1. Develop a conceptual description of the problem to be addressed.
2. Develop a modeling/analysis protocol.
3. Select an appropriate model to support the demonstration.
4. Select appropriate meteorological time periods to model.
5. Choose an appropriate area to model with appropriate horizontal/vertical resolution
and establish the initial and boundary conditions that are suitable for the application.
6. Generate meteorological inputs to the air quality model.
7. Generate emissions inputs to the air quality model.
8. Run the air quality model with basecase emissions and evaluate the performance.
Perform diagnostic tests to improve the model, as necessary.
9. Perform future year modeling (including additional control strategies, if necessary) and
apply the attainment test.
Model applications require a substantial effort. States/Tribes should work closely with
the appropriate U.S. EPA Regional Office(s) in executing each step. This will increase the
likelihood of approval of the demonstration at the end of the process.
1.1 What Is The Purpose Of This Document?
This document has two purposes. The first is to explain how to interpret whether results
of modeling and other analyses support a conclusion that attainment of the ozone and/or PM2.5
NAAQS, and/or uniform rate of progress for regional haze will occur by the appropriate date for
an area. The second purpose is to describe how to apply an air quality model to produce results
needed to support an attainment demonstration or a uniform rate of progress analysis.
The guidance herein should be viewed as recommendations rather than requirements.
Although this guidance attempts to address issues that may arise in attainment demonstrations,
situations which we have failed to anticipate may occur. These should be resolved on a case by
case basis in concert with the appropriate U.S. EPA Regional Office.
1.2 Does The Guidance In This Document Apply To Me?
This guidance applies to all locations required to submit a State Implementation Plan
(SIP), or Tribal Implementation Plan (TIP) revision with an attainment demonstration designed
to achieve attainment of the ozone or PM2.5 NAAQS. The guidance also applies to SIPs
developed to address regional haze rule requirements. Areas required to submit an attainment
demonstration and/or a reasonable progress demonstration are encouraged to follow the
procedures described in this document. Details on when a State is required to submit a modeled
attainment or reasonable progress demonstration can be found in the regional haze rule4, the 8-
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