when did they take lead out of gas
Tetraethyllead By 2011, the United Nations announced that it had been successful in phasing out leaded gasoline worldwide. "Ridding the world of leaded petrol, with the United Nations leading the effort in developing countries, has resulted in $2.4 trillion in annual benefits, 1.2 million fewer premature deaths, higher overall intelligence and 58 million fewer crimes," the United Nations Environmental Programme said.[73][74] The announcement was slightly premature, as a few countries still have leaded gasoline for sale as of 2013 (see above).
Odorizer A major spur to the development of gas odorants and odorizers was the March 18, 1937 natural gas leak that blew up a school in New London, Texas, killing 294 children and teachers.