models is restricted by lack of appropriate traffic count and speed
The emission inventory guidance document13 provides direction
for developing mobile-source inputs from original data (referred to
as a bottom/up method) or from an existing county-level inventory
(referred to as a top/down method).
Bottom/up methods are the preferred approach for estimating
vehicle activity levels and emission factors because these
methods have potential for resolving variations in speed and
vehicle miles traveled (VMT) among different grids over hourly
time slices. Bottom/up approaches are most appropriate for
addressing the inner urban core of modeling domains.
Peripheral, less dense traffic areas can be treated with
top/down methods. Exceptions to these recommendations should
be considered by the Technical Committee on a case-by-case
basis. Justification for more extensive use of top/down
methods should be sought in discussions with the appropriate
EPA Regional Office.
n1151 n1152 - n1153 - n1154 - n1155 - n1156 - n1157 - n1158 - n1159 - n1160 - n1161 - n1162 - n1163 - n1164 - n1165 - n1166 - n1167 - n1168 - n1169 - n1170 - n1171 - n1172 - n1173 - n1174 - n1175 - n1176 - n1177 - n1178 - n1179 - n1180 - n1181 - n1182 - n1183 - n1184 - n1185 - n1186 - n1187 - n1188 - n1189 - n1190 - n1191 - n1192 - n1193 - n1194 - n1195 - n1196 - n1197 - n1198 - n1199 - n1200
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castellano: DIS CUS DES RAD english: DIS CUS DES RAD
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