Haw. Code R. § 11-59-2 - Definitions
As used in this chapter: "Ambient air" means the general outdoor atmosphere to which the public has access.
"Reference method" means a method of sampling and analyzing the ambient air which the U.S. Environmental Protection Agency (EPA) specifies as a reference or an equivalent method, or absent EPA specifications, a method of sampling and analysis that the state director of health specifies as a reference.
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