Epidemiology.
Pulmonary toxicology--United States.