1. a TRC Environmental Corporation , Austin , Texas , USA
2. b Consultant , Danville , California , USA
3. c University of California , Berkeley , California , USA
4. d Desert Research Institute , Reno , Nevada , USA
5. e Institute of Earth Environment, Chinese Academy of Sciences , Xi'an , China
6. f Envair/Aerochem , Placitas , New Mexico , USA
7. g The International Council on Clean Transportation , Washington , DC , USA
8. h University of California , Irvine , California , USA
9. i Environmental Defense Fund , Boulder , CO , USA
10. j Institute for Governance and Sustainable Development , Boulder , CO , USA
11. k Michigan Retired Engineer Technical Assistance Foundation , Livonia , Michigan , USA