NYCDOH/ATSDR asbestos residential sampling results, Apr 2002

z z o o i 1^ co

o • Compare results to representative background.** • Compare results to representative background.** ■D c o CT o 155 • Identify meteorological conditions and factors such as • Review pre-sampling questionnaire responses. o' CJ> road traffic during sampling. • Evaluate multiple source contributions (WTC, "0 o 00 KJ • Use for evaluation of outdoor contribution to indoor outdoor, indoor activities cooking \clcaning,..). CJ> 03 concentrations • Assess ventilation systems (heating and cooling). O • Compare to DEC monitors • Recommend proper clean-up techniques be employed. o o c • Consider re-sampling and evaluate nearby 3 CD residences/common areas. 3

Inhalable Particulate 24 hour TSP

• Compare results to representative background.** • Compare results to representative background.** 250 • Identify meteorologic conditions, activities such as • Assess ventilation systems (heating and cooling). road traffic or construction activities during sampling. • Consider evaluating with modification to occupational • Assess the need for dust suppression procedures. standards. • Recommend proper clean-up techniques be employed. • Consider re-sampling after clean-up has occurred.

** As sampled in “Ambient and Indoor Sampling for Public Health Evaluations of Residential Areas Near WTC.” ' National Ambient Air Quality Standard (NAAQS) Total Suspended Particulates, New York State Ambient Air Quality Standard ’ The range of ratios reported in the 1996 and 2001 draft Ambient Air Criteria Documents for Indoor and Outdoor concentrations of PM 2.5 could be used to select a multiplier to be applied to the area level of concern. While estimates (from a limited number of studies) range from slightly less than one, to two (higher if smoking

41