Layer Estimates:

Layer: Site-Level Design Value History for the 2012 Annual PM2.5 NAAQS (ID:0)
Count: 1077
Extent:

XMin: -17740568.6864386
YMin: 2003921.39928962
XMax: -7211818.51686944
YMax: 9567842.46285758
Spatial Reference: 102100 (3857)