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June 22, 2010

EPA Sets Stronger Air Quality Standard for Sulfur Dioxide

The U.S. Environmental Protection Agency (EPA) is issuing a new health standard for sulfur dioxide (SO2) - the first new SO2 standard in 40 years. Exposure to SO2 can aggravate asthma and cause other respiratory difficulties.

EPA set a one-hour SO2 health standard at 75 parts per billion to protect against short-term exposures, and is revoking the current 24-hour and annual SO2 health standards because science indicates that short-term exposures are of greatest concern. EPA is also changing the monitoring requirements for SO2 to assure monitors will be placed where SO2 emissions impact populated areas. Any new monitors required by this rule must begin operating no later than Jan. 1, 2013. Learn more here.

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