Addressed below are the following issues that arise in
developing emission input data: (1) use of speciation profiles,
(2) use of surrogate factors to grid area sources, (3) treatment of
mobile sources and top/down versus bottom/up approaches, (4)
episodic adjustment of inventories to day-specific modeling inputs,
(5) treatment of biogenic emissions, (6) cutoff levels for NOx
point sources, and (7) consistency with national inventories.
3.7.1 VOC speciation
The EPA provides "default" nationwide VOC speciation profiles
for various source category codes (SCCs).13 Use of local speciation
information, especially for major emitters, is preferable to
national default profiles. If feasible, major VOC point- and areasource
categories should be surveyed to determine appropriate VOC
composition profiles. In many cases, both the quantity and the
composition of emissions change as process operations are modified.
To the extent feasible, this should be accounted for when deriving
local speciation profiles and in simulating control strategies.
The emissions inventory guidance document13 provides details on
developing local speciation profiles.
Most current-year applications are likely to rely on existing
default data for speciating mobile-source emissions. Projected
future-year mobile-source emissions files may be based on different
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