Professor Gabe Fillippelli, executive director of the I.U. Environmental Resilience Institute, about past studies into ozone levels in NWI and from where they originate; he thinks a lot come from vehicles, especially the heavy truck traffic that crosses the Region. He advocates cleaner energy sources, including expansion of electric commuter trains that include the South Shore Line projects. He also encourages more smaller vehicles (trucks, etc) to go to cleaner fuels.