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.).
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 ).
On May 30, 2003, EPA proposed to remove the compound methyl ethyl ketone (MEK) from the HAPs list (see 68 Fed. Reg. 32605 ), and on November 21, 2003, it proposed to remove ethylene glycol monobutyl ether from the list (see 68 Fed. Reg. 65648 ).
X′CN where X = H′ or any other group where a formal dissociation may occur. For example, KCN or Ca(CN)2.
The definition of glycol ethers has been modified to exclude surfactant alcohol ethoxylates and their derivatives (SAEDs) (65 Fed. Reg. 47342 ).
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.
Includes organic compounds with more than one benzene ring and that have a boiling point greater than or equal to 100°C.