The geotroposphere is the region that forms an interface between the Earth's soil and its lower troposphere (the lowest region of the atmosphere). It extends from the lower levels of the soil's vadose (unsaturated) zone, ranging from centimeters to meters deep depending on the depth of the water table, to the upper levels of the mixing zone in the troposphere, ranging from meters to hundreds of meters in altitude depending on the troposphere's vertical temperature profile (atmospheric stability). Emerging research on the geotroposphere considers the production, transport, and transformation of pollutants and nonpollutants in the soil and lower troposphere with an emphasis on the basic physical, chemical, and microbiological processes involved. The objective of this research is to control environmental pollution and, as a result, protect public health.