Fig. 1.

Dependence of nucleation rates (J = J_{1 nm}) in the atmospheric boundary layer on [H₂SO₄]. The solid diagonal lines, which provide bounds for atmospheric observations, show that nucleation rates range from 10⁻² to 5 × 10⁻⁶ times the sulfuric acid vapor collision rate (428 data points for Mexico City, 31 data points for Atlanta 2009, 115 data points for Atlanta 2002, 602 data points for Hyytiälä, 86 data points for Idaho Hill, 107 data points for Mauna Loa, 11 data points for Macquarie Island, 180 data points for Boulder).