Fundamentals of Stack Gas Dispersion is a book devoted to the fundamentals of air pollution dispersion modeling of continuous, buoyant pollution plumes from stationary point sources. The first edition was published in 1979. The current fourth edition was published in 2005. The book has received favorable reviews, including a description of its "simple straightforward explanations" for a "full course in single-source dispersive modeling". The book is now available only as a downloadable version in PDF format.