Air & Noise


The guidebooks below are for Air Specialists and Noise Specialists. They ensure that projects comply with laws and regulations related to air quality and transportation noise. The Clean Air Act and FHWA Procedures for Abatement of Highway Traffic Noise are the primary basis for these procedures. 

NOTE: Please be aware that some guidebooks are in development. As each guidebook is completed, it will be posted on this site. If a guidebook for your topic is not available, please visit the Archive Section.

 Guidebooks in Development

  • Noise – Public Involvement (an overview of public involvement requirements is in the Noise - Assessing Impacts guidebook, available now)


​The links below are frequently used sources referenced by the guidebooks.