Science Past from the issue of July 28, 1962

BATTLE AGAINST EXHAUST POLLUTION — The automobile exhaust problem is being attacked from many directions in an effort to preserve man’s most necessary commodity, air…. In response to regulations by local and state governments and prodding from the Federal Government, several exhaust-trapping devices for cars have come on the market, none of which controls all of the poisonous gases emitted during combustion. One, the “blow-by” or crankcase ventilation system, has received Federal approval and will be standard equipment on all 1963 cars. There are at present two ways of monitoring automobile exhaust: 1. Recycling unburned exhaust gases back to the engine; 2. Reburning the gases in the exhaust system. Several manufacturers have marketed equipment utilizing these methods.