ELECTRIC VEHICLES 331 commend your Committee and the Committee on Commerce on the penetrating and discerning evaluation of vehicle emission control progress that your Hearings have provided. Sincerely yours, ROBERT G. DUNLoP, Chairman of the Board. Senator BAim. I have no further questions. I would like to once again commend the witness on his statement, and for his candid responses to the questions. Senator BAYR. Senator Scott. Senator ScoTr. Thank you very much, Mr. Chairman. Mr. Dunlop, I will repeat what Senator Baker has said as to the great helpfulness of your statement, because it is most useful, as these hearings are, in educating us on the problem with which we are not familiar. I am going to ask questions only in one area. As head of the Petroleum Institute, engaged in seeking the ultimate clean engine-and I haven't heard anything yet about the problem of pollution from aviation, yet it is a common experience of all of us to notice these great clouds of what looks like powdered graphite coming out of the exhaust of every plane which passes overhead. And there isn't a street, a house or yard in this city which hasn't been grimed to a degree by this exuberant excretion of noxious materials. [Laughter.] I wonder how much research is being done to clean up the pollution caused by these monstrous craft as they go overhead. Mr. DunLoP. Senator, I wish I could be more encouraging in that regard than I feel entitled to be in connection with the automobile engine. Generally the pollutants from jet aircraft aren't viewed as being as significant as those of the automobile, because they occur in the atmosphere at higher levels. And they don't create the problem that the automobile emission does at essentially ground level. I must concur with you that this is an area that increasingly should have attention. Senator BATH. If the Senator will yield, I might point out that the Subcommittee of Public Works has a study that was conducted by the city of Los Angeles which we should make available for this hearing. There is also an additive that is being considered for addition to aviation fuels which, if it works out, is supposed to take care of this excretion. Excuse me. I thought the Senator would like to know about that, and we could make that available. Senator ScoTr. I am glad to know of this. What I am pursuing is an effort to discover whether there is any extensive research being undertaken either by private industry or by the Government which has specific application to this problem of pollution by planes. Mr. DuNLoP. I do know this, Senator Scott, that the oil industry is directing attention to these problems insofar as jet fuels and diesel fuels are concerned, because the problem is somewhat similar in those two fuel usages. As the chairman has indicated, there are additives that can be added to both jet fuels and diesel fuels that make a very substantial contribution to the elimination of the problem that you see either going