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Officials concede they can't defend Iowa clean air rules
Sioux City freeway will test need for pollution monitoring.
Pollution curb on city roads- 'clean air' rules affect 7 Iowa areas, enviro
Retreat on clean air.
Interstate Commerce Commission Chairman M. Van Nostrand asks Iowa air quali
Iowans study effects of air pollution on plants, Ames.
Governor Ray warns of head-on clash of Environmental Protection Agency, uti
Iowa odor law hit by cattlemen.
Fumes cause barren spot, Creston.
Order Colfax dump operator to discontinue open burnings.