This paper analyzes the reactive management approach used in the Las Vegas Valley to manage particulate matter (PM) pollution, demonstrates that system dynamics concepts can improve the current strategy, and proposes a more proactive approach to management.  Two decision support systems (DSS) were compared for this analysis: the current, linear proportional rollback model and a system dynamics model attempting to capture the essential feedback structure causing the problem.  A retroactive policy analysis, beginning in 1960, was performed to analyze the benefits and tradeoffs of a more proactive management strategy.  The analysis showed that including a system dynamics perspective does improve the validity of the model and the usefulness of the DSS for policy analysis.  Preliminary analysis shows that a proactive approach to management may lead to more effective policy options and greater flexibility in managing this problem but may have prohibitively high initial and/or sustained costs in some cases.