Lenny Siegel, executive director of the Center for Public Environmental Oversight, who helped organize the drafting of the letter, said in an e-mail that the E.P.A.'s action would "lead directly to more protective exposure standards for vapor intrusion, and it is also likely to cause the re-evaluation and possibly lowering of the drinking water standard for TCE".
Among them: conserving energy; cleaning up coal-fired power plants, dirty diesel engines and ocean-going vessels; and tightening ozone and particulate exposure standards.
There is conflicting evidence on the level of anesthetics that impairs neurobehavioral performance, leading to differences in exposure standards (25 or 50 ppm for N2O).
Make a looser set of exposure standards for long-distance space hangs?
When interviewed for the Center's series, agency head David Michaels blamed the "very, very complex, onerous process" he must go through to promulgate chemical exposure standards.
Exposure standards are needed but controversial.
Many exposure standards are based on this assumption.
Where data are sufficient, safe exposure standards should be set (e.g., wheat allergen) and maintained.
Exposure standards have been issued that limit exposure to thermally safe levels.
Use of such data could compromise conditions for setting adequate exposure standards.
Because of the health effects related to environmental exposures, exposure standards have been suggested (Rylander 1997).
