![Sources of Air Pollution](https://image.tmdb.org/t/p/w300/dWWOnBrFmSlW7qjkTOLdUF5qIiV.jpg)
Sources of Air Pollution
A color film showing the principal sources of air pollution in the United States and discussing the consequences.
- Seánra: Documentary
- Stiúideo: U.S. Office of Education, Department of Health, Education and Welfare, United States Public Health Service
- Eochairfhocal:
- Caitheadh: Thomas F. Williams