(b) Indicate whether data are actual measurements, engineering estimates, or theoretical or published values and whether the numbers are from a specific manufacturer or facility or whether they represent industry-average values. List a specific source if pertinent, e.g., obtained from Atlanta facility wastewater permit monitoring data.

(c) Indicate whether emissions are all available, regulated only, or selected. Designate data as to geographic specificity, e.g., North America, and indicate the period covered, e.g., average of monthly for 1991.

(d) List measures of data quality available for the data item, e.g.,

accuracy, precision, representativeness, consistency-checked, other, or none.

(e) Include nontraditional input, e.g., land use, when appropriate and necessary.

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