A chronic noncancer IHB is a concentration in ambient air, at
or below which a chemical or defined mixture of chemicals is
unlikely to cause an adverse health effect to the general
public when exposure occurs daily throughout a person's
lifetime. Noncancer IHBs are used for effects other than
cancer. For implementation purposes, chronic IHBs are
typically compared to an annual average concentration of a
chemical or defined mixture of chemicals in air.

CAS Number: 56-55-3. One of the class of chemicals called
Polycyclic Aromatic Hydrocarbons (PAHs). Chemical formula =
C18H12. Molecular weight = 228.29 g/mol.

CAS Number: 206-44-0. One of the class of chemicals called
Polycyclic Aromatic Hydrocarbons (PAHs). A yellow, crystalline
hydrocarbon found in coal tar. It is used as an intermediate for
dyes, pharmaceuticals and agrochemicals. Chemical formula =
C16H10. Molecular weight = 202.26 g/mol.

CAS Number: 208-96-8. A polycyclic aromatic hydrocarbon (PAHs)
that is an odiforous chemical component of crude oil and coal
tar. Chemical formula = C12H8. Molecular weight = 152.20 g/mol.

CAS Number: 83-32-9. A white to light yellowish solid, used to
manufacture plastics, and as an intermediate in the manufacture
of dyes, pharmaceuticals, insecticide, fungicide, herbicide and
plant growth hormones. Chemical formula = C12H10. Molecular
weight = 154.21 g/mol.

CAS Number: 78-59-1. A watery white liquid with a peppermint-like
odor. It is used as a solvent, in some herbicide and pesticide
formulations and in adhesives for plastics, polyvinylchloride,
and polystyrene materials. Chemical Formula = C9H14O. Molecular
weight = 138.21 g/mol.

CAS Number: 532-27-4. A potent eye, throat, and skin irritant
used as a riot-control agent (tear gas) and in Chemical Mace
Chemical formula = C8H7ClO. Molecular weight = 154.59 g/mol.

CAS Number: 111-42-2. A colorless powder or liquid with a
slight ammonia-like odor. It is used in consumer care products
such as soaps, shampoos, pharmaceuticals and cosmetics. Chemical
formula = C4H11NO2. Molecular weight = 105.1 g/mol.

CAS Number: 98-86-2. A clear to light yellow liquid used as a
fragrance ingredient in soaps, detergents, creams, lotions, and
perfumes. It is also used as a flavoring agent in foods and
beverages, and as a specialty solvent for plastics and resins.
Chemical formula = C8H8O. Molecular weight = 120.15 g/mol.

CAS Number: 79-11-8. A very corrosive, water soluble,
crystalline solid with a penetrating, vinegar-like odor. It is used
in the manufacture of cellulose ethers, and as a post-emergence
contact herbicide and defoliant. Chemical formula = C2H3ClO2.
Molecular weight = 94.5 g/mol.