June 2009
Front Matter
Training
14
Types of Questions Analysts May Want to Consider
•How do I ensure that the data I plan to use for analysis are of good quality?
–Preparing Data for Analysis, Section 4
•How do air toxics concentrations change spatially and by time of day, day of week, and season? 
–Characterizing Air Toxics, Section 5 and Background, Section 3
•What are the most important air toxics in terms of potential risk? 
–Advanced Analyses, Section 7
•How do concentration levels for a given city/area compare to other cities?
–Characterizing Air Toxics, Section 5
•Have air toxics concentrations declined over time in response to emission control programs?
–Quantifying and Interpreting Trends in Air Toxics, Section 8
•How do the most important air toxics compare with model output (e.g., are ambient concentrations high in locations not shown by the model)?
–Characterizing Air Toxics, Section 5
How do I ensure that the data I plan to use for analysis are of good quality?
How do I treat data below detection?  What kinds of data metrics do I need for subsequent analyses?  (See Preparing Data for Analysis, Section 4)
How do air toxics concentrations change spatially and by time of day, day of week, and season?
Which air toxics have similar patterns?  (See Characterizing Air Toxics, Section 5)
Do these air toxics have common sources?  (See Background, Section 3)
What are the most important air toxics in terms of potential risk?
Are we measuring them and, if so, are we measuring them well?  Where are they important?
Which pollutants are not monitored well enough to characterize their risk or hazard?  (See Advanced Analyses, Section 7)
How do concentration levels for a given city/area compare to other cities?
Are concentrations comparable?  What is the variability of air toxics concentrations within cities? Do specific cities, states, or regions experience demonstrably higher or lower concentrations?  Do rural and remote sites show demonstrably lower concentrations?  Are there differences in concentrations associated with geo-political or agency differences?  (See Characterizing Air Toxics, Section 5)
Have air toxics concentrations declined over time in response to emission control programs?  (See Quantifying and Interpreting Trends in Air Toxics, Section 8)
How do the most important air toxics compare with model output (e.g., are ambient concentrations high in locations not shown by the model)?  (See Characterizing Air Toxics, Section 5)