NYC-WTC_000232959

NYC 9/11 Public Portal Document

Mineral Analyses in Air

Estimated levels of minerals in air for samples from 30 residential buildings (1-30) in lower Manhattan and 4 comparison residential buildings (31-34) above 59th Street are shown in the following table. The estimated air concentration of each mineral by size fraction is shown for each area sampled. Typically, samples were obtained from an outdoor area, an indoor common area, and two residences. In addition, co-located samples were obtained from some locations. However, due to inconsistencies during sample collection or analysis, the specific sampling location within the building is not noted.

Sample Building Particle Size Quartz Cristobalite Tridymite Calcite Portlandite Gypsum Mica Halite Volume Number Fraction (pg/m’) (pg'm’) (pg/m’) pg/m’) (pg'm’) (pg'm’) pg/m’) (pg/m’)) (L)

Summary of Comparison Areas Above 59th Street

PM 100 ND-3J

PM10 ND-3J

PM4 ND-5J

PM2.5 ND-3J

Results for Individual Buildings Sampled in Lower Manhattan (Buildings 1-30)

PM 100 882 6J

PM 100 830

PM 100 818

1 PM 100 892

PM10 861

PM10 835 7J

PM10 838 14 J

PM10 899 8J

PM4 809 84 J 10 J

PMK 813 12 J

1 PMI4 820 6J 68 J 10 J

1 PhM 837

2 PM 100 1229

2 PM 100 1162

2 PM 100 766

2 PM 100 1240

2 PM10 1194

2 PM10 1168

2 PM10 1390

2 PM10 1216

2 PhM 757 7J

2 PM4 717

2 PM4 849

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CITY_21MC100_011171552

NYC-WTC_000233083