Step 3: Conduct the Assessment This step helps the  Handbook  users to set  up and conduct the air quality assessment.  This is accomplished through the  consideration of the following:   Action/Project Alternatives   Period(s) of Interest   Emission Sources and  Types of Pollutants  Necessary Input Data  [Hdbk. Pgs. 27 - 29]  Federal Aviation  Administration  19 FAA Air Quality Handbook Tutorial 