Input for air quality downscaling

What local data do I need to perform an air quality downscaling?

SUDPLAN Common Services allow the user to perform a downscaling model simulation over the city region of interest, reaching a spatial resolution of about 1x1 km. For further refinement, user’s own local models can be used.

An urban air quality downscaling is only meaningful if the user can provide local emission data with sufficient spatial resolution. The Common Services downscaling requires gridded emissions in the form of annual averages for six pollutants: NOx, NH3, PM, SO2, VOC and CO. The spatial resolution should preferably be 1x1 km or finer, so that the model simulation will not depend on the resolution of the emission input.

Minimum is to have one emission grid for each of the pollutants. If possible it is also desired to separate emissions at ground level from those coming out of point sources at certain height, typically 50 m or above. The model will then locate the emission grids at different heights.

There is a default time variation where ground level emissions vary according to a typical traffic pattern and where elevated grid emissions are constant over time. However, the SUDPLAN user may also input simple tables that change the time variation to be specific for the city. For each grid there is one table for hourly values during weekdays, Saturdays and Sundays, as well as a table for monthly variations (the values are treated as relative values, i.e. the variation is normalized to assure the correct annual average emission). Each set of emission grids are representing a particular year, e.g. 2010, 2030 or 2050.

The upload of emission needs only be made once, since the grids and time variation tables are stored in the Common Services for future use.
The format of the grids and the time variation tables can’t yet be given, since the user interface is not completed (it will likely be of the csv-type).