Layer Estimates:

Layer: PopulatedTracts2_0_May2015 (ID:0)
Count: 8035
Extent:

XMin: -373976.1293
YMin: -604416.4508
XMax: 540027.161899999
YMax: 450022.4913
Spatial Reference: 3310 (3310)

Layer: High pollution, low population (ID:1)
Count: 8035
Extent:

XMin: -373976.129295297
YMin: -604512.649477239
XMax: 539719.617302921
YMax: 450022.49131049
Spatial Reference: 3310 (3310)