EPA’s 1-hour NO2 standard is low enough to potentially cause problems, and they require near-road monitoring to determine attainment.  What are the best methods for modeling roadway and rail (non-electric) NO2 microscale impacts?  What are the available and appropriate models?  For suitable models, provide step-by-step instructions for use.  Needed for short-term use in environmental documents and longer-term use in assisting EPA with developing workable hot-spot analysis
procedures.