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This report describes a study carried out in two parts. In the first part (A), measurements of dust and endotoxins in this dust were carried out at two houses for laying hens, two houses for broilers and two houses for fattening pigs. On the basis of these measurement data, the endotoxin concentrations were calculated in the vicinity of a number of fictitious farms in the second part (B). For this specific application, a variant of the New National Model was refined. The concentrations of dust and odour were also calculated for these farms using dispersion models prescribed for this purpose in environmental permit granting procedures. For each of the three components and for each of the fictitious farms, the distance was determined up to where the corresponding limit value is exceeded (the so-called exceedance distance). For endotoxins, the proposed limit value for endotoxins in the ambient air by the Dutch Health Council of 30 endotoxin units per cubic meter was applied. The calculations show that around poultry farms in the majority of modelled scenarios, the exceedance distance for endotoxins is greater than for dust and odour. Thus, around these farms, the existing assessment frameworks for fine dust and odour are not sufficient to provide the desired level of protection against endotoxins. Omslagfoto De foto op de voorzijde toont monstername van PM10 in de buitenlucht met op de achtergrond een veehouderijbedrijf. Foto: Kees Rutten. © 2016 Wageningen UR Livestock Research, Postbus 338, 6700 AH Wageningen, T 0317 48 39 53, E info.livestockresearch@wur.nl, www.wageningenUR.nl/livestockresearch. Livestock Research is onderdeel van Wageningen UR (University & Research Centre). Livestock Research aanvaardt geen aansprakelijkheid voor eventuele schade voortvloeiend uit het gebruik van de resultaten van dit onderzoek of de toepassing van de adviezen. Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd en/of openbaar gemaakt worden door middel van druk, fotokopie, microfilm of op welke wijze dan ook zonder voorafgaande toestemming van de uitgever of auteur. De certificering volgens ISO 9001 door DNV onderstreept ons kwaliteitsniveau. Op als onze onderzoeksopdrachten zijn de Algemene Voorwaarden van de Animal Sciences Group van toepassing. Deze zijn gedeponeerd bij de Arrondissementsrechtbank Zwolle. Livestock Research Rapport 959

Emissies van endotoxinen uit de veehouderij: emissiemetingen en verspreidingsmodellering = Emissions of endotoxins from animal production: emission measurements and dispersion modelling