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The Clean Air Act (CAA), the National Environmental Policy Act (NEPA) and the Federal-Aid Highways Code regulate the potential effects caused by proposed transportation projects on air quality in Texas.

Use the following tools in conjunction with the Air Quality Environmental Handbook. In particular, the standard operating procedures (SOPs) describe the process for complying with the applicable laws, regulations and guidance in the environmental handbook. Use the Air Quality Standard of Uniformity to document project-level compliance with laws, regulations and guidance.

Questions? Contact the Air Quality Section of the Environmental Affairs Division at (512) 416-2659.

You may download the software (Tools and Plug-Ins) needed to access forms or view frequently asked questions (Online Forms FAQs).

Title Date Description Format
Summary of Air Quality Tools
05/14 A comparison of old guidance and new guidance in the Air Quality Toolkit
Environmental Handbook for Air Quality
02/14 Outlines the steps to comply with the CAA, NEPA and the Federal-Aid Highways Code in regards to potential project effects on air quality
Standard Operating Procedure for Complying with Conformity Requirements 02/14 Explains how to prepare and coordinate a conformity report
Review Standard for a Conformity Report 02/14 Verifies that a project-level conformity report meets requirements
Transportation Conformity Report Form 02/14 Prepares the Conformity Report
Standard Operating Procedure for Complying with Hot-Spot Requirements 02/14 Explains when and how to prepare and coordinate a hot-spot analysis technical report
Review Standard for a Hot-Spot Analysis Technical Report 02/14 Verifies that a Hot-Spot Analysis reports meet requirements
Documentation Standard for a Hot-Spot Analysis Technical Report 02/14 Lists the required sections and components of a Hot-Spot Analysis Technical Report
Hot-Spot Pre-Analysis Consensus Form 02/14 After an air quality concern has been identified, the project sponsor provides this form to the consultation partners during the initial conference call. The consultation partners use the data to decide whether the methodology and input parameters are appropriate.
Hot-Spot Analysis Data for a Consultation Partner
02/14 After a metropolitan planning organization (MPO) schedules a conference call, the project sponsor completes and sends this form to partners to determine whether the proposed project is "of air quality concern."
Air Quality Standards of Uniformity 03/13 Contains the applicable finding and negative declaration statements for documenting air quality compliance with applicable laws, regulations and guidance
Texas Air Quality Nonattainment or Attainment-Maintenance Areas and Counties – Sept. 6, 2013
06/14 Provides tabular information on nonattainment/maintenance counties and transportation plan conformity dates
Mobile Source Air Toxics (MSAT) Analysis Quick-Start Guide 02/14 Provides an overview of the quantitative MSAT emissions analysis process, cross-references to FHWA MSAT workshop material and outlines the analysis steps
The Missing MSAT – Diesel Particulate Matter
  Provides FHWA guidance on adding Diesel Particulate Matter (PM) to the MSAT analysis for MOBILE6.2
Emissions Table
06/14 Provides tabular MSAT emission rates, including carbon monoxide (CO), from 2013 through 2040

Additional Resources

Title Description Format
Air Quality Procedures for Civilian Airports and Air Force Bases Explains Federal Aviation Administration (FAA) air quality guidelines for civilian airports and air force bases where FAA is the lead federal agency
Determining Conformity of Federal Actions to State or Federal Implementation Plans (40 CFR 93) EPA-administered code implementing Section 176(c) of the CAA (42 USC 7401) and the related requirements of 23 USC 109(j) and establishing policy, criteria and procedures to demonstrate and ensure project conformity with an implementation plan developed pursuant to Section 110 and Part D of the CAA
Supplement to Jan. 28, 2008 Transportation Planning Requirements
Provides a detailed description of how transportation planning relates to the NEPA process (i.e., project-level consistency and conformity)
Transportation Conformity: A Basic Guide for State and Local Officials The FHWA provides a high-level overview of transportation conformity and how requirements relate to transportation investments and the implications on metropolitan transportation plans, transportation improvement programs and transportation projects
Transportation Conformity Brochure FHWA answers to basic questions about transportation conformity
Transportation Conformity Guidance for Qualitative Hot-Spot Analysis in PM2.5 and PM10 Nonattainment and Maintenance Areas Memorandum
FHWAprovides guidance for qualitative PM hot-spot analyses for projects of “air quality concern” in PM nonattainment/maintenance areas where a hot-spot analysis started prior to December 2012
Transportation Conformity Guidance for Quantitative Hot-Spot Analyses in PM2.5 and PM10 Nonattainment and Maintenance Areas EPA guidance for quantitative PM hot-spot analyses for projects of “air quality concern” in PM nonattainment/maintenance areas where a hot-spot analysis is started post December 2012
Guidelines for Modeling Carbon Monoxide from Roadway Intersections EPA guidance on how to model CO at roadway intersections for CO hot-spot analyses
Using MOVES (mobile vehicle emission simulator) in Project-Level Carbon Monoxide Analyses EPA guidance for using their MOVES emission model rather than the older MOBILE emissions model in CO hot-spot analyses where the analysis was started post December 2012
FHWA Technical Advisory for Preparing and Processing Environmental and Section 4(f) Documents T 6640A
FHWA guidance on preparing environmental documents outlining the requirements for performing a CO Texas Air Quality Analysis (TAQA) and disclosing construction emissions under NEPA
Interim Guidance Update on Mobile Source Air Toxic Analysis in NEPA Memorandum Provides an update to FHWA guidance on MSAT analyses
A Methodology for Evaluating Mobile Source Air Toxic Emissions Among Transportation Project Alternatives Detailed guidelines on performing quantitative MSAT analysis

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