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Predicting Aspergillus fumigatus exposure from composting facilities using a dispersion model: A conditional calibration and validation.

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journal contribution
posted on 28.03.2018, 09:28 by Philippa Douglas, Sean F. Tyrrel, Robert P. Kinnersley, Michael Whelan, Philip J. Longhurst, Anna L. Hansell, Kerry Walsh, Simon J. T. Pollard, Gillian H. Drew
Bioaerosols are released in elevated quantities from composting facilities and are associated with negative health effects, although dose-response relationships are unclear. Exposure levels are difficult to quantify as established sampling methods are costly, time-consuming and current data provide limited temporal and spatial information. Confidence in dispersion model outputs in this context would be advantageous to provide a more detailed exposure assessment. We present the calibration and validation of a recognised atmospheric dispersion model (ADMS) for bioaerosol exposure assessments. The model was calibrated by a trial and error optimisation of observed Aspergillus fumigatus concentrations at different locations around a composting site. Validation was performed using a second dataset of measured concentrations for a different site. The best fit between modelled and measured data was achieved when emissions were represented as a single area source, with a temperature of 29°C. Predicted bioaerosol concentrations were within an order of magnitude of measured values (1000-10,000CFU/m3) at the validation site, once minor adjustments were made to reflect local differences between the sites (r2>0.7 at 150, 300, 500 and 600m downwind of source). Results suggest that calibrated dispersion modelling can be applied to make reasonable predictions of bioaerosol exposures at multiple sites and may be used to inform site regulation and operational management.

Funding

This work was jointly funded by the EPSRC and the Environment Agency through an industrial CASE award (EPSRC CASE award EP/G501319/1), and partly funded by the National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Health Impact of Environmental Hazards at King’s College London in partnership with Public Health England (PHE) and collaboration with Imperial College London. The work of the UK Small Area Health Statistics Unit is funded by Public Health England as part of the MRC-PHE Centre for Environment and Health, funded also by the UK Medical Research Council.

History

Citation

International Journal of Hygiene and Environmental Health, 2017, 220 (1), pp. 17-28

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Physical Geography

Version

VoR (Version of Record)

Published in

International Journal of Hygiene and Environmental Health

Publisher

Elsevier for Urban and Fischer

issn

1438-4639

eissn

1618-131X

Acceptance date

20/09/2016

Copyright date

2016

Available date

28/03/2018

Publisher version

https://www.sciencedirect.com/science/article/pii/S1438463916303601?via=ihub

Language

en