The 20th North American Mine Ventilation Symposium (NAMVS 2025) convened in Southpointe near Pittsburgh, Pennsylvania between June 21–26, 2025. It represents a significant milestone in a series that has, since 1982, provided an authoritative forum for advancing the science and engineering of mine ventilation. Over four decades, NAMVS has become an essential platform for disseminating research, fostering professional exchange, and shaping practice in underground environmental control.

The proceedings of this twentieth symposium present rigorously peer-reviewed papers covering both established and emerging areas of ventilation. Technical sections address numerical modeling and simulation, diesel emissions and air quality control, ventilation monitoring and automation, mine fans and airflow equipment, coal and nonmetal mine ventilation, mine gases and dusts, planning and design, gob ventilation and methane management, heat and humidity, and mine fires. Collectively, these contributions illustrate the breadth of contemporary challenges and innovations influencing ventilation science and practice.

With emphasis on worker health and safety, energy efficiency, and climate-adaptive technologies, this book underscores the role of ventilation engineering in enabling sustainable mineral resource development. It will serve as a comprehensive reference for researchers, educators, practitioners, and policymakers engaged in ensuring safe and efficient underground mining operations.