Indoor/outdoor ratios and indoor surface accumulations of ionic substances at Newark, New Jersey.

We previously reported deposition velocities for chloride, nitrate, sulfate, sodium, ammonium, potassium, magnesium, and calcium associated with fine and coarse particles at telephone company switching equipment locations in Wichita, Kansas and Lubbock, Texas. Preliminary data were also reported for a site in Newark, NJ. These results were based on comparisons of indoor concentrations, obtained using dichotomous samplers for collection and ion chromotography (IC) for analysis, with average annual surface accumulations that were obtained by collecting water extracts of zinc and aluminum structural surfaces and then analyzing by IC. In this paper we report the complete results for the Newark site. The deposition velocities are based on average annual surface accumulations derived from approximately 500 extractions of zinc and aluminum surfaces and indoor concentrations based on more than a year of sampling.