Guidance - Air Quality

Guidance - Air Quality


ADOT's Current Air Quality Guidance is provided below and will be updated as new information becomes available. For information related to Metropolitan Planning Organizations (MPOs) requirements refer to "The ADOT, MPO, and COG Guidelines and Procedures Manual", which is, intended to be a resource document to assist in outlining the guidelines and procedures to conduct regional transportation planning functions including regional transportation conformity.

Current Guidance in use for Congestion Mitigation Air Quality can be found on the "Congestion Mitigation Air Quality / Transportation Control Measures" webpage.

Project-Level Conformity

Project-Level conformity determinations for Environmental Assessments (EA) or Environmental Impact Statements (EIS) will be posted to Projects and/or be available from ADOT NEPA staff. Project-Level conformity determinations for Categorical Exclusion (CE) classified projects will be posted to "Transportation Conformity" for projects approved after January 3, 2018.

For Project-Level Conformity Hot-Spot Analysis: Any new PM hot-spots needed after January 1, 2020, will be required to use the latest version of AERMOD, refer to the Training section of the “Project Development - Air Quality" website. Any non-Exempt Federal Projects in PM10, PM2.5 or CO maintenance and/or nonattainment areas are required to complete the following documents, as applicable, and submit to ADOT Air Quality Staff for further action and Interagency Consultation. The modeling and planning assumptions used for transportation conformity project level hot-spots require interagency consultation, ADOT utilizes the following documents for consultation:

  • Project Level CO Hot-Spot Analysis - Consultation Document - to be used in Phoenix CO Maintenance area, only.

Project Level PM Hot-Spot Analysis - to be used in PM10 and/or PM2.5 Nonattainment or Maintenance Areas

  • Project of Air Quality Concern Consultation Document - to determine if hot-spot modeling is needed.
  • Project Level PM Quantitative Hot-Spot Analysis Consultation Document - to be used when modeling is required.