INSTRUCTIONS:

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Question:

A factory emits formaldehyde into the atmosphere with a peak concentration in the surrounding community of 5.6 ug/m? a) What is the lifetime cancer risk to an average adult weighing 70 kg and breathing 20 mair/day. Assume the person is exposed to the peak concentration for an entire lifetime. Compare your findings to EPA acceptable lifetime risk level. b) Estimate the total number of expected additional cancers per year from inhalation of formaldehyde based on a population of 30,000 people. Compare the result to the average risk of cancer deaths in the United States (US cancer rate= 196/yr per 100,000 people). Assume an average lifetime of 70 years. Inhaled PF mg/kg-da)" 50.0 8.4 42 Table 14.3 Potency factor values for selected chemicals Substance Oral PF (mg/kg-da) Metals and Inorganics Arsenic 1.5 Beryllium 43 Cadmium Chromium VI Organic Compounds Benzene 5.5 X 102 Benzolla)pyrene (BaP) Chloroform 6.1 x 10 14 Dioxane 1.1 X 102 Formaldehyde Methylene chloride 7.5 x 10- Polychlorinated biphenyls (PCBs) 0.4 2.0 Tetrachloroethylene 52 x 10 Trichloroethylene (TCE) 1.1 X 10-2 7.3 29 x 10 3.10 8.1 X 102 45 x 10-2 1.65 x 10 0.4-2.0 20 x 10 6,0 x 10 Source: ORNL, 2000; USEPA, 1999