Automobiles — United States — Pollution control devices — Law and legislation.

Bi-monthly newsmagazine which focuses upon issues from the Great Plains.|HIGH PLAINS NEW SERVICE : APRIL 4 / produced by Peggy Berryhill and Mary Boyle. Bi-monthly newsmagazine which focuses upon issues from the Great Plains. CONTENT: 1990 Clean Air Bill : its filure to address auto emissions / Scott Schlegel (3:09)| Attempts to clean the air…