2002 Estimated County         •
Average Ambient Air Concentration
             -New England-
              1,3-Butadiene
                                                          Distribution of U.S.
                                                       Ambient Air Concentration
                                                      (micrograms per cubic meter)
                                                              1,3-Butadiene
                                                  U.S. Highest too

                                                           95
                                                   Percentile
                                                           90
                                                           75
                                                           50

                                                           25
                                                Lowest in the U.S. 0
 ug/m
1.06e-001 - 5.27e-001
8.25e-002 - l.Ole-001
5.31e-002 - 8.10e-002
3.35e-002 - 4.88e-002
6.27e-003 - 3.31e-002
4.31e-004 - 5.12e-003

Interstate

  N
                                                                           I Miles
            Source: U.S. EPA/ OAQPS 2002 NATA Final. EPA Region 1- GIS Center Map Tracker ID= 6208

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