== Overview ==
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This page is under construction.

In PALM-4U emissions can be applied in three different ways:

 • PARAMETERIZED: Traffic emissions are parameterized depending on the the values of street_type in the static file. Emission values for each street type and chemical compound must be supplied in the namelist as described below. No other emissions are considered. street_type can be obtained from OpenStreetMap.

 • DEFAULT: Gridded yearly emissions must be supplied by the user as specified in the PIDS document (see sample emissions file). Typical temporal variations are apllied by PALM4U.

 • PRE-PROCESSED: Preprocessed hourly (other temporal intervals will be possible in later versions) 3-d emission fields must be supplied by the user. 

Importantly, for the DEFAULT and the PRE-PROCESSED mode of the emissions, the exact date of the start of the simulation must be indicated through the namelist parameter date_init of the date_and_time_mod module. 

IMPORTANT: In the PRE-PROCESSED mode the initial date of the simulation has to coincide with the first day for which emission values are available. 

Find a more detailed description of the PALM-4U emission input in the corresponding attached document [https://palm.muk.uni-hannover.de/trac/attachment/wiki/doc/app/chempar/chem_emissions_PALM4U.pdf here].