County Boundary
Interstate
Census Tract
Ambient Air Concentration:
PAI-IPOM
(ig/ m3
U.S. Highest 100
75
Percentile 50
0.016-1.4
0.0091 -0.016
25		0.0048 - 0.0091
U.S. Lowest o		0.00 - 0.0048
2005 Estimated Census Tract
Ambient Air Concentrations:
PAHFOM
-New England-
Source: U.S. EPA/ OAQPS 2005 NATA. EPA Region 1- GIS Center Map Tracker ID— 7260. January 21, 2011
oEFft

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