‘Poetry and Smog’

A Times editorial (Jan. 2), “Poetry and Smog,” suggested that air quality experts need to resolve the ongoing controversy about the role of oxides of nitrogen (NOx) as both a promoter and inhibitor of ozone formation. I heartily agree with this position, and have urged the Air Resources Board to include an evaluation of this complex relationship in an coming Southern California Air Quality Study.

Recent studies, as well as the earlier work discussed in the editorial, support the conclusion that over-control of NOx can increase the amount of ozone formed in the South Coast Air Basin. Other studies are inconclusive on this issue. Thus, there is a controversy between scientists over whether further controls on NOx will help or harm the environment.

As you pointed out in your editorial, this should “force everybody involved in air chemistry back to the computer and the drawing board” in order to resolve the controversy. Until this relationship is fully understood, implementing new regulations for further NOx controls in California would not only be costly but possibly counterproductive.

The present NOx control program has reduced NOx levels in California much faster than anyone had anticipated, and, as new cars meeting the current standards replace older cars that don’t this trend will continue.

As a result, statewide attainment of the national ambient air quality standard for NO2 is predicted in 1987, if not sooner; and attainment of the state NO2 standard is expected a few years later. Thus, there is no compelling reason to accelerate the reduction in NOx until the scientists reach agreement over the role of NOx in ozone formation.

The Air Resources Board is coordinating the development of an extensive Southern California Air Quality Study; General Motors and others are actively participating in it. Data from this study could be used to resolve the NOx/ozone question. In the meantime, we believe the Air Resources Board should continue to place the emphasis on hydrocarbon control as the primary means to reduce ozone levels.

BETSY ANCKER-JOHNSON

Warren, Mich.

Ancker-Johnson is is a vice president with the environmental activities staff of General Motors.