Different input formats in SMOKE have different emissions units. The SMOKE intermediate inventory file stores all annual emissions values from the IDA and SMOKE ORL format in tons/year. These two formats also support average-day emissions values, which are stored separately in the SMOKE intermediate inventory in tons/day. The average-weekday emissions values input from EMS-95 format are also stored in tons/year, but SMOKE sets an internal variable called TPFLAG so that later SMOKE processing steps can properly treat the computed “annual” value as an average-day value. The annual VMT data are stored as miles/year. In all cases, Smkinven converts the units of the input emissions to the units used in the SMOKE intermediate inventory. When this conversion involves a day-to-year conversion, Smkinven considers leap years by using 366 instead of 365 days in the year. See Section 8.2, “Inventory Files” for information about the units required for each inventory format.

When emissions are provided as average-day values from the IDA or SMOKE ORL formats and these emissions are then used in later processing steps, SMOKE does not further adjust the emissions using the monthly profiles. SMOKE assumes that the average-day emissions from these two formats have been adjusted to a specific month already. In addition, when Smkinven is configured using the FILL_ANNUAL option to fill in missing annual values using average-day values, Smkinven sets the TPFLAG internal variable to indicate that monthly adjustments should not be applied and that the “annual” emissions should just be divided by the number of days of the year before being used. Smkinven makes this setting on a source-by-source basis.