Affiliation: | 1. Director of Engineering , Los Angeles County Air Pollution Control District , Los Angeles , California , USA;2. Senior Air Pollution Analyst , Los Angeles County Air Pollution Control District , Los Angeles , California , USA;3. Principal Air Pollution Engineer , Los Angeles County Air Pollution Control District , Los Angeles , California , USA;4. Senior Air Pollution Engineer , Los Angeles County Air Pollution Control District , Los Angeles , California , USA |