Columbia subject headings:
Air quality management.
Chemicals--Health aspects.
Chemicals--Physiological effect.
Hazardous substances--Environmental aspects.
Hazardous substances--Health aspects.
Pollution--Health aspects.
Pollution--Physiological effect.
Pollution.
Toxicology.
Harvard subject headings:
Air quality management.
Chemicals--Health aspects.
Chemicals--Physiological effect
Gases, Asphyxiating and poisonous.
Hazardous substances--Environmental aspects.
Hazardous substances--Health aspects.
Pollution--Health aspects.
Pollution--Physiological effect
Pollution.
Toxicology.
Princeton subject headings: