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Note: For all listings above that contain the word “compounds” and for glycol ethers, the following applies: Unless otherwise specified, these listings are defined as including any unique chemical substance that contains the named chemical (antimony, arsenic, etc.).
a
The original list established under section 112(b)(1) of the Clean Air Act contained 189 HAPs. Caprolactam was removed June 18, 1996 (see 61 Fed. Reg. 30816 [1996]).
b
On May 30, 2003, EPA proposed to remove the compound methyl ethyl ketone (MEK) from the HAPs list (see 68 Fed. Reg. 32605 [2003]), and on November 21, 2003, it proposed to remove ethylene glycol monobutyl ether from the list (see 68 Fed. Reg. 65648 [2003]).
c
X′CN where X = H′ or any other group where a formal dissociation may occur. For example, KCN or Ca(CN)2.
d
The definition of glycol ethers has been modified to exclude surfactant alcohol ethoxylates and their derivatives (SAEDs) (65 Fed. Reg. 47342 [2000]).
e
Includes mineral fiber emissions from facilities manufacturing or processing glass, rock, or slag fibers (or other mineral derived fibers) of average diameter of 1 micrometer or less.
f
Includes organic compounds with more than one benzene ring and that have a boiling point greater than or equal to 100°C.
