Investigators suspected that Benzo(a)pyrene, or BaP, from a pipe foundry
in Phillipsburg, NJ, might be contaminating household air.  This dataset
presents data from 14 different days on samples of indoor air from
a house near the foundry and samples of outdoor air collected at the same
times.  The measures are concentrations of BaP-containing particles no
larger than 10 micrograms.

The two variables are:
   indoor air BaP
   outdoor air BaP

Reference: Lioy, PL, Walman, JM, Greenberg, A, Harkov, R and Pietarninen, C
(1988).  The total human environmental exposure study (THEES) to
Benzo(a)pyrene:  Comparison of the inhalation and food pathways.  Archives
of Environmental Health, 43: 304-312.