E-mails 2002 M. Gilsenan

NYC 9/11 Public Portal Document

The results of indoor air and dust testing have not shown elevated levels of asbestos. Low levels of asbestos have been found in some indoor dust samples, but not at levels that exceeded regulatory standards. We are recommending that residents of lower Manhattan conduct frequent cleaning using wet methods.

• When will the final results of the ATSDR (Agency for Toxic Substances and Disease Registry) indoor air sampling be made available? What other substances besides asbestos and fiberglass are being analyzed? The final report on the indoor air sampling should be completed by April. Substances being analyzed in the air samples are asbestos, fibrous glass and particulate matter. Substances being analyzed in the dust samples include asbestos, fibrous glass, silica, mica, calcite, gypsum, and the pH of this material.

• For how many hours did the air sampiing occur in the DOH/ATSDR indoor air sampiing? Don’t particies and substances increase during the night hours? Air pumps operated until they had sampled a large enough volume of air to meet the criteria in the sampling methodology. Typically, this time period was from 5-8 hours. The focus of this project was indoor sampling. The levels of dust and fibers indoors are most affected by the activities inside a residence, not the time of day.

• Why is there no mention of heavy metais tested indoors? Outdoor monitoring around the WTC worksite and indoor sampling conducted in schools near the site have, in general, not found elevated levels of heavy metals. Thus they are not considered a priority substance to be tested indoors.

• Is lead still being tested indoors? Yes. Lead sampling is still being conducted, particularly in schools. In the rare instances that it has been discovered in schools, those areas have been thoroughly cleaned.

• What companies conduct indoor air and dust testing? Names of environmental consultant firms can be found in the yellow pages under “Environmental Consulting”. The city cannot endorse specific contractors so we are not recommending any specific firms.

• What standard is the DOH using to determine “acceptabie ieveis” for indoor air? How do you answer the charge from others that the standards being used are not protective of heaith, given the unique circumstances of the WTC coiiapse?

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