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Assess concentration distributions;
compare concentrations to detection limits
Have data been censored?
Determine number of samples/species with
concentrations above detection
Are sufficient samples available for detailed
Review collocated data; inspect summary
statistics and concentration ranges; review
time series plots of concentrations and
Does suspect data quality appear in any
years or species measurements?
Run screening checks on data from AQS;
How have data been validated?
Are data of sufficient quality for analysis?