Excerpt: ″Henderson also advocated that the tail pipes of cars, buses, and trucks be placed at the tops of the vehicles and pointed vertically so that the hot exhaust gases would be vented upwards. He argued that this would reduce pollution by carbon monoxide and other toxic gases at street level.″
"Henderson maintained a lifelong interest in air pollution, particularly the effects of automobile exhaust gas on city streets, again being far ahead of his time."
See also: The Grand Rapids Press, Thu, Jan 03, 1924 ·Page 6
National Academies of Sciences, Engineering, and Medicine. 1998. Biographical Memoirs: Volume 74. Washington, DC: The National Academies Press. https://doi.org/10.17226/6201.
Source: nap.nationalacademies.org
Source: nap.nationalacademies.org
"Dr. Yandell Henderson, Professor of Applied Physiology at Yale University, suggested as a partial solution that automobile exhausts be extended from the horizontal position at the level of the axle to a vertical one discharging like a chimney at the height of seven or eight feet. He conducted extensive experiments on Fifth Avenue, New York, and other motor-congested highways, proved that CO, even when not so dense as to cause prostration, affects people who inhale it adversely. The gas is heavier than air, and when discharged near the ground it stays there at the level of pedestrians."
—TIME May 26, 1924 12:00 AM GMT-4
"Dr. Miller Reese Hutchison, inventor of the Klaxon auto horn, acoustic devices for the deaf, etc., with a short-cut to the heart of the problem—a chemical compound, which, introduced into the gasoline, eliminates most of the monoxide from the exhaust fumes, as well as the bothersome carbon deposits in the cylinders. "
"The additive was marketed as Hutch-Olene," — https://en.wikipedia.org/wiki/Miller_Reese_Hutchison