Preface XV and moisture transfer. Chapter 19 presents the 3D particle tracking velocimetry method applied to the monitoring of air displacements and pollutant dispersion in rooms. Chapter 20 describes the use of environment friendly wind driven ventilation to improve the quality and comfort of human existence. This chapter focuses on wind driven ventilation systems that utilize wind as a natural energy to provide improved air quality within buildings. Chapter 21 studies the ability of the desiccant unit to remove IAQ-related microorganisms from the air. The ability of active desiccants to remove particulates, bioaerosols, chemical pollutants, and water vapor from the airstream delivered to a building provides a unique opportunity to view active desiccant technology as a viable control strategy for enhancing and maintaining a favorable IAQ in cooling climates. Chapter 22 studies indoor climate (temperature and humidity conditions) and energy use and the factors that affect them in typical apartment buildings erected from prefabricated concrete elements in Estonian cold climate. Chapter 23 illustrates the air pollution problem in rural areas. This chapter mentions the major air pollutants in rural areas, in indoor and outdoor environments, their natural and anthropogenic sources and health impacts. It clearly declares the necessity to strengthen both the quantity and quality of evidence linking air pollution and various health outcomes, especially for developing countries and for health conditions with weak or no evidence. Chapter 24 illustrates the use of computational fluid dynamics methods to design ventilation systems that reduce the ammonia concentration in pig housing and simultaneously reduce the required ventilation capacity. Chapter 25 describes differences in indoor air quality in horse stables under winter and summer conditions and studies correlations between selected components of stable air and indices of respiratory health in people and in stabled horses spending considerable time in the stable environment. Results contribute to the identification of suitable biomarkers to monitor the indoor horse stable environment and respiratory health in humans and horses.This book provides a source of material for all those involved in the field, whether as a student, scientific researcher, industrialist, consultant, or government agency with responsibility in this area.It should be emphasized that all chapters have been prepared by professionals who are experts in their research fields. The content of each chapter expresses the point of view of its authors who are responsible for its development. All chapters have been submitted to reviews in order to improve their presentation following several interactions between the Editor-Publisher-Authors. In this sense, the Editor, the Publisher and hard-working air quality professionals have worked together as a team to prepare a book that may become a reference in the field next years. This will have been achieved, mainly, thanks to the group of experts in their resear...