2002 Estimated County         
Average Ambient Air Concentration
            -New England-
             Ac etaldehyde
                                                     Distribution of U.S.
                                                  Ambient Air Concentration
                                                 (micrograms per cubic meter)
                                                        Acetaldehyde
                              U.S. Highest 100

                                      95
                                                             1.8-3.4
                                                             1.5-1.7
                                                             0.9-1.4
                                                             0.68-0.89
                                                             0.27 - 0.67
                                                             0.000035 - 0.26
                               Percentile  75
1
                                                                    Miles
                 Source: U.S. EPA/ OAQPS 2002 NATA. EPA Region 1- GIS Center Map Tracker ID= 4993
                                                                      SEFft

-------