Abstract: The article analyzes the reasons why the atmospheric hygiene protectection zone in part of construction remodeling or expanding projects fail to meet the requirements of relevant regulations and standards, and propose possible solutions. A leather manufacturing factory expanding project was selected to illustrate the solutions to insufficient atmospheric hygiene protection zone in a specific environmental impact assessment. By strengthening management, adjusting layout planning, and relocating, all residential areas were moved out of the atmospheric hygiene protection zone of the leather manufacturing factory project. The measures against insufficient atmospheric hygiene protection zone adopted in the case could provide reference for other environmental impact assessments.