Estimated background PM<sub>10</sub> and PM<sub>2.5</sub> concentrations (µg/m<sup>3</sup>) across contiguous U.S. counties.

Abstract

<p>A—PM<sub>10</sub> yearly median concentrations (averaging 1999–2005), assessed with ordinary kriging, exponential covariance, lag distance = 125 km, nugget = 0.037, range = 1,538 km, partial sill = 0.083; B—PM<sub>2.5</sub> yearly median concentrations (averaging 1999–2005), assessed with ordinary kriging, spherical covariance, lag distance = 170 km, nugget = 0.014, range = 1,687 km, partial sill = 0.066.</p

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