June 2009
Front Matter
Training
18
Suggested
Analyses (2 of 4)
Prepare
box plots of concentrations by day of
week; compare results to expected patterns
of local emissions
Do
species show any day-of-week patterns?
Compare
monitor-level data to national-perspective
plots
How
do concentrations compare to other locations,
risk levels, remote background, or
reference concentrations?
Prepare
box plots of concentrations by season,
month, and time of day; compare to
national results and expectations based on local conditions
How
do these species vary by measurement
season, month, and time of day? Are findings consistent with national level results?
Determine
median concentrations and concentration
ranges and compare to appropriate
risk levels
What
are the most abundant air toxics at each
site on a risk-weighted basis?
What
is the nature and extent of air toxics problems in your area?
Example
Analyses
Questions