EPA Sends Final 'Appendix W' Air Modeling Guideline For OMB Review

September 6, 2016
EPA has sent its final rule revising its Clean Air Act “Appendix W” guideline on air quality computer modeling for White House Office of Management and Budget (OMB) pre-publication review, amid disagreement between industry, environmentalists and states over whether the changes will make make modeling more or less accurate. The highly technical rule, sent to OMB Sept. 2, provides EPA-recommended models and other techniques for use in predicting ambient concentrations of pollutants for controlling air pollution sources in programs “ranging...

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