53 5.15.1 5.1 Acid Rain, The lines on the map are pH isopleths, which identify regions in which the precipitation has the same pH, as indicated by the numbers. Notice that precipitation gradually becomes more acidic going from west to east, especially in industrialized areas of the Northeast This acid rain may be a result of the release of nitrogen and sulfur oxides into the atmosphereAcid Rain: Acid Rain: The lines on the map are pH isopleths, which identify The lines on the map are pH isopleths, which identify regions in which the precipita regions in which the precipitation has the same pH, as indicated tion has the same pH, as indicated by the numbers. Notice that precipitati numbers. Notice that precipitation gradually becomes more acidic on gradually becomes more acidic going from west to east, especially in from west to east, especially in industrialized areas of the Nor industrialized areas of the Northeast. theast. This acid rain may be a result This acid rain may be a result of the release of nitrogen and su of the release of nitrogen and sulfur oxides lfur oxides into the atmosphere. into the atmosphere