Toward a Balanced Strategy for Air Quality Control

The lingering uncertainties about the ability of the source control strategy alone to achieve and maintain the national ambient air quality standards in certain metropolitan areas argue strongly in favor of widening our options. A mixed abatement strategy, combining the progressive improvement of the technology of exhaust emission control with deliberate efforts to reduce the use of cars in the cities is proposed. The effectiveness and feasibility of various forms of vehicle restraints are examined.