Specialized equipment category for environmental protection and workplace environment improvement in manufacturing sites. Includes air pollution control devices (dust collectors, desulfurization equipment, denitrification equipment), water purification facilities (wastewater treatment systems, oil-water separators), noise and vibration control equipment, waste treatment facilities, and workplace environment monitoring instruments. This equipment group is designed for factory environmental regulation compliance, worker safety assurance, and reduction of environmental impact on surrounding areas, distinguished from production equipment and general HVAC systems as environment-specialized professional machinery.