Layer Estimates:

Layer: Air Districts, California, 2004, CARB (ID:0)
Count: 47
Extent:

XMin: -13849214.4306483
YMin: 3833616.72311041
XMax: -12705058.7105245
YMax: 5162453.5838123
Spatial Reference: 102100 (3857)

Layer: Air Districts, Nevada, 2007, R9 (ID:1)
Count: 3
Extent:

XMin: -13358980.0038439
YMin: 4164165.26261908
XMax: -12694836.9883048
YMax: 5161311.05373886
Spatial Reference: 102100 (3857)

Layer: Air Districts, Arizona, 2007, R9 (ID:2)
Count: 4
Extent:

XMin: -12781326.5204028
YMin: 3676156.34405558
XMax: -12138862.6104564
YMax: 4439928.05164694
Spatial Reference: 102100 (3857)