1. ARB, California EPA Air Resources Board, 2001, Emission inventory data, Data base year 2001. 〈http://www.arb.ca.gov/ei/emissiondata.htm〉.
2. ARB, California EPA Air Resources Board, 2003. The 2003 California almanac of emissions and air quality 〈http://www.arb.ca.gov/aqd/almanac/almanac03/almanac03.htm〉.
3. ATSDR, Agency for Toxic Substances and Disease Registry, 1995. Toxicological profile for polycyclic aromatic hydrocarbons (PAHs) 〈http://www.atsdr.cdc.gov/toxprofiles/tp69.html〉.
4. ATSDR, Agency for Toxic Substances and Disease Registry, 2005. Toxicological profile for naphthalene, 1-methylnaphthalene, 2-methylnaphthalene 〈http://www.atsdr.cdc.gov/toxprofiles/tp67.html〉.
5. Bioconcentration of organic chemical vapours in plant leaves: the azalea model;Bacci;Chemosphere,1990