Table A presents the assumptions used for the calculations in the wind distribution model (see Figure, p.13).
|Emissions from the store||Diffuse, through natural ventilation only|
|Average wind velocity||4 m/year|
|Concentration of pesticides in store||1 000 mg/m3|
|Emission rates||25; 12.5; 2.5 kg/h for open, moderately open and closed stores, respectively|
|Distribution model||Gaussic plume model (short term deposition)|
|Diameter pesticides particles||Moderately fine (80%d<4um; 17%4<d<10 um; 3% d>10 um)|
|Emission frequency||Every day throughout the year|
The model does have its limitations. The fact that the calculations are carried out for the worst-case parameters means that the maximum emission and maximum distance are calculated to the effect that the long-distance calculations will be overestimates, and the short-distance calculations will be underestimates.