Institution: | 1. Director of Engineering , L. A. County Air Pollution Control District , Los Angeles , Calif , USA;2. Senior Research Assistant , L. A. County Air Pollution Control District , Los Angeles , Calif , USA;3. Assistant Director of Engineering , L. A. County Air Pollution Control District , Los Angeles , Calif , USA;4. Intermediate Air Pollution Engineer , L. A. County Air Pollution Control District , Los Angeles , Calif , USA |