An environmental group that has been urging the EPA to regulate avgas in piston-powered aircraft released a new report this week on lead emissions in its ongoing campaign to remove 100LL from airport pumps. Friends of the Earth says that EPA data shows that piston-engine aircraft using leaded avgas account for about 50 percent of lead emissions in the U.S.
Source: avwebEnvironmental Report Pushes For 100LL Replacements