The principal reference of contemporary practice for managing air emissions from wastewater systems. MOP 25 combines updated materials from two former WEF Publications - Odor Control in Wastewater Treatment Plants and Toxic Air Emissions from Wastewater Treatment Facilities into a comprehensive format. Public awareness of odors and air pollutants from wastewater facilities, as well as federal, state, and local regulations have evolved over the past 10 years, making the all-inclusive MOP 25 a critical manual for all professionals involved in managing air emissions from wastewater systems. Topics include: measurement and characteristics; regulations and policies; containment; chemical and physical treatment; atmospheric dispersion modeling; public health and public relations; and case studies involving odors and air emissions from wastewater treatment plants and collection systems.