单词	action level
释义	action level noun : the level of concentration of a harmful or toxic substance or contaminant (such as lead, asbestos, benzene, or radiation) that when exceeded is considered sufficient to warrant regulatory or remedial action Two-thirds of the more than 6,000 homes it tested in 2003 had lead levels exceeding the Environmental Protection Agency's "action level"—the safety level at which federal law requires a water system to take prompt steps to reduce lead levels and notify the public. Erik D. Olson, Washington Post, 8 Feb. 2004 Future clam digs are dependent on marine toxin levels, but the first set of samples dug last Sunday showed all results were still below the action level. Mark Yuasa, Seattle Times, 25 Oct. 2009 Word History First Known Use 1967, in the meaning defined above
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