From the Conclusion ... 'An ecological review on air pollution as a whole, and in particular the relationship of control burning to such possible pollution warrants the following conclusions: (1) In spite of the tremendous amounts of pollutant materials released into the atmosphere, mankind as yet has not materially affected air quality on a global basis. . . (2) The air pollution problem, presently, is primarily one of urban areas. . . (3) Smoke particles from lightning fires have always been a part of our atmosphere long before man. These particles play an important part in our atmosphere as condensation nuclei for rainfall and are a vital part of our atmosphere. (4) There is no evidence that materials resulting from controlled burning in forestry, agriculture, or wildlife management are hazardous to human health. (5) The problems of such controlled burning are primarily one of visibility. . . but this can be handled by proper management, particularly with due regard for meteorological conditions. . . (6) I find that control burning as a source of air pollution is rarely if anything but a purely local matter. . . (7) And in final conclusion I wish to state that there is no ecological alternative to control burning for its many important uses in wildlife, forest and farm management. . . . Also includes extensive bibliography.'