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Example sentences for: ttn

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The USEPA National Air Toxics Assessment (NATA, http://www.epa.gov/ttn/atw/nata/) combines information on point and nonpoint emissions of air toxics and weather information into an Assessment System for Population Exposure Nationwide (ASPEN).
-pages 112-3, http://www.epa.gov/ttn/atw/sab/natareport.pdf
As exposure to each compound has a different risk, we standardized the exposure by multiplying the estimated average annual concentration of each compound by its Unit Risk Estimate (URE) as shown in Equation 1. The URE is the lifetime risk of excess cancer cases predicted to come from continuous exposure to a compound at a concentration of 1 μg/m 3in the air (for more information see definition on the NATA website, http://www.epa.gov/ttn/atw/nata/gloss1.html.