1.4 South Eastern Aerosol Research and Characterization (SEARCH) Study

12

13 This study experiment is an industry-funded network of 8 sites that originally emerged

14 from the Southern Oxidants Study (SOS) in the 1990s and has operated for over a decade in

15 response to the 1997 revisions to the national ambient air quality standards for ground-level

16 ozone and particulate matter. SEARCH is part of a public-private collaboration that provides an

17 array of standard criteria pollutant measurements but also includes daily 24-hour PM speciation

18 at selected times and locations, gaseous ammonia, reactive nitrogen (NOy), and true nitrogen

19 dioxide (i.e., a measurement of NO2 concentration unaffected by other nitrogen oxides, which

20 contaminate FRM NO2 measurements). These measurements had not been available in major

21 government-funded routine networks and in order to identify sources of ozone precursors and

22 fine particulate matter and to attribute health effects to specific components, the SEARCH

23 project sponsors believe that it is necessary to measure pollutant composition as well as mass.

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