U.S. EPA Sets Short-Term Exposure Standard for Sulfur Dioxide

U.S. EPA is setting a one-hour exposure standard for sulfur dioxide (SO2), intended to limit short-term exposure to the chemical, the first change in several decades. The one-hour standard will be set at 75 parts per billion (ppb). It is intended to protect individuals from short-term exposures of five minutes to 24 hours, EPA says. The agency is also requiring that monitors be placed anywhere SO2 emissions affect populated areas. New monitors must be operational by January 1, 2013; EPA will also use computer modeling as part of its compliance enforcement...

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