To live and breathe in L.A.

Reports how L.A. is asking its citizens to give up their cars, power tools, and even barbecuing in an effort to decrease the amount of smog in the area. First stages of clean-up; Goals; Severity of the problem; Strategy for clean-up; The costs of clean air. INSET: The dream machine (creating a `clean fuel' car), by K. Cobb..