We are also using measurements of certain commercial chlorofluorocarbons to determine the effect of the transport of Los Angeles emissions on distant pristine areas. The overall height of each stacked bar is proportional to the ambient mass concentration of particles less than 2.5 um in diameter. The shaded portions show the contributions of sulfates and non-volatile organics to this total. Organics and sulfates together account for the bulk of the fine-particle mass at most sites. Association of particle light-scattering in the southwestern U.S. desert with individual chemical fractions.
Distinct symbols represent distinct ranges of the scattering coefficient bsp.