Lead (2008 Standard) Design Value NotesReturn to Report
More detailed design value data can be found at http://www.epa.gov/airtrends/values.html
The level of the 2008 NAAQS for Pb is 0.15 micrograms per cubic meter (µg/m3) not to be exceeded in any 3-month quarter. The design value for the 2008 lead NAAQS is the maximum rolling 3-month lead-TSP average over a 3-year period.
2008 Lead area designations were effective on December 31, 2010. Effective December 31, 2011, five additional areas were designated nonattainment. These areas were: Arecibo, PR; Belding, MI; Chicago, IL; Pottawattamie, IA; and Saline County, KS.
For Frisco, TX, the design value for each 3-year period listed here is based on data from monitors sited outside of the fence surrounding the dominate Pb source. When data from site 480850009 during the period in which it was located a few feet inside the fenced are considered, design values in many 3-year periods are higher.