The Emission Database (EDB) is the crucial input for
dispersion modelling, but can also be used for emission estimations of
The user's login will set which databases the user can
access. This also opens for external users to use the I-Airviro system.
The map handling allows for the use of various maps on
any scale (zoom in/out and pan). This allows for a
stepwise development of the application once additional County Offices enter
into the project.
The map choice is followed by the choice to show the
source on the map and/or as a listing (edit mode). Then the source(s) can be
edited (added, changed, deleted) interactively.
The same principles are used for
point, line, area, and grid sources.
The Search Criteria allows for extraction of the data
from the EDB in various ways.
Printing of results uses
standard MS Windows functions.
The EDB in Estonia
The EDB for Estonia consists of several hundreds of
point sources, line sources (streets and roads), and area sources (like harbours).
The following screen dumps show some examples of how the EDB works:
Picture 1: The main point sources - with a pre-defined
minimum emission - are displayed on a map and as a listing.
Picture 2: To input the emission sources the map and/or coordinates can be
used. The picture shows some point sources in an industrial area in Tallinn.
Please note the big white spot which is the source used below.
Picture 3: The administrative information is given.
Picture 4: The technical information like compounds; stack height; emission
and emission variation (according to a scheme
"formula"); etc is given as parameters.
Picture 5: Using search criteria the user can
use practically any combination of criteria to retrieve information from the
EDB. The picture displays the search criteria NO2 for the whole
of Estonia. The result is displayed as dots for each source and the total
emission is calculated.
Picture 6: The same principles are used for
area and line source (roads/streets). The picture shows
the streets in central Tallinn (the white lines).
Picture 7: The roads/streets
are interactively chosen on the screen. The chosen road link is lit up and
ready for editing. New road links are added using the same principle.
This detailed screen dump is from Pärnu.
Picture 8: In order to make
as accurate emission estimates as possible, it is important to input
accurate information (data) about the source. For the road/street
information about the number of vehicles; type of street; number of lanes;
vehicle type distribution; etc.
As an interesting parallel and reference, the regional Air Quality
Management cooperation in the Stockholm Region has created one of the largest distributed EDBs
in the world (48 local authorities of various sizes). For a comprehensive presentation of the regional
cooperation in the Stockholm Region please download the
Adobe pdf presentation from the study visit at
and Health Protection Administration (SLB·analys)
on 22 March 2005.