 The Federal Emissions Control Law, passed in March 1974, provided protection from noxious gases, noise, and air-borne particulate matter.In August 1971, a law came into force directed at reducing atmospheric pollution from lead compounds in four-stroke engine fuels.As a safeguard against radiation, a decree on the system of authorisations for medicaments treated with ionizing radiation or containing radioactive substances, in its version of 8 August 1967, was remodelled by a new Decree of 10 May 1971 which added some radionuclides to the list of medicaments which doctors in private practice were authorized to use.