1. Duan, N . Models for human exposure to air pollution, Environ Int (1982) 8: 305–309
2. Johnson, T, Capel, J, McCoy, M, Mozier, J . Estimation of ozone exposures experienced by outdoor workers in nine urban areas using a probabilistic version of NEM. Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina April, 1996
3. Johnson, T, McCoy, M, Capel, J, Wijnberg, L, Ollison, W . A comparison of ten time/activity databases. Effects of geographic location, temperature, demographic group and diary recall method. In: Vostal J.J. (Ed.)Tropospheric ozone: nonattainment and design value issues. Proceedings of an International Specialty Conference, Boston, October 27–30, 1992. Air and Waste Management Association, Pittsburg, PA 1993
4. Klepeis, NE, Nelson, WC, Ott, WR, Robinson, JP, Tsang, AM, Switzer, P, Behar, JV, Hern, SC, Engelmann, WH . The national human activity pattern survey (NHAPS): a resource for assessing exposure to environmental pollutants, J Exposure Anal Environ Epidemiol (2001) 11: 231–252
5. Leech, JA, Wilby, K, McMullen, E, Laporte, K . Canadian human time–activity pattern survey report of methods and population surveyed, Chron Dis Can (1996) 17: 118–123