2002 Estimated County
Average Ambient Air Concentration
            -New England-
                 Diesel
                                                      Distribution of U.S.
                                                   Ambient Air Concentration
                                                  (micrograms per cubic meter)
                                                             Diesel
                                                              1.2-13
                                                              0.93-1.1
                                                              0.66 - 0.92
                                                              0.44 - 0.65
                                                              0.28-0.43
                                                              0.000035 - 0.27
                                                         0 10  20 30 40  50
                                            *
                                                                     I Miles
                  Source: U.S. EPA/ OAQPS 2002 NATA. EPA Region 1- CIS Center Map Tracker ID= 4993

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