AG 2007 11 19 - Laserfiche WebLink

Home Browse Search

- "Primary standards to protect public health, including the health of `sensitive' populations such as asthmatics, children,-:and the elderly - "Secondary standards to protect public welfare, including limiting environmental damage to sensitive vegetation, and ecosystems: ' (U.S. Envi[onmental Pro[ection Agenry,lhtm~//~wnv cnn,gyy/aido~oncn5[llution/na~c~smv20Q],hta~][yptjpl;,i, Accessed 9/7/07) Proposed Revisions "On June 20, 2007, EPA Proposed To Strengthen The National Ambient Air Quality Standards For Ground-Level Ozone, The Primary Component Of Smog." (P,nvi[onmental Protection Agenry,hmr//wwwe~te/air/mone~ollution/Pylfs/^_11!1706_20 fs Pdf, Accessed 9/11/07) The EPA's Proposal Revises The Ozone Standards Set In 1997, Which Is Currently An Eight Hour Standard Of .08 Pans Pet Million. "EPA's proposal would revise both ozone standards: the primary standard, designed to protect human health; and the secondary standard, designed to protect welfare (such as vegetation and crops). The existing primary and secondary standards, set in 1997, are identical: an 8houx standard of 0.08 parts per million (ppm). (In practice, because of rounding, an area meets the standard if ozone levels axe 0.084 ppm ox lower.)" (P,nvi[onmental Protection Agenry,lutv~//urv~guarc~.ov/-ie/owne8dllutivn/~{j;/~(170630 fa.vdE Accessed 9/11/07) "Proposed Revisions To'The Primary Standard: - "EPA proposes to set the primary (health) standard to a level within the range of 0.070- 0.075 ppm (70 -75 ppb)• The Agency also requests comments on alternative levels of the 8- houx primary ozone standard, within a range from 0.060 ppm up to and including retention of , the current standard (0:084 ppm). (EPA also proposes to specify the level of the primary standard to the third decimal place, because today's monitors can detect ozone that accurately.) "Proposed Revisions To The Secondary Standard: "EPA is proposing two options for the secondary standard: - "One option would establish a new form of the standard designed specifically to protect sensitive plants from damage caused by repeated ozone exposure throughout the growing season. This cumulative standard would add daily ozone concentrations across athree-month period. EPA is pxopositlg to set the level of the cumulative standard within the range of 7 to 21 ppm-hours. - "The other option would follow the current practice of making the secondary standard identical to the proposed primary 8-hoax standard." (Envi[onmental Protection Agenry, ~~//wanv e[lggovhdr/o¢c nepollurion/pdfs/2007UG2U fs odf, Accessed 9/11/07) EPA Will Issue Final Standards By March I2, 2008. Estimated Ti>~eline Fot Implementing The Proposed Standards C~ '~O 2