The researchers used a model to study acid rain and sulfur dioxide pollution in China. They found that sulfur concentrations are higher in the north compared to the south, with high sulfur deposition in certain areas. About 48% of sulfur deposits as dry deposition, 38% as wet deposition, and only 14% is transported out of the region. This information was used to designate acid rain control zones in China and plan programs for regional acid rain control.