Estimating separately personal exposure to ambient and nonambient particulate matter for epidemiology and risk assessment: why and how.

@article{Apte2001EstimatingSP,
  title={Estimating separately personal exposure to ambient and nonambient particulate matter for epidemiology and risk assessment: why and how.},
  author={Michael G. Apte and Allen S. Lefohn},
  journal={Journal of the Air & Waste Management Association},
  year={2001},
  volume={51 3},
  pages={322; author reply 329-38}
}