Modelling Hazardous Reduction Burnings and Bushfire Emission in Air Quality Model and Their Impacts on Health in the Greater Metropolitan Region of Sydney

Abstract

Modelling and forecasting of air pollution from bushfires or hazardous reduction burnings is important in providing information and allowing measures to be taken to reduce the exposure of people from harmful effect of air pollutants from fire events. In this work, the meteorological, chemical transport model and air quality models developed by the Commonwealth Scientific and Industrial Research Organisation of Australia are used in conjunction with the smoke emission model to simulate the formation and dispersion of particle aerosols (PM2.5) in the Greater Metropolitan Region of Sydney as the results of emission of different pollutant species from hazardous reduction burnings or from bushfires. The smoke emission model is based on a fire model describing two distinct fire behaviours: flaming and smothering. There are several schemes that can be used to estimate the emission factors of different emitted species from fire of various vegetation types. A comparison of these schemes is performed by comparing the air quality model output from air quality model with observation from monitoring stations in a case study, the May 2016 prescribed burning winter period, which caused elevated particle concentrations in the Sydney basin. The PM2.5 prediction over the Greater Metropolitan Region of Sydney from the forecasting modelling tool will then be used to calculate the population exposure and health impacts due to the May 2016 fire event as a case study. The three main health endpoints considered for health impacts are mortality, respiratory-related and cardiovascular hospitalisations. The results are comparable with other studies using non-modelling methods of determining the exposure and health impacts on this event.

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Acknowledgements

The authors would like to thank Ivan Hannigan and Joshua Horsley of the University of Sydney for providing the software facility to calculate health impact used in this study.

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Correspondence to Hiep Duc Nguyen.

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Appendices

Appendix 1. Emission factors (EF) for flaming and smouldering of Carbon Bond 5 (CB5) mechanism species and the 2-bin CTM aerosol module

Table 6 Emission factors of CB5 species from Lawson et al. [29] (CSIRO) scheme, Andreae-Merlet (2001) and Andreae-Merlet (2001) and DELWP schemes

Appendix 2

Predicted cardiac and respiratory hospitalisation in each SA4 census district in the GMR due to the 5 to 9 May 2016 event

Fig. 18
figure18

Cardiac hospitalisation in each SA4 census district in the GMR due to fire event causing elevated PM2.5 for the period 5 to 9 May 2016

Fig. 19
figure19

Respiratory disease hospitalisation in each SA4 census district in the GMR due to fire event causing elevated PM2.5 for the period 5 to 9 May 2016

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Nguyen, H.D., Trieu, T., Cope, M. et al. Modelling Hazardous Reduction Burnings and Bushfire Emission in Air Quality Model and Their Impacts on Health in the Greater Metropolitan Region of Sydney. Environ Model Assess 25, 705–730 (2020). https://doi.org/10.1007/s10666-020-09705-x

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Keywords

  • Hazardous reduction burnings (HRB)
  • Smoke emission
  • CCAM-CTM air quality model
  • Smoke aerosols
  • Air quality health impact