Pollution
USEPA Proposes One — Hour Sulfur Dioxide Standard, to Drop 24 -hr and Annual Primary Standards
November 18, 2009 07:10 AM - Roger Greenway, ENN
The US Environmental Protection Agency has proposed a new one — hour Sulfur Dioxide (SO2) standard. The SO2 standard has not been changed since 1971. There has not been a health based standard shorter than 24 hrs for SO2 since short term acute effects have not been well known. A secondary standard of 3-hrs has been in effect. This was set to address welfare considerations, not health.
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