blog posts NASCAR in Chicago: How will downtown racing affect air quality? Jun 26, 2023 2:45 pm by Chicago TribuneIllinois in the News Share on Facebook Tweet Email Images Chicago Tribune (June 26) 'They are now using E15 fuel, which has lower emissions.... But, at the end of the day, (race cars) are still having a very low efficiency. So there’s no way around that,' says atmospheric sciences professor Nicole Riemer. Share on Facebook Tweet Email